POLYMERE SEQUENCE A GROUPEMENTS ALCOXYSILANE ET SON UTILISATION EN COSMETIQUE

• Main Author: LION BERTRAND
• Format: Patent
• Language: French
• Published: 12.01.2018
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; HUMAN NECESSITIES; HYGIENE; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MEDICAL OR VETERINARY SCIENCE; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to a cosmetic process for caring for or making up keratin materials, comprising: either the topical application to the keratin materials of an anhydrous mixture of a cosmetic composition comprising a maleic anhydride block polymer and of an amino alkoxysilane compound; or the sequential application to the keratin materials of an anhydrous cosmetic composition comprising a maleic anhydride block polymer and of an anhydrous cosmetic composition containing an amino alkoxysilane, said block polymer comprising: a first block with a glass transition temperature (Tg) of greater than or equal to 40° C., obtained from a monomer CH2═C(R1)-COOR2 in which R1═H or methyl, R2═C4 to C12 cycloalkyl group; and a second block with a glass transition temperature (Tg) of less than or equal to 20° C. derived from a maleic anhydride monomer and from a monomer CH2═C(R1)-COOR3 in which R1═H or methyl, R3=linear or branched C1 to C6 unsubstituted alkyl group, with the exception of a tert-butyl group, or a methoxyethyl group. The invention also relates to the polymer bearing an alkoxysilane group obtained by reacting said block polymer with said amino alkoxysilane. The process makes it possible to obtain a non-tacky and transfer-resistant film-forming deposit that has good persistence and that is resistant to water, to oil and to sebum.