Patent ID: 6040009
Filing Date: 2000-03-21
Classification: B05D,C09D

Abstract:
A low organic solvent content resin composition comprising:(1) a polyester oligomer, which is a star oligomer or a star burst oligomer prepared by an addition reaction, having a hydroxy group in an amount of 2.0 to 10.0 moles/Kg-resin, a number average molecular weight (Mn) of 300 to 1500, a weight average molecular weight (Mw) of 300 to 3000, and a ratio of a weight average molecular weight/a number average molecular weight (Mw/Mn) of 1.0 to 2.0, an amount of a modifying lactone being 31 to 85%, and an aliphatic hydrocarbon group having 4-22 carbon atoms derived from the group consisting of a monoepoxy compound, a hydroxy acid and an aliphatic acid;said addition reaction being carried out such that:(i) one mole of a polyol having 3 to 6 hydroxyl groups is reacted with 0.3 to 1.5 mole of an acid anhydride, then with 2 to 10 moles of a lactone, and then with 0.3 to 1.5 mole of a monoepoxy compound: or(ii) one mole of a polyol having 3 to 6 hydroxyl grouns is reacted with 0.3 to 1.5 mole of an acid anhydride, then with 0.3 to 1.5 mole of a monoepoxy compound, and then with 2 to 10 moles of a lactone: or(iii) one mole of a polyol having 3 to 6 hydroxyl groups is reacted with 2 to 10 moles of a lactone, then with 0.3 to 1.5 mole of an acid anhydride, and then with 0.3 to 1.5 mole of a monoepoxy compound, orsaid addition reaction being carried out such that:one mole of a polyepoxy compound having 3 to 6 epoxy groups is reacted with 2 to 6 moles of a hydroxy acid or an aliphatic acid, and then with 2 to 10 moles of a lactone;(2) a curing agent reactive with a hydroxyl group of said polyester oligomer;and wherein the content of an organic solvent is 5 to 40%.