Matrix

Technical background

The invention relates to a matrix for dissolving a functional compound as well as to a method of preparing and using of such a matrix. The invention also relates to a method of preparing a product comprising a functional compound and to the use of such a product.

Scents have traditionally been added to products by directly dosing them into the base material, or, by spraying scented compounds into a printed product, for ex- ample. The known technologies suffer from the problem that the dosing of the scented compound either is laborious and expensive or the scented compound cannot be dosed into the printed product in a sufficient amount. The scent can also be created by enclosing an odorizing agent in a capsule and by subsequently rubbing or abrading it. This method is also laborious and technically complicated. Be- sides, a method is known in which a scented compound is added to a product, included in printing ink, varnish and/or glue. In the methods, it is necessary to either activate the product or to install/remove a separate protective film in order to enable a controlled release of the scent.

General description of the invention Now, a matrix dissolving a functional compound has been invented, which matrix is technically especially advantageous for dosing and releasing the functional compound. The invention also relates to a method of preparing, and to the use of, such a matrix, as well as to a method of preparing a product comprising a functional compound, and to the use of such a product. In order to achieve this objec- tive, the invention is characterized by what is set forth in the independent claims. The rest of the claims disclose some preferable embodiments of the invention.

The matrix according to the invention has been provided with at least one film- forming agent and at least one solvent dissolving a functional compound and ho- mogenizing the film-forming agent. The matrix is a technically especially advantageous way of dosing and releasing a functional compound. The matrix according to the invention makes it possible to dissolve, as well as to dose, functional compounds, such as scents, and to release them from different substrates and prod- ucts in a film-assisted, controlled way. Such a matrix is mixable with a very large variety of compounds. The release of the functional compound can be controlled and adjusted by changing the thickness and properties of the film formed by means of the matrix. According to an object of the invention, the nature of the odor can also be fine adjusted by changing the thickness and properties of the film. The matrix/product is usable for a desired period of time, without any separate activation. Thus, it has very wide and substantial applications and possibilities of implementation.

The matrix is usable, as such, for dosing a functional compound, or, it is usable for manufacturing a product by printing or by dosing in some other way. A permeable film can preferably be provided on the drying matrix and/or product, in order to lower the diffusion rate of the functional compound and in order to release it during an extended period of time compared to a filmless product. The matrix/product is preferably usable as a scented product, odor regulator/remover, repellent, attract- ant and/or pesticide. The matrix alone is also usable for preventing or adjusting the release of functional compounds. Besides, the product can be provided with a plastic film or a paraffin film, for example, to further regulate the release of the functional compound.

According to an object of the invention, the film-forming agent is ethyl cellulose. It forms a stable permanent film that is clear, UV stable, i.e. non-yellowing, highly temperature-resistant from -70 °C to 150 °C (screenprinting 60 °C and textile printing 140 °C), inexpensive and safe to use. Ethyl cellulose in itself does not dissolve in water but can be get there by means of a solvent, such as ethanol.

According to an object of the invention, the solvent is an alcohol. According to an object of the invention, the solvent is ethanol. Preferably, the ethanol is as wa- terfree as possible or completely waterfree. Alcohols are good solvents for a large variety of compounds. Ethanol is safe to use because it gives a non-toxic matrix. It in itself is almost odorfree and technically easy to vaporize. The choice of solvent/solvents and film-forming agents depends on the functional compound desired. Some solvents/film-forming agents are usable for a very large variety of compounds. A preferred combination is ethanol as the solvent and ethyl cellulose as the film-forming agent.

According to an object of the invention, at least one scent is provided as a functional compound in the matrix. The scent may vary to a large extent. The choice of solvent/solvents and film-forming agents depends on the scent desired. Some sol- vents/film-forming agents are usable for a very large variety of compounds. According to an object of the invention, the scent is allergy-tested and/or such that it does not cause allergy, oversensitivity, sensitivity to light or general irritation to those subjected to it. Such products are safe to use in many different applications. Preferably, the scent can also be such that is suitable for use in foodstuffs. According to an object of the invention, at least one deodorizing agent, repellent, attractant or pesticide is provided as a functional compound in the matrix. Such applications can be used in product treatment, research or fishing/hunting, or, for killing or attracting insects or rodents, for instance. It is also possible to combine an attractant and a pesticide in the same product. Still, it is possible to manufac- ture a product that simultaneously repels some animals and attracts other animals.

According to an object of the invention, the matrix comprises at least one viscosity regulator. This widens the use of the invention because the matrix thereby also becomes usable where the matrix and the functional compound to be added need to have a certain viscosity in order to be dosable. According to an object of the in- vention, the viscosity regulator is a silicate compound. The silicate compound changes the viscosity of the product and may further enhance the binding of the scented compound to the solution. Different silicate compounds can be used for different purposes. According to an object of the invention, the matrix present in the product comprising a functional compound is printed, or dosed in some other way, into the product by a method chosen from a group including offset technology, screenprinting technology, flexo printing technology, inkjet/digital printing technology, tampo printing technology, gravure printing, relief printing, rotary printing, spray preparation, mist preparation. According to an object of the invention, at least one printing agent is provided in the matrix. The addition of the printing agent allows the functional compound/the matrix to be printed into products. The product can vary to a very large extent. It can be, for example, a product that is in use in the initial processing of a product, or in the final processing of an already finished product, or, it can be in use in mixed printing technology. The compound can be dosed in an especially accurate manner and the operation of the process can be adjusted, both in terms of the scented compound itself, and, of all the rest, according to any current requirements. The printing into the product is a very easy and technically simple so- lution. No separate equipment is needed for the printing, but still, the same very great advantages related to the printing technology are achieved as in printing in general. Therefore, the addition of the compound/compound is technically highly efficient. At the same, it is very reasonable from the economic point of view. For example, the method can produce shirts which then are printed with a desired de- sign or color, for instance. Thus, this novel method gives, also in this respect, a substantial advantage compared to the known art. According to an object of the invention, the manufactured product comprising a scented compound can be used, for example, as a product belonging to a group including fibrous products, such as textile, fabric, felt, cotton, accessory, sweatband, wristband, piece of cloth, trousers, shirt, cap, beanie, headgear, holdall, bag, cardboard beer mat, cardboard picture, vending rack, storage box, display box, brochure and catalogue, album, folder, mobile, table rack, floor rack, price wobbler, product box, packaging material, casing, pack, leaflet, calendar, ruler, display, container, dispenser, coaster, business card, form, envelope, catalogue, desk mat, plastic folder, briefcase, pouch, background advertisement, product information card, tablecloth, table talker, box or any other means or product designed for sales promotion, marketing, di- rect mail. The product can be a semi-finished product or a finished product and intended for sales and marketing, for example, or even for consumers.

According to an object of the invention, the at least one printing agent is a varnish from a group including solvent varnish, protective varnish, colorless varnish, trans- lucent varnish, opaque varnish, colored varnish, printing varnish, paper varnish, textile varnish, offset varnish, dispersion varnish, UV varnish. It is especially preferable to use varnish as the printing agent because it allows, both technically and economically, the functional compound/matrix to be added to a large variety of products. According to an object of the invention, the at least one printing agent is printing ink or glue. This allows even more ways of adding the functional compound/matrix. Besides, it also becomes possible to influence on the intensity and duration of the release of the functional compound. According to an object of the invention, the at least one printing agent is a solvent-based, water-based and/or resin-based printing agent used in digital printing. This is an application of great importance because it allows functional compounds, such as scents, to be added in an important field of the printing technology.

According to an object of the invention, at least one carrier, such as spray gas carrier or mist carrier, is provided in the matrix. The earner allows the functional compound/matrix to be dosed into textiles or cardboard without any printing technolo- gy. Besides, it makes it easy to repeat any desired treatment at regular intervals, such as every 1 or 2 months.

According to an object of the invention, the solvent is vaporized out of the matrix/product. The vaporization can be carried out either passively or actively. Then, a film is formed on the matrix, which, preferably without any separate activation, controls the release of the functional compound. According to an object of the invention, the product is ovened after the printing. This speeds up the vaporization/drying and the manufacture in general. It also enhances the manageability of the products. According to an object of the invention, the matrix also has been provided with a surfactant, as a binding agent, for mixing and binding the carrier. The surfactant is preferably an anionic surfactant. The surfactant is preferably SDS (sodium lauryl sulphate). The SDS content can be, for example, 0.5 to 2 % (w/v), preferably over 0.8 % (w/v) or over 1 % (w/v), for instance.

According to an object of the invention, accelerators are added to the matrix to enhance the binding of the scented compound. The method is thereby ensured, adjusted and enhanced to be optimal.

The base material of the product can be chosen, for example, from a group includ- ing paper, paperboard, cardboard, wood product, plastic, rubber, metal, glass, ceramic product, textile. According to an object of the invention, the product is a fibrous product, preferably a textile, for example. The method is especially suitable for printing textiles, for example. According to an object of the invention, at least one printing ink, glue and/varnish is also printed on the base material of the prod- uct by some other printing technology. Thus, the method is very useful for a large variety of applications.

Compared to the known art, the product manufactured by the method has the special advantage of being capable of easily and accurately controlling the amount of the compound in the product. In addition, the way that the printing is done results in the advantage of allowing control of the release thereof. As an example, it is possible to manufacture a product in which a scent has been printed, by screen- printing, into the printing inks and then partially coated by breathable varnish. The scent is released from the product over a long time span. The scent can also be printed into the product in a combination with the surface varnish to make it re- lease relatively faster and in higher concentrations.

The scent can be any substance, compound or mixture causing at least some odor that can be sensed or measured. It can comprise only one such substance, mixture or compound or it can comprise two or more substances, compounds and/or mixtures in different proportions. The scent can also be a plant or a part thereof comprising one or more odor-causing substances, compounds and/or mixtures. The scent can also be a plant extract, for example. In this patent application, a scent refers to a compound which, mainly or at least partly, causes this scent. However, such a scent can vary, for example, an apple scent can be the scent of an acidic apple or the scent of a sweet apple, and bread, for instance, can have a wide range of scents.

According to an object of the invention, the product printed by a printing technology or the product dosed with a compound in some other way, is also provided with raised characters, recesses and perforations, such as embossed characters by braille technology or some other equivalent technology. Preferably, this provides combinations for the blind and the visually impaired, for example. Preferably, it is also useful where the product is handled in the dark, for example.

According to an object of the invention, the scent comprises one or more organic scented compounds. These allow a wider range of applications for the invention. As an example, they can create scent combinations which otherwise would have to be done at the scent raw material level. By combining the scent of vanilla with the scent of raw tobacco, for example, a combination resembling a vanilla cigar is obtained. According to an object of the invention, the scent comprises one or more scented inorganic compounds. These allow an even wider range of applications for the invention.

According to an object of the invention, the at least one ink is chosen from the following group: paper inks, plastic inks, textile inks, UV inks. The paper inks can be solvent and water based. Further, it possible to use inks with different gloss levels, such as inks giving a matte or glossy finish. Further, it is possible to use scratch- off ink, which is used, for example, on lottery tickets, or fluorescent ink, which absorbs light and glows in the dark, or light-reflective inks. This embodiment is useful, for example, where it is desirable to attract by both color and smell at the same time, such as in the manufacture of fishing lure coatings, or in luminous tags with scent, or in scented hunting vests intended to block the human scent which ani- mals want to stay away from. Basically, all plastic inks are solvent-based. The plastic inks can also be either matte or glossy. It is also possible to use, for example, two-component plastic inks on metal surfaces. Further, pigment or base paste inks, which are used for toning down colors and or as a base color, can be chosen from the plastic inks. The textile inks are usually divided into plastisol, 1 or 2 component as well as wa- tercolor-based inks. Further, it is possible to use different kinds of opaque inks, fluorescent inks and thinners.

The invention can also utilize UV drying inks. They are equivalent to the other inks but do not dry if not exposed to UV light. The inks can be blended at the printing factory or the printing factory can order ink with a certain shade directly from an ink supplier.

According to an object of the invention, one or more scented compounds chosen from the following group are added:

- the scent of a tar product, such as tar water or pit tar, - the scent of a smoke, such as chimneyless sauna or tar smoke,

- the scent of a drink, such as coffee, cocoa, tea, mead, wine or beer,

- the scent of a plant, such as mint or birch,

- the scent of a spice, such as garlic, black pepper or white pepper,

- the scent of a fruit, such as apple, - the scent of a flower, such as rose or lily-of-the-valley,

- the scent of a foodstuff, such as bread, bun, smoke-cured meat or smoked fish,

- the scent of an animal, such as horse,

- the scent of a berry, such as raspberry. The invention has very wide application possibilities for most different purposes. These make the invention even more useful.

Detailed description of the invention

Formulation of scent compounds into paper and textile varnish

The chemicals used were as follows:

P (varnish): Aquacolor Gloss WB381 (Sericol)

Txt (varnish): Texopaque OP00A (Sericol)

Emulgators:

Sodium dodecyl sulphate SDS (Sigma)

Montanox 20 and Montanox 80 (Seppic Food grade)

Amidet N (Kao)

Rheology modifiers:

Aerosil 200 (Evonik)

Aerosil COK 84 (Evonik)

Sylothix 51 (JRS)

Scents:

Parfum Coffee Latte (Holland Aromatics)

Parfum Wild Strawberry (Holland Aromatics)

Parfum Apple (Holland Aromatics)

Film-forming agents:

Aqualon EC N10 (Hercules, pharm. grade)

Natrosol 250 HR (Ashland, pharm. grade)

Benecel A4C (Ashland, pharm grade)

Measuring equipment

The measuring instruments, water baths and buffer solutions were calibrated and under quality control.

-Brookfield Model DV-II+ Viscometer (dynamic)

-temperature-controlled water bath Julabo

-pH-meter Phenomenal VWR -buffer solutions with pH 4, 7 and 11 AVS Titrinorm BDH Prolabo

-GC double column mass spectrometry headspace technology

-Agilent 5973 N MS-GC

-Purge&Trap Consentrator Recipe (KA Aroma):

P - 70 wt% P (paper varnish)

- 30 wt% of a mixture as follows:

- 90 wt% scent

- 10 wt% SDS (20 wt% water solution) T - 70 wt% T (textile)

- 30 wt% scent

Initial testing results:

-the scents were poorly dissolved in water and varnish P,

-the scents were directly dissolved in varnish in a test that used varnishes from the product family of Sericol, intended for both paper and textile,

-P comprised solvents of which 10 wt% vaporizable of which 10 wt% flammable 1- metoxy-2-propanol and water

-T comprised slowly vaporizing solvents, of which 20 to 25 wt% Xi-classified bis(2- ethylhexyl)maleate, and a small amount of complexed Zn tall oil fatty acid alumi- num chloride derivate as a catalyst,

- it was observed that different scents required different amounts of emulgators in order to emulgate into varnish P,

- it was observed that the Tr lauryl version was not stable but the viscosity varied from 100 000 to 200 000 MPas (25 °C) For example, for the scent Latte the color of which also allowed the stability to be observed,

Pr:

- 700 g P

- 250 g Latte - 50 g (20 wt% SDS water solution) Tr:

- the preceding solution with added 2 wt-% Aerosil 200

Viscosities (mPas, 25 °C):

-P initial 12 600

-Pr mixture final 1 1 800

-T initial 16 800

-Tr mixture19 200

-Tr mixture final 100 000 to 200 000 pH values:

- scents 6 to 7 mildly acidic, drift

- SDS 9.4

- P and T 7

- Pr 7

-Tr mixture 5

- Latte + SDS 3.3 to 3.4 SDS to the bottom, jellylike, reacted after a few days,

- Strawberry + SDS 4.4

- Apple + SDS 4.9

Emulgators

NDS is an anionic emulgator. It, and the protons released from the scents, increase the salt concentration of the solution, with an impact on the solubility equilibrium. NDS was replaced with non-ionic emulgators. Polysorbate 20 (Montanox 20) and Polysorbate 80 (Montanox 80), which is even more oil-soluble, they both being easy-to-use when in liquid form, were tested. Amidet N (PEG-2 rapeseed oil amide derivative) was also tested. All of the emulgators resulted in unstable scent- dependent emulsions.

Film-forming agents Hydrocolloids that were non-ionic and had other appropriate properties were chosen as the film-forming agents (protonation of the scents). HEC (Natrosol 250 HR) which dissolves in water and HPMC (Benecol A4C) which dissolves in water and partially in solvents. There are commonly used as matrix release agents in medici- nal chemistry.

- Natrosol 250 HR (1 w% water solution) pH value 7.5

viscosity 2 900 mPas (25° C)

- Benecel A4C (1 w% water solution) pH value 7.4

viscosity 60 mPas (25 °C) Rheology modifiers

As rheology modifiers, Aerosil 200 (fumed silica), Aerosil COK 84 (a melt mixture of quartz and aluminum), showing higher resistance in a polar environment, Sylothix 52 (consists of polyethylene fibers).

Mixtures Pr and Tr were made with a film-forming agent

- Pr + 1 wt% Natrosol 250 HR viscosity 217 000 mPas and pH value 7

- Pr + 1 wt% Benecel A4C viscosity 120 000 mPas and pH value 7

- Tr + 1 wt% Benecel A4C + 2 % Aerosil 200 viscosity 260 000 mPas and pH value 5

- Tr + 1 wt% Natrosol 250 HR viscosity 14 000 mPas and pH value 5 Results

-> the degree of protonation of the scents in water varies

-> when NDS as anionic emulgator, a stability problem with different scents -> non-ionic emulgators Natrosol 250 HR and Benecel A4C

-> Natrosol 250 HR and Benecel A4C dissolve in Tr comprising SDS water solu- tion and the Aerosil 200 amount required becomes smaller by half

-> Pr solutions with Natrosol 250 HR and Benecel A4C have excessive viscosity -> scents cannot be emulgated into a stable mixture with varnishes and added into them

Mixtures Ti were made without an emulgator (70/30 = varnish T/scent): - 210 g T

- 90 g Latte

Initial viscosity of the mixture 15 000 mPas

Ti + 2 wt% Aerosil (6 g) -> final viscosity 150 000 mPas

Ti + 3 wt% Aerosil (9 g)-> final viscosity 180 000 mPas

Ti + 1 wt% Natrosol 250 HR viscosity 18 000 mPas

Ti + 1 wt% Natrosol 250 HR + 3 wt% Aerosil 200 viscosity 120 000 to 170 000 mPas (sails)

Ti + 1 wt% Benecel A4C viscosity 17 000 mPas

Ti + 1 wt% Benecel A4C + 3 wt% Aerosil 200 viscosity 170 000 mPas

Results

-> Benecel A4C can be used as a film-forming agent without any water emulgator for textile varnish

Utilization of extraction A solvent perfectly dissolving scents in both aqueous and solvent phases was needed.

- the solvent must be generally available, inexpensive and safe (with known toxicology)

- the solvent must be "odorless"

- the solvent must vaporize from the matrix

- the solvent must keep the film-forming agent homogenous in the solution

- a permeable film structure must be formed while the solvent vaporizes

- the agent on which the film is formed must be soluble in the film-forming agent

- the film-forming agent must be generally available, inexpensive and safe (with known toxicology)

Both a straight-chain and a branched-chain alcohol were tested.

Homogenous solution Pf was made

- 68.3 wt% P

- 22.9 wt% scent - 8.2 wt% ethanol (Industol)

- 0.61 wt% N10PH

- A12, a purer grade of alcohol, can also be used (more odorless; with a different bitter element). A branched alcohol (such as 2-propanol) works as well but it has a more pungent smell and is needed in a triple amount.

- Ethyl cellulose (N10PH) does not dissolve in water but can be get there by means of an alcohol. It forms a permanent film which is clear, UV stable, i.e. non- yellowing, temperature-resistant from -70 °C to 150 °C (screenprinting 60 °C and textile printing 140 °C), inexpensive and safe. Tf:

Homogenous solution Tf was made in the same way as Pf

- 68.3 wt% T

- 22.9 wt% scent

- 8.2 wt% ethanol (Industol)

- 0,61 wt% N10PH

If needed, the ethanol content can be decreased down to 5.9 wt% (the varnish comprises solvents).

Solution Tf was made thicker

- Aerosil 200 viscosity does not increase; e.g 2 wt% 53 000 mPas (25 °C) - Sylothix 51 4 wt% 40 000 mPas (25 °C, becomes granular)

-> do not work in a polar environment

-> Aerosil COK 84 silicon aluminum oxide for a polar environment

- Tf thickened 3.7 wt% 130 000 mPas (25 °C)

Note also that the scent can be perfectly dissolved in P with a small amount of al- cohol. This allows the scent to be concentrated into varnish:

- 68.3 wt% P

- 29.3 wt% scent (Latte)

- 2.4 wt% ethanol The scent (Latte) could be concentrated into textile varnish in an amount of 40 %.

- 60.0 wt% T

- 40.0 wt% scent (Latte)

For paper varnish and textile varnish, the following mixture can be used:

- 22.9 wt% scent

- 8.2 wt% ethanol (Industol)

- 0.61 wt% N10PH

For paper varnish

- 68.3 wt% P

A ready mixture as follows

- 72.3 wt% scent

- 25.8 wt% ethanol

- 1.92 wt% N10PH

is mixed with the paper varnish in an amount of 31.7 wt%. For textile varnish

- 68.3 wt% T and thickening with 3.7 wt% Aerosil COK 84

A ready mixture as follows

- 72.3 wt% scent

- 25.8 wt% ethanol

-1.92 wt% N10PH

is mixed with the textile varnish in an amount of 31.7 wt%, then thickening with 3.7 wt% Aerosil COK84.

In the paper and textile varnishes, the content of N10PH, once the alcohol has vaporized, is 0.82 wt% (initially 0.61 wt%). Printing and analysis

Solutions were made for printing and analysis (the weights are in grams).

P1 P2 P3:

P (varnish) 102.45 102.45 102.45 Latte 34.35 34.35

Industol 12.40 12.30 12.30

N10PH 0.92 0.92

These were printed by screenprinting (screen: 60 yarns/cm ² , 50 °C) 3.4.2013 on (the coated side of) paperboard. The printing order was P1 , P2 ja P3. After been taken out of the oven, the items in size A4 were dry and were cut into 1 cm x 4 cm strips. The strips were inserted into airtight vials. The scent of Latte and P1 were the standard and the matrix, respectively. 0.1 g more Industol had to be used in the matrix than in samples P2 and P3 to obtain a homogenous mixture. Two paral- lei measurements were made. The samples were analyzed for the release of the scent by head space GC-MS technology over a period of 0 to 4 weeks. The sample was heated at 30 °C for 10 minutes and the components were collected on a Tenax trap with a flow of helium. The components were desorbed from it into a cold trap (liquid nitrogen, -120 °C). The samples were stored in an odorless, well- ventilated place at room temperature.

