Patent ID: 6380279
Filing Date: 2002-04-30
Classification: C08L,C09D,Y10T

Abstract:
A radiation-curable powder composition, comprising a mixture of at least one semi-crystalline polyester containing end methacryloyl groups and of at least one amorphous polyester containing end methacryloyl groups, said amorphous polyester containing end methacryloyl groups having a degree of end methacrylic unsaturation of 0.17 to 1.5 milliequivalents of double bonds per gram of polyester, these polyesters comprising the reaction products of a glycidyl methacrylate and of a semi-crystalline or amorphous polyester containing end carboxyl groups, the said semi-crystalline polyester containing end carboxyl groups representing(a) a polyester which is the reaction product of (1) an acid constituent which contains (a.1.1) 85 to 100 mol % of terephthalic acid, of 1,4-cyclohexanedicarboxylic acid or of 1,12-dodecanedioic acid and (a.1.2) 0 to 15 mol % of at least one other aliphatic, cycloaliphatic or aromatic di- or polycarboxylic acid having from 4 to 14 carbon atoms; and (2) an alcohol constituent which contains (a.2.1) 85 to 100 mol % of a saturated, straight-chain, aliphatic diol having from 2 to 12 carbon atoms and (a.2.2) 0 to 15 mol % of at least one other aliphatic or cycloaliphatic di- or polyol having from 2 to 15 carbon atoms; or (b) a polyester which is the reaction product of (1) an acid constituent which contains (b.1.1.) 85 to 100 mol % of a saturated, straight-chain, aliphatic dicarboxylic acid having from 4 to 14 carbon atoms and (b.1.2) 0 to 15 mol % of at least one other aliphatic, cycloaliphatic or aromatic di- or polycarboxylic acid having from 4 to 14 carbon atoms, and (2) an alcohol constituent which contains (b.2.1.) 85 to 100 mol % of 1,4-cyclohexanediol or of 1,4-cyclohexanedimethanol and (b.2.2) 0 to 15 mol % of at least one other aliphatic or cycloaliphatic di- or polyol having from 2 to 15 carbon atoms; and the said amorphous polyester containing end carboxyl groups being composed of the(c) reaction product of (1) an acid constituent which contains (c.1.1.) 40 to 100 mol % of terephthalic acid or of isophthalic acid and (c.1.2) 0 to 60 mol % of another aliphatic, cycloaliphatic or aromatic di- or polycarboxylic acid having from 4 to 14 carbon atoms, with (2) an alcohol constituent which contains (c.2.1) 35 to 100 mol % of neopentyl glycol and (c.2.2) 0 to 65 mol % of another aliphatic or cycloaliphatic di- or polyol having from 2 to 15 carbon atoms.