US3607982A
Expired / Lapsed
US
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Hydroxylated block copolymers of butadiene and isoprene
Assignee: Shell USA Inc
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Filing: 1970-06-17
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Granted: 1971-09-21
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Expires: 1990-06-17
Abstract
Abstract Novel epoxidized block copolymers and novel hydroxylated products derived from them are prepared by epoxidation, and then hydrolysis, of conjugated diene block copolymers. In the selectively epoxidized polymers at least one highly (80-100 percent) epoxidized polymer block A, formed from a branched chain conjugated diene, is attached to at least one polymer block B, formed from a straight chain conjugated diene that is less than about 50 percent epoxidized. Hydroxylated products are prepared by acid hydrolysis of the epoxidized copolymers.
Inventors
- 👤 Deloss E Winkler
- 👤 Alfred W Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:27
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/04; C08C19/06; C08F; C08F8/00; C08F8/08; C08F8/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
An elastomeric block copolymer according to claim 1 having the general configuration A-B-B-A)n wherein n is an integer from 0 to 8.
Claim 2
Dependent Claim
26 words
A block copolymer according to claim 2 having the general configuration A-B-A wherein the block A monomer is isoprene and the block B monomer is butadiene.
Claim 3
Dependent Claim
17 words
A block copolymer according to claim 1 wherein the diene monomers contain minor amounts of monovinyl arene.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |