Kao Corporation

Kazuhisa Fukuhara

Takashi Kodate

Kenichi Ueyama

Shuichiro Kobaru

Kayoko Kitada

Kiyotake Tada

Tadanori Yoshimura

Akira Fujiu

Tetsuya Kawai

Michiko Tada

Masanori Takai

Tomoyuki Suzawa

Masayoshi Ehara

Yoshihisa Kitano

Noriko Tejima

Nozomi Nagashima

Hiroyuki Terasaki

Takao Shinozaki

There is provided an organopolysiloxane which is excellent in extensibility as well as solubility and dispersibility in water and lower alcohols. There is provided an organopolysiloxane with a poly(N-acylalkyleneimine) segment having a repeating unit represented by the following general formula (1): wherein Rrepresents a hydrogen atom or an alkyl group, an aralkyl group, or an aryl group each having 1 to 22 carbon atoms, and n is 2 or 3, wherein the segment is bound to each of at least two silicon atoms of an organopolysiloxane segment as a main chain via an alkylene group containing a hetero atom, and wherein the number-average molecular weight of the segment is 800 to 1600, the mass ratio of the organopolysiloxane segment as a main chain and the poly(N-acylalkyleneimine) segment is 65/35 to 82/18, and the weight-average molecular weight of the organopolysiloxane segment as a main chain is 10,000 to 100,000.

Organopolysiloxane

A hair styling method, including the steps of: via respective alkylene groups each containing a hetero atom,

Hair styling method

A hair cosmetic composition comprising components (A) and (B) at a mass ratio of (A)/(B)=0.66 to 9.0: (A) an organopolysiloxane wherein poly(acylalkyleneimine) segments each having a molecular weight of from 1,200 to 5,500 are bound to an organopolysiloxane segment having a molecular weight of from 7,000 to 100,000, the mass ratio of the both segments is from 35/65 to 60/40, and the organopolysiloxane segment between the above-mentioned bonds has a molecular weight of from 1,300 to 5,500, (B) an organopolysiloxane wherein poly(acylalkyleneimine) segments each having a molecular weight of from 800 to 1,600 are bound to an organopolysiloxane segment having a molecular weight of from 10,000 to 100,000, the mass ratio of the both segments is from 65/35 to 82/18, and the organopolysiloxane segment between the above-mentioned bonds has a molecular weight of from 1,500 to 3,500.

Hair cosmetic

The present invention provides an organopolysiloxane obtained by binding, to at least two silicon atoms of an organopolysiloxane segment constituting a main chain, a poly(N-acylalkyleneimine) segment composed of a repeating unit represented by the following formula (1): wherein Rrepresents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms and n is 2 or 3, via an alkylene group containing a hetero atom, wherein the poly(N-acylalkyleneimine) segment has a number-average molecular weight of from 1,600 to 3,500; a mass ratio (a/b) of the organopolysiloxane segment (a) constituting the main chain to the poly(N-acylalkyleneimine) segment (b) (which will hereinafter be called 'mass ratio (a/b)', simply) is from 42/58 to 58/42; the organopolysiloxane segment between two poly(N-acylalkyleneimine) segments adjacent to each other has a weight-average molecular weight of from 1,600 to 3,500; and the organopolysiloxane segment constituting the main chain has a weight-average molecular weight of 7,000 to 100,000.

A hair processing composition contains an alkoxysilane (1); an organic acid; and water and has a pH in a range of from 2 to 5. A method for processing hair includes mixing while stirring the above-described hair processing composition and allowing a silanol compound (2) produced through hydrolysis of the alkoxysilane (1) represented by general formula (1) to penetrate into the hair. A method for processing hair further includes applying to hair an acidic aqueous solution or an alkaline aqueous solution after the silanol compound (2) has penetrated into the hair to accelerate the polymerization of the silanol compound.RSi(OR)&#x2003;&#x2003;(1)RSi(OH)(OR)&#x2003;&#x2003;(2)wherein Rand Rrepresent a C-Calkyl group or a C-Calkenyl group, p represents an integer of from 0 to 3, and n represents an integer of not less than 1 and not more than (4&#x2212;p).

Hair-treating agent and methods of treating hair

A leave-on hair cosmetic composition, which contains the following components (A) and (B):

Hair cosmetic composition

A leave-on hair cosmetic composition, which contains the following components (A), (B) and (C): wherein the cosmetic composition has a pH of from 2 to 5 at 25&#xb0; C. when diluted to 20 times the weight with water. The present invention also relates to a hair quality improving method which includes treating the hair with the hair cosmetic composition. The hair cosmetic composition of the present invention can provide benefits such as luster, manageability, pliability and elasticity to the hair which is apt to be dry, having lost water therefrom owing to damage by coloring, permanent waving, or repetitive excessive blow drying.

The present invention provides a method for the easy preparation of a mixture comprising betaine alkyl ester which gives good softness, smoothness and oily feeling to hair. Thus, according to the present invention, a specific monohalogen carboxylic acid alkyl-ester is made to react with a specific tertiary amine using a specific long-chain alcohol as a reaction solvent and, after a specific betaine alkyl ester is obtained, the excessive above-mentioned tertiary amine is removed whereupon a mixture comprising the said long-chain alcohol and the said betaine alkyl ester is obtained.

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Sumida-ku, Japan

Kazuhisa Fukuhara