US3914211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for modifying diene polymers
Assignee: Shell USA Inc
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Filing: 1973-02-28
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Granted: 1975-10-21
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Expires: 1993-02-28
Abstract
Abstract A process is described for modifying diene polymers with a monosubstituted hydroxyl amine to products having improved mechanical properties in the unvulcanized state.
Inventors
- 👤 Anne C Udding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:28
CPC Classifications
C; C08; C08C; C08C19/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A PROCESS FOR MODIFYING POLYISOPRENE INTO PRODUCTS WHICH CAN BE PROCESSED WITH A FILLER TO UNVULACANIZED POLYMERS HAVING IMPROVED MECHANICAL PROPERTIES WHICH PROCESS COMPRISES REACTING SAID POLYMER WITH FROM ABOUT 0.05 TO ABOUT 5 PERCENT BY WEIGHT ON POLYMER OF A MONO ARYL HYDROXYLAMINE DERIVATIVE OF UP TO FOURTEEN CARBON ATOMS IN THE ABSENCE OF THOSE AKDEHYDES OR KETONES WHICH IN SITU, FORM NITRONES WITH THE SAID HYDROXYLAMINE DERIVATIVES AT A TEMPERATURE FROM ABOUT 50*-125*C.
Claim 2
Dependent Claim
75 words
A PROCESS FOR MODIFYING POLYISOPRENE INTO PRODUCTS WHICH CAN BE PROCESSED WITH A FILLER TO UNVULACANIZED POLYMERS HAVING IMPROVED MECHANICAL PROPERTIES WHICH PROCESS COMPRISES REACTING SAID POLYMER WITH FROM ABOUT 0.05 TO ABOUT 5 PERCENT BY WEIGHT ON POLYMER OF A MONO ARYL HYDROXYLAMINE DERIVATIVE OF UP TO FOURTEEN CARBON ATOMS IN THE ABSENCE OF THOSE AKDEHYDES OR KETONES WHICH IN SITU, FORM NITRONES WITH THE SAID HYDROXYLAMINE DERIVATIVES AT A TEMPERATURE FROM ABOUT 50*-125*C.
Claim 3
Dependent Claim
12 words
A process as in claim 1, wherein the hydroxylamine derivative is phenylhydroxylamine.
Claim 4
Dependent Claim
14 words
A process as in claim 1 wherein the hydroxylamine derivative is an alkyl-substituted phenylhydroxylamine.
Claim 5
Dependent Claim
16 words
A process as in claim 3, wherein the hydroxylamine derivative is selected from p-tolylhydroxylamine and 2,6-dimethylphenylhydroxylamine.
Claim 6
Dependent Claim
28 words
A process as in claim 1, wherein the amount of hydroxylamine derivative with which the polymers are reacted varies from about 0.1 to about 1.0 percent by weight.
Claim 7
Dependent Claim
24 words
A process as in claim 1 wherein the polymer has an intrinsic viscosity of at least 3 dl/g, as measured in toluene at 25*C.
References Cited (Backward Citations)
US3341487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |