GB971378A - Articles of foamed polystyrene - Google Patents

Articles of foamed polystyrene

Info

Publication number
GB971378A
GB971378A GB622661A GB622661A GB971378A GB 971378 A GB971378 A GB 971378A GB 622661 A GB622661 A GB 622661A GB 622661 A GB622661 A GB 622661A GB 971378 A GB971378 A GB 971378A
Authority
GB
United Kingdom
Prior art keywords
blowing
polystyrene
temperature
grains
low
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
GB622661A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB971378A publication Critical patent/GB971378A/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
    • C08J9/22—After-treatment of expandable particles; Forming foamed products
    • C08J9/228—Forming foamed products
    • C08J9/232—Forming foamed products by sintering expandable particles
    • 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
    • C08J9/22—After-treatment of expandable particles; Forming foamed products
    • 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
    • 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

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)

Abstract

Polystyrene grains containing a volatile non-solvent liquid blowing agent are shaped e.g. by extrusion or injection moulding under pressure, sufficient to agglomerate the grains and leave no substantial amount of cords between them, and at a temperature too low for blowing, and the shaped products are aged at a temperature too low for blowing at least until they become opaque. Heating the articles, if desired in stages then produces foamed polystyrene. The volatile blowing liquid is preferably a hydrocarbon boiling between 10 DEG and 70 DEG C. Desirably it is mixed with a liquid which is relatively soluble in polystyrene, e.g. methylene chloride, chloroform, carbon tetrachloride, trichloroethylene, or benzene. The minimum ageing period at only about 12 hours at -10 DEG C., and is of the order of 5 days at room temperature. The polystyrene grains may contain 3-15% of blowing agent, e.g. petroleum ether and the agent may contain 0.3-0.5 methylene chloride. Preferably the grains are washed with water before introduction with the shaping machine and retain about 1-5% of their weight of water. A temperature of 85 DEG C. may be used at the entry into the machine increasing to 105-115 DEG C. in the nozzle. The shaped strip is cooled immediately on leaving the machine. The material does not blow in the press because the blowing agent dissolves in the polystyrene. It then separates during ageing rendering the composition opaque, and blowing can then take place at a temperature as low as 85 DEG to 95 DEG C. Specification 924,924 is referred to.
GB622661A 1960-02-27 1961-02-20 Articles of foamed polystyrene Expired GB971378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0035485 1960-02-27

Publications (1)

Publication Number Publication Date
GB971378A true GB971378A (en) 1964-09-30

Family

ID=7267103

Family Applications (1)

Application Number Title Priority Date Filing Date
GB622661A Expired GB971378A (en) 1960-02-27 1961-02-20 Articles of foamed polystyrene

Country Status (4)

Country Link
AT (1) AT248680B (en)
CH (1) CH425202A (en)
GB (1) GB971378A (en)
NL (1) NL261705A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456573A (en) * 1981-07-27 1984-06-26 Lavorazione Materie Plastiche L.M.P. S.P.A. Method for the production of aged and expanded polystyrene panels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456573A (en) * 1981-07-27 1984-06-26 Lavorazione Materie Plastiche L.M.P. S.P.A. Method for the production of aged and expanded polystyrene panels

Also Published As

Publication number Publication date
CH425202A (en) 1966-11-30
AT248680B (en) 1966-08-10
NL261705A (en)

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