Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1996-06-19
1998-12-29
Reifsnyder, David A.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 41, 2642888, 4283044, 2105101, C08J 918
Patent
active
058536337
ABSTRACT:
A method of producing a microporous thermoplastic resin membrane of excellent permeability having uniform and fine micropores without filling stress concentrators to the thermoplastic resin is provided. Namely, there is provided a method of producing a microporous thermoplastic resin membrane, in which a thermoplastic resin foam incorporating fine cells having a ratio B/A between a cell size (A) and a wall thickness (B) of the cells of less than 0.5 and having a void ratio of not less than about 50% is subjected to plastic deformation of the boundaries of the cells themselves sufficient to cause shape deformation of the cells, thereby breaking the boundaries of the cells. Also there is provided a microporous thermoplastic resin membrane of excellent permeability having uniform and fine micropores produced by the method as described above.
REFERENCES:
patent: 4734196 (1988-03-01), Kono et al.
patent: 5422377 (1995-06-01), Aubert
Derwent Publications Ltd., Abstract 86-016512 of Japanese Published Application No. 60 238 334 (Nov. 27, 1985).
Kono Koichi
Takita Kotaro
Reifsnyder David A.
Schneller John W.
Tonen Chemical Corporation
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