| 摘要 |
PURPOSE:A temperature-sensitive copolymer whose cloud point can be set over a wide range of temperature, comprising a copolymer of a specified unsaturated amide compound. CONSTITUTION:An unsaturated amide compound of the formula (wherein R1 is H or methyl, R2 is H or ethyl, R3 is ethyl or propyl, provided that R2 is H and R3 is propyl or both of R2 and R3 are ethyl when R1 is H; and R2 is H and R3 is propyl when R1 is methyl), e.g., N,N-diethylacrylamide or N-n-propylacrylamide, is copolymerized with other monomers (e.g., acrylamide, acrylic acid, or N,N-diethylmethacrylamide). By suitably selecting the monomer, it is possible to control the cloud point (a temperature at which an aqueous solution of the polymer becomes turbid when heated) of the obtained temperature-sensitive copolymer arbitrarily within the range of about -10-110 deg.C.
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