Patent US2058975A successfully refreshed from Google Patents.
US3907752A
Expired / Lapsed
US
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Aromatic nitrile amide polymers
Assignee: Westinghouse Electric Corp
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Filing: 1973-06-28
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Granted: 1975-09-23
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Expires: 1993-06-28
Abstract
Abstract The present invention discloses a new class of linear polymers having the recurring units: in which R and R'' are divalent aromatic groups, at least one of which groups contains at least one or more nitrile groups as substituents. The linear nitrile amide polymers of the present invention preferably include a nitrile group attached to R'' in a position ortho to the -NH- group and have the recurring units: D R A W I N G
Inventors
- 👤 Lawrence W Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:57
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
9 words
A NITRILE AMIDE POLYMER HAVING THE RECURRING STRUCTURAL UNIT
Claim 2
Dependent Claim
9 words
A NITRILE AMIDE POLYMER HAVING THE RECURRING STRUCTURAL UNIT
Claim 3
Dependent Claim
27 words
at least one aromatic diamine having at least one nitrile group ortho to at least one of the amine groups, and B. removing any hydrogen halides formed.
Claim 4
Dependent Claim
27 words
at least one aromatic diamine having at least one nitrile group ortho to at least one of the amine groups, and B. removing any hydrogen halides formed.
Claim 5
Dependent Claim
23 words
A nitrile amide polymer as set forth in claim 1 having an inherent viscosity greater than 0.1 dl/g (0.5% in DMAC at 25*C).
Claim 6
Dependent Claim
25 words
A nitrile amide polymer as set forth in claim 1 having an inherent viscosity from 0.2 to about 2.0 dl/g (0.5% in DMAC at 25*C).
Claim 7
Dependent Claim
8 words
ANITRILE AMIDE POLYMER HAVING THE RECURRING STRUCTURAL UNIT
Claim 8
Dependent Claim
8 words
ANITRILE AMIDE POLYMER HAVING THE RECURRING STRUCTURAL UNIT
Claim 9
Dependent Claim
20 words
A nitrile amide polymer as set forth in claim 4 wherein R contains one or more nitrile groups as substituents.
Claim 10
Dependent Claim
9 words
A nitrile amide polymer having the recurring structural unit
Claim 11
Dependent Claim
9 words
A nitrile amide polymer having the recurring structural unit
Claim 12
Dependent Claim
13 words
A nitrile amide polymer having the of recurring structural units having the formula
Claim 13
Dependent Claim
13 words
A nitrile amide polymer having the of recurring structural units having the formula
Claim 14
Independent Claim
14 words
A method for the preparation of a nitrile amide polymer having the repeating unit
Claim 15
Independent Claim
14 words
A method for the preparation of a nitrile amide polymer having the repeating unit
Claim 16
Dependent Claim
24 words
A nitrile amide polymer as set forth in claim 1 wherein R is selected from the group consisting of m-phenylene, p-phenylene, and mixtures thereof.
Claim 17
Dependent Claim
42 words
A nitrile amide polymer as set forth in claim 4 wherein R is selected from the groups consisting of m-phenylene, p-phenylene, and mixtures thereof and wherein both said R group and the amide aromatic group are not all m-phenylene nor all p-phenylene.
Claim 18
Dependent Claim
21 words
A method as set forth in claim 8 wherein said nitrile amide polymer is prepared by interfacial polycondensation in an emulsion.
References Cited (Backward Citations)
US3516967A
Cited
US3763211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |