HEAT-SEALING ADHESIVE FILM AND CARD-LIKE ARTICLE USING THIS

摘要

PROBLEM TO BE SOLVED: To provide a heat-sealing adhesive film which prevents a thin card-like article, which is a seal molded product of the film, from warping or twisting, without deteriorating the heat-sealing adhesion property of a heat-sealing adhesive layer. SOLUTION: A heat-sealing adhesive film for preparing a card-like article comprises a film-like base material wherein a middle layer (MC layer) and an adhesive layer (HS layer) having a heat-sealing property are formed in this order. The MC layer contains a polyester(PES) having a glass transition temperature(Tg) of from 5 of 120 deg.C and a polyurethane(PU) having a Tg of from -40 to 50 deg.C as crosslinking polymers and a crosslinking agent. Here, the content of the crosslinking agent is at least 4 times as large as the functional group equivalent of the crosslinking polymer, and the weight ratio PES /PU is within the range of from 3/7 to 7/3. The HS layer contains a heat-sealing polymer.