Patent US3903046A successfully refreshed from Google Patents.
US3903046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of shapeable polymers containing N-silyl groups
Assignee: Novartis Corp
•
Filing: 1973-12-11
•
Granted: 1975-09-02
•
Expires: 1993-12-11
Abstract
Abstract The invention relates to a process for the production of shapeable polymers containing N-silyl groups, of the polyamide, polyamide-imide and polyimide type, which polymers can be used for the production of shaped structures such as fibres, films, coatings, adhesives and the like. The polymers obtained by the process of this invention are distinguished by an inherent viscosity of from 0.1 to 4.0 dl/g and by their improved solubility in organic solvents which facilitates the processing of said polymers.
Inventors
- 👤 Gerd Greber
- 👤 Urs Gruber
- 👤 Martin Kuhn
- 👤 Dieter Lohmann
- 👤 Sandor Gati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:01
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/48; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/106
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
PROCESS FOR MAKING A POLYAMIDE OR POLYAMIDE-ACID POLYMER WHICH CONTAINS N-SILYL GROUPS, IS SOUBLE IN ORGANIC SOLVENTS, HAS AN INHERENT VISCOSITY AT A CONCENTRATION OF 0.5 PERCENT BY WEIGHT IN N,N-DIMETHYLFORMAMIDE, N,N-DIMETHYLACETAMIDE OR N-METHYL-PYRROLIDONE, MEASURED AT 25*C, OF 0.1 TO 4.0 DL/G, SAID POLYMER HAVING A RECURRING STRUCTURAL UNIT OF FORMULA I
Claim 2
Dependent Claim
52 words
PROCESS FOR MAKING A POLYAMIDE OR POLYAMIDE-ACID POLYMER WHICH CONTAINS N-SILYL GROUPS, IS SOUBLE IN ORGANIC SOLVENTS, HAS AN INHERENT VISCOSITY AT A CONCENTRATION OF 0.5 PERCENT BY WEIGHT IN N,N-DIMETHYLFORMAMIDE, N,N-DIMETHYLACETAMIDE OR N-METHYL-PYRROLIDONE, MEASURED AT 25*C, OF 0.1 TO 4.0 DL/G, SAID POLYMER HAVING A RECURRING STRUCTURAL UNIT OF FORMULA I
Claim 3
Dependent Claim
19 words
Process according to claim 1, characterised in that bis-trimethylsilylacetamide or N-methyl-N-trimethylsilylacetamide is used as silylating agent of formula XV.
Claim 4
Dependent Claim
50 words
Process according to claim 1, characterised in that a polyamide-acid having the recurring structural unit of formula II is used in which R denotes the benzene ring of the benzophenone ring system, n1 and n2 denote the number 2, and E denotes a benzene ring, a 4,4''-diphenylsulphone or 4,4''-diphenylene radical.
Claim 5
Dependent Claim
45 words
Process according to claim 1, characterised in that a polyamide-acid having the recurring structural unit of formula II is used in which R denotes the benzene ring or the benzophenone ring system, n1 and n2 denote the number 2, and E denotes a 4,4''-diphenylyl-ether radical.
Claim 6
Dependent Claim
48 words
Process according to claim 1, characterised in that a polyamide-acid having the recurring structural unit of formula II is used in which R denotes the benzene ring, n1 denotes the number 2, n2 denotes the number 1, and E denotes a benzene ring, a 4,4''-diphenylylsulphone or 4,4''-diphenylylene radical.
Claim 7
Dependent Claim
43 words
Process according to claim 1, characterised in that a polyamide-acid having the recurring structural unit of formula II is used in which R denotes the benzene ring, n1 denotes the number 2, n2 denotes the number 1, and E denotes a 4,4''-diphenylyl-ether radical.
Claim 8
Dependent Claim
39 words
Process according to claim 1, characterised in that a polyamide having the recurring structural unit of formula II is used in which R and E each denote the benzene ring and n1 and n2 each denote the number 1.
References Cited (Backward Citations)
US3303157A
Cited
US3440204A
Cited
US3392144A
Cited
US3663728A
Cited
US3553282A
Cited
US3673155A
Cited
US3598785A
Cited
US3779990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |