LAMINATE CONTAINING TRANSPARENTIZED STRETCHED POROUS POLYTETRAFLUOROETHYLENE FILM, AND ADHESION PREVENTING SHEET MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a transparentized film in a stretched porous polytetrafluoroethylene film adapted as an adhesion preventing sheet material. SOLUTION: This laminate consists of a stretched porous polytetrafluoroethylene film transparentized by impregnating pores of the porous film with an aq. liquid and the water holding layer absorbing the aq. liquid formed on at least one surface of the film. A laminate package is formed by hermetically sealing and packing the laminate by a packing material not substantially permitting steam to permeate. An adhesion preventing sheet material package is formed by hermetically sealing and packing an adhesion preventing sheet material by a packing material no substantially permitting steam to permeate.