Polytetrafluoroethylene laminated article
AssigneeDaikin Industries, Ltd.
InventorsKazuo Ishiwari, Tatsuro Uchida, Masahiko Yamada
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Abstract
To provide a PTFE laminated article having a sufficient adhesive strength and a PTFE backing sheet having a low permeability, in which a specific weight of a PTFE sheet can be maintained high. A specific weight of the PTFE sheet is maintained at 2.175 or more by carrying out thermo-fusing of the PTFE sheet and a film or sheet of heat-meltable resin such as PFA after interposing a layer of PTFE fine particles between them or by carrying out treatment for preventing a rapid temperature lowering after the thermo-fusing without interposing the layer of PTFE fine particles.
Claims7
A laminated article having a heat-fusing layered structure obtained by laminating a polytetrafluoroethylene sheet having an average specific weight of not less than 2.175 and a heat resistant woven fabric by interposing a heat-meltable resin layer therebetween, wherein said polytetrafluoroethylene sheet of said laminate has an average specific weight of not less than 2.175 and said polytetrafluoroethylene is polytetrafluoroethylene modified with perfluoro(alkyl vinyl ether).
A laminated article having a heat-fusing layered structure comprising a polytetrafluoroethylene sheet having an average specific weight of not less than 2.175 and a heat-meltable resin layer, wherein said polytetrafluoroethylene sheet of said laminate has an average specific weight of not less than 2.175 and said polytetrafluoroethylene is polytetrafluoroethylene modified with perfluoro(alkyl vinyl ether), and
- wherein said polytetrafluoroethylene sheet comprises a high specific weight layer having a specific weight exceeding 2.175 and a low specific weight layer having a specific weight lower than that of the high specific weight layer.
Dependencies are inferred from the claim text.