PRODUCTION OF POROUS FILM OR SHEET

PURPOSE:To obtain a method for producing a porous film or sheet which does not allow a liquid, such as water, to permeate, has uniform and excellent air and moisture permeabilities and is excellent in chemical resistance, dust-freeness and electrical characteristics by mixing at least two dispersion...

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Bibliographische Detailangaben
Hauptverfasser:	ONE TATSUHIKO, NAGAMI HIROSHI, IKEHARA KENJI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a method for producing a porous film or sheet which does not allow a liquid, such as water, to permeate, has uniform and excellent air and moisture permeabilities and is excellent in chemical resistance, dust-freeness and electrical characteristics by mixing at least two dispersions of synthetic resins or high-molecular materials having poor compatibility with each other, applying the mixture on a support and melting it to form a film. CONSTITUTION:A dispersion of a thermoplastic resin (A) is mixed with a dispersion containing a high-molecular material (B) having poor compatibility with the resin A and different in melting point and the mixture is applied on a support, melted and formed into film, thus giving a film or sheet. This film or sheet is stretched at least in one direction at a temperature lower than the melting points of the resin A and the material B.