US3625912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide lacquers
Assignee: DeSoto Inc
•
Filing: 1968-07-26
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Granted: 1971-12-07
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Expires: 1988-07-26
Abstract
Abstract A bis-maleimide is reacted with a diprimary amine in organic solvent medium at a temperature of about 150* C. and present in molar proportions of about 1:1 to produce organic solvent-soluble polymers which thermoset on baking.
Inventors
- 👤 Gerald G Vincent
- 👤 Thomas E Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:49
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
23 words
A polymer as recited in clAim 1 in which the ratio of said bis-maleimide to said diprimary amine is from 1.5:1 to 1:1.5.
Claim 2
Dependent Claim
16 words
A polymer as recited in claim 1 in which said maleimide is based on maleic anhydride.
Claim 3
Dependent Claim
14 words
A polymer as recited in claim 1 in which said diprimary amine is aromatic.
Claim 4
Dependent Claim
17 words
A polymer as recited in claim 1 in which the temperature of reaction is about 150* C.
Claim 5
Dependent Claim
45 words
A polymer as recited in claim 1 in which said bis-maleimide is formed by reaction of 2 moles of diprimary aromatic amine with 1 mole of maleic anhydride and additional diprimary aromatic amine is reacted with said bis-maleimide in a molar proportion of substantially 1:1.
Claim 6
Dependent Claim
15 words
A lacquer comprising the polymer of claim 1 in solution in a polar organic solvent.
Claim 7
Dependent Claim
24 words
A lacquer as recited in claim 7 in which said solvent is selected from the group of dimethyl formamide, dimethylacetamide, N-methyl pyrollidone and butyrolactone.
Claim 8
Dependent Claim
18 words
A lacquer as recited in claim 7 in which said solvent is used in admixture with cyclohexanone diluent.
Claim 9
Independent Claim
49 words
A method of forming a resinous polymer soluble in polar organic solvent and containing amine and imide groups comprising reacting a bis-maleimide with a diprimary amine in a molar ratio of from 5:1 to 1:5 in polar organic solvent medium at a temperature of at least about 130* C.
Claim 10
Dependent Claim
19 words
A coated product comprising a metal substrate coated with a baked film of the lacquer recited in claim 7.
Claim 11
Dependent Claim
37 words
A method of providing a solvent insoluble coating on a metal substrate comprising applying thereto a film of the lacquer recited in claim 7 and then baking said film at a temperature of at least 250* F.
References Cited (Backward Citations)
US3406148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |