[go: up one dir, main page]

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
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.)
Filing date
Publication date
Priority claimed from JP6666073A external-priority patent/JPS5018574A/ja
Priority claimed from JP1578974A external-priority patent/JPS5628931B2/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of GB1476791A publication Critical patent/GB1476791A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

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/mm<SP>2</SP> 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

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
CA1044419A (en) 1978-12-19
FR2232430B1 (en) 1978-02-17
DE2427862A1 (en) 1975-01-02
FR2232430A1 (en) 1975-01-03

Similar Documents

Publication Publication Date Title
US3627625A (en) Biaxially oriented sheet
GB1253630A (en) Improvements in and relating to the surface treatment of stretched plastics films
JPH0236238A (en) Dimensionally stable orientated film of chlorotrifluoroethylene polymer and manufacture of said film
GB1537260A (en) Polyester films
GB1475949A (en) Apparatus for stretching a continuous length of material
EP0358446A3 (en) Oriented polyethylene film and production thereof
US3165499A (en) Film and process for making same
GB1476791A (en) Process for producing porous polymer film
GB1486638A (en) Matt and scratch-resistant films and process for their manufacture
CA2017698A1 (en) Process for producing thermoformable polypropylene films and sheets
GB1481130A (en) Process for producing polymeric films from crystallizing polyesters
GB1055803A (en) Improved thermoplastic films
JPS5787330A (en) Manufacture of film, which consist of vinyl chloride polymer and is biaxially stretched and embossed
NO983793L (en) Shrink films and method for making films with maximum heat shrinkage
GB1470372A (en) Thermoplastics compositions
CA1013113A (en) Biaxially stretching tubular polyethylene terephthalate films
GR3001660T3 (en) Method of and apparatus for thermoforming semifinished products extruded in form of continuous, alveolate sheets or panels, in particular of polypropylene
FR2196238B1 (en)
JPS6224270B2 (en)
JPS6212014B2 (en)
JPS5712612A (en) Stretching method for film of saponified ethylene-vinyl acetate copolymer
GB1270954A (en) Process for the production of oriented polyolefin films
ES8606115A1 (en) Monoaxially stretched plastic sheets or strips and process for their production.
GB1356940A (en) Oriental films of thermoplastic material
DE1536060C (en) Packaging process

Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940606