Resin composition, porous film or sheet
AssigneeMitsubishi Kasei Corporation
InventorsToshio Fujii, Akihiko Sakai, Tasuku Suzuki
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Abstract
Disclosed herein are a resin composition for a porous film or sheet, comprising: 100 parts by weight of a polyolefin (A) having a density of not more than 0.930 g/cm.sup.3 and a melt index of not more than 2 g/10 min; 100 to 400 parts by weight of a filler (B); 1 to 100 parts by weight of a plasticizer (C) composed of a compound having an ester linkage or an amide linkage in a molecule, and having a molecular weight of not less than 100, a boiling point of not lower than 200.degree. C. and a melting point of not higher than 100.degree. C. under an ordinary pressure; and 0.0001 to 0.1 part by weight of a radical generator (D); a porous film or sheet therefrom; and a process for producing the same.
Claims14
A resin composition for a porous film or sheet, comprising:
- 100 parts by weight of a polyolefin (A) having a density of not more than 0.930 g/cm.sup.3 and a melt index of not more than 2 g/10 min;
- 100 to 400 parts by weight of a filler (B);
- 1 to 100 parts by weight of a plasticizer (C) composed of a compound having an ester linkage or an amide linkage in its number average molecule, and having a molecular weight of not less than 100, a boiling point of not lower than 200.degree. C. and a melting point of not higher than 100.degree. C. under atmospheric pressure;
- and
- 0.0001 to 0.1 part by weight of a radical generator (D).
A method of producing a porous film or sheet comprising the steps of:
- forming a film or sheet from a composition defined in claim, by an inflation method in a blow-up ratio of 2 to 8 after or treating with conditions for decomposing the radical generator;
- and uniaxially stretching said film or sheet in the machine direction in a stretch ratio of 1.2 to 8.
Dependencies are inferred from the claim text.