Patent ID: 8784983
Filing Date: 2014-07-22
Classification: B29C,B29K,B29L,B32B,F16J,Y10T

Abstract:
1. A laminated sheet comprising laminated expanded porous polytetrafluoroethylene films, wherein the sheet has a specific surface area of 9.0 m 2 /g or higher and a density of from 0.4 g/cm 3 to lower than 0.75 g/cm 3 , wherein the laminated sheet has a 180-degree peeling strength of 0.20 N/mm or higher between the films at the center in the thickness direction of the sheet and wherein the laminated sheet has a stress-relaxation rate of 45% or lower after 1 hour when compressed at a surface pressure of 50 MPa, and wherein the laminated sheet has a thickness of from about 0.1 mm to about 300 mm.