US4169115A
Expired / Lapsed
US
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Preparation of block copolymers and products therefrom
Assignee: Dow Chemical Co
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Filing: 1978-05-22
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Granted: 1979-09-25
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Expires: 1998-05-22
Abstract
Abstract Block copolymers of AB or ABA configuration are prepared by anionically polymerizing one component, terminating the living polymer with sulfur or an episulfide and completing polymerization of the remaining block portion by free-radical polymerization.
Inventors
- 👤 Lu H. Tung
- 👤 Grace Y. Lo
- 👤 Billy E. Burgert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:13
CPC Classifications
C; C08; C08F; C08F293/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A method for the preparation of a block copolymer, the step of the method comprising providing an anionically polymerizable monomer or mixtures thereof, polymerizing the monomer or mixture thereof anionically to provide polymer chains having at least one active or living end, contacting said polymer chains with a sulfur compound in a quantity at least sufficient to react with said polymer chain living ends, to thereby terminate the ends with a primary or secondary thiol group, the sulfur compound being selected from the group consisting of elemental sulfur and episulfides of the formula ##STR4## wherein R is hydrogen, alkyl contains 1 to 18 carbons and an aromatic group containing only carbon and hydrogen contacting the thiol terminated polymer chains with a free-radical polymerizable monomer and initiating free-radical polymerizable monomer to thereby provide a block copolymer comprising at least one anionically polymerized block and at least one free-radical initiated block.
Claim 2
Independent Claim
149 words
A method for the preparation of a block copolymer, the step of the method comprising providing an anionically polymerizable monomer or mixtures thereof, polymerizing the monomer or mixture thereof anionically to provide polymer chains having at least one active or living end, contacting said polymer chains with a sulfur compound in a quantity at least sufficient to react with said polymer chain living ends, to thereby terminate the ends with a primary or secondary thiol group, the sulfur compound being selected from the group consisting of elemental sulfur and episulfides of the formula ##STR4## wherein R is hydrogen, alkyl contains 1 to 18 carbons and an aromatic group containing only carbon and hydrogen contacting the thiol terminated polymer chains with a free-radical polymerizable monomer and initiating free-radical polymerizable monomer to thereby provide a block copolymer comprising at least one anionically polymerized block and at least one free-radical initiated block.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the monomer is polymerized anionically in the presence of an organic lithium polymerization initiating compound.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the lithium compound is a polylithium compound.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein the lithium compound is dilithium compound.
Claim 6
Dependent Claim
24 words
A block copolymer of ABA configuration in which A represents a random copolymer of styrene and acrylonitrile and B is a diene elastomer block.
Claim 7
Dependent Claim
24 words
A block copolymer of ABA configuration in which A represents a random copolymer of styrene and acrylonitrile and B is a diene elastomer block.
References Cited (Backward Citations)
US3108994A
Cited
US3265765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |