US3852252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of high molecular weight polymers to reduce hydrogenation conditions
Assignee: Phillips Petroleum Co
•
Filing: 1970-10-26
•
Granted: 1974-12-03
•
Expires: 1990-10-26
Abstract
Abstract The severity of hydrogenation conditions of temperature, pressure and catalyst consumption required by high molecular weight elastomeric, thermoplastic and thermosetting polymers can be substantially reduced by pretreating the polymer with molecular sieves before hydrogenation.
Inventors
- 👤 A Devault
- 👤 M Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:42
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/02; C08C19/00; C08C19/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A METHOD FOR HYDROGENATING AN UNSATURATED BUTADIENE/S TYRENE COPOLYMER, WHICH COMPRISES: A. DIPERSING SAID BUTADIENE/STYRENE COPOLYMER IN HYDROCARBON SOLVENT, THEREBY FORMING A SOLUTION OF SAID COPOLYMER AND SAID SOLVENT, B. CONTACTING SAID SOLUTION FROM SAID STEP (A) WITH A MOLECULAR SIEVE HAVING AN EFFECTIVE PORE DIAMETER OF FROM ABOUT 8 TO ABOUT 12 ANGSTROM UNITS, UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AT A TEMPERATURE OF FROM ABOUT 0* TO 150*F., A PRESSURE OF FROM ABOUT 0.500 PSIG, AND A SPACE VELOCITY OF FROM ABOUT 0.1 TO 50 LIQUID VOLUMES PER VOLUME OF SAID MOLECULAR SIEVE PER HOUR, AND C. HYDROGENATING THE TREATED SOLUTION FROM SAID STEP (B), WHEREIN THE SAID HYDROGENATION STEP (C) IS CONDUCTED WITH A NICKEL OCTOATE-TRIETHYLALUMINUM CATALYST.
Claim 2
Independent Claim
118 words
A METHOD FOR HYDROGENATING AN UNSATURATED BUTADIENE/S TYRENE COPOLYMER, WHICH COMPRISES: A. DIPERSING SAID BUTADIENE/STYRENE COPOLYMER IN HYDROCARBON SOLVENT, THEREBY FORMING A SOLUTION OF SAID COPOLYMER AND SAID SOLVENT, B. CONTACTING SAID SOLUTION FROM SAID STEP (A) WITH A MOLECULAR SIEVE HAVING AN EFFECTIVE PORE DIAMETER OF FROM ABOUT 8 TO ABOUT 12 ANGSTROM UNITS, UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AT A TEMPERATURE OF FROM ABOUT 0* TO 150*F., A PRESSURE OF FROM ABOUT 0.500 PSIG, AND A SPACE VELOCITY OF FROM ABOUT 0.1 TO 50 LIQUID VOLUMES PER VOLUME OF SAID MOLECULAR SIEVE PER HOUR, AND C. HYDROGENATING THE TREATED SOLUTION FROM SAID STEP (B), WHEREIN THE SAID HYDROGENATION STEP (C) IS CONDUCTED WITH A NICKEL OCTOATE-TRIETHYLALUMINUM CATALYST.
Claim 3
Dependent Claim
38 words
The process of claim 1 wherein said solution consists of from about 3 to about 30 weight per cent high molecular weight butadiene-styrene copolymer in cyclohexane, and said copolymer has a molecular weight of from 25,000 to 125,000.
Claim 4
Dependent Claim
57 words
The process of claim 2 wherein said contacting step (b) is carried out at a temperature of from about 70* to about 120* F., a pressure sufficient to maintain said solution in a substantially liquid condition, and a space velocity of from about 0.5 to about 20 liquid volume per volume of said molecular sieve per hour.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |