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GB1348646A - Treatment of polymeric materials - Google Patents

Treatment of polymeric materials

Info

Publication number
GB1348646A
GB1348646A GB6075070A GB1348646DA GB1348646A GB 1348646 A GB1348646 A GB 1348646A GB 6075070 A GB6075070 A GB 6075070A GB 1348646D A GB1348646D A GB 1348646DA GB 1348646 A GB1348646 A GB 1348646A
Authority
GB
United Kingdom
Prior art keywords
die
sheet
electrodes
lips
extruder
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
GB6075070A
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.)
Monsanto Chemicals Ltd
Original Assignee
Monsanto Chemicals 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
Application filed by Monsanto Chemicals Ltd filed Critical Monsanto Chemicals Ltd
Publication of GB1348646A publication Critical patent/GB1348646A/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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/12—Chemical modification
    • C08J7/123—Treatment by wave energy or particle radiation
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/0081—After-treatment of articles without altering their shape; Apparatus therefor using an electric field, e.g. for electrostatic charging
    • 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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/08—Heat treatment
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F1/00—Preventing the formation of electrostatic charges
    • H05F1/02—Preventing the formation of electrostatic charges by surface treatment
    • 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
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • 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
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds 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
    • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • 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
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Filtering Materials (AREA)

Abstract

1348646 Removing static electricity during extrusion MONSANTO CHEMICALS Ltd 24 Nov 1971 [22 Dec 1970] 60750/70 Heading B5A [Also in Division C3] The electrostatic tendency of polymeric materials to attract dust is reduced by heating the material in an electric field to a temperature below its decomposition temperature, the electric field being insufficient to produce ohmic contact between the material and an electrode used to apply the field, as a result of ionization of air, or any other insulation breakdown but being sufficient to cause migration of charges within the material. The field may be D.C. or very low frequency A.C. In one embodiment, thermoplastic polymers are treated whilst they are being extrusion moulded into sheet form, the electrodes being built into the die of the extruder. Such an extrusion die is shown in Fig. 4 in cross-section. The extruder itself is not shown. The die comprises a two-part die head 42, 43, the two parts forming a manifold 43 which is supplied with an adjustable spreader bar 44. The die also comprises lips 45 and 46. Lip 46 is adjustable by means of bolts 53 according to the thickness of sheet required. Lip 45 is insulated from the rest of the die assembly by insulating pads 47 and 48, and forms one of the electrodes. The other electrode is tip 46 which is earthed via the extruder to which it is bolted. The polymer is thus subjected to the D.C. electric field as it exudes from the die. The lip 45 is coated with, e.g. polytetrafluoroethylene on its surface which contacts the thermoplastic material. A simpler embodiment, not illustrated, is disclosed, where neither of the lips is insulated, but both are earthed via the extruder, and a separate electrode is placed near the die (on two electrodes one above, and one below it) at the desired potential difference. In the examples: (2) and (5) polystyrene or ABS resin is extruded into sheet using the die of Fig. 4; (3) acrylonitrile/butadiene/styrene resin is extruded into sheet using a standard sheet extrusion die both lips of which are earthed, and which has a pair of electrodes placed near the lips, and on either side of the sheet being extruded; and (4), as in (3) but using brass rods of semicircular X-section, and having their edges rounded to reduce the chance of corona discharge. The electrodes are heated by coils. Heating of polymers by high frequency electric fields is excluded.
GB6075070A 1970-12-22 1971-11-24 Treatment of polymeric materials Expired GB1348646A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6075070 1970-12-22

Publications (1)

Publication Number Publication Date
GB1348646A true GB1348646A (en) 1974-03-20

Family

ID=10486020

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6075070A Expired GB1348646A (en) 1970-12-22 1971-11-24 Treatment of polymeric materials

Country Status (8)

Country Link
AU (1) AU3695171A (en)
BE (1) BE777081A (en)
CA (1) CA972319A (en)
DE (1) DE2162857A1 (en)
ES (1) ES398031A1 (en)
FR (1) FR2119546A5 (en)
GB (1) GB1348646A (en)
IT (1) IT945576B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5427662A (en) * 1991-05-10 1995-06-27 N.V. Kema Method for producing an ionomer
CN113635532A (en) * 2021-08-09 2021-11-12 界首市天鸿新材料股份有限公司 PP/PE/PP three-layer co-extrusion lithium battery power diaphragm casting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5427662A (en) * 1991-05-10 1995-06-27 N.V. Kema Method for producing an ionomer
CN113635532A (en) * 2021-08-09 2021-11-12 界首市天鸿新材料股份有限公司 PP/PE/PP three-layer co-extrusion lithium battery power diaphragm casting device
CN113635532B (en) * 2021-08-09 2023-07-28 界首市天鸿新材料股份有限公司 PP/PE/PP three-layer co-extrusion lithium battery power diaphragm casting device

Also Published As

Publication number Publication date
CA972319A (en) 1975-08-05
FR2119546A5 (en) 1972-08-04
IT945576B (en) 1973-05-10
BE777081A (en) 1972-06-21
ES398031A1 (en) 1976-03-16
AU3695171A (en) 1973-06-21
DE2162857A1 (en) 1972-07-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee