Patent US4405772A successfully refreshed from Google Patents.
US4405772A
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Butene-1/4-vinylcyclohexene copolymer
Assignee: Shell USA Inc
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Filing: 1982-06-23
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Granted: 1983-09-20
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Expires: 2002-06-23
Abstract
Abstract Solid copolymers of butene-1 and 4-vinylcyclohexene prepared by copolymerizing the monomers in the presence of a titanium halide coordination catalyst have an unobvious balance of properties including a broader molecular weight distribution, shorter crystallization half-time, greater isotacticity and greater crystallinity than butene-1 homopolymers prepared with identical catalysts.
Inventors
- 👤 Pui K. Wong
- 👤 Carl L. Willis
- 👤 Thomas F. Brownscombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:11
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/20; C08F210/00; C08F210/04; C08F210/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A solid copolymer of butene-1 and about 0.1 and about 2.0 mole percent 4-vinylcyclohexene, prepared by copolymerizing said butene-1 monomer and said 4-vinylcyclohexene monomer in the presence of a titanium halide coordination catalyst, said copolymer having an initial form II crystalline state which transforms to a stable form I crystalline state, and, as compared to butene-1 homopolymers prepared with identical catalysts, a broader molecular weight distribution, shorter cyrstallization half-time, greater isotacticity as measured by 13 C NMR and greater crystallinity as measured by x-ray diffraction.
Claim 2
Dependent Claim
85 words
A solid copolymer of butene-1 and about 0.1 and about 2.0 mole percent 4-vinylcyclohexene, prepared by copolymerizing said butene-1 monomer and said 4-vinylcyclohexene monomer in the presence of a titanium halide coordination catalyst, said copolymer having an initial form II crystalline state which transforms to a stable form I crystalline state, and, as compared to butene-1 homopolymers prepared with identical catalysts, a broader molecular weight distribution, shorter cyrstallization half-time, greater isotacticity as measured by 13 C NMR and greater crystallinity as measured by x-ray diffraction.
Claim 3
Dependent Claim
16 words
The copolymer of claim 1 wherein said copolymer has a Q value of 13 or greater.
Claim 4
Dependent Claim
15 words
The copolymer of claim 1 wherein said catalyst is a titanium trichloride/trialkyl aluminum coordination catalyst.
Claim 5
Dependent Claim
15 words
The copolymer of claim 3 wherein said catalyst is a titanium trichloride/triethyl aluminum coordination catalyst.
Claim 6
Dependent Claim
16 words
The copolymer of claim 1 wherein said catalyst is a titanium trichloride/diethyl aluminum chloride coordination catalyst.
Claim 7
Dependent Claim
14 words
The copolymer of claims 3 or 5 wherein hydrogen is present during said copolymerization.
References Cited (Backward Citations)
GB1101435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |