Patent ID: 8598291

Claim:
An antifouling composition comprising a fluorocopolymer which comprises from 30 to 70 mass % of polymerized units (a′) based on the following monomer (a), from 20 to 69 mass % of polymerized units (b′) based on the following monomer (b) and from 1 to 10 mass % of polymerized units (c′) based on the following monomer (c), and which has anionic groups at its main chain terminals: monomer (a): a compound represented by F(CF 2 ) s Y—OCOCR═CH 2 , wherein s is an integer of from 1 to 6, R is a hydrogen atom, a C 1-3 alkyl group or a halogen atom, and Y is a C 1-10 alkylene group, monomer (b): a compound represented by CH 2 ═CR 1 —COO—(R 2 O) q —R 3 , wherein R 1 is a hydrogen atom or a methyl group, R 2 is a C 2-4 alkylene group, R 3 is a hydrogen atom, a C 1-8 alkyl group, a (meth)acryloyl group or a glycidyl group, q is an integer of from 1 to 140, and when q is from 2 to 140, the plurality of —(R 2 O)— present in one molecule may be the same or different from one another, monomer (c): a compound represented by CH 2 ═CR 4 -M-Q-NR 5 R 6 or CH 2 ═CR 4 -M-Q-N(O)R 5 R 6 , wherein R 4 is a hydrogen atom or a methyl group, M is —COO— or —CONH—, Q is a C 2-4 alkylene group or a C 2-3 alkylene group having some or all of hydrogen atoms substituted by hydroxy groups, each of R 5 and R 6 which are independent of each other, is a benzyl group, a C 1-8 alkyl group or a C 2-3 alkyl group having some or all of hydrogen atoms substituted by hydroxy groups, or R 5 , R 6 and the nitrogen atom may form a piperidino group or a pyrrolidinyl group, or R 5 , R 6 , the oxygen atom and the nitrogen atom may form a morpholino group.