US3700748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectively hydrogenated block copolymers
Assignee: Shell USA Inc
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Filing: 1970-05-22
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Granted: 1972-10-24
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Expires: 1990-05-22
Abstract
Abstract Block polymers are provided having substantially improved capability of forming stable elastomeric polar derivatives, these block polymers being prepared by block polymerizing a monovinyl arene with butadiene, the butadiene block containing between about 8 and about 80 percent 1,2-structure and thereafter selectively hydrogenating so as to substantially eliminate the unsaturation in the pendant vinyl groups.
Inventors
- 👤 De Loss E Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:23
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/04; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/10; C08C; C08C19/00; C08C19/02; C08F297/00; C08F297/02; C08F297/04; C08L53/00; C08L53/02; C08L53/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
A partially hydrogenated block copolymer according to claim 1 showing substantially no absorbance at 10.98 and 10.05 microns.
Claim 2
Dependent Claim
32 words
A partially hydrogenated block copolymer according to claim 1 having the structure prior to hydrogenation of A-B wherein A is a monovinyl arene polymer block and B is a butadiene polymer block.
Claim 3
Dependent Claim
33 words
A partially hydrogenated block copolymer according to claim 1 having the general structure prior to hydrogenation of A-B-A wherein A is a monovinyl arene polymer block and B is a butadiene polymer block.
Claim 4
Dependent Claim
35 words
A partially hydrogenated block copolymer according to claim 1 having the general structure prior to hydrogenation of A B-A1 5 wherein A is a monovinyl arene polymer block and B is a butadiene polymer block.
Claim 5
Dependent Claim
35 words
A partially hydrogenated block copolymer according to claim 1 having the general structure prior to hydrogenation of A-B B-A1 5 wherein A is a monovinyl arene polymer block and B is a butadiene polymer block.
Claim 6
Dependent Claim
17 words
A partially hydrogenated block copolymer according to claim 6 wherein A is a poly(alpha methyl styrene) block.
Claim 7
Dependent Claim
17 words
A partially hydrogenated block copolymer according to claim 4 having the general structure, prior to hydrogenation polystyrene-polybutadiene-polystyrene.
References Cited (Backward Citations)
US3431323A
Cited
US3526606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |