FIELD

The present disclosure relates to a coating composition. Particularly, the present disclosure relates to a blue cathodic electrodeposition (CED) coating composition.

DEFINITION

As used in the present disclosure, the following term is generally intended to have the meaning as set forth below, except to the extent that the context in which it is used indicate otherwise.

Cathodic Electro Deposition (CED) - refers to a process of coating an object having a conductive surface connected to a circuit as the cathode, by positively charged paint particles suspended in aqueous medium, under direct current.

BACKGROUND

The background information herein below relates to the present disclosure but is not necessarily prior art.

Electro-deposition of primer coating has become universal and is widely used for a modern automotive paint industry. In electrodeposition (ED), charged particles from the paint emulsion move to Anode (AED) or Cathode (CED) under electrical forces. The direct current established through the bath makes the pigment and resin base of the paint, wander towards the body surfaces. Coating reaches all the recessed area. One of the major advantages of electrocoat processes is that, the applied film forms a uniform layer over a variety of metallic substrates regardless of shape and configuration.

E-coat (Electro-deposition coat) is a dip wet paint coating process that provides excellent corrosion resistance and provides a protective paint layer when applied to an automotive body. During the E-coat paint process, an entire automotive body is immersed in a liquid bath. By applying an electrical current, a thin paint film forms over all the surfaces which are in contact with the liquid, including those surfaces in recessed portions of the body. The E- coat paint process deposits a thin paint film on the automotive body under the influence of a voltage gradient of about 100 to 300 volts. The water-based E-coat paint bath is conductive with an array of anodes that extends into the bath delivering a DC current. The so obtained paint film has enhanced physical properties that resist corrosion (appear only after the automotive body has been cured in an oven).

E-coat processes can either be Anodic or Cathodic depending on the polarity of the charge. In anodic systems, the part is the anode which is positively charged, and attracts the negatively charged paint particles in the bath. Anodic E-coat is supplied as one component system. This process is not widely used due to less corrosion resistance and durability. In Cathodic systems, the part is negatively charged, which attracts the positively charged paint particles. Cathodic e-coat is supplied as two component system, i.e., pigment paste as one component and resin emulsion as a second component. Conventionally, E-coat bath is prepared by mixing pigment paste and resin emulsion in a ratio of 1: 3.5 ± 0.5 which is diluted by addition of deionized water so as to adjust the solids of the E-coat bath in the range of 15 ± 3 % depending on the dimension and geometry of the part. Organic acid is added to the bath to adjust the pH of the bath in the range of 5.6 ± 0.3.

Conventional CED coating composition contains water, monobasic acid, organic, organometallic and inorganic pigments, a cathodically depositable binders having functional groups comprising active hydrogen, for example hydroxyl groups, primary and/or secondary amino groups and blocked poly isocyantes as the crosslinking agents (curing agents). Currently, the majority of CED coatings used by automobile and its ancillaries are grey or black color only, and some customers use yellow, green, red Epoxy CED, which restricts the various colored epoxy CED composition.

Thus, there is felt a need to provide a coating composition which mitigates the drawbacks mentioned herein above.

OBJECTS

Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:

An object of the present disclosure is to ameliorate one or more problems of the prior art or to at least provide a useful alternative.

Another object of the present disclosure is to provide a coating composition.

Still another object of the present disclosure is to provide a cathodic electrodeposition (CED) coating composition. Another object of the present disclosure is to provide a cathodic electrodeposition (CED) coating composition that is in blue shade/color.

Still another object of the present disclosure is to provide a blue cathodic electrodeposition (CED) coating composition that reduces the consumption of top coat paints.

Yet another object of the present disclosure is to provide a cathodic electrodeposition (CED) coating composition that is stable, has consistency in shade/color and does not flocculate.

Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.

SUMMARY

The present disclosure relates to a blue cathodic electrodeposition (CED) coating composition comprising a cathodic electrodeposition pigment paste and a resin emulsion. The epoxy cathodic electrodeposition pigment paste comprises at least one anti- settling agent in an amount in the range of 0.1 to 1.5 wt%, at least one dispersing agent in an amount in the range of 15 to 25 wt%, at least one wetting agent in an amount in the range of 1 to 2 wt%, pigment blue in an amount in the range of 5 to 15 wt%, at least one filler in an amount in the range of 10 to 40 wt%, at least one surfactant in an amount in the range of 0.1 to 1.5 wt%, at least one catalyst in an amount in the range of 2 to 10 wt%, at least one anti-corrosive pigment in an amount in the range of 1 to 10% and q. s. fluid medium. The weight % of each of the component is with respect to the total weight of the pigment paste.

The present disclosure further provides a process for preparation of the cathodic electrodeposition (CED) pigment paste. The process comprises mixing predetermined amounts of at least one anti-settling agent and a first fluid medium under stirring at a first predetermined speed followed by cooling to a temperature in the range of 10°C to 30°C to obtain a first pre-mixed slurry. Predetermined amounts of at least one dispersing agent, at least one wetting agent and at least one surfactant are added to the first pre-mixed slurry under stirring at a second predetermined speed to obtain a second pre-mixed slurry. Thereafter, predetermined amounts of blue pigment and at least one catalyst are added to the second pre-mixed slurry under stirring for a first predetermined time period to obtain a third pre-mixed slurry. Then predetermined amounts of at least one filler and at least one anticorrosive pigment are added to the third pre-mixed slurry under stirring for a second predetermined time period to obtain a homogeneous mixture.

The homogeneous mixture is then ground at a temperature in the range of 10°C to 30°C to obtain a resultant mixture having a particle size in the range of 1m to 15m. The resultant mixture is then thinned with a second fluid medium to obtain the cathodic electrodeposition (CED) pigment paste. The cathodic electrodeposition (CED) pigment paste is used in preparation of cathodic electrodeposition (CED) coating composition.

DETAILED DESCRIPTION

Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.

The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.

CED coating compositions currently employed contains water, monobasic acid, organic, organometallic and inorganic pigments, a cathodically depositable binders having functional groups comprising active hydrogen, for example hydroxyl groups, primary and/or secondary amino groups and blocked poly isocyantes as the crosslinking agents (curing agents). Currently, the majority of CED coatings used by auto and its ancillaries are grey or black color only, and some customers use yellow, green, red Epoxy CED, which restricts the use of other colored epoxy CED composition.

There is always a challenge for developing blue shade epoxy CED composition, as it is not very stable and has difficulty in consistency. Further, E-coat process consist various components coated on line which is having different shape, size, weight and thickness. Since baking oven is common, these components will attain varying EMT (Effective Metal temperature) and hence there will be variation in shade from component to component.

In a first aspect of the present disclosure, there is provided a blue cathodic electrodeposition (CED) coating composition.

In accordance with the present disclosure, the blue CED coating composition comprises an epoxy cathodic electrodeposition pigment paste and a resin emulsion. The epoxy cathodic electrodeposition pigment paste comprises at least one anti-settling agent in an amount in the range of 0.1 to 1.5 wt% with respect of the total weight of the pigment paste; at least one dispersing agent in an amount in the range of 15 to 25 wt% with respect of the total weight of the pigment paste; at least one wetting agent in an amount in the range of 1 to 2 wt% with respect of the total weight of the pigment paste; pigment blue in an amount in the range of 5 to 15 wt% with respect of the total weight of the pigment paste; at least one filler in an amount in the range of 10 to 40 wt% with respect of the total weight of the pigment paste; at least one surfactant in an amount in the range of 0.1 to 1.5 wt% with respect of the total weight of the pigment paste; at least one catalyst in an amount in the range of 2 to 10 wt% with respect of the total weight of the pigment paste; at least one anti-corrosive pigment in an amount in the range of 1 to 10 wt% with respect of the total weight of the pigment paste; and q. s. fluid medium.

In accordance with an embodiment of the present disclosure, the anti-settling agent is at least one selected from the group consisting of wax, urethane-modified polyether (epoxy extension with isocyanate moiety to form an urethane modified polyether), acrylic polymers, hydrophilic silica and xanthan gum.

In accordance with the present disclosure, wax is selected from microcrystalline cellulose, maltrodextrin, xanthan gum and combination thereof. In an exemplary embodiment, the anti settling agent is a mixture of microcrystalline cellulose, maltrodextrin and xanthan gum. In accordance with an embodiment of the present disclosure, the dispersing agent is at least one selected from the group consisting of epoxy resin (having a molecular weight of 3000 g/mol), aliphatic amine salts, quaternary ammonium salt, aliphatic alcohol sulfate, alkyl sulfonate, poly-oxy-ethylene alkyl ether, sorbitan esters, and fluorine surfactant. In an embodiment, the dispersing agent is a resin with quaternary ammonium salt used in pigment for dispersion. In an exemplary embodiment, the dispersing agent is epoxy resin.

In an embodiment of the present disclosure, the wetting agent is at least one selected from the group consisting of intermediate epoxy resin (having a molecular weight of 1250 g/mol), acetylene tertiary alcohol, alkylamine, and amide. In an embodiment, the wetting agent is a resin with quaternary ammonium salt used for pigment wetting. In an exemplary embodiment, the wetting agent is an intermediate epoxy resin.

In accordance with the present disclosure, the pigment blue is beta copper phthalocyanine. The pigment blue imparts blue color to the composition.

In accordance with the embodiments of the present disclosure, the filler is at least one selected from the group consisting of clay and titanium dioxide (Ti(¾). The clay is at least one selected from the group consisting of china clay, calcined clay, naturally occurring anhydrous clay and hydrous clay, and hydrated aluminium silicate.

In an exemplary embodiment the filler is china clay and the amount of china clay is 9.7 wt%. In another exemplary embodiment the filler is Ti(¾ and the amount of Ti(¾ is 9.3 wt%. In still another exemplary embodiment, the filler is a combination of clay and Ti(¾ and the amount of the combination of china clay and Ti(¾ is 19 wt%. The filler used in the composition of the present disclosure can also be used as extenders and provides better opacity to the composition.

In accordance with the embodiments of the present disclosure, the surfactant is an anionic surfactant. In an embodiment, the anionic surfactant is selected from the group consisting of polyoxyalkylene styrenated phenyl ether sulfate, polyoxyalkylene styrenated phenyl ether phosphate, polyoxyalkylene styrenated phenyl ether carboxylate, polyoxyalkylene styrenated phenyl ether sulfosuccinate, polyoxyalkylene alkyl ether sulfate, polyoxyalkylene alkyl ether phosphate, polyoxyalkylene alkyl ether carboxylate, polyoxyalkylene alkyl ether sulfosuccinate, polyoxyalkylene alkenyl ether sulfate, polyoxyalkylene alkenyl ether phosphate, polyoxyalkylene alkenyl ether carboxylate, polyoxyalkylene alkenyl ether sulfosuccinate, polyoxyalkylene styrenated propenylphenyl ether sulfate, polyoxyalkylene styrenated propenylphenyl ether phosphate, polyoxyalkylene styrenated propenylphenyl ether carboxylate, polyoxyalkylene styrenated propenylphenyl ether sulfosuccinate, polyoxyalkylene alkylpropenylphenyl ether sulfate, polyoxyalkylene alkylpropenylphenyl ether phosphate, polyoxyalkylene alkylpropenylphenyl ether carboxylate, polyoxyalkylene alkylpropenylphenyl ether sulfosuccinate and polyoxyethylene styrenated phenyl ether. In an exemplary embodiment, the surfactant is polyoxyethylene styrenated phenyl ether. The surfactant used in the present disclosure imparts better wetting capacity and stability to the composition.

In accordance with the embodiments of the present disclosure, the catalyst is at least one selected from a tin precursor and a bismuth precursor. In an embodiment, the tin precursor is selected from Dioctyl Tin Oxide (DOTO), Dibutyltin Oxide (DBTO), Tetrabutyl Titanate (TBT), Dibutyltin Benzoate, and bismuth precursor is bismuth hydroxide (BiOtT).

In an exemplary embodiment, the catalyst is precursor of tin and the amount of tin precursor is 3.64 wt%. In another exemplary embodiment, the catalyst is precursor of bismuth and the amount of bismuth precursor is 3.64 wt%. In still another exemplary embodiment, the catalyst is a combination of precursor of tin and bismuth and the amount of the combination of tin and bismuth precursor is 7.28 wt%. The catalyst used in the present disclosure is used for curing the composition.

In accordance with the embodiments of the present disclosure, the anti-corrosive pigment is at least one selected from aluminum triphosphate and magnesium zinc aluminum hydroxide.

In an exemplary embodiment, the anti-corrosive pigment is aluminum triphosphate and the amount of aluminum triphosphate is 0.87 wt%. In another embodiment, the anti-corrosive pigment is magnesium zinc aluminum hydroxide and the amount of magnesium zinc aluminum hydroxide is 0.87 wt%. In still another embodiment, the anti-corrosive pigment is a combination of aluminum triphosphate and magnesium zinc aluminum hydroxide and the amount of the combination of aluminum triphosphate and magnesium zinc aluminum hydroxide is 1.74 wt%. The anti-corrosive pigment used in the present disclosure is used to resist the corrosion.

In accordance with the embodiments of the present disclosure, the fluid medium is water. The amount of fluid medium is q. s. Water is ultra-violet (UV) radiation treated water, deionized water (DI) or water obtained by reverse osmosis treatment. In an embodiment of the present disclosure, the fluid medium is deionized water.

In the present disclosure, in cathodic electrodeposition coating composition, conventional composition of resin emulsion (F-2) is used. In an exemplary embodiment, the resin emulsion is an epoxy modified emulsion polymer (EM-950).

In accordance with an embodiment of the present disclosure, a weight ratio of the epoxy cathodic electrodeposition pigment paste to the resin emulsion is in the range of 1:2 to 1:5. In another embodiment, the weight ratio of the epoxy cathodic electrodeposition pigment paste to the resin emulsion is in the range of 1:3 to 1:4.5. In an exemplary embodiment, the ratio of the epoxy cathodic electrodeposition pigment paste to the resin emulsion is 1:3.76.

In an embodiment, of the present disclosure, the blue epoxy CED pigment paste has the following composition (F-l): Table 1: Blue epoxy CED pigment paste in accordance with the present disclosure:

In an exemplary embodiment, the epoxy cathodic electrodeposition pigment paste (F-l) comprises an anti-settling agent in 0.45 wt%, dispersing agent in 21.90 wt%, wetting agent in 0.87 wt% , pigment blue in 7.70 wt%, filler in 19.0 wt%, surfactant in 0.4 wt%, catalyst in 7.28 wt%, anti-corrosive pigment in 1.74 wt% and q. s. fluid medium. The weight % of each of the component is with respect to the total weight of the pigment paste.

The present disclosure provides pigment paste (F-l) which does not flocculate, provides consistent shade/color, ease in grinding of pigment, and stable.

The blue CED composition of the present disclosure has blue shade/color and when the blue CED composition of the present disclosure is applied on the surface, the consumption of top coat paints is reduced for the following reasons: a) being same shade the top coat will have better coverage; b) for interior parts which are not exposed to weather, top coat application is not required.

In a second aspect of the present disclosure, there is provided a process for the preparation of the cathodic electrodeposition pigment paste. The process is described in details as follows:

In a pre-mixer, predetermined amounts of at least one anti-settling agent and a first fluid medium are mixed by stirring at a first predetermined speed followed by cooling to a temperature in the range of 10°C to 30°C to obtain a first pre-mixed slurry.

In an embodiment of the present disclosure, the first predetermined speed is in the range of 400 to 600 rpm. In an exemplary embodiment, the first predetermined speed is 500 rpm.

In the next step, predetermined amounts of at least one dispersing agent, at least one wetting agent and at least one surfactant are added to the first pre-mixed slurry under stirring at a second predetermined speed to obtain a second pre-mixed slurry. If lump formation is observed, the slurry is further agitated.

In an embodiment of the present disclosure, the second predetermined speed is in the range of 800 to 1000 rpm. In an exemplary embodiment, the second predetermined speed is 900 rpm.

Thereafter, predetermined amounts of blue pigment and at least one catalyst are added to the second pre-mixed slurry followed by agitating for a first predetermined time period to obtain a third pre-mixed slurry.

In an embodiment of the present disclosure, the first predetermined time period is in the range of 20 to 50 minutes. In an exemplary embodiment, the first predetermined time period is 30 minutes.

Then predetermined amounts of at least one filler and at least one anticorrosive pigment are added to the third pre-mixed slurry under agitation for a second predetermined time period to obtain a homogeneous mixture and avoid lump formation.

In an embodiment of the present disclosure, the second predetermined time period is in the range of 20 to 50 minutes. In an exemplary embodiment, the second predetermined time period is 30 minutes. The homogeneous mixture is then ground at a temperature in the range of 10°C to 30°C to obtain a resultant mixture having a particle size in the range of 1m to 15m. Fineness is checked after each pass. The premix slurry is ground for 4-6 passes until a predetermined fineness is attained. The resultant slurry is then collected in a thinning mixer. The resultant mixture is then thinned with a second fluid medium to obtain the cathodic electrodeposition (CED) pigment paste.

In an embodiment, the agitation speed is in the range of 400 to 600 rpm and the agitation time is in the range of 7 to 15 minutes. The samples of the slurry are tested and filled through a 10 micron filter in barrels or storage tanks.

In the process of the present disclosure for preparing the CED pigment paste, the components of the pigment paste are added in a stepwise manner so as to avoid any lump formation and thereby achieving a homogeneous pigment paste. The homogeneous pigment paste when used in the CED coating composition, results in a paint that is stable, consistent in shade/ colour, has a smooth appearance, and does not flocculate when applied on surfaces. If the stepwise addition pattern or the specific sequence of addition of the components is not followed, there would be formation of lumps in the pigment paste which would ultimately lead to non-uniform coating i.e., number of bits (coarse particulates appearing on the coating) of the coating will be higher which is not desirable. Further, the present disclosure provides an electrodeposition (ED) bath dilution formula comprising predetermined amounts of the blue CED pigment paste, resin emulsion, acetic acid and q. s. water.

In an embodiment, the electrodeposition (ED) bath dilution formula comprises the following:

Table 2- ED bath dilution formula:

In an embodiment of the present disclosure, there is provided a process for the preparation of the electrodeposition (ED) bath. The process is described in details as follows:

The resin emulsion F-2 and blue pigment paste F-l are mixed in the ratios as mentioned in Table 2 to form a cathodic electrodeposition (ED) coating composition. The composition is then diluted with water. In the next step, acetic acid is added and agitated for a time period of 24 to 48 hours. The coating is performed in a rectifier. Rectifier is an equipment that converts alternating current (AC) to direct current (DC). This set-up is used for electrodeposition of the CED coating composition on the surface.

The present disclosure provides a blue cathodic electrodeposition (CED) coating composition comprising a cathodic electrodeposition pigment paste and a resin emulsion and process for its preparation. The coating composition of the present disclosure does not flocculate, provides a consistent shade/color, ease in grinding of pigment, and is stable.

The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment but are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.

The present disclosure is further described in light of the following experiments which are set forth for illustration purpose only and not to be construed for limiting the scope of the disclosure. The following experiments can be tested to scale up to industrial/commercial scale and the results obtained can be extrapolated to the industrial scale.

EXPERIMENTAL DETAILS:

Example 1: Preparation of blue cathodic electrodeposition (CED) coating composition: In a pre-mixer, predetermined amount of anti-settling agent was mixed in DI water and stirred at 500 rpm for 30 minutes to avoid foaming and cooled to 20°C to obtain a first pre mixed slurry. Thereafter, predetermined amounts of dispersing agent and wetting agent was added to first pre-mixed slurry under stirring at a speed of 900 rpm for a period of 30 minutes to obtain a second pre-mixed slurry. Further, a predetermined amount of pigment blue and a catalyst were added and further agitated for a time period of 30 minutes to obtain a third pre mixed slurry, such that there were no lumps formed. Later, predetermined amounts of clay and an anticorrosive pigment were added under mixing to obtain a homogeneous mixture. The mixture was further agitated for 30 minutes after addition of all ingredients to form homogenous mixture and avoid lump formation. The homogeneous mixture was then ground at 20°C to obtain a ground mixture having a particle size in the range of 1m to 15m. The ground slurry was then collected in a thinning mixer and was thinned by adding deionized (DI) water to obtain cathodic electrodeposition (CED) pigment paste.

The above pigment paste was mixed with resin emulsion to form the CED coating composition. The electrodeposition bath dilution formulation was prepared in a container in accordance with Table 3a and was coated on a surface.

Table 3a: ED bath dilution formula:

Following results were obtained:

Table 3b: Shade stability after ED bath ageing studied @ 18 ~ 20 m DFT.

