GB1525224A - Cellular polymer films - Google Patents

Cellular polymer films

Info

Publication number
GB1525224A
GB1525224A GB35781/74A GB3578174A GB1525224A GB 1525224 A GB1525224 A GB 1525224A GB 35781/74 A GB35781/74 A GB 35781/74A GB 3578174 A GB3578174 A GB 3578174A GB 1525224 A GB1525224 A GB 1525224A
Authority
GB
United Kingdom
Prior art keywords
cellular
stretched
aug
extrudate
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
GB35781/74A
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.)
BXL Plastics Ltd
Original Assignee
Bakelite Xylonite 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 to AU83934/75A priority Critical patent/AU8393475A/en
Application filed by Bakelite Xylonite Ltd filed Critical Bakelite Xylonite Ltd
Priority to JP9901875A priority patent/JPS5145172A/ja
Priority to GB35781/74A priority patent/GB1525224A/en
Priority to DE19752536305 priority patent/DE2536305A1/en
Priority to FR7525363A priority patent/FR2281821A1/en
Priority to CA233,497A priority patent/CA1062419A/en
Publication of GB1525224A publication Critical patent/GB1525224A/en
Priority to US06/077,187 priority patent/US4264672A/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
    • C08J9/06—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 chemical blowing agent
    • C08J9/10—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/56—After-treatment of articles, e.g. for altering the shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment

Abstract

1525224 Stretched olefine polymer cellular films BAKELITE XYLONITE Ltd 14 Aug 1975 [14 Aug 1974 30 Sept 1974] 35781/74 and 42460/74 Heading C3C [Also in Division B5] A stretched cellular olefine polymer film is made by extruding a mixture of an at least partly crystalline linear olefine polymer and a blowing agent to produce a cellular extrudate which is then stretched to a stretch ratio of at least 1À1 to 1 in at least one of the machine and transverse directions, the extrusion temperature and blowing agent being so chosen that when the extrudate is stretched the film obtained has a uniform cellular structure, not more than 14% by vol. of closed cells (as defined), an apparent density (as defined) which is 90-20% that of the non-cellular unstretched polymer, a cell factor (as defined) equal to or less than + 0À65 (which may be zero or negative), 0-25% by wt. of a filler and/or pigment a thickness up to 11 mils (as defined) and an average cell volume (as defined) not greater than 10<SP>-4</SP> cc. In the examples mixtures of crystalline linear high density polyethylenes, liquid paraffin, azodicarbonamide, a partially saponified ester of montanic acid, hydrogenated tallow, p-toluene sulphonyl semicarbazide, calcium stearate and/ or silica were extruded to form tubular extrudates which were air cooled, collapsed and stretched by take-off rollers to give the above cellular films.
GB35781/74A 1974-08-14 1975-08-14 Cellular polymer films Expired GB1525224A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU83934/75A AU8393475A (en) 1974-09-30 1975-08-13 Polymer films
JP9901875A JPS5145172A (en) 1974-09-30 1975-08-14
GB35781/74A GB1525224A (en) 1975-08-14 1975-08-14 Cellular polymer films
DE19752536305 DE2536305A1 (en) 1974-09-30 1975-08-14 STRETCHED POLYOLE FILMS WITH A SUBSTANTIALLY EVEN CELL STRUCTURE AND PROCESS FOR THEIR PRODUCTION
FR7525363A FR2281821A1 (en) 1974-09-30 1975-08-14 CELLULAR FILM BASED ON LINEAR CRYSTALLINE POLYOLEFIN
CA233,497A CA1062419A (en) 1974-09-30 1975-08-14 Polymer films
US06/077,187 US4264672A (en) 1974-08-14 1979-09-20 Polymer films

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35781/74A GB1525224A (en) 1975-08-14 1975-08-14 Cellular polymer films

Publications (1)

Publication Number Publication Date
GB1525224A true GB1525224A (en) 1978-09-20

Family

ID=10381486

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35781/74A Expired GB1525224A (en) 1974-08-14 1975-08-14 Cellular polymer films

Country Status (1)

Country Link
GB (1) GB1525224A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002006386A3 (en) * 2000-07-13 2002-04-25 John C Marrelli Foamed-thermoplastic films

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002006386A3 (en) * 2000-07-13 2002-04-25 John C Marrelli Foamed-thermoplastic films

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Legal Events

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

Effective date: 19950813