Aqueous dispersion of composite particles
An aqueous dispersion and composite particle technology, which is used in skin care preparations, medical preparations containing active ingredients, pharmaceutical formulations, etc. Opacity etc.
Active Publication Date: 2021-04-13
DOW GLOBAL TECH LLC +1
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Problems solved by technology
However, in some applications it is desirable to minimize sulfonates, phosphates and other strong salts as these salts can cause reduced water and corrosion resistance
Polyacrylic acid and polymethacrylic acid homopolymers, copolymers and related commercially available dispersants are not effective in promoting the stable formation of latex-pigment composite particles (which can be done well with certain thickener types) and can Poor color acceptance and reduced opacity in
Method used
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example 1-3 and comparative example A
[0097] Examples 1-3 and Comparative Examples A-H. Form waterborne coating composition
[0098] Stable aqueous coating compositions, Examples 1-3, were prepared according to the methods set forth in Table 1.1. The pigments were dispersed with the water soluble polymers indicated in Table 1.2, and the same or different dispersants were added later to make up the desired total dispersant content. Adjust the abrasive pH to 9. Combine and mix the abrasive and binder for about 30 minutes; keep the solids volume at this stage as high as practicable. After combining the abrasive and binder, the surfactant and thickener are added. Volume Solids (VS) is 35% and Pigment Volume Concentration (PVC) is 16% TiO 2 .
[0099] Table 1.1 Aqueous composition formation (all amounts are in g)
[0100] Abrasives Water Soluble Polymer (50%) 1.12 water 7.93 TI-PURE TM R-706
37.53 Abrasive Subtotal 46.58 water 5.00 Abrasive Subtotal 51.58 ...
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Abstract
The present invention provides a stable aqueous dispersion comprising certain composite particles and a method for forming said stable aqueous dispersion. Composite particles include pigment particles having disposed thereon certain water soluble polymers comprising copolymerized carboxylic acid monomers and N-containing monomers, and the pigment particles have water soluble A soluble polymer carrying a plurality of water-insoluble polymer particles disposed thereon. A dry coating formed from the aqueous dispersion is also provided.
Description
technical field [0001] The present invention relates to a stable aqueous dispersion comprising certain composite particles and methods for forming said stable aqueous dispersion. In particular, the present invention relates to composite particles comprising: pigment particles having disposed thereon a water-soluble polymer as copolymerized units, the water-soluble polymer being based on the weight of the water-soluble polymer The soluble polymer comprises 10% to 30% by weight of the ethylenically unsaturated carboxylic acid monomer (when the molecular weight of the ethylenically unsaturated carboxylic acid monomer is 70 to 100), or by weight of the water soluble polymer , 15% to 40% by weight of the ethylenically unsaturated carboxylic acid monomer (when the molecular weight of the ethylenically unsaturated carboxylic acid monomer is in excess of 100 to 500); and 5% by weight, based on the weight of the water-soluble polymer Up to 95% by weight of ethylenically unsaturated, N...
Claims
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IPC IPC(8): C09D17/00C09D7/61C09D7/65C09D7/80
CPCC09C1/3676C08F220/06C08F220/14C08F220/34C09D5/028C09D17/008C09D133/08C09D133/24C08L2201/54A61Q19/00A61K8/8152A61K8/0241A61K2800/10A61K2800/43A61K2800/624A61K2800/651C09D7/61C09D133/14C08K2003/2241C08L101/00C08L1/00C08L2205/03C08K3/22C08F283/01A61Q17/04A61K8/8117A61K8/04C08L33/14
Inventor A·K·范戴克J·P·德罗契尔K·J·亨德森L·S·M·里维埃拉A·辛格
Owner DOW GLOBAL TECH LLC