| 摘要 |
PURPOSE:To eliminate the stimuli to the skin and to obviate the degradation in tacky adhesiveness even after long-term use by forming an adhesive agent layer essentially consisting of a copolymer consisting of specific ratios of the alkyl ester monomer of acrylic acid or methacrylic acid, alkoxyl-contg. ethylenic unsatd. monomer and carboxyl-contg. ethylenic unsatd. monomer. CONSTITUTION:The pressure-sensitive adhesive agent layer 2 of the patch material formed by providing the lay 2 on one surface of a base material film 1 is essentially composed of the copolymer consisting of 40 to 80wt.% the alkyl ester monomer of the acrylic acid or methacrylic acid, 10 to 50wt.% alkoxyl- contg. ethylenic unsatd. monomer and 1 to 10wt.% carboxyl group-contg. ethylenic unsatd. monomer. The glass transition point of the copolymer is <=250 deg.K and the gel fraction of the copolymer after drying is >=25%. Materials, such as polyether urethane, polyester urethane, polyether polyamide block polymer, and polyacrylate, which have good water vapor transmittability, are adequately used as the base material film 1. |
