Copolymer of allyl monomer containing polar group

A copolymer of polar group-containing allyl monomers, which is a copolymer containing only the monomer units represented by formulae (3-1), (4-1) and (4-2)

• in the formulae, R1-1 represents a hydrogen atom or methyl group;
• and n, m1 and m2 represent the molar ratio of each of the monomer units;
• (A) the main chain has one or less branch, which has two or more carbon atoms, per 1000 carbon atoms which constitute the main chain;
• and
• (B) the main chain has a carbon-to-carbon double bond at least at one end of the main chain.

A copolymer of polar group-containing allyl monomers, which is a copolymer containing only the monomer units represented by formulae (3-1), (4-1) and (4-2)

• in the formulae, R1-1 represents a hydrogen atom or methyl group;
• and n, m1 and m2 represent the molar ratio of each of the monomer units;
• (A) the main chain has one or less branch, which has two or more carbon atoms, per 1000 carbon atoms which constitute the main chain;
• and
• (B) the main chain has a carbon-to-carbon double bond at least at one end of the chain;
• wherein the copolymer further has a structure that:
• (C) the number average molecular weight in terms of polystyrene (Mn) is 1,000 or more and 1,000,000 or less;
• (D) the molecular weight distribution (Mw/Mn) is 1.0 or more and 3.0 or less;
• and
• (E) n, m1 and m2 representing the molar ratio of the monomer units represented by formulae (3-1), (4-1) and (4-2) satisfy the following formula:
• 0.1≦{(m1+m2)/(m1+m2+n)}×100≦50.