Adhesive sheet

Abstract

The present invention provide an adhesive sheet for attaching to a plasticized vinyl chloride resin article such as a blood bag made of a plasticized vinyl chloride resin, and having a center-line surface roughness Ra of 1.0 μm or higher, which comprises a film substrate and a heat-sensitive adhesive layer formed on a backside surface of the film substrate, wherein the heat-sensitive adhesive layer is composed of a resin containing a crystalline polyester resin as a main component. The adhesive sheet of the present invention is excellent in adhesive property when the adhesive sheet is attached to the article made of a plasticized vinyl chloride resin. The adhesive strength of the adhesive sheet of the present invention is not decreased even after an autoclave treatment or a storage at a low temperature. At the result, the adhesive sheet of the present invention does not cause lifting or peeling and is excellent in blocking resistance.

1 . An adhesive sheet for attaching to a plasticized vinyl chloride resin article, which comprises a film substrate and a heat-sensitive adhesive layer formed on a backside surface of the film substrate, wherein the heat-sensitive adhesive layer is composed of a resin comprising a crystalline polyester resin as a main component. 
   
   
       2 . The adhesive sheet as claimed in  claim 1 , wherein a content ratio of the crystalline polyester resin comprised in the resin composing the heat-sensitive adhesive layer is 50 to 100 percent by mass. 
   
   
       3 . The adhesive sheet as claimed in  claim 1 , wherein the resin composing the heat-sensitive adhesive layer is composed of 50 to 100 percent by mass of the crystalline polyester resin and 50 to 0 percent by mass of an amorphous polyester resin. 
   
   
       4 . The adhesive sheet as claimed in  claim 1 , wherein a melting point of the crystalline polyester resin is 50 to 200° C. 
   
   
       5 . The adhesive sheet as claimed in  claim 3 , wherein a glass transition temperature of the amorphous polyester resin is 10 to 90° C. 
   
   
       6 . The adhesive sheet as claimed in  claim 1 , wherein the adhesive sheet is an adhesive sheet for attaching to a plasticized vinyl chloride resin article having a center-line surface roughness Ra of 1.0 μm or higher. 
   
   
       7 . The adhesive sheet as claimed in  claim 6 , wherein the plasticized vinyl chloride resin article is a blood bag made of a plasticized vinyl chloride resin.