Patent US4220741A successfully refreshed from Google Patents.
US4220741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable mixtures based on maleimide prepolymers and acetone-anil
Assignee: BASF Corp
•
Filing: 1979-03-30
•
Granted: 1980-09-02
•
Expires: 1999-03-30
Abstract
Abstract Mixtures which can be cured to give moulded materials having technically very valuable mechanical and dielectric properties, characterized in that they contain (a) mono-, bis- or tris-maleimides and/or maleimide pre-polymers of the maleimides with an aliphatic, cycloaliphatic or aromatic diprimary diamine, (b) acetone-anil, and optionally (c) a copolymerizable compound containing at least one olefinic C═C double bond in the molecule.
Inventors
- 👤 Alfred Renner
- 👤 Sheik A. Zahir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:54
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; C08L79/085; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A curable composition which consists essentially of (a) a maleimide prepolymer obtained by the reaction of a maleimide of formula I ##STR6## wherein R denotes an n-valent aliphatic or aromatic radical and n denotes the number 2, with an aliphatic, cycloaliphatic or aromatic primary diamine containing 2 to 40 carbon atoms, whereby to 1 imido group equivalent is used 0.05 to 1 amino group equivalent; and (b) 2,2,4-trimethyl-1,2-dihydroquinoline, in such ratio that for 1 imido group equivalent is used 0.05 to 1 mole of 2,2,4-trimethyl-1,2-dihydroquinoline.
Claim 2
Dependent Claim
85 words
A curable composition which consists essentially of (a) a maleimide prepolymer obtained by the reaction of a maleimide of formula I ##STR6## wherein R denotes an n-valent aliphatic or aromatic radical and n denotes the number 2, with an aliphatic, cycloaliphatic or aromatic primary diamine containing 2 to 40 carbon atoms, whereby to 1 imido group equivalent is used 0.05 to 1 amino group equivalent; and (b) 2,2,4-trimethyl-1,2-dihydroquinoline, in such ratio that for 1 imido group equivalent is used 0.05 to 1 mole of 2,2,4-trimethyl-1,2-dihydroquinoline.
Claim 3
Dependent Claim
20 words
A composition according to claim 1 wherein the maleimide of formula I is ##STR7## and the aromatic diamine is 4,4'-diaminodiphenylmethane.
Claim 4
Dependent Claim
19 words
A composition according to claim 1 wherein R represents a bivalent aromatic radical, and n represents the number 2.
Claim 5
Dependent Claim
37 words
A composition according to claim 1 wherein R represents an unsubstituted phenylene radical or a phenylene radical substituted by methyl, or a radical of the formula ##STR8## wherein A represents methylene, an ether oxygen atom or sulphonyl.
Claim 6
Dependent Claim
63 words
A composition according to claim 1 wherein a maleimide pre-polymer is obtained by reaction of a maleimide of the formula I wherein R represents a bivalent aromatic radical, and n represents the number 2, with an aromatic primary diamine containing 6-15 C atoms in the molecule, whereby to 1 imido group equivalent there is used 0.1 to 0.6 of an amino group equivalent.
Claim 7
Dependent Claim
32 words
A composition according to claim 1 wherein the components (a) and (b) are in such a ratio that to 1 imido group equivalent there is present 0.1 to 0.5 mole of 2,2,4-trimethyl-1,2-dihydroquinoline.
References Cited (Backward Citations)
US4066621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |