Patent ID: 6069216
Filing Date: 2000-05-30
Classification: A61K,A61Q,C08F

Abstract:
A cationic group-containing copolymer characterized in that a viscosity at 25.degree. C. of the solution prepared by incorporating the copolymer in deionized water at a concentration of 0.5 wt. % is in the range of 0.3-20 Pa.multidot.sec. at a shear rate of 1 sec.sup.-1 and in the range of 0.01-5 Pa.multidot.sec.sup.31 1 at a shear rate of 10 sec.sup.-1 and the viscosity at a shear rate of 1 sec.sup.-1 is higher than the viscosity at a shear rate of 10 sec.sup.-1,wherein said cationic group-containing copolymer is obtained by radically polymerizing at least one cationic group-containing vinyl monomer represented by the formula (III) or (IV), at least one hydrophilic, nonionic group-containing vinyl monomer represented by the formula (I) or (II) and at least one cross-linking vinyl monomer containing at least two vinyl groups in the molecular unit thereof as an essential component monomers: ##STR5## wherein R.sup.1 represents a hydrogen atom or methyl group and R.sup.2 and R.sup.3 are identical to or different from each other and each represent a hydrogen atom or a linear or branched alkyl group or alkenyl group of one to four carbon atoms, ##STR6## wherein R.sup.1 has the meaning mentioned above, A.sup.1 and A.sup.2 are identical to or different from each other and each represent a group represented by the formula: --(CH.sub.2).sub.n -- in which n represents an integer of 2-6, and B represents --O-- or --CH.sub.2 -- group, ##STR7## wherein R.sup.1 has the meaning mentioned above, R.sup.4 and R.sup.5 are identical to or different from each other and each represent an alkyl group or alkenyl group of one to four carbon atoms, R.sup.6 represents a hydrogen atom or an alkyl group of one to four carbon atoms, Y represents an --O--, --NH--, or --O--CH.sub.2 CH(OH)-- group, Z represents a linear or branched alkylene group of one to four carbon atoms, and X represents a conjugate base of the acid, a halogen atom or an alkyl sulfate group of one to four carbon atoms, ##STR8## wherein R.sup.7 and R.sup.8 are identical to or different from each other and each represent a hydrogen atom or methyl group, R.sup.9 and R.sup.10 are identical to or different from each other and each represent a hydrogen atom or an alkvl group of one to four carbon atoms, and X has the meaning mentioned above.