C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 283/00 (2006.01) C08G 18/08 (2006.01) C08G 18/70 (2006.01) C08G 18/72 (2006.01) C08G 18/75 (2006.01) C09D 151/08 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2258804
Aqueous dispersions of urethane polymers and vinyl polymers (e.g., acrylics) are disclosed that provide water-based coating compositions with good adhesion following humidity exposure. The dispersion is predominately urethane, and the polyurethane is made from a first and a second polyisocyanate, the first polyisocyanate having at least one open carbon chain greater than six carbon atoms in length between two isocyanate groups, preferably at least eight carbon atoms in length. The vinyl monomers are polymerized in the presence of the aqueously dispersed polyurethane.
L'invention porte sur des dispersions aqueuses de polymères d'uréthane et de polymères de vinyle (par exemple acryliques) formant des compositions de revêtement aqueuses présentant une bonne adhérence après exposition à l'humidité. La dispersion est essentiellement composée d'uréthane, et le polyuréthane est fait d'un premier et d'un deuxième polyisocyanate, dont le premier comprend au moins une chaîne ouverte de carbone de plus de six atomes (et de préférence de plus de huit) de long entre deux groupes isocyanate. Les monomères de vinyle sont polymérisés en présence du polyuréthane en dispersion aqueuse.
Burgman John W.
Eifert Mary
Natesh Anbazhagan
Rosenberger Mary Ellen
Schimmel Karl F.
Borden Ladner Gervais Llp
Ppg Industries Inc.
Ppg Industries Ohio Inc.
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