Patent ID: 7790794

Claim:
A composition for aqueous coating material, which comprises water and a synthetic resin dispersed or dissolved therein, wherein the synthetic resin contains a fluorinated copolymer (A) 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), from 4 to 30 mol % of a structural unit of the formula (a3) and to 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; and which contains no organic solvent or an organic solvent in an amount of at most 10 mass % in the total mass of the composition for aqueous coating material: —CFX 1 —CX 2 X 3 — Formula (a1) 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; 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.