Process for producing highly porous thermoplastic films

Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting

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264171, 2642101, 2642106, 264211, 2642888, 523200, 523216, 524301, 524261, B29D 724

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043506550

ABSTRACT:
There is disclosed a novel process for the cold stretching at high stretch tension and at low stretch ratios of a film of a blend of synthetic orientable thermoplastic polymer and at least 50 weight percent of a coated inorganic filler selected from the group consisting of calcium carbonate, clays and titanium oxide and coated with a fatty acid ester of silicon and titanium to form a highly porous thermoplastic film (i.e. 10,000 to 100,000 surface ruptures/mm.sup.2) exhibiting paper-like properties.

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patent: 3929950 (1975-12-01), Nakamura et al.
patent: 3995007 (1976-11-01), Nakamura et al.
patent: 4116892 (1978-09-01), Schwarz

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