* L: Lightness, A: red/green value and B: blue/yellow value

Inference: Based on data provided in Table 3b no much variation was observed in blue shade or tone.

The color tone panel was tested for the anticorrosive performance and other physical film properties. The tested color tone panel was offered to the tractor customer. The customer was able to achieve 10 to 15% reduction in top coat consumption due to elimination of top coat application in interior parts of the tractors. Examples 2- 4: To study paint properties by varying the amount of anti-settling agents in the CED coating composition.

Same experimental procedure was followed as described in example- 1, except that respective percentages of various components used were as given in Table 4b, wherein the quantity of anti-settling agent was varied as provided in table 4a. The quantity of anti-settling agent was varied as follows:

Table 4a- Amount of anti-settling agents for examples 2-4:

Table 4b- Composition in accordance with examples 2-4:

The electrodeposition bath dilution formulation was prepared in a container accordance with Table 2 and was kept still for 72 hours. After 72 hours, the formulation was agitated and coated on a surface with 1 minute interval and 2 minutes of coating. Following results were obtained:

Table 5- Results due to variation in the amount of anti-settling agents for examples 2-4:

Inference:

From Table 5, it is clearly observed that if the quantity of anti-settling agent is below the specified limit, the settling tendency is more i.e., in case of Example 2, the number of bits (particulates appearing on the coating) is comparatively very high and hence, the paint would not have a smooth appearance. If the quantity of anti-settling agent is more than the specified limit, no significant improvement in the coating is achieved.

Examples 5-6: To study the paint properties by varying the amount of pigment blue in the CED coating composition. Examples 5: Same experimental procedure was followed as described in example-1, except that respective percentages of various components used were as given in Table 6, wherein the quantity of pigment blue used was < 5 wt%.

Table 6 - Composition in accordance with example 5:

Table 7: Shade stability after ED bath ageing studied @ 18 ~ 20 m DFT.

* L: Lightness. A: red/green value and B: blue/vellow value

Inference: Based on above data variation was observed in blue shade or tone. Hence, the coating composition was not stable and consistent, especially with blue shade/colour.

Examples 6: Same experimental procedure was followed as described in example- 1, except that respective percentages of various components used were as given in Table 8, wherein the quantity of pigment blue used was >15.1. Table 8 - Composition in accordance with example 6:

Table 9: Shade stability after ED bath ageing studied @ 18 ~ 20 m DFT.

* L: Lightness, A: red/green value and B: blue/yellow value Inference:

Based on above data, variation was observed in blue shade or tone. Hence, the coating composition was not stable and consistent, especially with blue shade/colour.

Examples 7: Preparation of test surface to study the characteristics of the ED film.

Electrodeposition bath dilution formulation was prepared in accordance with the composition as disclosed in Table 3a and the bath was prepared in an open container at 240 rpm at 30°C water bath for 40 hours. The coating was performed in a rectifier. The characteristics of the ED film observed after completion of ageing test are provided in Table 10.

Table 10: Experiment details for preparation of test surface:

* L: Lightness. A: red/green value and B: blue/vellow value

Based on above data not much variation was observed in blue shade or tone. Hence, the coating composition was stable and consistent, especially with blue shade/colour. TECHNICAL ADVANCEMENTS The present disclosure described herein above has several technical advantages including, but not limited to, the realization of, a blue cathodic electrodeposition (CED) coating composition that is:

• stable;

• provides consistency in shade/color;

• reduces the consumption of top coat paint; and

• does not flocculate when applied on the surface.

The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

The foregoing description of the specific embodiments so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising, will be understood to imply the inclusion of a stated element, integer or step,” or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps. The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the invention to achieve one or more of the desired objects or results. While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Variations or modifications to the formulation of this invention, within the scope of the invention, may occur to those skilled in the art upon reviewing the disclosure herein. Such variations or modifications are well within the spirit of this invention.

The numerical values given for various physical parameters, dimensions and quantities are only approximate values and it is envisaged that the values higher than the numerical value assigned to the physical parameters, dimensions and quantities fall within the scope of the invention unless there is a statement in the specification to the contrary.

While considerable emphasis has been placed herein on the specific features of the preferred embodiment, it will be appreciated that many additional features can be added and that many changes can be made in the preferred embodiment without departing from the principles of the disclosure. These and other changes in the preferred embodiment of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.