Patent ID: 8557939

Claim:
An antifouling composition comprising a fluorocopolymer which comprises from 30 to 65 mass % of polymerized units (a) based on the following monomer (a), from 1 to 67 mass % of polymerized units (b1) based on the following monomer (b1) and from 3 to 34 mass % of polymerized units (b2) based on the following monomer (b2), wherein the content of —(C 2 H 4 O)— is from 20 to 65 mass %, and the content of —(C 4 H 8 O)— is from 2 to 13 mass %: monomer (a): a compound represented by (Z—Y) n X, wherein Z is a C 1-6 perfluoroalkyl group or a monovalent group represented by C m F 2m+1 O(CFWCF 2 O) d CFK— wherein m is an integer of from 1 to 6, d is an integer of from 0 to 4, and each of W and K which are independent of each other, is a fluorine atom or a trifluoromethyl group, Y is a bivalent organic group or a single bond, n is 1 or 2, when n is 1, X is —CR═CH 2 , —COOCR═CH 2 , —OCOCR═CH 2 , —OCH 2 -φ-CR═CH 2 or —OCH═CH 2 , and when n is 2, X is —CH[—(CH 2 ) p CR═CH 2 ]—, —CH[—CH 2 ) p COOCR═CH 2 ]—, —CH[—(CH 2 ) p OCOCR═CH 2 ]—or —OCOCH═CHCOO—, R is a hydrogen atom, a methyl group or a halogen atom, φ is a phenylene group, and p is an integer of from 0 to 4, monomer (b1): a compound represented by CH 2 ═CR 1 -G 1 -(C 2 H 4 O) q1 —R 2 , monomer (b2): a compound represented by CH 2 ═CR 3 -G 2 -(C 2 H 4 O) q2 —(C 4 H 8 O) q3 —R 4 , wherein each of R 1 , R 2 , R 3 and R 4 which are independent of one another, is a hydrogen atom or a methyl group, each of q1 and q3 which are independent of each other, is an integer of from 1 to 50, q2 is an integer of from 1 to 50, each of G 1 and G 2 which are independent of each other, is —COO(CH 2 ) r — or —COO(CH 2 ) t —NHCOO— wherein r is an integer of from 0 to 4, and t is an integer of from 1 to 4.