C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 5/02 (2006.01) C08G 18/28 (2006.01) C08G 18/62 (2006.01) C09D 7/02 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2109964
An improved waterbased coating composition containing about 10-50 % by weight of film forming binder and pigment in a pigment to binder weight ratio of about 1/100 to 200/100 dispersed in an aqueous carrier and having a pH of about 7-10; wher- ein the improvement used in the composition is an acrylourethane pigment dispersing polymer in an amount of about 0.5-10 % by weight, based on the weight of the coating composition; the acrylourethane pigment dispersing polymer is composed of hydroxyl and carboxyl functional acrylic polyol having a hydroxyl number of about 50- 170 and an acid number of about 30-120 and chain extended with an aliphatic, cycloaliphatic or aromatic diisocyanate in the presence of a monohydric alcohol and the polymer has a weight average molecular weight of about 10,000-40,000 and the carboxyl groups are neutralized with ammonia or an amine.
Johnson Jefferey W.
Prottas Robert D.
Strolle Clifford H.
Bennett Jones Llp
E. I. Du Pont de Nemours And Company
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