Process for producing stretched porous film

Details Process for producing stretched porous film Process for producing stretched porous film

1997-06-27

1998-12-29

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

2642106, 2642107, 2642358, 2642888, 2642902, B29C 5514, B29C 5516, B29C 6720

Patent

active

058536388

ABSTRACT:
A process for producing a porous film, which includes melt-molding a composition prepared by compounding 100 parts by weight of a polyethylene resin mixture of low density polyethylene, linear low density polyethylene, and medium density polyethylene, 50-200 parts by weight of an inorganic filler coated with stearic acid, and 0.1-30 parts by weight of polyethylene wax into film, and stretching the resulting film by an area stretching ratio of 1.5-36 times. The process of the preferred embodiment coats the inorganic filler by floating the inorganic filler with air pressure and spraying the coating onto the floating filler.

REFERENCES:
patent: 3725520 (1973-04-01), Suzuki et al.
patent: 4472328 (1984-09-01), Sugimoto et al.

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