Porous fluoropolymeric fibrous sheet and method of manufacture
AssigneeImperial Chemical Industries PLC
InventorsGraham E. Martin, Ian D. Cockshott, Kevin T. McAloon
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Abstract
A method of preparing a porous sheet product which comprises the step of introducing a spinning liquid comprising an organic fibre forming polymeric material into an electric field whereby fibres are drawn from the liquid to an electrode and collecting the fibres so produced upon the electrode. PTFE and other fluorinated polymer mats produced by the electrostatic process are useful as electrolytic cell diaphragms, battery separators etc.
Claims17
A method of preparing a porous polytetrafluoroethylene fibrous sheet suitable for use as a diaphragm is an electrochemical cell which comprises the step of introducing a spinning liquid comprising a dispersion of a polytetrafluoroethylene material and an additional polymeric component which acts to enhance the viscosity of the spinning liquid and serves to improve its fibre-forming properties into an electric field whereby fibres are drawn from the liquid to an electrode and collecting the fibres so produced upon the electrode in the form of a sheet.
Dependencies are inferred from the claim text.