Fluorine-type film, laminate employing it and process for producing the laminate

Abstract

A tetrafluoroethylene-ethylene copolymer (ETFE) film, wherein polar groups are present on the surface of the film after a surface treatment, and the surface roughness R a is at most the surface roughness R a of the surface of an untreated film; an ETFE film, wherein polar groups are present on the surface of the film after a surface treatment, and the amount of a weak boundary layer is at most one time of the amount of a weak boundary layer on the surface of an untreated film; a laminate employing such a film having an extremely excellent bonding strength; and a process for producing it with a mass production property.

1 . A surface-treated tetrafluoroethylene-ethylene copolymer film, wherein polar groups are present on the surface of the above-mentioned surface-treated film, and the surface roughness R a  of the surface of the surface-treated film is at most the surface roughness R a  of the surface of an untreated tetrafluoroethylene-ethylene copolymer film.  
     
     
         2 . A surface-treated tetrafluoroethylene-ethylene copolymer film, wherein polar groups are present on the surface of the above-mentioned surface-treated film, and the amount of fluorine atoms present on the surface of an aluminum thin plate obtained by hot-pressing the aluminum thin plate on the surface of the above-mentioned surface-treated film at 100° C. under a surface pressure of 21 kgf/cm 2  for 10 minutes, followed by cooling to room temperature and separation, is at most one time of the amount of fluorine atoms present on the surface of an aluminum thin plate obtained by the above-mentioned hot-pressing of the above-mentioned aluminum thin plate on the surface of a surface-untreated tetrafluoroethylene-ethylene copolymer film, followed by cooling to room temperature and separation.  
     
     
         3 . The tetrafluoroethylene-ethylene copolymer film according to  claim 1  or  2 , wherein hydroxyl groups and/or carbonyl groups are present as the polar groups.  
     
     
         4 . A laminate which comprises a substrate and the tetrafluoroethylene-ethylene copolymer film as defined in  claim 1  or  2  laminated on the above-mentioned substrate so that the surface of the surface-treated film faces said substrate.  
     
     
         5 . The laminate according to  claim 4 , which further has an adhesive for lamination between the above-mentioned substrate and the above-mentioned tetrafluoroethylene-ethylene copolymer film, wherein the above-mentioned substrate and the above-mentioned tetrafluoroethylene-ethylene copolymer film are bonded with each other by the above-mentioned adhesive.  
     
     
         6 . The laminate according to  claim 5 , wherein the above-mentioned adhesive is an adhesive which contains a thermoplastic polyester resin component as the main component.  
     
     
         7 . A process for producing a laminate, which comprises laminating a tetrafluoroethylene-ethylene copolymer film having an RF bombard treatment or a DC bombard treatment applied to its surface, with another substrate, by a dry lamination method.  
     
     
         8 . The process for producing a laminate according to  claim 7 , which comprises coating an adhesive for lamination on a tetrafluoroethylene-ethylene copolymer film having an RF bombard treatment or a DC bombard treatment applied to its surface, followed by drying the above-mentioned adhesive, and bonding another substrate and the above-mentioned surface-treated tetrafluoroethylene-ethylene copolymer film by the above-mentioned adhesive for lamination by a dry lamination method.  
     
     
         9 . The process for producing a laminate according to  claim 8 , wherein the above-mentioned adhesive is an adhesive which contains a thermoplastic polyester resin component as the main component.  
     
     
         10 . The process for producing a laminate according to  claim 8 , wherein the above-mentioned bombard treatment is a bombard treatment utilizing a gas which makes polar groups be present on the surface of the film having the bombard treatment applied thereto.