US4221699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of extruded polyolefin products
Assignee: Societe Anonyme de Telecommunications SAT
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Filing: 1978-05-01
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Granted: 1980-09-09
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Expires: 1998-05-01
Abstract
Abstract Production of extruded products wherein a polyolefin composition, a volatile, flammable liquid organic peroxide cross-linking agent and an antioxidant are introduced into the inlet of an extruder, with the antioxidant being a thio-bisphenol soluble in the peroxide having a melting point of less than 125° C. of the general formula (R' C.sub.6 H.sub.2 --R" OH).sub.2 S.sub.x wherein x is a whole number equal to 1, 2 or 3. The preferred antioxidant is 2,2'-thio-bis(6-t-butyl-p-cresol).
Inventors
- 👤 Claude J. Arnaud
- 👤 Jean M. Quemner
- 👤 Gaston P. Roche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:23
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/05; B29C48/06; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
108 words
In a method of fabricating extruded products based on crosslinked polyolefin compositions, wherein a volatile and flammable liquid organic peroxide is introduced, as a crosslinking agent, directly at the inlet of an extruder, simultaneously with the introduction of the polyolefin to be crosslinked and an antioxidant, said antioxidant acting as a protective agent, the improvement comprising: employing as said antioxidant a member selected from the group of thio-bisphenols soluble in said peroxide, having a melting point of less than 125° C. of the general formula: (R'C.sub.6 H.sub.2 --R"OH).sub.2 S.sub.x wherein x is a whole number equal to 1, 2 or 3 and R' and R" are each alkyl.
Claim 2
Dependent Claim
108 words
In a method of fabricating extruded products based on crosslinked polyolefin compositions, wherein a volatile and flammable liquid organic peroxide is introduced, as a crosslinking agent, directly at the inlet of an extruder, simultaneously with the introduction of the polyolefin to be crosslinked and an antioxidant, said antioxidant acting as a protective agent, the improvement comprising: employing as said antioxidant a member selected from the group of thio-bisphenols soluble in said peroxide, having a melting point of less than 125° C. of the general formula: (R'C.sub.6 H.sub.2 --R"OH).sub.2 S.sub.x wherein x is a whole number equal to 1, 2 or 3 and R' and R" are each alkyl.
Claim 3
Dependent Claim
29 words
A method according to claim 1 wherein the antioxidant is used in a proportion of 0.15 to 0.35%, by weight, calculated on the basic resin of the polyolefin composition.
Claim 4
Dependent Claim
14 words
A method according to claim 2 wherein the antioxidant has the structural formula: ##STR2##
Claim 5
Dependent Claim
14 words
A method according to claim 1 wherein R' and R" are each lower alkyl.
Claim 6
Dependent Claim
22 words
A method according to claim 4 wherein R' and R" are each selected from the group consisting of methyl, ethyl and tert.-butyl.
Claim 7
Dependent Claim
29 words
A method according to claim 5 wherein the antioxidant is used in a proportion of 0.15 to 0.35%, by weight, calculated on the basic resin of the polyolefin composition.
Claim 8
Dependent Claim
14 words
A method according to claim 6 wherein the antioxidant is premixed with the polyolefin.
Claim 9
Dependent Claim
14 words
A method according to claim 6 wherein the antioxidant is premixed with the peroxide.
Claim 10
Dependent Claim
14 words
A method according to claim 3 wherein the antioxidant is premixed with the polyolefin.
Claim 11
Dependent Claim
14 words
A method according to claim 3 wherein the antioxidant is premixed with the peroxide.
Claim 12
Dependent Claim
77 words
In a method of fabricating extruded products based on cross-linked polyethylene compositons, wherein a volatile and flammable liquid organic peroxide is introduced, as a cross-linking agent, directly at the inlet of an extruder, simultaneously with the introduction of the polyethylene to be cross linked and an antioxidant, said antioxidant acting as a protective agent, the improvement comprising: employing as said antioxidant and antioxidant having a melting point of less than 125° C. and the structural formula: ##STR3##
Claim 13
Dependent Claim
77 words
In a method of fabricating extruded products based on cross-linked polyethylene compositons, wherein a volatile and flammable liquid organic peroxide is introduced, as a cross-linking agent, directly at the inlet of an extruder, simultaneously with the introduction of the polyethylene to be cross linked and an antioxidant, said antioxidant acting as a protective agent, the improvement comprising: employing as said antioxidant and antioxidant having a melting point of less than 125° C. and the structural formula: ##STR3##
Claim 14
Dependent Claim
11 words
The process of claim 11 wherein the organic peroxide is di-t-butylperoxide.
Claim 15
Dependent Claim
14 words
The process of claim 12 wherein the extruded article is insulation for electric cables.
Claim 16
Dependent Claim
21 words
The process of claim 12 wherein the antioxidant is used in a proportion of 0.15 to 0.35%, by weight, of polyethylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |