GB1212291A - Foamed sheets of thermoplastic polymers - Google Patents

Foamed sheets of thermoplastic polymers

Info

Publication number
GB1212291A
GB1212291A GB4162368A GB4162368A GB1212291A GB 1212291 A GB1212291 A GB 1212291A GB 4162368 A GB4162368 A GB 4162368A GB 4162368 A GB4162368 A GB 4162368A GB 1212291 A GB1212291 A GB 1212291A
Authority
GB
United Kingdom
Prior art keywords
polymer
temperature
solution
extrusion
activating liquid
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
GB4162368A
Inventor
Robert Guy Parrish
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1212291A publication Critical patent/GB1212291A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/143—Halogen containing compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

1,212,291. Laminates. E. I. DU PONT DE NEMOURS & CO. 30 Aug., 1968 [31 Aug., 1967], No. 41623/68. Headings B5N. [Also in Division C3] A laminate comprises a foam sheet of a linear, thermoplastic, crystalline organic polymer of film forming molecular weight free from crosslinking, the polymer having a work-to-break value (as defined) of at least 10,000 in.-lbs./in<SP>3</SP>, the foam sheet consisting of polyhedral shaped closed cells whose median diameter (as defined) is at least 500 microns, the cell walls being characterized by a non-uniform texture, and the foam having a maximum density of 0À03 g/cc. which is laminated to a layer of paper, paper board orwood, a metal sheet, foil, plastic sheet or film, woven or non-woven fabric, other foams, glass leather or rubber sheeting. The foam sheet is made by extruding a solution of the polymer in an activating liquid (as defined) having a boiling point at least 25‹ C. below the melting point of the polymer and being a solvent for the polymer under the extrusion conditions, but dissolving less than 1% by wt. of the polymer at temperatures up to its normal boiling point, the temperature of the solution immediately before its extrusion being above its freezing point and below the temperature at which adiabatic evaporation of all the activating liquid present will produce insufficient cooling to precipitate solid polymer, and the concentration of activating liquid therein ;being between 98% by weight and a minimum amount sufficient to cause precipitation of solid polymer on adiabatic evaporation, the solution being extruded into a region of lower pressure and temperature whereby vaporization of the activating liquid rapidly ccols the solution to a temperature at which solid polymer precipitates and the polymer orientation in the cell wall acquired during extrusion is preserved, formation of the bubble nuclei during the extrusion being restricted to less than 10<SP>5</SP> per cubic centimeter by maintaining the temperature of the solution before the extrusion below the self-nucleating temperature of the activating liquid (as defined) and fibrillation being prevented by maintaining the solution below its fibrillation temperature (as defined).
GB4162368A 1967-08-31 1968-08-30 Foamed sheets of thermoplastic polymers Expired GB1212291A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66478167A 1967-08-31 1967-08-31

Publications (1)

Publication Number Publication Date
GB1212291A true GB1212291A (en) 1970-11-11

Family

ID=24667427

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4162368A Expired GB1212291A (en) 1967-08-31 1968-08-30 Foamed sheets of thermoplastic polymers

Country Status (4)

Country Link
BE (1) BE720124A (en)
FR (1) FR1584174A (en)
GB (1) GB1212291A (en)
NL (1) NL161481C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352892A (en) 1979-03-24 1982-10-05 Firma Carl Freudenberg Method for the manufacture of lightweight foam materials from crystalline thermoplastic materials and the resultant products
EP0163045A2 (en) * 1984-05-30 1985-12-04 Indentor AG Means to accumulate and to distribute heat
FR2642700A1 (en) * 1989-02-08 1990-08-10 Nastrificio Star Pennsylvania DOUBLE LAYERED THIN SHEET PLASTIC MATERIAL FOR PRODUCING DECORATIVE TAPES, PACKAGING AND THE LIKE

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227664A (en) * 1961-12-07 1966-01-04 Du Pont Ultramicrocellular structures of crystalline organic polymer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352892A (en) 1979-03-24 1982-10-05 Firma Carl Freudenberg Method for the manufacture of lightweight foam materials from crystalline thermoplastic materials and the resultant products
EP0163045A2 (en) * 1984-05-30 1985-12-04 Indentor AG Means to accumulate and to distribute heat
EP0163045A3 (en) * 1984-05-30 1987-05-20 Indentor Ag Means to accumulate and to distribute heat, and the use of it
FR2642700A1 (en) * 1989-02-08 1990-08-10 Nastrificio Star Pennsylvania DOUBLE LAYERED THIN SHEET PLASTIC MATERIAL FOR PRODUCING DECORATIVE TAPES, PACKAGING AND THE LIKE

Also Published As

Publication number Publication date
FR1584174A (en) 1969-12-12
NL161481C (en) 1980-02-15
DE1794025A1 (en) 1971-10-07
NL6812420A (en) 1969-03-04
NL161481B (en) 1979-09-17
BE720124A (en) 1969-02-28
DE1794025B2 (en) 1976-10-28

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years