Heat-hardenable paint compositions

Details Heat-hardenable paint compositions Heat-hardenable paint compositions

C - Chemistry, Metallurgy

09

D

C09D 201/06 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01) C09D 163/00 (2006.01)

Patent

CA 2258302

To obtain paint compositions with which it is possible to form paint films which have excellent acid resistance, weather resistance and heat resistance and which also have excellent yellowing resistance. A heat hardenable paint composition which contains (A) polyol which has in each molecule two or more sterically protected secondary hydroxyl groups, being polyol obtained by means of an esterification reaction of an epoxy group containing compound which has one epoxy group and which does not have a polymerizable unsaturated bond and a carboxyl group containing compound which has two or more carboxyl groups; and (B) 1,3,5-triazine-2,4,6-tris-carbamic acid ester which can be represented by the general formula C3N3(NHCOOR)3 or an oligomer thereof, wherein the mol ratio secondary hydroxyl groups originating from the aforementioned (A) component : NHCOOR groups originating from the aforementioned (B) component in the composition is from 1:3 to 3:1. (In said formula, R represents an alkyl group which has from 1 to 20 carbon atoms, an aryl group which has from 6 to 20 carbon atoms or an aralkyl group which has from 7 to 20 carbon atoms.)

L'invention concerne des compositions de peinture qui permettent de former des films de peinture présentant une excellente résistance à l'acide, aux intempéries, à la chaleur, et au jaunissement. L'invention traite d'une composition de peinture thermodurcissable qui contient (A) du polyol présentant dans chaque molécule deux ou plusieurs groupes hydroxyle secondaires à protection stérique. Il s'agit d'un polyol obtenu par une réaction d'estérification d'un groupe époxy contenant un composé qui comporte un groupe époxy et qui ne possède pas de liaison polymérisable non saturée et un groupe carboxyle contenant un composé qui possède deux ou plusieurs groupes carboxyle; et (B) un ester d'acide 1,3,5-triazine-2,4,6-tris-carbamique qui peut être représenté par la formule générale C¿3?N¿3?(NHCOOR)¿3?, ou un oligomère de ce dernier, où le rapport molaire des groupes hydroxyle secondaires provenant du composant (A) susmentionné: groupes NHCOOR provenant du composant (B) susmentionné dans la composition, se situe entre 1/3 et 3/1. Dans cette formule, R représente un groupe alkyle qui présente entre 1 et 20 atomes de carbone, un groupe aryle qui comporte entre 6 et 20 atomes de carbone ou un groupe aralkyle qui possède entre 7 et 20 atomes de carbone.

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