Patent US4461874A successfully refreshed from Google Patents.
US4461874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers of conjugated dienes or vinyl substituted aromatic hydrocarbons and acrylic esters and process for their manufacture
Assignee: Labofina SA
•
Filing: 1982-10-01
•
Granted: 1984-07-24
•
Expires: 2002-10-01
Abstract
Abstract Block copolymers having a first sequence formed with a conjugated diene or a vinyl substituted aromatic hydrocarbon other than alpha-methylstyrene, a second sequence formed with an acrylic ester, and a linking intermediate sequence formed with alpha-methylstyrene. An anionic polymerization process is used to form these block copolymers.
Inventors
- 👤 Philippe Teyssie
- 👤 Robert Jerome
- 👤 Trazollah Ouhadi
- 👤 Roger Fayt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:28
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/026
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
60 words
Linear block coploymers comprising a first sequence formed with monomeric units derived from the group consisting of a conjugated diene and a vinyl substituted aromatic hydrocarbon other than alpha-methylstyrene; and a second sequence formed with monomeric units derived from an acrylic ester, the first and second sequences being linked by an intermediate sequence formed with monomeric units derived from alpha-methylstyrene.
Claim 2
Dependent Claim
60 words
Linear block coploymers comprising a first sequence formed with monomeric units derived from the group consisting of a conjugated diene and a vinyl substituted aromatic hydrocarbon other than alpha-methylstyrene; and a second sequence formed with monomeric units derived from an acrylic ester, the first and second sequences being linked by an intermediate sequence formed with monomeric units derived from alpha-methylstyrene.
Claim 3
Dependent Claim
19 words
The block copolymers according to claim 1, wherein the first sequence is formed with monomeric units derived from styrene.
Claim 4
Dependent Claim
19 words
The block copolymers according to claim 1, wherein the first sequence is formed with monomeric units derived from isoprene.
Claim 5
Dependent Claim
19 words
The block copolymers according to claim 1, wherein the first sequence is formed with monomeric units derived from 1,3-butadiene.
Claim 6
Dependent Claim
20 words
The block copolymers according to claim 1 wherein the second sequence is formed with monomeric units derived from methyl methacrylate.
Claim 7
Dependent Claim
20 words
The block copolymer according to claim 2 wherein the second sequence is formed with monomeric units derived from methyl methacrylate.
Claim 8
Dependent Claim
20 words
The block copolymer according to claim 3 wherein the second sequence is formed with monomeric units derived from methyl methacrylate.
Claim 9
Dependent Claim
20 words
The block copolymer according to claim 4 wherein the second sequence is formed with monomeric units derived from methyl methacrylate.
Claim 10
Dependent Claim
46 words
A process for making the block copolymers of claim 1, comprising successively polymerizing, by anionic polymerization, monomeric units derived from the group consisting of a conjugated diene and a vinyl substituted aromatic hydrocarbon other than alpha-methylstyrene, monomeric units of alpha-methylstyrene, and monomeric units of acrylic esters.
Claim 11
Dependent Claim
38 words
The process according to claim 9 wherein the monomeric units derived from the group consisting of a conjugated diene and a vinyl substituted aromatic hydrocarbon other than alpha-methylstyrene have a polymerization rate much higher than that of alpha-methylstyrene.
Claim 12
Dependent Claim
21 words
The process according to claims 9 or 10 additionally comprising adding an alkaline compound derived from alphamethylstyrene to initiate block polymerization.
Claim 13
Dependent Claim
26 words
The process according to claim 11 wherein the alkaline compound derived from alpha-methylstyrene is synthesized by adding alpha-methylstyrene in at least an equimolar amount to butyllithium.
References Cited (Backward Citations)
US3198854A
Cited
US3739042A
Cited
US3699190A
Cited
US3890408A
Cited
US3937760A
Cited
US4169115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |