Patent US3979180A successfully refreshed from Google Patents.
US3979180A
Expired / Lapsed
US
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Stabilized crosslinked polyethylene and ethylene-vinyl acetate
Assignee: Millennium Petrochemicals Inc
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Filing: 1975-09-12
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Granted: 1976-09-07
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Expires: 1995-09-12
Abstract
Abstract Low density polyethylene and mineral-filled ethylene vinyl acetate copolymers are stabilized by using an anti-oxidant combination of a hindered phenol and/or a substituted diphenyl amine, a metal organic thiophosphorus compound and a trace amount of a transition metal salt.
Inventors
- 👤 George E. Lorand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18; C08K5/04; C08K5/09; C08K5/098; C08K5/13; C08K5/14; C08K5/36; C08K5/45; C08K5/46; C08K5/47; C08K5/49; C08K5/5398
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
102 words
A composition comprising (a) a resin selected from the group consisting of unfilled low density polyethylene and mineral filled ethylene-vinyl acetate copolymer, (b) an organic peroxide, and (c) about 0.5 to 1.95 parts per hundered parts of polymer of an anti-oxidant composition, said anti-oxidant composition comprising (1) at least one member of the group of hindered phenol and diarylamine, (2) a metal organic thiophosphate and (3) about 1 to 100 parts per million parts of resin of a transition metal salt selected from the group consisting of cobalt stearate, iron stearate, manganese stearate, nickel stearate, and the trivalent chromium salt of mercaptobenzothiazole.
Claim 2
Dependent Claim
102 words
A composition comprising (a) a resin selected from the group consisting of unfilled low density polyethylene and mineral filled ethylene-vinyl acetate copolymer, (b) an organic peroxide, and (c) about 0.5 to 1.95 parts per hundered parts of polymer of an anti-oxidant composition, said anti-oxidant composition comprising (1) at least one member of the group of hindered phenol and diarylamine, (2) a metal organic thiophosphate and (3) about 1 to 100 parts per million parts of resin of a transition metal salt selected from the group consisting of cobalt stearate, iron stearate, manganese stearate, nickel stearate, and the trivalent chromium salt of mercaptobenzothiazole.
Claim 3
Dependent Claim
32 words
The composition of claim 1 wherein said resin is unfilled low density polyethylene and wherein said transition metal salt is employed in an amount of about 1 to 50 parts per million.
Claim 4
Dependent Claim
40 words
The composition of claim 2 wherein said transition metal salt is selected from the group consisting of cobalt stearate, iron stearate, manganese stearate and nickel stearate and is employed in an amount of about 10 to 20 parts per million.
Claim 5
Dependent Claim
17 words
The composition of claim 3 wherein said amount of stearate salt is about 15 parts per million.
Claim 6
Dependent Claim
31 words
The composition of claim 2 wherein said transition metal salt is the trivalent chromium salt of mercaptobenzothiazole and is employed in an amount of about 7 to 13 parts per million.
Claim 7
Dependent Claim
18 words
The composition of claim 5 wherein said amount of transition metal salt is about 10 parts per million.
Claim 8
Dependent Claim
32 words
The composition of claim 1 wherein said resin is mineral filled ethylene-vinyl acetate copolymer and said transition metal salt is employed in an amount of about 5 to 100 parts per million.
Claim 9
Dependent Claim
40 words
The composition of claim 7 wherein said transition metal salt is selected from the group consisting of cobalt stearate, iron stearate, manganese stearate and nickel stearate, and is employed in an amount of about 25 to 35 parts per million.
Claim 10
Dependent Claim
18 words
The composition of claim 8 wherein said amount of transition metal salt is about 30 parts per million.
Claim 11
Dependent Claim
31 words
The composition of claim 7 wherein said transition metal salt is the trivalent chromium salt of mercaptobenzothiazole and is employed in an amount of about 15 to 25 parts per million.
Claim 12
Dependent Claim
18 words
The composition of claim 10 wherein said amount of transition metal salt is about 20 parts per million.
Claim 13
Dependent Claim
100 words
In a method of stabilizing a composition comprising crosslinkable unfilled low density polyethylene or mineral filled ethylene-vinyl acetate and a peroxide curing agent by adding an anti-oxidant composition thereto, the improvement which comprises employing about 0.5 to 1.95 parts of an anti-oxidant composition comprising (a) at least one member of the group of hindered phenol and diarylamine, (b) a metal organic thiophosphate, and (c) about 1 to 100 parts per million parts of polymer of a transition metal salt selected from the group consisting of cobalt stearate, iron stearate, manganese stearate, nickel stearate, and the trivalent chromium salt of mercaptobenzothiazole.
Claim 14
Dependent Claim
100 words
In a method of stabilizing a composition comprising crosslinkable unfilled low density polyethylene or mineral filled ethylene-vinyl acetate and a peroxide curing agent by adding an anti-oxidant composition thereto, the improvement which comprises employing about 0.5 to 1.95 parts of an anti-oxidant composition comprising (a) at least one member of the group of hindered phenol and diarylamine, (b) a metal organic thiophosphate, and (c) about 1 to 100 parts per million parts of polymer of a transition metal salt selected from the group consisting of cobalt stearate, iron stearate, manganese stearate, nickel stearate, and the trivalent chromium salt of mercaptobenzothiazole.
Claim 15
Dependent Claim
27 words
The method of claim 12 wherein said low density polyethylene is stabilized and wherein 1 to 50 parts per million of said transition metal salt is employed.
Claim 16
Dependent Claim
51 words
The method of claim 13 wherein the amount of said cobalt stearate, iron stearate, manganese stearate or nickel stearate is in the range of about 10 to 20 parts per million and the amount of said trivalent chromium salt is in the range of about 7 to 13 parts per million.
Claim 17
Dependent Claim
31 words
The method of claim 14 wherein the amount of said stearate salt is about 15 parts per million and the amount of said chromium salt is about 10 parts per million.
Claim 18
Dependent Claim
26 words
The method of claim 12 wherein mineral filled ethylene-vinyl acetate is stabilized and wherein about 5 to 100 parts of said transition metal salt is employed.
Claim 19
Dependent Claim
46 words
The method of claim 16 wherein said cobalt stearate, iron stearate, manganese stearate or nickel stearate is used is an amount of about 25 to 35 parts per million and said chromium salt is used in an amount of about 15 to 25 parts per million.
Claim 20
Dependent Claim
35 words
The method of claim 17 wherein said stearate salts are used in an amount of about 30 parts per million and said chromium salt is used in an amount of about 20 parts per million.
Claim 21
Dependent Claim
16 words
The method of claim 16 wherein about 1.05 to 1.95 parts of anti-oxidant composition is employed.
Claim 22
Dependent Claim
16 words
The composition of claim 13 wherein about 0.5 to 1 part of anti-oxidant composition is employed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |