[
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 R1 and R2 each independently represent an
alkyl group having 1 to 3 carbon atoms; R3 represents an
alkyl group having 1 to 24 carbon atoms; X− represents an anion; n is either 0 or 1 to 30; and, when n is 1 to 30, (R4O)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).