Copolymer, and composition for eyes
AssigneeNof Corporation
InventorsAyano SASAKI, Hiroko KAWASAKI, Norio IWAKIRI
Life of this patent
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Abstract
A copolymer containing a structural unit derived from a monomer (a) of formula (1a) or a salt thereof and from a monomer (b) of formula (1b) or (2b), having an Mw of 10,000-2,000,000, the molar ratio na:nb being 10:90 to 70:309. (R1 is H or CH3, X is O or NR2, R2 is H or a C1-4 alkyl group, and n=1-4.) (R3 is H or CH3, Y is O or NR4, R4 is H or a C1-4 alkyl group, m is 1-6, there may be a hydroxyl group in a carbon chain, and A is a phosphorylcholine group or a hydroxyl group, and may be H when m=1 or when there is a hydroxyl group in a carbon chain.) (R5 is H or CH3, R6 is a C1-4 alkyl group or an alkylene group that forms a cycling structure together with R5.)
Claims7
A copolymer comprising:
- a constituent unit derived from a monomer (a) represented by a formula (1a) below or a salt thereof;
- and a constituent unit derived from a monomer (b) represented by any one of formulas (1b) and (2b) below:
- wherein, R1 is a hydrogen atom or a methyl group, X is O or NR2 where R2 is H or an alkyl group having 1 to 4 carbon atoms, and n is 1 to 4,
- wherein, R3 is a hydrogen atom or a methyl group, Y is O or NR4 where R4 is H or an alkyl group having 1 to 4 carbon atoms, m is 1 to 6, a carbon chain of the formula (1b) optionally has at least one hydroxyl group, and A is a phosphorylcholine group or a hydroxyl group and optionally is a hydrogen atom only in a case where m is 1 or in a case where the carbon chain has the at least one hydroxyl group,
- wherein R5 is a hydrogen atom or a methyl group, and R6 is an alkyl group having 1 to 4 carbon atoms or an alkylene group having 1 to 4 carbon atoms whose terminal is bonded to R5 to form a cyclic structure,
- wherein
- a molar ratio na:nb between the constituent units is 10:90 to 70:30, na being a molar proportion of the constituent unit derived from the monomer (a) or the salt thereof in the copolymer, nb being a molar proportion of the constituent unit derived from the monomer (b) in the copolymer, and
- a weight average molecular weight of the copolymer is 10,000 to 2,000,000.
Dependencies are inferred from the claim text.