Title:
PRODUCTION OF POROUS FILM OR SHEET
Document Type and Number:
Japanese Patent JP3174647
Kind Code:
B2
Abstract:
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.
Inventors:
Hiroshi Nagami
Kenji Ikehara
Tatsuhiko Daikon
Kenji Ikehara
Tatsuhiko Daikon
Application Number:
JP30833492A
Publication Date:
June 11, 2001
Filing Date:
October 21, 1992
Export Citation:
Assignee:
NITTO DENKO CORPORATION
International Classes:
B29C41/12; B29C55/02; C08J9/00; C08L101/00; B29K23/00; B29K105/04; B29L7/00; (IPC1-7): C08J9/00; B29C41/12; B29C55/02
Domestic Patent References:
| JP58198536A | ||||
| JP63270748A | ||||
| JP6106611A | ||||
| JP62218428A | ||||
| JP4351644A | ||||
| JP466194B1 | ||||
| JP466193B1 |
Attorney, Agent or Firm:
Kiyoji Sawa
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