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EP0227481A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Process for preparing porous film or sheet

Assignee: Eneos Corp
•
Filing: 1986-12-24
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Granted: —
•
Expires: 2006-12-24
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Abstract

Abstract process for preparing a porous film or sheet, which process comprises melt-forming a composition into a film or sheet and then stretching the thus-formed film or sheet at a temperature in the range of 30° to 110°C, said composition containing: (a) 30-90% by weight of a linear low-density polyethylene having a density not smaller than 0.910 g/cm 3 and smaller than 0.940 g/cm 3 ; (b) 10-70% by weight of an ethyleneia-olefin copolymer having a density not smaller than 0.860 g/cm 3 and smaller than 0.910 g/cm 3 , a boiling n-hexane insolubles content not less than 10% by weight and a maximum peak temperature not lower than 100°C as measured according to a differential scanning calorimetry; and (c) 20-500 parts by weight of a filler based on 100 parts by weight of said resin components.

Inventors

  • 👤 Motomi Nogiwa
  • 👤 Shuichi Yoshida
  • 👤 Shigeki Komori
  • 👤 Toshitsume Yoshikawa
  • 👤 Toshio Koutsuka

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 15:15
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K3/00; C08K3/01; C08K3/013; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08J2323/00; C08J2323/02; C08J2323/04; C08L2205/00; C08L2205/02

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 136 words
A process for preparing a porous film or sheet, which process comprises melt-forming a composition into a film or sheet and then stretching the thus-formed film or sheet at a temperature in the range of 30° to 110°C, said composition containing: (a) 30-90% by weight of a linear low-density polyethylene having a density not smaller than U.910 g/cm 3 and smaller than 0.940 g/cm 3 ; (b) 10-70% by weight of an ethylene/α-olefin copolymer having a density not smaller than 0.860 g/cm 3 and smaller than 0.910 g/cm 3 , a boiling n-hexane insolubles content not less than 10% by weight and a maximum peak temperature not lower than 100°C as measured according to differential scanning calorimetry; and (c) 20-500 parts by weight of a filler based on 100 parts by weight of said resin components.
Claim 2
Dependent Claim 136 words
A process for preparing a porous film or sheet, which process comprises melt-forming a composition into a film or sheet and then stretching the thus-formed film or sheet at a temperature in the range of 30° to 110°C, said composition containing: (a) 30-90% by weight of a linear low-density polyethylene having a density not smaller than U.910 g/cm 3 and smaller than 0.940 g/cm 3 ; (b) 10-70% by weight of an ethylene/α-olefin copolymer having a density not smaller than 0.860 g/cm 3 and smaller than 0.910 g/cm 3 , a boiling n-hexane insolubles content not less than 10% by weight and a maximum peak temperature not lower than 100°C as measured according to differential scanning calorimetry; and (c) 20-500 parts by weight of a filler based on 100 parts by weight of said resin components.
Claim 3
Dependent Claim 28 words
A process as set forth in Claim 1, wherein a dispersing aid (d) is added to said composition in an amount not larger than 20 parts by weight.
Claim 4
Dependent Claim 14 words
A process as set forth in Claim 2, wherein said dispersing aid is polybutene.
Claim 5
Dependent Claim 29 words
A process as set forth in any one of Claims 1 to 2, wherein said stretching is carried out at a temperature in the range of 50° to 105°C.
Claim 6
Dependent Claim 29 words
A process as set forth in any one of Claims 1 to 4, wherein said stretching is carried out at a stretch ratio of 1.5 to 4. 0 .
Claim 7
Dependent Claim 34 words
The use of a porous film or sheet prepared by the process claimed in any one of Claims 1 to 5 in the production of obtaining clothes, sanitary articles, medical supplies, or filter media.

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