US4308364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lactones from gamma-hydroxy acids as coupling agents
Assignee: Phillips Petroleum Co
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Filing: 1980-10-23
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Granted: 1981-12-29
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Expires: 2000-10-23
Abstract
Abstract Lactones derived from gamma-hydroxy acids are employed as coupling agents for polymers derived from alkali metal-initiated polymerizations. These coupling agents provide effective coupling without formation of undesirable by-products.
Inventors
- 👤 Kishore Udipi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:10
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/14; C08F8/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
A process of coupling an alkali metal-terminated polymer derived from the solution polymerization of at least one conjugated diene, monovinylarene, or both, wherein the improvement comprises employing an effective amount of at least one lactone derived from an γ-hydroxy acid in coupling said alkali-metal terminated polymer.
Claim 2
Dependent Claim
46 words
A process of coupling an alkali metal-terminated polymer derived from the solution polymerization of at least one conjugated diene, monovinylarene, or both, wherein the improvement comprises employing an effective amount of at least one lactone derived from an γ-hydroxy acid in coupling said alkali-metal terminated polymer.
Claim 3
Dependent Claim
84 words
The process according to claim 1 wherein said lactone is represented by ##STR4## wherein R' is selected from the group consisting of hydrogen, halogen, alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl, wherein said halogen is chlorine or bromine; each R 2 is selected from the group consisting of R' other than halogen; R 3 is R 2 or a radical of the structure ##STR5## such that when R 3 is ##STR6## no R 2 is attached to the carbon atom to which said radical is attached.
Claim 4
Dependent Claim
30 words
The process according to claim 2 wherein the number of carbon atoms in the total R' plus R 2 plus R 3 is in the range of 1 to 12.
Claim 5
Dependent Claim
31 words
The process according to claim 3 wherein said lactone is selected from the group consisting of γ-butyrolactone, α-bromo-γ-butyrolactone, α-chloro-γ-valerolactone, γ-valerolactone, γ-(n-pentyl)-γ-butyrolacetone, γ-(n-octyl)-γ-butyrolactone, γ-methyl-γ-valerolactone, γ-phenyl-γ-valerolactone, γ-caprolactone, β-ethyl-γ-caprolacetone, α-methyl-γ-butyrolactone, β-ethyl-γ-valerolactone, γ-isopropylidene-γ-butyrolactone, and mixtures.
Claim 6
Dependent Claim
23 words
The process according to claim 3 wherein said effective amount of said lactone is in the range of about 0.03 to 20 mhm.
Claim 7
Dependent Claim
30 words
The process of claim 5 wherein said polymer is a conjugated diene homopolymer, conjugated diene copolymers, or a copolymers of at least one conjugated diene with at least one monovinylarene.
Claim 8
Dependent Claim
14 words
The process of claim 6 wherein said conjugated diene polymer is a butadiene/styrene copolymer.
Claim 9
Dependent Claim
10 words
The process of claim 7 wherein said lactone is γ-butyrolactone.
Claim 10
Dependent Claim
10 words
The process of claim 7 wherein said lactone is α-bromo-γ-butyrolactone.
References Cited (Backward Citations)
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US3627745A
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US3764639A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |