Foam waterproofing material with a micro cell structure

Abstract

To be provided is a foam waterproofing material superior in waterproofness and flexible enough to be compatible with further minute clearance. The foam waterproofing material according to the present invention is a waterproofing material including a foam having a thickness of 0.1 to 1.0 mm, characterized in that the foam has a micro cell structure with an average cell diameter of 10 to 60 μm and an apparent density of 0.01 to 0.060 g/cm 3 . In the foam waterproofing material, the repulsive load when compressed to 0.1 mm (0.1 mm-compressive repulsion force) of the foam is preferably 0.01 to 0.1 MPa. The foam preferably has a closed-cell structure or a semi-open- and semi-closed-cell structure. In addition, the foam may have a pressure-sensitive adhesive layer on one or both faces thereof. The pressure-sensitive adhesive layer is preferably formed on the foam via a film layer.

1 - 12 . (canceled) 
     
     
         13 . A method for producing a foam waterproofing material comprising a foam, comprising:
 blending a thermoplastic elastomer, a thermoplastic polymer other than the thermoplastic elastomer and a shrinkage inhibitor;   molding the resulting blend into pellets containing the thermoplastic polymer;   impregnating a high-pressure inert gas in the pellets; and   leaving the resulting polymer under reduced pressure to give a foam.   
     
     
         14 . The method for producing a foam waterproofing material according to  claim 13 , wherein the thermoplastic elastomer is independently selected from the group consisting of olefinic elastomers, styrenic elastomers, thermoplastic polyester elastomers, thermoplastic polyurethane-based elastomers and thermoplastic acrylic elastomers, or combination thereof. 
     
     
         15 . The method for producing a foam waterproofing material according to  claim 13 , wherein the thermoplastic polymer other than the thermoplastic elastomer is independently selected from the group consisting of olefinic polymers, styrenic polymers, polyamides, polyamide-imides, polyurethanes, polyimides, polyether imides, acrylic resins, polyvinyl chlorides, polyvinyl fluorides, alkenyl aromatic resins; polyesters, polycarbonates, polyacetals and polyphenylene sulfides, or combination thereof. 
     
     
         16 . The method for producing a foam waterproofing material according to  claim 13 , wherein the shrinkage inhibitor is a fatty acid bisamide. 
     
     
         17 . The method for producing a foam waterproofing material according to  claim 16 , wherein the fatty acid bisamide is bisamide laurate. 
     
     
         18 . A method for producing a foam waterproofing material comprising a foam, comprising:
 blending a thermoplastic elastomer and a thermoplastic polymer other than the thermoplastic elastomer;   molding the resulting blend into pellets containing the thermoplastic polymer;   impregnating a high-pressure inert gas in the pellets; and   leaving the resulting polymer under reduced pressure to give a foam,   wherein the foam has a thickness of 0.1 to 1.0 mm, a micro cell structure with an average cell diameter of 10 to 60 μm and an apparent density of 0.01 to 0.050 g/cm 3 .   
     
     
         19 . The method for producing a foam waterproofing material according to  claim 18 , wherein the thermoplastic elastomer is independently selected from the group consisting of olefinic elastomers, styrenic elastomers, thermoplastic polyester elastomers, thermoplastic polyurethane-based elastomers and thermoplastic acrylic elastomers, or combination thereof. 
     
     
         20 . The method for producing a foam waterproofing material according to  claim 18 , wherein the thermoplastic polymer other than the thermoplastic elastomer is independently selected from the group consisting of olefinic polymers, styrenic polymers, polyamides, polyamide-imides, polyurethanes, polyimides, polyether imides, acrylic resins, polyvinyl chlorides, polyvinyl fluorides, alkenyl aromatic resins; polyesters, polycarbonates, polyacetals and polyphenylene sulfides, or combination thereof. 
     
     
         21 . The method for producing a foam waterproofing material according to  claim 18 , wherein the shrinkage inhibitor is a fatty acid bisamide. 
     
     
         22 . The method for producing a foam waterproofing material according to  claim 21 , wherein the fatty acid bisamide is bisamide laurate. 
     
     
         23 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 13 , is used as a part of a foam sheet material. 
     
     
         24 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 14  is used as a part of a foam sheet material. 
     
     
         25 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 15  is used as a part of a foam sheet material. 
     
     
         26 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 16  is used as a part of a foam sheet material. 
     
     
         27 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 17  is used as a part of a foam sheet material. 
     
     
         28 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 18  is used as a part of a foam sheet material. 
     
     
         29 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 19  is used as a part of a foam sheet material. 
     
     
         30 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 20  is used as a part of a foam sheet material. 
     
     
         31 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 21  is used as a part of a foam sheet material. 
     
     
         32 . A method for waterproofing optical members during a process of producing the optical members, wherein a foam waterproofing material produced by the method according to  claim 22  is used as a part of a foam sheet material.