Patent ID: 8013071
Filing Date: 2011-09-06
Classification: C08F,C08G,C09D

Abstract:
1. A process for producing a composition for aqueous coating material, which comprises: reacting a fluorinated copolymer (B) comprising from 40 to 60 mol % of a structural unit of the formula (a1), from 3 to 50 mol % of a structural unit of the formula (a2) and from 4.4 to 37 mol % of a structural unit of the formula (a3) provided that the total mol % value of the respective structural units of the formulae (a1), (a2) and (a3) is from 80 to 100 with a dibasic acid anhydride in an organic solvent to esterify a part of the hydroxyl group in the structural unit of the formula (a3) to introduce a carboxyl group; adding a basic compound to neutralize at least a part of the carboxyl group with the basic compound; adding water; and removing the organic solvent to form the composition for aqueous coating material which comprises water, a synthetic resin dispersed or dissolved in the water, and which contains no organic solvent or an organic solvent in an amount of at most 10 mass % based on the total mass of the composition for aqueous coating material, wherein the synthetic resin comprises a fluorinated copolymer (A) comprising from 40 to 60 mol % of the structural unit of the formula (a1), from 3 to 50 mol % of the structural unit of the formula (a2), from 4 to 30 mol % of the structural unit of the formula (a3) and 1.4 to 6 mol % of a structural unit of the formula (a4) provided that the total mol % value of the respective structural units of the formulae (a1), (a2), (a3) and (a4) is from 80 to 100; wherein the synthetic resin: provided that in the formula (a1), each of X 1 and X 2 which are independent of each other, is a hydrogen atom, a chlorine atom or a fluorine atom, and X 3 is a chlorine atom, a fluorine atom or —CY 1 Y 2 Y 3 , wherein each of Y 1 , Y 2 and Y 3 which are independent of one another, is a hydrogen atom, a chlorine atom or a fluorine atom; provided that in the formula (a2), R a is a hydrogen atom or a methyl group, R 1 is a C 1-12 alkyl group or a C 4-10 monovalent alicyclic group, j is an integer of from 0 to 8, and k is 0 or 1; and provided that in the formula (a3), R b is a hydrogen atom or a methyl group, R 2 is a C 1-10 alkylene group or a C 4-10 bivalent alicyclic group, m is an integer of from 0 to 8, and n is 0 or 1, and provided that in the formula (a4), R b and R 2 are as defined in the formula (a3), respectively, R 3 is a C 2-10 alkylene group or a C 4-10 bivalent alicyclic group, R 4 is a hydrogen atom or —NHZ 1 Z 2 Z 3 , wherein each of Z 1 , Z 2 and Z 3 which are independent of one another, is a hydrogen atom, a C 1-4 alkyl group or a C 1-6 hydroxyalkyl group, provided that at least a part of R 4 is required to be —NHZ 1 Z 2 Z 3 , p is an integer of from 0 to 8, and q is 0 or 1.