Patent US4455406A successfully refreshed from Google Patents.
US4455406A
Expired / Lapsed
US
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High- and medium-density extrudable and crosslinkable polyethylene compositions
Assignee: IFP Energies nouvelles
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Filing: 1983-02-18
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Granted: 1984-06-19
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Expires: 2003-02-18
Abstract
Abstract High- and medium density polyethylene compositions become extrudable and cross-linkable during the extrusion step by incorporating therein a free radical generator and an additive for plasticizing the polyethylene composition, at a relatively low extrusion temperature insufficient to decompose the free radicals generator, consisting of a C14 to C24 n-alkyl acrylate polymer having an average molecular weight by number of from 500 to 50,000, used in a proportion from 0.5 to 10% by weight.
Inventors
- 👤 Anne-Marie Bergault
- 👤 Gerard Bonavent, deceased
- 👤 Jacques Jarrin
- 👤 Marc Mollard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:12
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L2312/00; C08L33/00; C08L33/04; C08L33/06; C08L33/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
85 words
An extrudable and crosslinkable composition, which comprises: (a) a major proportion of a polyolefin which is a high- or medium-density polyethylene or a copolymer of ethylene units and less than 5% of C 3 to C 8 olefin units, (b) a minor proportion of at least one free radical generator compound, and (c) a proportion from 0.5 to 10% by weight of at least one C 14 to C 24 n-alkyl acrylate polymer, having an average molecular weight by number of from 500 to 50,000.
Claim 2
Dependent Claim
85 words
An extrudable and crosslinkable composition, which comprises: (a) a major proportion of a polyolefin which is a high- or medium-density polyethylene or a copolymer of ethylene units and less than 5% of C 3 to C 8 olefin units, (b) a minor proportion of at least one free radical generator compound, and (c) a proportion from 0.5 to 10% by weight of at least one C 14 to C 24 n-alkyl acrylate polymer, having an average molecular weight by number of from 500 to 50,000.
Claim 3
Dependent Claim
24 words
A composition according to claim 1, wherein said polyolefin is a high- or medium-density polyethylene having an average molecular weight from 50,000 to 700,000.
Claim 4
Dependent Claim
23 words
A composition according to claim 1, wherein said polyolefin has a branching rate lower than 2.5 CH 3 groups per 1,000 carbon atoms.
Claim 5
Dependent Claim
22 words
A composition according to claim 1, wherein the free radical generator compound has a decomposition temperature ranging from 140° to 280° C.
Claim 6
Dependent Claim
28 words
A composition according to claim 1, wherein the proportion of the free radical generator compound is from 0.3 to 5% by weight with respect to the polyolefin weight.
Claim 7
Dependent Claim
22 words
A composition according to claim 1, wherein said n-alkyl polyacrylate has an average molecular weight by number of from 1,000 to 20,000.
Claim 8
Dependent Claim
26 words
A composition according to claim 1, wherein the proportion of said n-alkyl polyacrylate is from 1 to 5% by weight with respect to the polyolefin weight.
Claim 9
Dependent Claim
15 words
A composition according to claim 1, which further comprises a minor proportion of co-crosslinking agent.
Claim 10
Dependent Claim
20 words
A composition according to claim 1, wherein further comprises at least one ingredient selected from anti-oxidant additives, dyestuffs and fillers.
Claim 11
Dependent Claim
60 words
A process for manufacturing an extruded and cross-linked material, which comprises a first step of extruding a composition according to claim 1, at temperatures lower than the decomposition temperature of said free radical generator compound, and a second step of subjecting the extruded product to a temperature at least equal to the decomposition temperature of the free radical generator compound.
Claim 12
Dependent Claim
13 words
An extruded and cross-linked product obtained by the process according to claim 10.
Claim 13
Dependent Claim
16 words
An extruded and cross-linked product according to claim 11, consisting of a tube of large diameter.
References Cited (Backward Citations)
US2412475A
Cited
US3171866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |