Patent US4247672A successfully refreshed from Google Patents.
US4247672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-curable mixtures based on polyimides and poly-β-iminocrotononitriles
Assignee: Novartis Corp
•
Filing: 1979-07-16
•
Granted: 1981-01-27
•
Expires: 1999-07-16
Abstract
Abstract Heat-curable mixtures which are stable on storage and consist of (a) poly-imides of specific unsaturated dicarboxylic acids of the general formula I ##STR1## in which A is a x-valent organic radical having at least 2 and not more than 30 carbon atoms, Z is a radical of the formulae ##STR2## and x is the number 2 or 3, and (b) poly-(β-iminocrotononitriles) of the formula II, III and/or IV ##STR3## in which Y is a m-valent organic radical having at least 2 and at most 30 carbon atoms, R' is a hydrogen atom or an alkyl having 1 to 6 carbon atoms, cycloalkyl having 5 or 6 carbon atoms or aryl having 6 to 10 carbon atoms, R is an aliphatic or aromatic radical having not more than 30 carbon atoms, E, together with the two nitrogen atoms, is a five-membered or six-membered ring, m is 2 or 3 and n is 1 or 2, are suitable for the production of moulded materials, preferably by casting the resin mixture or by laminating or bonding substrates.
Inventors
- 👤 Theobald Haug
- 👤 Jurg Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:48
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
A heat-curable mixture which is stable on storage, which contains (a) at least one polyimide of the formula I ##STR27## in which A is a x-valent organic radical having at least 2 and not more than 30 carbon atoms, Z is a radical of the formulae ##STR28## and x is the number 2 or 3, and (b) at least one poly-(β-iminocrotononitrile) of the formula II, III or IV ##STR29## in which Y is a m-valent organic radical having at least 2 and not more than 30 carbon atoms, R' is a hydrogen atom or an alkyl having 1 to 6 carbon atoms, cycloalkyl having 5 or 6 carbon atoms or aryl having 6 to 10 carbon atoms, R is an aliphatic or aromatic radical having not more than 30 carbon atoms, E, together with the two nitrogen atoms, is a five-membered or six-membered ring, m is 2 or 3 and n is 1 or 2.
Claim 2
Dependent Claim
155 words
A heat-curable mixture which is stable on storage, which contains (a) at least one polyimide of the formula I ##STR27## in which A is a x-valent organic radical having at least 2 and not more than 30 carbon atoms, Z is a radical of the formulae ##STR28## and x is the number 2 or 3, and (b) at least one poly-(β-iminocrotononitrile) of the formula II, III or IV ##STR29## in which Y is a m-valent organic radical having at least 2 and not more than 30 carbon atoms, R' is a hydrogen atom or an alkyl having 1 to 6 carbon atoms, cycloalkyl having 5 or 6 carbon atoms or aryl having 6 to 10 carbon atoms, R is an aliphatic or aromatic radical having not more than 30 carbon atoms, E, together with the two nitrogen atoms, is a five-membered or six-membered ring, m is 2 or 3 and n is 1 or 2.
Claim 3
Dependent Claim
85 words
A mixture according to claim 1, which contains (a) at least one polyimide of formula I, in which A is a radical of the formulae ##STR30## Z is the vinylene radical and x is 2 or 3, and (b) at least one poly-(β-iminocrotononitrile) of the formula II, III or IV, in which Y is a radical of the formulae ##STR31## R' is a hydrogen atom, R is the ethylene radical and n is 1 and the grouping ##STR32## is the radical of the formula ##STR33##
Claim 4
Dependent Claim
27 words
A mixture according to claim 1, which contains (a) at least one polyimide of formula I, and (b) at least one poly-(β-iminocrotononitrile) of formula II or III.
Claim 5
Dependent Claim
24 words
A mixture according to claim 1, wherein 1 to 5 equivalents of maleimide groups are present per 1 equivalent of β-iminocrotononitrile in the mixture.
Claim 6
Dependent Claim
21 words
A mixture according to claim 1, wherein 1.3 to 3 equivalents of maleimide groups are present per 1 equivalent of β-iminocrotononitrile.
Claim 7
Dependent Claim
23 words
A mixture according to claim 1, which contains, as the poly-imide of the formula I, N,N'-hexamethylene-bis-maleimide, N,N'-4,4'-diphenylmethane-bis-maleimide or the N,N',N"-tris-maleimide of tris-(4-aminophenyl) phosphate.
Claim 8
Dependent Claim
22 words
A mixture according to claim 1, which contains, as a poly-(β-iminocrotononitrile) of the formula II, N,N'-4,4'-diphenylmethane-bis-(β-iminocrotononitrile), N,N'-1,3-phenylene-bis-(β-iminocrotononitrile), N,N'-1,4-phenylene-bis-(β-iminocrotononitrile), N,N'-hexamethylene-bis-(β-iminocrotononitrile), N,N'-ethylene-bis-(β-iminocrotononitrile), or N,N'-isophorone-bis-(β-iminocrotononitrile).
Claim 9
Dependent Claim
19 words
A mixture according to claim 1, which contains, as a poly-(β-iminocrotononitrile) of the formula III, the tris-(β-iminocrotononitrile) of diethylenetriamine.
Claim 10
Dependent Claim
32 words
A process for the preparation of an insoluble and infusible plastic product from a curable mixture according to claim 1, which comprises reacting this mixture at temperatures between 50° and 280° C.
Claim 11
Dependent Claim
26 words
A process according to claim 9 wherein the curable mixture is reacted at temperatures between 50° and 280° C. in the presence of a curing catalyst.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |