NAIL VARNISH COMPOSITION CONTAINING FILM-FORMING GRADIENT COPOLYMER WHICH CONTAINS TWO OR MORE DIFFERENT MONOMERIC UNITS IN COSMETICALLY ACCEPTABLE MEDIUM HAVING EFFECT OF ENABLING FORMATION OF FILM EXHIBITING DESIRABLE ADHESION AND MAINTENANCE DUE TO ELAPSE OF TIME, AND COSMETIC PROCESS FOR MAKING UP AND/OR CARING FOR NAILS USING NAIL VARNISH COMPOSITION

摘要

PURPOSE: A nail varnish composition containing in a cosmetically acceptable medium, film-forming gradient copolymer which contains two or more different monomeric units and exhibits a mass polydispersity index of 2.5 or less is provided. It enables formation of a film exhibiting desirable adhesion and maintenance due to the elapse of time. A cosmetic process for making up and/or caring for the nails is provided together with the application to the nails of the cosmetic composition. CONSTITUTION: The nail varnish composition comprises, in a cosmetically acceptable medium, at least one film-forming gradient copolymer containing two different monomeric units and exhibiting a mass polydispersity index(PI) of 2.5 or less, in which the composition can form a film having an adhesion corresponding to a detachment percentage of less than 45%, measured by ASTM D 3359-7. The gradient copolymer has a weight-average molecular weight of 5,000 to 1,000,000g/mole and a number-average molecular weight of 5,000 to 1,000,000g/mole and contains 1 to 99% by weight of two or more different monomeric units.