Multilayer film, laminate, airbag, and method of manufacturing laminate

Abstract

A multilayer film, which is used upon being adhered to a fabric, includes an adhesive layer to be a side of the multilayer film to be adhered to the fabric; and a barrier layer bonded to the adhesive layer. Each of the adhesive layer and the barrier layer includes a thermoplastic polyester elastomer. A melting point of the barrier layer is higher than a melting point of the adhesive layer. A ratio value of a content ratio of a soft segment in the thermoplastic polyester elastomer in the adhesive layer with respect to a content ratio of a soft segment in the thermoplastic polyester elastomer in the barrier layer, is 5 or less.

What is claimed is: 
     
         1 . A multilayer film used upon being adhered to a fabric, the multilayer film comprising:
 an adhesive layer to be a side of the multilayer film to be adhered to the fabric; and   a barrier layer bonded to the adhesive layer, wherein   the adhesive layer and the barrier layer include a thermoplastic polyester elastomer, and   a melting point of the barrier layer is higher than a melting point of the adhesive layer.   
     
     
         2 . The multilayer film according to  claim 1 , wherein the thermoplastic polyester elastomer included in the adhesive layer is a block copolymer including a soft segment including polyether and a hard segment including polyester. 
     
     
         3 . The multilayer film according to  claim 1 , wherein the melting point of the barrier layer is higher than the melting point of the adhesive layer by more than 20° C. 
     
     
         4 . The multilayer film according to  claim 1 , wherein the fabric includes polyester. 
     
     
         5 . The multilayer film according to  claim 1 , wherein the fabric is a fabric used for an airbag. 
     
     
         6 . A laminate formed by adhering the multilayer film according to  claim 1  and the fabric to each other. 
     
     
         7 . An airbag formed by using the laminate according to  claim 6 , wherein
 the fabric is formed to have a shape of a bag, and   the multilayer film is formed on a surface of the fabric.   
     
     
         8 . A method of manufacturing a laminate including the multilayer film according to  claim 1  and the fabric, the method comprising:
 a step of adhering the side of the multilayer film with the adhesive layer to the fabric, while heating the multilayer film at a temperature below the melting point of the barrier layer.