Precursor composition for crosslinkable pressure-sensitive adhesive for skin

Abstract

A composition for production of a crosslinkable pressure-sensitive adhesive for skin, obtained by dissolving in a solvent 100 parts by weight of an acrylic copolymer (copolymer A) comprising a (meth)acrylic acid alkyl ester as the main constituent component and 3-45 wt % diacetoneacrylamide as an essential constituent component, and containing no free carboxyl groups, and 0.1-30 parts by weight of an acrylic copolymer (copolymer B) comprising a (meth)acrylic acid alkyl ester as the main constituent component and a primary amino group and/or carboxyhydrazide group on a side chain, and containing no free carboxyl groups.

What is claimed is: 
     
         1 . A precursor composition for a crosslinkable pressure-sensitive adhesive for skin, comprising:
 i) an acrylic copolymer (copolymer A) comprising a (meth)acrylic acid alkyl ester as the main constituent component and 3-45 wt % diacetone acrylamide as an essential constituent component, and containing no free carboxyl groups, and   ii) an acrylic copolymer (copolymer B) comprising a (meth)acrylic acid alkyl ester as the main constituent component and a primary amino group on a side chain, and containing no free carboxyl groups, wherein the primary amino group is present at a density of at least 2 per molecule of copolymer B and the primary amino group and/or carboxyhydrazide group in copolymer B is included at a density of one per 5-100 molecules of (meth)acrylic acid ester comonomer in copolymer B, wherein the molecular weight of copolymer B is at least 2000;   wherein the proportion by weight of copolymer B with respect to polymer A is 0.1-30:100, and wherein copolymers A and B are dissolved in a solvent.   
     
     
         2 . A precursor composition according to  claim 1 , wherein the solvent contains acetone and/or butanone, and the amount of acetone and/or butanone is at least 5.0 wt % with respect to the total amount of solvent. 
     
     
         3 . A precursor composition according to  claim 1 , wherein the solvent contains acetone and/or butanone, and the amount of acetone and/or butanone is 5.0-30 wt % with respect to the total amount of the solvent.