The present invention provides a novel polymer which of fers a moist feeling on hair and skin after use. The said polymer comprises the amphoteric monomer represented by general foemula (I) and the cation monomer represented by general formula (II) as the essential constituting monomers.(wherein, R1represents hydrogen atom or methyl, R2and R3each independently represents an alkyl or alkoxy having carbon number of 1 to 4, a cycloalkyl having carbon number of 3 to 6, a phenyl or a -(CH2CH2O)nR7group (n is an integral of 1 to 50, R7represents hydrogen atom, an alkyl or alkoxy having carbon number of 1 to 4, a cycloalkyl having carbon number of 3 to 6 or a phenyl), R4represents an alkylene having carbon number of 1 to 3, A represents an oxygen atom or a NR8group (R8represents hydrogen atom, or an alkyl or alkoxy having carbon cumber of 1 to 4, a phenyl or a -(CH2CH2O)nR9group (n represents an integral of l to 50, R9represents hydrogen atom, an alkyl or alkoxy having carbon number of 1 to 4, a cycloalkyl having carbon number of 3 to 6, or a phenyl), B represents an alkylene having carbon number of 1 to 4)(wherein, R5and R6each independently represent hydrogen atom, or an alkyl or alkoxy having a carbon number of 1 to 4, Y-represents a monovalent inorganic or or ganic anion.)本發明提供一種可於使用後賦予頭髮及皮膚濕潤感之新穎聚合物。該聚合物係以下述通式(I)所示之兩性單體,以及下述通式(II)所示之陽離子性單體作為必要構成單體,(式中,R1為氫原子或甲基,R2及R3各自獨立地為碳數1至4之烷基或烷氧基、碳數3至6之環烷基、苯基或-(CH2CH2O)nR7基(n為1至50之整數、R7示氫原子、碳數1至4之烷基或烷氧基、碳數3至6之環烷基或苯基),R4為碳數1至3之伸烷基,A為氧原子或NR8(R8為氫原子或碳數1至4之烷基或烷氧基、苯基或-(CH2CH2O)nR9基(n為1至50之整數、R9示氫原子、碳數1至4之烷基或烷氧基、碳數3至6之環烷基或苯基))所示之基,B示碳數1至4之伸烷基),(式中,R5及R6各自獨立地為氫原子或碳數1至4之烷基或烷氧基,Y-為1價之無機或有機的陰離子)。
