Process for producing stretched porous film
AssigneeSamsung General Chemicals Co., Ltd.
InventorYoung-Kyoo Han
Life of this patent
Estimating the term…
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.
Claims6
A process for producing a porous film, which comprises the steps of:
- compounding 50 to 200 parts by weight of an inorganic filler coated with stearic acid, 0.1 to 30 parts by weight of polyethylene wax, and 100 parts by weight of a polyethylene resin mixture of low density polyethylene having a density of 0.916 to 0.922 grams/cubic centimeter, linear low density polyethylene having a density of 0.923 to 0.930 grams/cubic centimeter, and medium density polyethylene having a density of 0.931 to 0.940 grams/cubic centimeter to produce a compound,
- melt-molding said compound to produce a film, and stretching said film at an area stretching ratio of 1.5 to 36 times.
A process for producing a porous film, which comprises the steps of:
- floating inorganic filler in the air under high pressure,
- spraying molten stearic acid upon said floating inorganic filler,
- compounding 50 to 200 parts by weight of said inorganic filler coated with stearic acid, 0.1 to 30 parts by weight of polyethylene wax, and 100 parts by weight of a polyethylene resin mixture of low density polyethylene having a density of 0.916 to 0.922 grams/cubic centimeter, linear low density polyethylene having a density of 0.923 to 0.930 grams/cubic centimeter, and medium density polyethylene having a density of 0.931 to 0.940 grams/cubic centimeter to produce a compound,
- melt-molding said compound to produce a film, and
- stretching said film at an area stretching ratio of 1.5 to 36 times to form said porous film.
Dependencies are inferred from the claim text.