GB1186146A - Cross-Linking Polyolefins. - Google Patents
Cross-Linking Polyolefins.Info
- Publication number
- GB1186146A GB1186146A GB825868A GB825868A GB1186146A GB 1186146 A GB1186146 A GB 1186146A GB 825868 A GB825868 A GB 825868A GB 825868 A GB825868 A GB 825868A GB 1186146 A GB1186146 A GB 1186146A
- Authority
- GB
- United Kingdom
- Prior art keywords
- free
- crystalline
- polyolefin
- cross
- radical generator
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Graft Or Block Polymers (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
1,186,146. Cross-linking polyolefins. IMPERIAL CHEMICAL INDUSTRIES Ltd. 29 Jan., 1969 [20 Feb., 1968], No. 8258/68. Heading C3P. A process for the preparation of a cross-linked polyolefin, e.g. polyethylene, comprises the steps of (i) incorporating into a crystalline polyolefin a thermally activatable free-radical generator which is dissociable below the crystalline melting point of the polyolefin, by immersing the crystalline polyolefin in a solution of a freeradical generator in a solvent therefor, e.g. xylene, which solvent has a swelling or at least partial solvation effect on the crystalline polyolefin, (ii) heat treating the composition so obtained to cause cross-linking, and (iii) repeating steps (i) and (ii) at least once, and in the process the incorporation of the free-radical generator and the heat treatment of the composition are effected below the crystalline melting point of the polyolefin and the incorporation of the free-radical generator is also effected at a temperature at which little or no thermal decomposition of the free-radical generator occurs. Free-radical generators: benzoyl peroxide, lauroyl peroxide, dicumyl peroxide, 2,5-dimethyl - 2,5 - di - (t - butyl - peroxy) - hexyne - 3 and azobis(isobutyronitrile). The solvent of the free-radical generator may be a polymerizable polyene, as exemplified by the alkyl esters of acrylic, methacrylic, maleic, fumaric and itaconic acids, diallyl esters of sebacic and phthalic acids, diacrylates and dimethylacrylates of glycols, and divinyl benzenes. Examples disclose the repeated soaking of moulded sheets of crystalline high density polyethylene in a solution of dicumyl peroxide in allyl methacrylate for 5 hours at 60‹ C. and heating the sheets for 18 hours at 120‹ C. to decompose the peroxide. Cross-linked polyolefins obtained by the process exhibited better resistance to creep at elevated temperatures and higher heat distortion temperatures, e.g. 130‹ C. or more, than the uncross-linked polyolefines. Thin section pipes, tubes, fibres and films of crystalline polyolefins or the surface layer of shaped articles of greater thickness may be treated.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB825868A GB1186146A (en) | 1968-02-20 | 1968-02-20 | Cross-Linking Polyolefins. |
| DE19691908319 DE1908319A1 (en) | 1968-02-20 | 1969-02-19 | Process for producing a crosslinked polyolefin and its use |
| FR6904361A FR2002291A1 (en) | 1968-02-20 | 1969-02-20 | Cross linking crystalline polyolefins |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB825868A GB1186146A (en) | 1968-02-20 | 1968-02-20 | Cross-Linking Polyolefins. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1186146A true GB1186146A (en) | 1970-04-02 |
Family
ID=9849061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB825868A Expired GB1186146A (en) | 1968-02-20 | 1968-02-20 | Cross-Linking Polyolefins. |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1908319A1 (en) |
| FR (1) | FR2002291A1 (en) |
| GB (1) | GB1186146A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2177703A (en) * | 1985-07-12 | 1987-01-28 | Ass Elect Ind | Extruded products and the manufacture thereof |
-
1968
- 1968-02-20 GB GB825868A patent/GB1186146A/en not_active Expired
-
1969
- 1969-02-19 DE DE19691908319 patent/DE1908319A1/en active Pending
- 1969-02-20 FR FR6904361A patent/FR2002291A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2177703A (en) * | 1985-07-12 | 1987-01-28 | Ass Elect Ind | Extruded products and the manufacture thereof |
| GB2177703B (en) * | 1985-07-12 | 1989-09-20 | Ass Elect Ind |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1908319A1 (en) | 1969-09-11 |
| FR2002291A1 (en) | 1969-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FR2508047B1 (en) | PROCESS FOR TREATING LOW LINEAR DENSITY POLYETHYLENE WITH ORGANIC PEROXIDES, FREE RADICAL GENERATORS | |
| Şanli et al. | Solvent‐assisted graft copolymerization of acrylamide on poly (ethylene terephthalate) films using benzoyl peroxide initiator | |
| PT80826A (en) | Process for the preparation of crosslinkable thermoplastic polymeric compositions | |
| GB1078425A (en) | Process for producing a multicellular synthetic resin structure | |
| GB1277057A (en) | Preparation of grafted copolymers from crystalline polyolefines | |
| GB1186146A (en) | Cross-Linking Polyolefins. | |
| US3137674A (en) | Polyethylene modified with a vinyl compound | |
| GB1005801A (en) | Improvements in and relating to treatment of fluoro-polymers | |
| ES362833A1 (en) | Method of producing articles of cross-linked polyethylene | |
| US3143521A (en) | Process for graft-copolymerizing | |
| JPH0524109A (en) | Manufacture of heat-shrinkable tube | |
| US2979447A (en) | Process for the preparation of graft copolymers | |
| US3640838A (en) | Ionically interacting polymers | |
| US5208286A (en) | Cross-linkable ethylene-vinyl alcohol-acrylate polymer and method of producing the same | |
| US3056169A (en) | Process of preparing shaped articles of acrylonitrile polymer containing silver insoluble particles | |
| JPS59152913A (en) | Surface modification of polymeric material | |
| GB899342A (en) | Polymeric products | |
| GB1047053A (en) | Blending process | |
| GB885470A (en) | Cross-linked alpha-olefin polymers and process for preparing them | |
| ES350828A1 (en) | Process for interpolymerzing methyl methacrylate with ehtylene copolymers | |
| ES241479A1 (en) | A procedure to treat a polymer (Machine-translation by Google Translate, not legally binding) | |
| JPS6038441A (en) | Dyeing of surface of polymeric material | |
| GB1035601A (en) | Process of producing cross-linked graft polymers of vinyl chloride | |
| GB998979A (en) | Improvements in or relating to polymerisation processes and products resulting therefrom | |
| SU427963A1 (en) | METHOD FOR REDUCING THE ELECTRIZATION OF THERMOPLASTIC POLYMERS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |