Elastic Composite Film and Composite Fabric and Production Process Thereof

Abstract

An elastic composite film provided with a sintered ePTFE film and an elastomeric resin layer, produced by continuously forming the elastomeric resin layer on at least one side of the sintered ePTFE film, continuously elongating the resulting multilayer film at less than the yield point of the expanded, sintered, porous film and at an elongation factor of 1.3 times or more in the biaxial directions, or in the uniaxial direction without contracting in the direction perpendicular to the direction of elongation, and relaxing the resulting elongated multilayer film, wherein when the composite film is elongated by 10% in the longitudinal and/or transverse direction, the tensile stress of the composite film is 2.5 N/15 mm or less, and/or the elongation percentage of the composite film in the longitudinal and/or transverse direction is 30% or more and the elongation recovery rate is 70% or more.

1 . An elastic composite film provided with an expanded, sintered, porous film substantially consisting of polytetrafluoroethylene and an elastomeric resin layer formed on at least one side of the expanded, sintered, porous film; wherein, when the composite film is elongated by 10% in the longitudinal and/or transverse direction, the tensile stress of the composite film is 2.5 N/15 mm or less, and/or the elongation percentage of the composite film in the longitudinal and/or transverse direction is 30% or more and the elongation recovery rate is 70% or more. 
     
     
         2 . The elastic composite film according to  claim 1 , wherein the elastomeric resin layer contains a polyurethane resin. 
     
     
         3 . An elastic composite fabric comprising an elastic cloth laminated onto one or both sides of a composite film provided with an expanded, sintered, porous film substantially consisting of polytetrafluoroethylene and an elastomeric resin layer formed on at least one side of the expanded, sintered, porous film; wherein, when the composite fabric is elongated by 10% in the longitudinal and/or transverse direction, the tensile stress of the composite fabric is 2.5 N/15 mm or less, and/or the elongation percentage of the composite fabric in the longitudinal and/or transverse direction is 30% or more and the elongation recovery rate is 70% or more. 
     
     
         4 . The elastic composite fabric according to  claim 3 , wherein the elastomeric resin layer contains a polyurethane resin. 
     
     
         5 . A textile product comprising an elastic composite fabric according to  claim 3 . 
     
     
         6 .- 10 . (canceled) 
     
     
         11 . An elastic composite film provided with an expanded, sintered, porous film and an elastomeric layer produced by continuously forming an elastomeric layer on at least one side of an expanded, sintered, porous film substantially consisting of polytetrafluoroethylene, continuously elongating the resulting multilayer film at less than the yield point of the expanded, sintered, porous film and at an elongation factor of 1.3 times or more in the biaxial directions, or in the uniaxial direction without contracting in the direction perpendicular to the direction of elongation, and relaxing the resulting elongated multilayer film; wherein, when the composite film is elongated by 10% in the longitudinal and/or transverse direction, the tensile stress of the composite film is 2.5 N/15 mm or less, and/or the elongation percentage of the composite film in the longitudinal and/or transverse direction is 30% or more and the elongation recovery rate is 70% or more. 
     
     
         12 . A composite fabric provided with an expanded, sintered, porous film, an elastomeric resin layer and an elastic cloth, produced by a process comprising the steps of:
 (1) continuously forming the elastomeric resin layer on at least one side of the expanded, sintered, porous film substantially consisting of polytetrafluoroethylene;   (2) continuously laminating the elastic cloth onto one or both sides of the multilayer film obtained in (1) above, and continuously elongating the laminated fabric obtained in the lamination step at less than the yield point of the expanded, sintered, porous film and at an elongation factor of 1.3 times or more in the biaxial directions, or in the uniaxial direction without contracting in the direction perpendicular to the direction of elongation; or   (2′) continuously elongating the multilayer film obtained in (1) above at less than the yield point of the expanded, sintered, porous film and at an elongation factor of 1.3 times or more in the biaxial directions, or in the uniaxial direction without contracting in the direction perpendicular to the direction of elongation, and continuously laminating the elastic cloth onto one or both sides of the elongated multilayer film obtained the elongation step; and,   (3) relaxing the elongated laminated fabric obtained in (2) or (2′) above; wherein,   the tensile stress of the composite fabric when elongated by 10% in the longitudinal and/or transverse direction is 2.5 N/15 mm or less, and/or the elongation percentage of the composite fabric in the longitudinal and/or transverse direction is 30% or more and the elongation recovery rate is 70% or more.   
     
     
         13 . A textile product comprising an elastic composite fabric according to  claim 4 . 
     
     
         14 .- 19 . (canceled)