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US 4,908,251 AGranted
Porous reinforcement sheet
AssigneeNitto Denko Corporation
InventorsMituo Iimura, Masatoshi Heguri, Satoru Gunji, Kenji Ikehara
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Abstract
A reinforcement type porous sheet comprising (a) a laminated sheet comprising a hot melt type porous sheet and a plastic porous sheet, and (b) a porous substrate bonded to the hot melt type porous sheet.
Claims16
A porous reinforcement sheet which is permeable to gases and liquids, comprising:
- (a) a laminated sheet comprising a plastic porous sheet comprising a thermoplastic resin, and a hot melt type porous sheet having a thickness of about 5 to 500 .mu.m, comprising a hot melt polymer having a melting point at least 5.degree. C. lower than that of the thermoplastic resin, said plastic porous sheet having numerous cracks of about 10 to 2,500 .mu.m in length;
- and
- (b) a porous substrate which is permeable to gases and liquids and is directly adhered to the hot melt type porous sheet by the hot melt polymer.
Dependencies are inferred from the claim text.