发明名称 |
GRADIENT POLYMER COMPOSITIONS FOR ELASTOMERIC WALL AND ROOF COATINGS |
摘要 |
The present invention provides aqueous compositions for use as elastomeric roof coatings having excellent tint retention which comprise (i) one or more gradient emulsion copolymers having a weight average particle size of from 20 to 550 nm, (ii) a large particle size filler, preferably silica, (iii) one or more chromatic colorants other than a white colorant in the amount of from 0.2 to 15 wt. %, based on the total weight of solids in the composition, and (iv) other pigments, extenders or fillers, wherein the resulting composition has a particle volume concentration (% PVC) of from 20 to 65%. The present invention provides methods of making the one or more gradient emulsion copolymers. |
申请公布号 |
US2016369122(A1) |
申请公布日期 |
2016.12.22 |
申请号 |
US201515122287 |
申请日期 |
2015.02.25 |
申请人 |
ROHM AND HAAS COMPANY |
发明人 |
Rokowski Joseph M.;Evans Ann E. |
分类号 |
C09D133/12;C09D7/00;C09D7/12;C09D5/00 |
主分类号 |
C09D133/12 |
代理机构 |
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代理人 |
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主权项 |
1. A low volatile organic content (VOC) aqueous composition comprising:
(i) one or more gradient emulsion copolymers having a broad measured glass transition temperature (measured Tg) which one or more gradient emulsion copolymers are the copolymerization product of (a) a soft vinyl or acrylic monomer composition of one or more nonionic vinyl or acrylic monomer and at least one ethylenically unsaturated acid functional monomer, which when polymerized would provide a polymer having a calculated Tg of from −100 to −5° C., and (b) from 20 to 50 wt. %, based on the total weight of monomers used to make the gradient emulsion copolymer, of a hard monomer composition which when polymerized would provide a polymer having a calculated Tg of from 20° C. to 150° C., the one or more gradient emulsion copolymers further having a weight average particle size of from 200 to 550 nm; (ii) one or more large particle size filler chosen from a pigment, an extender and mixtures thereof; and, (iii) one or more chromatic colorant other than a white colorant in the amount of from 0.2 to 15 wt. %, based on the total weight of solids in the composition, wherein the aqueous composition has a pigment volume concentration (% PVC) of from 20 to 65%. |
地址 |
Philadelphia PA US |