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Patent US3676407A successfully refreshed from Google Patents.
US3676407A
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Tetrapolymers and process for production thereof
Assignee: Phillips Petroleum Co
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Filing: 1970-09-23
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Granted: 1972-07-11
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Expires: 1990-09-23
Abstract
Abstract Tetrapolymers, which can be used as adhesives and as terminating agents for lithium initiated polymerizations, are prepared by polymerizing a mixture of an oxirane, a cyclic ether, an organic acid anhydride, and a monoisocyanate in the presence of an organometal compound.
Inventors
- 👤 Henry L Hsieh
- 👤 Ollie G Buck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/71; C08G18/003; C08G18/28; C08G18/40; C08G18/42; C08G18/4291; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
The process of claim 1 wherein said molar ratio is in the range of 1:1:1.
Claim 2
Dependent Claim
22 words
The process of claim 2 wherein an excess quantity of said cyclic ether is utilized in said reaction zone as a diluent.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein said temperature is in the range of 30* to 500* F., said time is in the range from 1 minute to 240 hours, and said catalyst is triisobutylaluminum.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein said cyclic ether is tetrahydrofuran, said anhydride is phthalic anhydride, said oxirane is epichlorohydrin, and said monoisocyanate is phenylisocyanate.
Claim 5
Dependent Claim
11 words
The process of claim 5 wherein said anhydride is succinic anhydride.
Claim 6
Dependent Claim
9 words
The tetrapolymer produced according to the process of claim
Claim 7
Dependent Claim
10 words
The tetrapolymer produced according to the process of claim 5.
Claim 8
Dependent Claim
10 words
The tetrapolymer produced according to the process of claim 6.
References Cited (Backward Citations)
US3317480A
Cited
US3488297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |