Patent ID: 7847047

Claim:
A thermoresponsive polymer obtained by polymerizing the monomer represented by a formula (1) wherein R 1 is hydrogen or methyl, wherein when R 1 is hydrogen, R 2 is carbamoyl, or at least one group selected from the class consisting of methyl, ethyl, propyl, butyl, pentyl, hexyl, cyclopentyl, cyclohexyl, cycloheptyl, methoxy, ethoxy, propoxy, butoxy, pentyloxy and hexyloxy, wherein one or more hydrogen atoms are substituted by carbamoyl; or wherein when R 1 is methyl, R 2 is carbamoyl, or at least one group selected from the class consisting of methyl, propyl, butyl, pentyl, hexyl, cyclopentyl, cyclohexyl, cycloheptyl, methoxy, ethoxy, propoxy, butoxy, pentyloxy and hexyloxy, wherein one or more hydrogen atoms are substituted by carbamoyl.