C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/12 (2006.01) C08G 63/20 (2006.01) C08G 63/42 (2006.01) C08G 63/52 (2006.01) C08G 63/58 (2006.01) C09D 167/00 (2006.01)
Patent
CA 2238777
A polyester composition has a number average molecular weight Mn of between about 500 and about 1000, a weight average molecular weight Mw of between about 600 and about 2000, a polydispersity below about 2, preferably below about 1.8, hydroxyl functionality between 2 and 3, a hydroxyl value of between about 160 and about 260, and an acid number below about 10. Less than about 5 % of the OH groups of the polyester are pendent, the rest being terminal. Between about 10 and about 50 wt% of the monomers used to form the polyester composition are anhydrides having the formula: (see fig. I) where R1 is a non-aromatic, saturated or unsaturated hydrocarbon chain having between 6 and 30 carbon atoms, R2 is hydrogen or a non-aromatic saturated or unsaturated hydrocarbon having between 1 and 8 carbon atoms, and R1 and R2 have, in total, between 8 and 30 carbon atoms. The polyester in conjunction with a hydroxyl-reactive curative provides a coating composition.
Composition de polyester possédant une masse molaire moyenne en nombre, Mn, d'environ 500-1000, une masse molaire moyenne en poids, Mw, d'environ 600-2000, une polydispersion d'environ 2, et de préférence environ 1,8, une fonctionnalité hydroxyle entre 2 et 3, un indice d'hydroxyle d'environ 160-260, et un indice d'acide inférieur à environ 10. Moins de 5 % des groupes OH du polyester sont des ramifications, les autres étant terminaux. Environ 10 à 50 % en poids des monomères utilisés pour obtenir la composition de polyester sont des anhydrides de formule (voir fig. I), où R1 est une chaîne hydrocarbonée non aromatique, saturée ou non, de 6 à 30 atomes de carbone, R2 est un hydrogène ou un groupe hydrocarboné non aromatique, saturé ou non, de 1 à 8 atomes de carbone, R1 et R2 comptant au total entre 8 et 30 atomes de carbone. Le polyester et un réticulant réagissant avec les hydroxyles forment ensemble une composition de revêtement.
Algrim Donald J.
Lewarchik Ronald J.
Smith Marc L.
Zupancic Joseph J.
Morton International Inc.
Ppg Industries Ohio Inc.
Robic
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