US4126738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of 5-norbornene 2,3-dicarboxylic anhydride and maleic anhydride
Assignee: GE Chemicals Inc
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Filing: 1977-04-04
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Granted: 1978-11-21
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Expires: 1997-04-04
Abstract
Abstract Novel copolymers of maleic anhydride and the endo and exo cyclic adducts of maleic anhydride and cyclic conjugated dienes such as cyclopentadiene. The copolymers are prepared by heating either of the cyclic adducts and maleic anhydride in the presence of a free radical precursor, such as a peroxygen compound, at a temperature at which endo-exo isomerization of the adduct occurs.
Inventors
- 👤 Norman G. Gaylord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:16
CPC Classifications
C; C08; C08F; C08F234/00; C08F234/02; C08F222/00; C08F222/04; C08F222/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
66 words
A terpolymer of maleic anhydride and the exo and endo cyclic adducts of maleic anhydride and a cyclic conjugated diene, said diene selected from the group consisting of cyclopentadiene and methylcyclopentadiene, said terpolymer prepared by heating maleic anhydride and one of said cyclic adducts in the presence of a free radical precursor at a reaction temperature which is a temperature of endo-exo isomerization of the adduct.
Claim 2
Dependent Claim
66 words
A terpolymer of maleic anhydride and the exo and endo cyclic adducts of maleic anhydride and a cyclic conjugated diene, said diene selected from the group consisting of cyclopentadiene and methylcyclopentadiene, said terpolymer prepared by heating maleic anhydride and one of said cyclic adducts in the presence of a free radical precursor at a reaction temperature which is a temperature of endo-exo isomerization of the adduct.
Claim 3
Dependent Claim
67 words
A process for the preparation of terpolymers of maleic anhydride and the exo and endo cyclic adducts of maleic anhydride and a cyclic conjugated diene, said diene selected from the group consisting of cyclopentadiene and methylcyclopentadiene, which comprises heating maleic anhydride and either cyclic adduct in the presence of a free radical precursor, at a reaction temperature which is a temperature of endo-exo isomerization of the adduct.
Claim 4
Dependent Claim
67 words
A process for the preparation of terpolymers of maleic anhydride and the exo and endo cyclic adducts of maleic anhydride and a cyclic conjugated diene, said diene selected from the group consisting of cyclopentadiene and methylcyclopentadiene, which comprises heating maleic anhydride and either cyclic adduct in the presence of a free radical precursor, at a reaction temperature which is a temperature of endo-exo isomerization of the adduct.
Claim 5
Dependent Claim
12 words
The process of claim 2 where said adduct is the endo isomer.
Claim 6
Dependent Claim
12 words
The process of claim 2 where said adduct is the exo isomer.
Claim 7
Dependent Claim
17 words
The process of claim 2 where said adduct is a mixture of the endo and exo isomers.
Claim 8
Dependent Claim
14 words
The process of claim 2 where said free radical precursor is a peroxygen compound.
Claim 9
Dependent Claim
20 words
The process of claim 6 where said peroxygen compound is selected from the group consisting of peroxides, peresters and hydroperoxides.
Claim 10
Dependent Claim
18 words
The process of claim 2 where the reaction is carried out in the presence of an inert solvent.
Claim 11
Dependent Claim
26 words
The process of claim 2 where said free radical precursor is added to the mixture of maleic anhydride and the cyclic adduct at the reaction temperature.
Claim 12
Dependent Claim
15 words
The process of claim 2 where said reaction temperature is between 170° and 300° C.
Claim 13
Dependent Claim
13 words
The process of claim 2 where said reaction temperature is above 200° C.
References Cited (Backward Citations)
US2359038A
Cited
US3838113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |