GB1476791A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1476791A – Process for producing porous polymer film
– Google Patents

GB1476791A – Process for producing porous polymer film
– Google Patents
Process for producing porous polymer film

Info

Publication number
GB1476791A

GB1476791A
GB2548974A
GB2548974A
GB1476791A
GB 1476791 A
GB1476791 A
GB 1476791A
GB 2548974 A
GB2548974 A
GB 2548974A
GB 2548974 A
GB2548974 A
GB 2548974A
GB 1476791 A
GB1476791 A
GB 1476791A
Authority
GB
United Kingdom
Prior art keywords
voids
temperature
stretching
polymer composition
porous polymer
Prior art date
1973-06-11
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.)

Expired

Application number
GB2548974A
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.)

Panasonic Holdings Corp

Original Assignee
Matsushita Electric Industrial Co Ltd
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.)
1973-06-11
Filing date
1974-06-07
Publication date
1977-06-16

1973-06-11
Priority claimed from JP6666073A
external-priority
patent/JPS5018574A/ja

1974-02-06
Priority claimed from JP1578974A
external-priority
patent/JPS5628931B2/ja

1974-06-07
Application filed by Matsushita Electric Industrial Co Ltd
filed
Critical
Matsushita Electric Industrial Co Ltd

1977-06-16
Publication of GB1476791A
publication
Critical
patent/GB1476791A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE

B29D7/00—Producing flat articles, e.g. films or sheets

Abstract

1476791 Stretched porous polymer films MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 7 June 1974 [11 June 1973 6 Feb 1974] 25489/74 Heading C3C Porous polymer films are made by the separate sequential steps of (a) forming voids in a stretchable polymer composition having a phase separation structure (i.e. in which the same or different compounds form two or more phases) and having the property of forming voids on deformation at a temperature below its m.p. (b) heating the polymer composition concontaining the voids to its stretching temperature (which is lower than the m.p. and higher than the temperature at which voids are formed on deformation) under tension of at least 0À1 Kg/mm2 in one direction so that the voids do not disappear and (c) enlarging the voids by multi-axial stretching of the polymer composition at the stretching temperature. In the examples sheets of isotactic polypropylene which was connected to let crystalline particles grow high impact polystyrene (containing butadiene) and blends of polyethylene isotactic and atactic polypropylene nylon 6, polystyrene, ethylene vinyl acetate copolymer, polyethylene terephthalate, nylon 12, polyvinyl chloride, polyacetal and/or polycarbonate were cracked by bending along a bar in liquid nitrogen or at room temperature, by pressing a metal bar against the sheet placed on a rubber plate, by winding the sheet around a metal bar or by stretching the sheet by rolling between belts; the cracked sheets were then heated under tension and then stretched biaxially in one or two stages.

GB2548974A
1973-06-11
1974-06-07
Process for producing porous polymer film

Expired

GB1476791A
(en)

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

JP6666073A

JPS5018574A
(en)

1973-06-11
1973-06-11

JP1578974A

JPS5628931B2
(en)

1974-02-06
1974-02-06

Publications (1)

Publication Number
Publication Date

GB1476791A
true

GB1476791A
(en)

1977-06-16

Family
ID=26351996
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB2548974A
Expired

GB1476791A
(en)

1973-06-11
1974-06-07
Process for producing porous polymer film

Country Status (4)

Country
Link

CA
(1)

CA1044419A
(en)

DE
(1)

DE2427862A1
(en)

FR
(1)

FR2232430B1
(en)

GB
(1)

GB1476791A
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4452845A
(en)

1980-08-13
1984-06-05
Smith And Nephew Associated Companies Limited
Moisture vapor transmitting film of polyurethane blended with an incompatible polymer

Families Citing this family (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4511520A
(en)

1982-07-28
1985-04-16
American Can Company
Method of making perforated films

Family Cites Families (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

BE758820A
(en)

1969-11-13
1971-05-12
Celanese Corp

PROCESS FOR THE PRODUCTION OF OPEN-CELL MICROPOROUS FILMS

1974

1974-06-07
GB
GB2548974A
patent/GB1476791A/en
not_active
Expired

1974-06-10
FR
FR7419930A
patent/FR2232430B1/fr
not_active
Expired

1974-06-10
CA
CA202,085A
patent/CA1044419A/en
not_active
Expired

1974-06-10
DE
DE19742427862
patent/DE2427862A1/en
not_active
Ceased

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4452845A
(en)

1980-08-13
1984-06-05
Smith And Nephew Associated Companies Limited
Moisture vapor transmitting film of polyurethane blended with an incompatible polymer

Also Published As

Publication number
Publication date

FR2232430A1
(en)

1975-01-03

DE2427862A1
(en)

1975-01-02

FR2232430B1
(en)

1978-02-17

CA1044419A
(en)

1978-12-19

Información de contacto