PROBLEM TO BE SOLVED: To obtain a water-soluble polymer among those exhibiting various solution thermal behaviors by free radical-initiated polymerization between a macromonomer having polymerizable terminal group, specific hydrophilic segment and specific hydrophobic segment and a specific olefinically unsaturated comonomer.SOLUTION: This water-soluble polymer is obtained by free radical-initiated polymerization between (A) a macromonomer having polymerizable terminal group, polyalkylene oxide-based hydrophilic segment and hydrophobic segment having hydrogen or (un)saturated linear or branched, aliphatic, alicyclic or aromatic 1-30C hydrocarbon group, e.g. an ester of (meth)acrylic acid and a 10-18C aliphatic alcohol polyglycol ether having eight EO units and (B) an olefinically unsaturated comonomer having oxygen, nitrogen, sulfur, phosphorus, chlorine and/or fluorine atom(s), e.g. acrylamidopropylmethylenesulfonic acid.COPYRIGHT: (C)2001,JPO【課題】 色々な溶液熱挙動を示す沢山の新規ポリマーの提供。【解決手段】 A)重合性末端基、ポリアルキレンオキシドをベースとする親水性部分および水素または飽和または不飽和の線状のまたは枝分かれした脂肪族、脂環式または芳香族(C1 ~C30)炭化水素基を有する疎水性部分を有する1種類以上のマクロモノマー、およびB)酸素、窒素、硫黄、燐、塩素および/または弗素を含有する1種類以上のオレフィン性不飽和コモノマーを遊離基開始重合することによって製造できる水溶性ポリマー。
