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Abstract

[Subject matter] The present invention presents a cationic polymer. When a hair treatment composition containing the cationic polymer is used to damaged hair, excellent conditioning effects are shown. When a skin cosmetic treatment composition containing the cationic polymer, foam formation and foam quality are improved and good use feeling is obtained. [Means to solve problem] The present inventions relates to cation-modified purified galactomannan polysaccharides prepared by purifying a crude galactomannan polysaccharide obtained from albumens of seeds which comprises a main chain composed of mannose units and a side chain composed of galactose units and has mannose to galactose ratio of 4:1 and/or 3:1 to produce purified galactomannan polysaccharide in which the galactomannan content is 80 wt %, and partially substituting hydroxyl groups of the purified galactomannan polysaccharide with a quaternary nitrogen-containing group of Formula (1), wherein a cation charge density derived from the quaternary nitrogen-containing group can be obtained in a specific range, and cosmetic composition containing the same. Chemical formula (1) (where R.sub.1 and R.sub.2 each independently represent an alkyl group having 1 to 3 carbon atoms; R.sub.3 represents an alkyl group having 1 to 24 carbon atoms; X.sup.- represents an anion; n is either 0 or 1 to 30; and, when n is 1 to 30, (R.sub.4O).sub.n represents a polymer residue of an alkylene oxide having 2 to 4 carbon atoms and forms a polyalkylene glycol chain composed of a single alkylene oxide and/or a polyalkylene glycol chain composed of two or more types of alkylene oxide).

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First Claim