Patent ID: 7431985

Claim:
A medical pressure-sensitive adhesive composition, in which an intermediate composition is cross-linked through the use of a cross-linking agent, wherein the intermediate composition contains an acrylic polymer having a cross-linkable functional group, an acrylic polymer having no cross-linkable functional group and an acrylic oligomer prepared by polymerization of monomers containing 10 to 40 percent by weight of vinyl monomer with a lactam ring, while the number average molecular weight of the acrylic polymer having a cross-linkable functional group is set at a value within the range of 300,000 to 1,500,000, the number average molecular weight of the acrylic oligomer is set at a value within the range of 1,200 to 7,000, the medical pressure-sensitive adhesive composition is made by compounding the acrylic oligomer in the range of 50 to 700 parts by weight relative to 100 parts by weight of the acrylic polymer having a cross-linkable functional group, and the additional amount of the acrylic polymer having no cross-linkable functional group is set at a value within the range of 1 to 50 percent by weight, relative to the whole amount of the medical pressure-sensitive adhesive composition.