| 摘要 |
PURPOSE: Provided are new polymers, to a process for making them and to coating compositions containing them, especially thermosetting acrylic gel coat compositions. Gel coat compositions containing such polymers possess improved rheological properties and may be used to create durable in-mold coatings for articles requiring good hydrolytic stability and UV resistance. CONSTITUTION: One aspect of the present invention is a polymer for making coating compositions, and especially gel coat compositions, represented by the formula W-(X) -(Y) -H (I) wherein, X is a divalent saturated aliphatic group having a pendant ester group without any polymerizable double bonds, Y is a divalent saturated aliphatic group having a pendant group of formula -CO-O-R1-O-CO-R2 (IA) in which R1 is a divalent, aliphatic, saturated, hydroxyl-containing group and R2 is a hydrocarbyl group with at least one polymerizable carbon-carbon double bond, W is an end group derived from a mercaptan of the general formula R3-SH in which R3 is a hydrocarbyl group having 2 to 20 carbon atoms and not having a polymerizable carbon-carbon double bond, m is a number in the range from 1 to 10, n is a number in the range from 1 to 50, n/m is in the range from about 1 to 5 ; and the polymer has a number average molecular weight of at least 2,500. |
