| abstract |
PURPOSE: To improve the solvent resistance of coating and pencil hardness by including a specified polymer binder. n CONSTITUTION: To (A) 100 pts.wt. of a polymer binder consisting of 50-98 wt.% of a β-hydroxy ester copolymer of ethylenic unsaturated monomer obtained by copolymerizing 2-50 wt.% of a hydroxyl functional polyester having a hydroxyl number of 5-200 and a number average molecular weight of 300-30000 with 1-50 wt.% of a β-hydroxyl ester monomer, and the other ethylene monomer, containing no carboxyl group, and cross-linked by ester exchange, an ester exchange catalyst consisting of (B) 1-20 pts.wt. of a catalyst epoxy compound having oxylane functional group and (C) 0.1-10 pts.wt. of an inorganic cation salt consisting of a conjugate base of weak acid with pKa: 2.5-14 or an inorganic salt having an inorganic cation selected from N, K, Li, Ca, and Fe and an inorganic anion selected from halogen, azide, cyanide, and hydroxide is blended. n COPYRIGHT: (C)1990,JPO |