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US 6,143,675 AGranted
Porous composite
AssigneeW. L. Gore & Associates (UK) Ltd.
InventorsFrancis Michael John McCollam, Norman Ernest Clough
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AssigneeW. L. Gore & Associates (UK) Ltd.
InventorsFrancis Michael John McCollam, Norman Ernest Clough
Estimating the term…
A porous composite laminate material comprises a layer (4) of expanded polytetrafluoroethylene (PTFE) membrane, and a layer (2) of non-expanded porous PTFE attached thereto. The non-expanded porous PTFE layer may be a sintered porous PTFE produced by sintering granular-type PTFE particles to form a porous integral network of interconnected particles; and may be produced in situ by spray application onto the membrane followed by baking. Modifiers including unsintered fine powder PTFE, thermoplastic fluorinated organic polymer, a low molecular weight PTFE and mixtures thereof may be included. The expanded PTFE membrane can be in sheet form or in the form of expanded PTFE fibres woven into a fabric. The laminate may be used for oiling and cleaning high temperature fuser rolls in a photocopying machine, or as a filter.
A porous composite material formed substantially of polytetrafluoroethylene which comprises;
A material according to claim I in the form of a multiple layer structure, which comprises a layer of expanded PTFE membrane between and attached to two layers of sintered porous PTFE.
A material according to claim I which does not shrink substantially at 200.degree. C.
A porous composite material formed substantially of polytetrafluoroethylene which comprises:
A method of forming a porous composite material which comprises:
A porous composite material formed substantially of polytetrafluoroethylene which comprises:
A porous composite material formed substantially of polytetrafluoroethylene which comprises:
Dependencies are inferred from the claim text.