Process of manufacturing a microporous sheet material

Details Process of manufacturing a microporous sheet material Process of manufacturing a microporous sheet material

1979-02-13

1980-12-02

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

260 318M, 260 318PQ, 260 4215, 260 4237, 264 453, 264179, 264DIG17, 521 62, 521 64, B29D 2700

Patent

active

042370833

ABSTRACT:
A process of manufacturing a microporous sheet by forming a blend of a polyolefin, silica and a water insoluble plasticizer, forming a sheet from the blend, and contacting the sheet with water for a time sufficient to render the sheet microporous. The plasticizer, being essentially insoluble in water, is easily separated therefrom and recycled. The preferred plasticizers are dialkyl phthalates and dialkyl adipates having between about two and about eleven carbon atoms in the oxo-alcohol moiety.

REFERENCES:
patent: 3228896 (1966-01-01), Canterino et al.
patent: 3351495 (1967-11-01), Larsen et al.
patent: 3536796 (1970-10-01), Rock
patent: 3931067 (1976-01-01), Goldberg et al.
patent: 4024323 (1977-05-01), Versteega

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