The significant scent agents were 3-carene (fused six-membered and three- membered ring) ja d-limonene (six-membered ring), indane (fused aromatic six- membered and five-membered ring), straight-chain aldehyde octanal and solvent 1 -meroxy-2-propanol. Results and conclusions

The chosen film-forming technology works. The recipes are homogenous and useful for both paperboard and paper varnish applications. As the transfer of molecules through the film depends on their structure, it is impossible to determine how the scent precisely vaporizes through the film. Compared to the filmless samples, the vaporization was clearly reduced with the film. In the future, the marker can be any known scent compound, having an easy-to-determine retention time (the location of the peak) and content (the area of the peak). The risk of contamination should be avoided because citrus compounds, for example, are common in differ- ent detergents, such as hand and universal detergents. Longer research times impose a challenge in terms of both equipment adjustment and contamination.

The amount of D-limonene in a sample without film had dropped down to 0.51 % in 2 weeks, while its content in a sample with film was 20.8 %. The film had thus relatively lowered the diffusion rate by 86 % (week 0) and by 79 % (week 2). Note that each substance also has a characteristic scent threshold. For D-limonene it is 200 ppb.

The diffusion rate of 3-carene lowered by 51 % (week 0)

The diffusion rate of indane lowered by 32 % (week 0)

The diffusion rate of octanal was lowered by 36 % (week 0)

The diffusion rate of the solvent lowered by 43 % (week 0 and week 2)

The diffusion rate can be further lowered by increasing the thickness of the film. The research gives a good basis for optimizing the amount of the film-forming agent by means of a marker. A product/matrix that is

- standardized

- applicable for different scents

- applicable for different printing technologies

- salable in a commercial and product-safe way is obtained.

Combination of offset varnish and scent

The applicability of the results from the scent project on paper and textile varnishes (27.5.2013) to offset technology was studied.

The chemicals used were as follows:

Offset (varnish O) Novacoat 4060 (FlintGroup)

Scents Parfum Apple (Holland Aromatics)

Film-forming agent Aqualon EC N10 (Hercules, pharm. grade) Measuring equipment

The measuring instruments, water baths and buffer solutions were calibrated and under quality control.

- Brookfield Model DV-II+ Viscometer

- temperature-controlled water bath Julabo

- pH-meter Phenomenal VWR

- buffer solutions with pH 4, 7 and 1 1 AVS Titrinorm BDH Prolabo General

- O is an oil-based varnish with 10 to 20 % light paraffinic solvents

- the varnish also comprises, as a catalyst, cobalt-2-ethylhexacyanate

- O dries through an oxidation reaction

- the kinematic viscosity of O is 7 cSt (40 °C)

Results

A scent could be concentrated into the offset varnish in an amount of 56 wt% with- out alcohol. The textile and offset varnishes comprise solvents allowing the scent to be directly dissolved in the varnish.

Dynamic viscosities (mPas, 25 °C) and pH value

- O: 56 000 mPas / pH value 6.0

- mixture: 25 500 mPas / pH value 6.2

- 68.3 wt%

- 22.9 wt% scent

- 8.2 wt% ethanol

- 0.61 wt% N10PH

A mixture was made with

- 22.9 wt% scent

- 8.2 wt% ethanol

- 0.61 wt% N10PH

This was mixed with the offset varnish

- 68.3 wt% That is, a ready mixture with

- 72.3 wt% scent

- 25,8 wt% ethanol

- 1 ,92 wt% N10PH

was mixed with the offset varnish 31.7 wt%

The content of N10PH in the offset varnish, after the vaporization of the alcohol, is 0.82 wt% (initially 0.61 wt%). The mixture is fully homogenous. The paper, textile and offset varnish matrices are uniformly applicable.