COPOLYMER FOR COSMETICS, SURFACE TREATMENT AGENT FOR COSMETIC POWDER, POWDER FOR COSMETICS, AND COSMETIC PREPARATION

摘要

The purpose of the present invention is to provide: a copolymer for cosmetics, which has excellent water repellency and oil repellency even though a polyfluoroalkyl group therein has 6 or less carbon atoms; a surface treatment agent which contains the copolymer for cosmetics; a powder for cosmetics, which is treated with the surface treatment agent and has excellent water repellency and oil repellency; and a cosmetic preparation which contains the powder for cosmetics. A copolymer for cosmetics of the present invention contains: 70-90% by mass of a constituent unit (A) that is derived from a compound represented by formula (a); 2-25% by mass of a constituent unit (B) that is derived from a compound represented by formula (b); 2-25% by mass of a constituent unit (C) that is derived from a compound represented by formula (c); 0.1-10% by mass of a constituent unit (D) that is derived from a compound represented by formula (d); and a residue (E) of a chain-transfer agent (e) that contains an OH group or a COOH group.;CH2═CR1—COO-Q1-Rf  (a);CH2═CR2-Q2-COOH  (b);CH2═CR3—COO—(R4O)n-R5  (c);CH2═CR7—COO-Q3-P(O)(OH)—R8  (d)

主权项

1. A copolymer, comprising:
70 to 90 wt % of a constituent unit (A) derived from a compound represented by formula (a) shown below; 2 to 25 wt % of a constituent unit (B) derived from a compound represented by formula (b) shown below; 2 to 25 wt % of a constituent unit (C) derived from a compound represented by formula (c) shown below; 0.1 to 10 wt % of a constituent unit (D) derived from a compound represented by formula (d) shown below; and a residue (E) of an OH group- or COOH group-comprising chain transfer agent (e),
CH2═CR1—COO-Q1-Rf  (a) where Q1 is a single bond or a divalent linking group; R1 is a hydrogen atom or a methyl group; and Rf is a polyfluoroalkyl group comprising 1 to 6 carbon atoms or a polyfluoroether group,
CH2═CR2-Q2-COOH  (b) where Q2 is a single bond or a divalent linking group; and R2 is a hydrogen atom, a methyl group or a COOH group,
CH2═CR3—COO—(R4O)n-R5  (c) where R3 is a hydrogen atom or a methyl group; each R4 is independently an alkylene group comprising 2 to 4 carbon atoms in which a part or all of hydrogen atoms is optionally substituted with OH groups; n is a number of from 1 to 300; R5 is a hydrogen atom, an alkyl group comprising 1 to 4 carbon atoms or a group represented by formula (s):
—CO—CR6═CH2  (s), where R6 is a hydrogen atom or a methyl group,CH2═CR7—COO-Q3-P(O)(OH)—R8  (d) where Q3 is a single bond or a divalent linking group; R7 is a hydrogen atom or a methyl group; R8 is an OH group or a group represented by formula (t):
-Q4-OCO—CR9═CH2  (t), where Q4 is a single bond or a divalent linking group; and R9 is a hydrogen atom or a methyl group.