WO/2011/014198 | ELECTRICALLY CHARGEABLE ENCAPSULATED PARTICLES |
WO/2002/016471 | DISPERSIONS CONTAINING POLYETHER DISPERSANTS |
WO/2002/030913 | AQUEOUS DISPERSION FLUIDISING AGENTS |
CONLEY TARA L (US)
WO2022031444A1 | 2022-02-10 |
US20170088713A1 | 2017-03-30 | |||
EP3403505A1 | 2018-11-21 | |||
US20130217780A1 | 2013-08-22 | |||
US4670167A | 1987-06-02 | |||
US20070048345A1 | 2007-03-01 |
Claims: 1. A composition comprising, based on the weight of the composition, a) from 50 to 90 weight percent water, b) from 9 to 45 weight percent of a carboxylic acid functionalized dispersant; c) and from 0.5 to 10 weight percent of a compound of Formula I: wherein each R is independently H, methyl, or ethyl; R1 = –R2-NR3-(CH2CH2O)z-H; or –C6-C18-alkyl; or –C(CH3)2R4; x is from 1 to 40; y is from 0 to 39; and z is from 0 to 39; with the proviso that when y is 0, R1 is –C(CH3)2R4; and when y is from 1 to 39, R1 is –R2-NR3-(CH2CH2O)y-H or –F-alkyl; R2 is –CH2CH2CH2– or –CH(CH3)CH2– or –CH2CH(CH3)–; R3 is saturated or partially unsaturated C10-C22-alkyl; R4 is C1-C20-alkyl; and x + y + z = 1 to 40; wherein at least 80 weight percent of the composition comprises water, the dispersant, and the compound for Formula I; and wherein the composition has a pH in the range of from 8 to 11. 2. The composition of Claim 1 which has a pH in the range of from 8.5 to 10 wherein, based on the weight of the composition, the concentration of water is in the range of from 55 to 85 weight percent; the concentration of the carboxylic acid functionalized dispersant is in the range of from 15 to 45 weight percent; and the concentration of the compound of Formula I is in the range of from 1.5 to 8 weight percent. 3. The composition of Claim 2 wherein the compound of Formula I is represented by the compound of Formula Ia: where R4 is C6-C14-alkyl, and x = 2 to 30; or the compound of Formula Ib: where R3 is a saturated or partially saturated C14 C20 alkyl, or saturated or partially saturated C16-C18-alkyl, and x + y + z = 2 to 32; or the compound of Formula Ic: where R1 is C12-C18-alkyl, and x + y = 12 to 18. 4. The composition of Claim 3 wherein the compound of Formula I is represented by the compound of Formula Ia: where R4 is decyl and x = 2 to 10. 5. The composition of either of Claims 3 or 4 wherein the weight-to-weight ratio of the carboxylic acid functionalized dispersant to the compound of Formula Ia is in the range of from 5:1 to 10:1; wherein the composition further includes 2-amino-2-methyl-1-propanol. 6. The composition of any of Claims 1 to 4 wherein the carboxylic acid functionalized dispersant is selected from the group consisting of a homopolymer of acrylic acid, a homopolymer of methacrylic acid, a copolymer of acrylic acid and methacrylic acid, a copolymer of acrylic acid and hydroxypropyl acrylate, a copolymer of acrylic acid and hydroxyethyl methacrylate, a copolymer of methacrylic acid and hydroxypropyl acrylate, a copolymer of methacrylic acid and hydroxyethyl methacrylate, and a copolymer of maleic anhydride and diisobutylene; wherein the composition further includes 2-amino-2-methyl-1- propanol. 7. The composition of Claim 6 wherein the carboxylic acid functionalized dispersant is selected from the group consisting of a homopolymer of acrylic acid, a copolymer of methacrylic acid and hydroxypropyl acrylate, and a copolymer of maleic anhydride and diisobutylene. 8. The composition of any of Claims 1 to 7 which further comprises, based on the weight of the composition, from 1 to 20 weight percent of a nonionic ethoxylated C6-C12 alcohol, or a nonionic propoxylated C6-C12 alcohol or a nonionic ethoxylated-propoxylated C6-C12 alcohol. |
Preparation of Samples for Microbial Resistance of TiO2 Four samples were prepared by adding each of the dispersant compositions of Examples 1-4 with Kronos 2311 TiO 2 slurry to a speedmixer (Flaktek, Inc.) with mixing at 1500 rpm for 2 min. A comparative Dispersant Blend was prepared by combining a sample that did not contain RW-20 with the TiO 2 slurry. Table 2 illustrates the make-up of the modified TiO 2 slurry compositions. Kronos 2311 TiO2 Slurry was used as the opacifying pigment for each study. Composition refers to the dispersant compositions of Examples 1-4. Table 2 – TiO2 Slurry Compositions Sample Ex. No. TiO2 (g) Composition (g) Water (g) 1 Ex.1 76.5 0.50 23.0 2 Ex.2 76.5 1.00 22.5 3 Ex.3 76.5 0.80 22.7 4 Ex.4 76.5 0.57 22.9 The concentration of dispersant in each sample was 0.2 weight percent, based on the weight of the sample. The dispersant compositions and the slurry compositions were inoculated 3 times at 7-d intervals with 10 6 -10 7 colony forming units per milliliter of sample (CFU/mL) of a standard pool of bacteria, yeasts, and molds obtained from American Type Culture Collection (ATCC) that are common contaminants in coatings. Once inoculated, the samples were stored in 25 ºC incubators. Test samples were monitored for microbial contamination by agar plating using a standard streak plate method. Samples were plated 1 d and 7 d after each microbial challenge onto trypticase soy agar (TSA) and potato dextrose agar (PDA) plates. All agar plates were checked daily up to 7 d after plating to determine the number of microorganisms surviving in the test samples. When not being checked, the agar plates were stored in incubators, 30 ºC for TSA plates and 25 ºC for PDA plates. The extent of microbial contamination was established by counting the colonies, where the rating score was determined from the number of microbial colonies observed on the agar plates. Reported results come from day 7 readings. Results are described by the rating score for each type of microorganism: B = bacteria, Y = yeast, and M = mold. For example, a 3B describes a plate with 3 rating score for bacteria, or a Tr Y(1) describes a plate with trace yeast (1 colony on plate). Table 1 illustrates the rating system used to estimate the level of microbial contamination on streak plates. Colonies refers to the number of colonies on the plate. Table 3 illustrates the rating system estimating microbial contamination. Table 3 – Rating system for estimating microbial contamination Colonies Rating Score Contamination Result None 0 None Pass 1-9 Tr Trace Pass 10 to 99 1 Very Light Fail 100 to ~1000 2 Light Fail ~1000 to 10,000 3 Moderate Fail >10,000 4 Heavy Fail Table 4 illustrates the results of three challenge tests (C1 – C3) for the dispersant compositions. Table 4 – Challenge Test Results for Dispersant Compositions Ex. No. C1 Final C2 Final C3 Final 1 PASS PASS PASS 2 PASS PASS PASS 3 PASS PASS PASS 4 PASS PASS PASS In contrast, the copolymer of AA and HPA and the homopolymer of AA that did not contain the RW-20 amine ethoxylate surfactant failed all three challenge tests. Table 5 illustrates the three challenge tests for the TiO2 slurry compositions. Comparative Sample 1 (Comp.1) was prepared without RW-20.
Table 5 – Challenge Test Results for TiO2 Slurry Compositions Sample TiO 2 Dispersant Blend C1 Final C2 Final C3 Final Comp.1 Kronos 2311 no RW-20 FAIL FAIL FAIL 1 Kronos 2311 1 PASS PASS PASS 2 Kronos 2311 2 PASS PASS PASS 3 Kronos 2311 3 PASS PASS PASS 4 Kronos 2311 4 PASS PASS PASS The results show the efficacy of the dispersant composition beyond preservation of the composition itself. It is believed that the dispersant composition would be useful in improvement the preservation of other additives used in paint formulations.
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