GB834956A - Process for making fire-resistant cellular vinyl aromatic polymer articles - Google Patents

Process for making fire-resistant cellular vinyl aromatic polymer articles

Info

Publication number
GB834956A
GB834956A GB7841/58A GB784158A GB834956A GB 834956 A GB834956 A GB 834956A GB 7841/58 A GB7841/58 A GB 7841/58A GB 784158 A GB784158 A GB 784158A GB 834956 A GB834956 A GB 834956A
Authority
GB
United Kingdom
Prior art keywords
polymer
polystyrene
cellular
blowing agent
alpha
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
GB7841/58A
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.)
Dow Chemical Co
Original Assignee
Dow Chemical 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 Dow Chemical Co filed Critical Dow Chemical Co
Publication of GB834956A publication Critical patent/GB834956A/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
    • 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
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/461—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length dispensing apparatus, e.g. dispensing foaming resin over the whole width of the moving surface
    • 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
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • 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
    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C08J2325/06—Polystyrene
    • 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
    • C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers

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)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Scrap from the working of cellular polystyrene and other thermoplastics containing fire retardants such as halogenated hydrocarbons, and expanded by a normally gaseous expanding agent, is recovered by hot pressing the scrap to form a dense sintered product, heating to melting at 190-280 DEG C. to liberate volatile constituents and returning to the process for making the cellular fire-retardant material. Specified thermoplastics are polystyrene, polyvinyl toluene, polystyrene with 2-10% of natural or synthetic rubber, copolymers of styrene with 5-30% of alpha-methyl styrene, acrylonitrile or methylmethacrylate, or copolymers of any two or more of styrene, vinyltoluene, vinyl xylene or isopropylstyrene. Specified fire retardants are tetrabromoethane, alpha - beta - dibromoethylbenzene, ar - chloro-alpha, beta - dibromoethylbenzene, 1,2 - dibromopropane, 1,2 - dibromobutane, 1,2,3-tribromopropane or tetra-bromopentane in a quantity of 1 to 10% by weight of the polymer. Methyl chloride is used as expanding agent. Expansion is effected by extruding a compounded mobile gel at 100 DEG C. into the atmosphere.ALSO:In a process for the continuous production of shaped articles of cellular thermoplastic material wherein a thermoplastic vinyl aromatic polymer, e.g. polystyrene, at a plastifying temperature of 120 DEG 250 DEG C and a normally gaseous blowing agent soluble in the polymer, e.g., methyl chloride, are mixed, in the proportion of 5-25 parts of the blowing agent to 100 of the polymer, under pressure and cooled to 60 DEG -130 DEG C., the gel so formed is continuously extruded under pressure sufficiently decreased to expand the gel, and the cellular material so formed is cut and trimmed to the shaped articles, the scrap material from the cutting and trimming is collected, sintered by pressure at a temperature of 90 DEG -160 DEG C., and heated to melting between 190 DEG and 280 DEG C to liberate volatile constituents, and the plastic material remaining on removal of the volatile constituents is returned for mixture with the blowing agent in the proportion stated. 1-10 parts of an organic flame-proofing compound, e.g. sym-tetrabromo-ethane may be incorporated during the mixing of the polymer and the blowing agent.
GB7841/58A 1957-03-29 1958-03-11 Process for making fire-resistant cellular vinyl aromatic polymer articles Expired GB834956A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US834956XA 1957-03-29 1957-03-29

Publications (1)

Publication Number Publication Date
GB834956A true GB834956A (en) 1960-05-11

Family

ID=22178712

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7841/58A Expired GB834956A (en) 1957-03-29 1958-03-11 Process for making fire-resistant cellular vinyl aromatic polymer articles

Country Status (2)

Country Link
FR (1) FR1204428A (en)
GB (1) GB834956A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124238A (en) * 1982-07-16 1984-02-15 Synfina Sa Process and apparatus for redensifying thermoplastics resin foam
GB2200121A (en) * 1987-01-08 1988-07-27 Wardle Storeys Plc Re-processing of crosslinked polyolefin foam waste
WO2009029619A2 (en) * 2007-08-27 2009-03-05 Dow Global Technologies, Inc. Improved method of forming extruded polystyrene foams and the products made thereform
ITUD20090216A1 (en) * 2009-11-25 2011-05-26 Polymtec Trading Ag ARTICLE BASED ON EXTRUDED POLYSTYRENE, PROCEDURE AND PLANT TO OBTAIN THIS ITEM

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136142A (en) * 1977-03-23 1979-01-23 Polysar Limited Process for extruding stabilized expanded polystyrene composition

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124238A (en) * 1982-07-16 1984-02-15 Synfina Sa Process and apparatus for redensifying thermoplastics resin foam
GB2200121A (en) * 1987-01-08 1988-07-27 Wardle Storeys Plc Re-processing of crosslinked polyolefin foam waste
GB2200121B (en) * 1987-01-08 1991-03-20 Wardle Storeys Plc Re-use of crosslinked polyolefin foam waste
WO2009029619A2 (en) * 2007-08-27 2009-03-05 Dow Global Technologies, Inc. Improved method of forming extruded polystyrene foams and the products made thereform
WO2009029619A3 (en) * 2007-08-27 2009-09-11 Dow Global Technologies, Inc. Improved method of forming extruded polystyrene foams and the products made thereform
US8092727B2 (en) 2007-08-27 2012-01-10 Dow Global Technologies Llc Method of forming extruded polystyrene foams and the products made therefrom
ITUD20090216A1 (en) * 2009-11-25 2011-05-26 Polymtec Trading Ag ARTICLE BASED ON EXTRUDED POLYSTYRENE, PROCEDURE AND PLANT TO OBTAIN THIS ITEM

Also Published As

Publication number Publication date
FR1204428A (en) 1960-01-26

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