Patent US3888752A successfully refreshed from Google Patents.
US3888752A
Expired / Lapsed
US
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Phosphite ester antioxidants in radiation cured styrene butadiene elastomers
Assignee: Motors Liquidation Co
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Filing: 1973-11-28
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Granted: 1975-06-10
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Expires: 1993-11-28
Abstract
Abstract Certain organic phosphite esters have been shown to be effective antioxidants in a radiation cured styrene-butadiene copolymer system. Such antioxidants are selected from the group consisting of a pentaerythritol diphosphite having the general formula: WHERE R1 and R2 are alkyl groups containing from 12 to 20 carbon atoms, a trithio phosphite having the general formula: WHERE R1, R2 and R3 are alkyl groups containing from 10 to 15 carbon atoms and a hexathio diphosphite having the general formula: WHERE R1R2, R3 and R4 are alkyl groups containing from 10 to 15 carbon atoms and x is from 4 to 8.
Inventors
- 👤 Roger J Eldred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:39
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
IN THE PROCESS OF CROSSLINKING AND CURING A STYRENEBUTADIENE COPOLYMER HAVING A STYRENE TO BUTADIENE WEIGHT RATIO IN THE RANGE 15:85 TO 50:50 BY THE BOMBARDMENT OF HIGH ENERGY ELECTRONS, THE IMPROVEMENT COMPRISING INCORPORATING AN ORGANIC PHOSPHITE ESTER IN THE NONCROSSLINKED STYRENE-BUTADIENE COPOLYMER COMPOSITION PRIOR TO IRRADIATION, SAID ESTER BEING SELECTED FROM THE GROUP CONSISTING OF A PENTEERYTHRITOL DIPHOSPHITE HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
63 words
IN THE PROCESS OF CROSSLINKING AND CURING A STYRENEBUTADIENE COPOLYMER HAVING A STYRENE TO BUTADIENE WEIGHT RATIO IN THE RANGE 15:85 TO 50:50 BY THE BOMBARDMENT OF HIGH ENERGY ELECTRONS, THE IMPROVEMENT COMPRISING INCORPORATING AN ORGANIC PHOSPHITE ESTER IN THE NONCROSSLINKED STYRENE-BUTADIENE COPOLYMER COMPOSITION PRIOR TO IRRADIATION, SAID ESTER BEING SELECTED FROM THE GROUP CONSISTING OF A PENTEERYTHRITOL DIPHOSPHITE HAVING THE GENERAL FORMULA:
Claim 3
Independent Claim
101 words
A method of producing a crosslinked and cured styrene-butadiene copolymer having a styrene-butadiene weight ratio ranging from 15:85 to 50:50 and having resistance to oxidative degradation comprising providing a mixture consisting essentially of an uncrosslinked styrene-butadiene copolymer with a copolymer to said mixture weight fraction ranging from 0.3 to 0.95, a crosslinking monomer with a monomer to said mixture weight fraction ranging from 0.03 to 0.20, a reinforcing filler with a filler to said mixture weight fraction ranging from 0 to 0.50, and an organic phosphite ester antioxidant selected from the group consisting of a pentaerythritol diphosphite having the general formula:
Claim 4
Independent Claim
101 words
A method of producing a crosslinked and cured styrene-butadiene copolymer having a styrene-butadiene weight ratio ranging from 15:85 to 50:50 and having resistance to oxidative degradation comprising providing a mixture consisting essentially of an uncrosslinked styrene-butadiene copolymer with a copolymer to said mixture weight fraction ranging from 0.3 to 0.95, a crosslinking monomer with a monomer to said mixture weight fraction ranging from 0.03 to 0.20, a reinforcing filler with a filler to said mixture weight fraction ranging from 0 to 0.50, and an organic phosphite ester antioxidant selected from the group consisting of a pentaerythritol diphosphite having the general formula:
Claim 5
Dependent Claim
64 words
An electron beam crosslinked styrene-butadiene copolymer composition resistant to oxidative degradation comprising a crosslinked styrene-butadiene copolymer having a styrene to butadiene weight ratio ranging from 15:85 to 50:50, 0 to 50 percent by weight of a reinforcing filler, and 2 to 15 percent by weight of an organic phosphite ester antioxidant selected from the group consisting of a pentaerythritol diphosphite having the general formula:
Claim 6
Dependent Claim
64 words
An electron beam crosslinked styrene-butadiene copolymer composition resistant to oxidative degradation comprising a crosslinked styrene-butadiene copolymer having a styrene to butadiene weight ratio ranging from 15:85 to 50:50, 0 to 50 percent by weight of a reinforcing filler, and 2 to 15 percent by weight of an organic phosphite ester antioxidant selected from the group consisting of a pentaerythritol diphosphite having the general formula:
References Cited (Backward Citations)
US3261804A
Cited
US3057791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |