Antifouling composition, method for its production and article treated therewith

A method for producing an antifouling composition, which comprises a step of polymerizing a monomer mixture comprising from 30 to 70 mass % of the following monomer (a), from 20 to 69 mass % of the following monomer (b) and from 1 to 10 mass % of the following monomer (c), in the presence of a polymerization initiator having an anionic group and/or a chain transfer agent having an anionic group:

• Monomer (a):
• a compound represented by F(CF2)sY—OCOCR═CH2, wherein s is an integer of from 1 to 6, R is a hydrogen atom, a C1-3 alkyl group or a halogen atom, and Y is a C1-10alkylene group,
• Monomer (b):
• a compound represented by CH2═CR1—COO—(R2O)q—R3, wherein R1 is a hydrogen atom or a methyl group, R2 is a C2-4 alkylene group, R3 is a hydrogen atom, a C1-8 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 —(R2O)— present in one molecule may be the same or different from one another,
• Monomer (c):
• a compound represented by CH2═CR4-M-Q-NR5R6 or CH2═CR4-M-Q-N(O)R5R6, wherein R4 is a hydrogen atom or a methyl group, M is —COO— or —CONH—, Q is a C2-4 alkylene group or a C2-3 alkylene group having some or all of hydrogen atoms substituted by hydroxy groups, each of R5 and R6 which are independent of each other, is a benzyl group, a C1-8 alkyl group or a C2-3 alkyl group having some or all of hydrogen atoms substituted by hydroxy groups, or R5, R6 and the nitrogen atom may form a piperidino group or a pyrrolidinyl group, or R5, R6, the oxygen atom and the nitrogen atom may form a morpholino group.