GB687398A - Improvements in or relating to methods of making free-flowing cellular pellets of thermoplastic resins - Google Patents

Improvements in or relating to methods of making free-flowing cellular pellets of thermoplastic resins

Info

Publication number
GB687398A
GB687398A GB20428/51A GB2042851A GB687398A GB 687398 A GB687398 A GB 687398A GB 20428/51 A GB20428/51 A GB 20428/51A GB 2042851 A GB2042851 A GB 2042851A GB 687398 A GB687398 A GB 687398A
Authority
GB
United Kingdom
Prior art keywords
air
gaseous
pressure
gel
oil
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
GB20428/51A
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
Priority to BE505625D priority Critical patent/BE505625A/xx
Priority to NL77282D priority patent/NL77282C/xx
Priority to NL7402588.A priority patent/NL164231B/en
Priority to US75556A priority patent/US2576977A/en
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Priority to FR1048058D priority patent/FR1048058A/en
Priority to GB20428/51A priority patent/GB687398A/en
Priority to DED10212A priority patent/DE891609C/en
Publication of GB687398A publication Critical patent/GB687398A/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
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • 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
    • 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
    • B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
    • 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
    • C08J9/16—Making expandable particles

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (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)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A method of making free-flowing cellular pellets of a thermoplastic resin (see Group V), comprises extruding, at temperatures between 60 DEG and 120 DEG C., a mobile gel comprising an intimate mixture of a thermoplastic resin having a normally gaseous agent described therein under pressure through a constructed passageway to a zone of lower pressure, cutting the extruding plastic gel into segments before complete expansion occurs and thereafter causing the severed pieces to fall freely through the air while completing the expansion. The mobile gel may be prepared by placing the resin in a ground or powdered form in a pressure-resistant vessel, adding the gaseous agent, and maintaining the mixture under pressure till homogeneous. Suitable thermoplastic resins are polymers and copolymers of styrene, meta-ethylstyrene, meta-chlorostyrene, methylstyrene, para - isopropylstyrene, ortho - chlorostyrene and alpha-methylstyrene; polymethylmethacrylate; and copolymers of vinyl chloride and vinyl acetate or of methylmethacrylate and styrene. Suitable gaseous agents are methylchloride, methylether, ethyl ether methylethyl ether, ethyl chloride, methyl bromide, dichloro-difluoromethane, normally gaseous olefines such as propylene and butylene and cracked-oil gas fractions containing such gaseous olefines. The rate of expansion may be retarded by adding barium, calcium, lead or zinc stearate in proportions of from 0.04 to 1 per cent by weight of the resin. The extrusion pressure may be increased by mechanical forcing of the gel or by introducing to the pressure chamber carbon dioxide, air, nitrogen or the like. To aid extrusion and cutting of the gela lubricant, e.g. stearic acid, soya oil, corn oil, lard oil or butyl stearate, may be added. Pigments, fillers or binders, e.g. finely-divided carbon, aluminium powder, titanium dioxide, fuller's earth, powdered calcium silicate or clay may be added. For rapid vaporization of the gaseous agent in the extruded pellets the air through which they fall may be warmed and instead of air, nitrogen or carbon dioxide may be used.
GB20428/51A 1949-02-10 1951-08-29 Improvements in or relating to methods of making free-flowing cellular pellets of thermoplastic resins Expired GB687398A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE505625D BE505625A (en) 1951-08-29
NL77282D NL77282C (en) 1951-08-29
NL7402588.A NL164231B (en) 1951-08-29 AIR TIRE OF THE TYPE WITH A RADIAL CARCASE.
US75556A US2576977A (en) 1949-02-10 1949-02-10 Method of making free-flowing cellular pellets of thermoplastic resins
FR1048058D FR1048058A (en) 1951-08-29 1951-08-29 Improved process for the preparation of free-flowing cell globules, and resulting products
GB20428/51A GB687398A (en) 1951-08-29 1951-08-29 Improvements in or relating to methods of making free-flowing cellular pellets of thermoplastic resins
DED10212A DE891609C (en) 1951-08-29 1951-09-14 Process for the production of cellular, separated cores from thermoplastics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20428/51A GB687398A (en) 1951-08-29 1951-08-29 Improvements in or relating to methods of making free-flowing cellular pellets of thermoplastic resins

Publications (1)

Publication Number Publication Date
GB687398A true GB687398A (en) 1953-02-11

Family

ID=10145799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20428/51A Expired GB687398A (en) 1949-02-10 1951-08-29 Improvements in or relating to methods of making free-flowing cellular pellets of thermoplastic resins

Country Status (4)

Country Link
BE (1) BE505625A (en)
FR (1) FR1048058A (en)
GB (1) GB687398A (en)
NL (2) NL77282C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2359064A1 (en) * 1972-11-28 1974-06-06 Alta Ind PROCESS AND DEVICE FOR THE PRODUCTION OF LOOSE, CELLULAR FILLING MATERIALS
EP0041431B1 (en) 1980-05-23 1983-11-30 Maurice Deledalle Filler of foamable thermoplastic material and method and apparatus for making it
DE3413268A1 (en) * 1984-04-07 1985-12-12 Kohler & Stuhr GmbH & Co KG, 7867 Wehr Filling mixture for cushions
GB2162789A (en) * 1984-07-16 1986-02-12 Cosden Technology Process for making expandable polystyrene
CN112121946A (en) * 2020-08-11 2020-12-25 湖州爆米花信息科技有限公司 Foaming machine capable of avoiding internal blockage during automobile accessory part processing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2359064A1 (en) * 1972-11-28 1974-06-06 Alta Ind PROCESS AND DEVICE FOR THE PRODUCTION OF LOOSE, CELLULAR FILLING MATERIALS
EP0041431B1 (en) 1980-05-23 1983-11-30 Maurice Deledalle Filler of foamable thermoplastic material and method and apparatus for making it
DE3413268A1 (en) * 1984-04-07 1985-12-12 Kohler & Stuhr GmbH & Co KG, 7867 Wehr Filling mixture for cushions
GB2162789A (en) * 1984-07-16 1986-02-12 Cosden Technology Process for making expandable polystyrene
CN112121946A (en) * 2020-08-11 2020-12-25 湖州爆米花信息科技有限公司 Foaming machine capable of avoiding internal blockage during automobile accessory part processing

Also Published As

Publication number Publication date
FR1048058A (en) 1953-12-18
NL77282C (en)
NL164231B (en)
BE505625A (en)

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