US3686366A
Expired / Lapsed
US
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Hydrohalogenated selectively hydrogenated block copolymers
Assignee: Shell USA Inc
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Filing: 1970-07-22
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Granted: 1972-08-22
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Expires: 1990-07-22
Abstract
Abstract Block copolymers of improved fire resistance are provided by block polymerizing a monovinyl arene with butadiene, the butadiene polymer block containing between about 20 percent and about 60 percent 1,2 microstructure, then selectively partially hydrogenating so as to eliminate at least about 50 percent of the 1,2 unsaturation and no more than about 50 percent of the 1,4 unsaturation and thereafter reacting substantially completely with a hydrogen halide. The monovinyl arene polymer blocks are essentially unreactive toward hydrogen or hydrogen halide under the conditions used.
Inventors
- 👤 Deloss E Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:05
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
A hydrohalogenated and partially hydrogenated block copolymer according to claim 1 having a structure prior to hydrogenation and hydrohalogenation of A-B wherein A is a monovinyl arene polymer block and B is a butadiene polymeR block.
Claim 2
Dependent Claim
37 words
A partially hydrogenated and hydrohalogenated block copolymer according to claim 1 having the general structure prior to hydrogenation and hydrohalogenation of A-B-A wherein A is a monovinyl arene polymer block and B is a butadiene polymer block.
Claim 3
Dependent Claim
38 words
A partially hydrogenated and hydrohalogenated block copolymer according to claim 1 having the general structure prior to hydrogenation and hydrohalogenation of A-(-B-A)1 5 wherein A is a monovinyl arene polymer block and B is a butadiene polymer block.
Claim 4
Dependent Claim
38 words
A partially hydrogenated and hydrohalogenated block copolymer according to claim 1 having the general structure prior to hydrogenation and hydrohalogenation of A-B-(-B-A)1 5 wherein A is a monovinyl arene polymer block and B is a butadiene polymer block.
Claim 5
Dependent Claim
20 words
A partially hydrogenated and hydrohalogenated block polymer according to claim 5 in which each A is a poly (alphamethylstyrene) block.
Claim 6
Dependent Claim
21 words
A partially hydrogenated and hydrohalogenated block polymer according to claim 1 having the structure prior to hydrogenation and hydrohalogenation of polystyrene-polybutadiene-polystyrene.
References Cited (Backward Citations)
US3431323A
Cited
US3452118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |