Patent ID: 6136883
Filing Date: 2000-10-24
Classification: B29C,B29K,C08G,C08J,Y10T

Abstract:
A polyester-polyurethane resin produced by a process comprising reacting:a first component that comprises (A) at least one polyisocyanate that has a functionality of 2 to 3 and (B) a peroxide or a peroxide mixture that is able to initiate polymerization by free radicals at a ratio such that: ##EQU6## is 0.5 to 4% by weight, with a second component that comprises:(a) at least one polyol polyester that is prepared from at least one diacid or ethylenically unsaturated anhydride and at least one polyhydric alcohol, and has a hydroxyl group/acid group molar ratio of about 1.3:1 to 2.0:1,(b) at least one ethylenically unsaturated monomer at a ratio such that ##EQU7## is from 10% to 50% by weight, (c) at least one promoter of the decomposition of the catalyst peroxide in the first component at room temperature (20.degree. C.), in an amount of about 0 to 4% by weight with respect to the level of the second component,(d) at least one catalyst of the isocyanate-alcohol reaction, in an amount of from 0 to 4% by weight with respect to the level of the second component, and(e) at least one hydroxylated (alk)acrylate at a ratio such that ##EQU8## is from about 0.1% to 35% by weight, the ratio in moles of the NCO functions in the first component to the sum of the OH functions of components (a) and (e) of the second component being about 0.7 to 1.1, and a weight ratio of the second component to the first component not more than 2.20, and wherein the ethylenically unsaturated monomer (b) is other than hydroxylated (alk)acrylate (e).