CA2025520A1 - Microporous polyolefin membrane and method of producing same - Google Patents

Microporous polyolefin membrane and method of producing same

Info

Publication number
CA2025520A1
CA2025520A1 CA 2025520 CA2025520A CA2025520A1 CA 2025520 A1 CA2025520 A1 CA 2025520A1 CA 2025520 CA2025520 CA 2025520 CA 2025520 A CA2025520 A CA 2025520A CA 2025520 A1 CA2025520 A1 CA 2025520A1
Authority
CA
Canada
Prior art keywords
weight
polyolefin
average molecular
solution
microporous polyolefin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2025520
Other languages
French (fr)
Other versions
CA2025520C (en
Inventor
Kotaro Takita
Koichi Kono
Tatsuya Takashima
Kenkichi Okamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tonen General Sekiyu KK
Original Assignee
Tonen Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tonen Corp filed Critical Tonen Corp
Priority to CA 2025520 priority Critical patent/CA2025520C/en
Publication of CA2025520A1 publication Critical patent/CA2025520A1/en
Application granted granted Critical
Publication of CA2025520C publication Critical patent/CA2025520C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

A microporous polyolefin membrane made of a polyolefin composition containing 1 weight % or more of an ultra-high-molecular-weight polyolefin having a weight-average molecular weight of 7 x 10 5 or more and having a weight-average molecular weight/number-average molecular weight ratio of 10-300, the microporous membrane having a thickness of 0.1-25 .mu.m, a porosity of 35-95%, an average pore diameter of 0.001-0.2 .mu.m and a breaking strength of 0.2 kg or more per 15 mm width is produced by (a) preparing a solution comprising 10-50 weight % of the polyolefin composition and 50-90 weight % of a solvent; (b) extruding the solution through a die; (c) cooling the extruded solution to form a gel-like article; (d) stretching the gel-like article at a temperature equal to or lower than a melting point of the polyolefin composition -+ 10.degree.C; and (e) removing the remaining solvent.
CA 2025520 1990-09-17 1990-09-17 Microporous polyolefin membrane and method of producing same Expired - Lifetime CA2025520C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2025520 CA2025520C (en) 1990-09-17 1990-09-17 Microporous polyolefin membrane and method of producing same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2025520 CA2025520C (en) 1990-09-17 1990-09-17 Microporous polyolefin membrane and method of producing same

Publications (2)

Publication Number Publication Date
CA2025520A1 true CA2025520A1 (en) 1992-03-18
CA2025520C CA2025520C (en) 2001-05-29

Family

ID=4145988

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2025520 Expired - Lifetime CA2025520C (en) 1990-09-17 1990-09-17 Microporous polyolefin membrane and method of producing same

Country Status (1)

Country Link
CA (1) CA2025520C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9624363B2 (en) * 2012-12-13 2017-04-18 Reliance Industries Limited Easily processable ultrahigh molecular weight polyethylene and a process for preparation thereof

Also Published As

Publication number Publication date
CA2025520C (en) 2001-05-29

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