GB2236755A - Cross-linking of polymers - Google Patents

Cross-linking of polymers Download PDF

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Publication number
GB2236755A
GB2236755A GB8921774A GB8921774A GB2236755A GB 2236755 A GB2236755 A GB 2236755A GB 8921774 A GB8921774 A GB 8921774A GB 8921774 A GB8921774 A GB 8921774A GB 2236755 A GB2236755 A GB 2236755A
Authority
GB
United Kingdom
Prior art keywords
cross
linking
free radicals
polymeric material
trace
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.)
Withdrawn
Application number
GB8921774A
Other versions
GB8921774D0 (en
Inventor
John Richard Murphy
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.)
VACTITE Ltd
Original Assignee
VACTITE 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 VACTITE Ltd filed Critical VACTITE Ltd
Priority to GB8921774A priority Critical patent/GB2236755A/en
Publication of GB8921774D0 publication Critical patent/GB8921774D0/en
Publication of GB2236755A publication Critical patent/GB2236755A/en
Withdrawn legal-status Critical Current

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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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/0261—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using ultrasonic or sonic vibrations
    • 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
    • C08J3/28—Treatment by wave energy or particle radiation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

A method of cross-linking a polymeric material comprises producing free radicals in the material by irradiating it with ultrasound. The polymeric material may be capable of generating the free radicals itself or may include a trace of initiator which is activated by the ultrasonic radiation to generate the free radicals, Use: In-line production of plastics-insulated electric wire.

Description

Cross-linking of Polymers This invention relates to the cross-linking of polymers, and is especially useful in the production of insulated electric wire having a coating of cross-linked polymeric material.
It is known from Japanese Patent Application No. 57-61042 (Furukawa Denki Kogyo K.K.) to use ultrasonic irradiation to promote cross-linking in the extruded polyolefin coating of an electric cable. A silane-grafted polyolefin, or a copolymer of the silane-granted polyolefin with ethylene, is caused to cross-link by silanol condensation using a trace amount of water, in the presence of a silane catalyst. The ultrasonic radiation is applied via a water bath.
The purpose of the invention is to provide a method of inducing rapid, safe cross-linking inexpensively in a polymer, which is capable of use in-line in the production of plastics-insulated electric wire, and which Is not limited to the silane technology of the method described above.
Accordingly, the invention provides a method of cross-linking a polymeric material comprising producing free radicals in the material by irradiating It with ultrasound; the cross-linking proceeds without any other external influence, without the need for trace quantities of water and without a catalyst. The process is therefore more tolerant of a wide range of temperatures, and is less expensive, than has been possible hitherto.
The polymeric material is preferably capable of generating the free radicals itself; alternatively, the material may include a trace of a suitable initiator which is activated by the ultrasonic radiation to generate the appropriate free radicals.

Claims (4)

1. A method of cross-linking a polymeric material comprising producing free radicals in the material by irradiating it with ultrasound.
2. A method according to Claim 1, in which the polymeric material is capable of generating the free radicals itself.
3. A method according to Claim 1, in which the polymeric material includes a trace of a suitable initiator which is activated by the ultrasonic radiation to generate the appropriate free radicals.
4. A polymeric material containing as a trace an initiator capable, on its activation by ultrasound, of generating free radicals which are effective for the cross-linking of the polymeric material.
GB8921774A 1989-09-27 1989-09-27 Cross-linking of polymers Withdrawn GB2236755A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8921774A GB2236755A (en) 1989-09-27 1989-09-27 Cross-linking of polymers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8921774A GB2236755A (en) 1989-09-27 1989-09-27 Cross-linking of polymers

Publications (2)

Publication Number Publication Date
GB8921774D0 GB8921774D0 (en) 1989-11-08
GB2236755A true GB2236755A (en) 1991-04-17

Family

ID=10663669

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8921774A Withdrawn GB2236755A (en) 1989-09-27 1989-09-27 Cross-linking of polymers

Country Status (1)

Country Link
GB (1) GB2236755A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103087262A (en) * 2011-10-28 2013-05-08 江南大学 Sodium alginate-polystyrene copolymer synthesis by using ultrasound method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1201929A (en) * 1966-11-24 1970-08-12 Grace W R & Co Improvements relating to metal-metal bonding
GB1359836A (en) * 1970-09-21 1974-07-10 Fujikura Ltd Method of manufacturing a coated wire and apparatus relevant thereto

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1201929A (en) * 1966-11-24 1970-08-12 Grace W R & Co Improvements relating to metal-metal bonding
GB1359836A (en) * 1970-09-21 1974-07-10 Fujikura Ltd Method of manufacturing a coated wire and apparatus relevant thereto

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JP 56-028221 A *
JP 57-061042 A *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103087262A (en) * 2011-10-28 2013-05-08 江南大学 Sodium alginate-polystyrene copolymer synthesis by using ultrasound method
CN103087262B (en) * 2011-10-28 2015-04-08 江南大学 Sodium alginate-polystyrene copolymer ultrasoundsynthesis method

Also Published As

Publication number Publication date
GB8921774D0 (en) 1989-11-08

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)