C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/06 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/42 (2006.01) C08G 18/66 (2006.01)
Patent
CA 2255159
The present invention relates to an aqueous coating composition containing prior to the reaction between components A) and B) A) 10 to 75 wt.%, based on the solids contents of components A) and C), of at least one dispersion or solution of a polyester polyol containing carboxylate and/or sulphonate groups, having a weight average molecular weight of 1,000 to 40,000, an OH number of 15 to 100 and an acid number of 2 to 40 based on all of the carboxylate, carboxyl and sulphonate groups, B) an ester-modified polyisocyanate having an average NCO functionality of 2 to 6 and containing 5 to 20 wt.% of ester groups (calculated as C3O2, MW 68), 5 to 18 wt.% of isocyanate groups and 0 to 20 wt.% of chemically incorporated hydrophilic, nonionic groups, wherein the preceding percentages are based on the solids content of the ester modified polyisocyanate and C) 25 to 90 wt.%, based on the solids contents of components A) and C), of at least one physically drying, aqueous polyurethane dispersion containing carboxylate and/or sulphonate groups, wherein components A) and B) are present at an NCO/OH equivalent ratio, based on the isocyanate groups of component B) and the hydroxyl groups of component A), of 0.3:1 to 5:1. The present invention also relates to the coatings prepared from these coating compositions, which have improved resistance to suntan lotion.
Martin Kyli
Parkerson-Hoy Shelley
Shaffer Myron W.
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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