US4546162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamidoimides prepared from trimelitic acid anhydride, isocyanates and either lactams or polyamides using a mixture of diisocyanatodiphenylmethane and tolylene diisocyanates
Assignee: Bayer AG
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Filing: 1984-08-27
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Granted: 1985-10-08
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Expires: 2004-08-27
Abstract
Abstract This invention relates to certain new aliphatic-aromatic polyamidoimides suitable for use as non-clouding electroinsulating lacquers and duroplasts.
Inventors
- 👤 Wilfried Zecher
- 👤 Willi Dunwald
- 👤 Rudolf Merten
- 👤 Klaus Reinking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:44
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/285; C08G18/2855; C08G18/30; C08G18/34; C08G18/343; C08G18/345; C08G18/40; C08G18/60; C08G18/603; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7607; C08G73/00; C08G73/06; C08G73/10; C08G73/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31551; Y10T428/31605
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
Polyamidoimides prepared by the reaction of (i) trimellitic acid anhydride, (ii) a lactam of the formula ##STR3## wherein n is an integer of from 2 to 20, a polyamide of the formula --[(CH.sub.2).sub.n --CONH]-- wherein n is an integer of from 2 to 20 or a polyamide of the formula --[CO--(CH.sub.2).sub.x --CONH--(CH.sub.2).sub.y --NH] wherein x is an integer of from 0 to 18 and y is an integer of from 2 to 18, and (iii) isocyanates which are mixtures of from 98 to 40%, by weight, of 4,4'-diisocyanatodiphenylmethane and from 2 to 60%, by weight, of tolylene diisocyanates.
Claim 2
Dependent Claim
98 words
Polyamidoimides prepared by the reaction of (i) trimellitic acid anhydride, (ii) a lactam of the formula ##STR3## wherein n is an integer of from 2 to 20, a polyamide of the formula --[(CH.sub.2).sub.n --CONH]-- wherein n is an integer of from 2 to 20 or a polyamide of the formula --[CO--(CH.sub.2).sub.x --CONH--(CH.sub.2).sub.y --NH] wherein x is an integer of from 0 to 18 and y is an integer of from 2 to 18, and (iii) isocyanates which are mixtures of from 98 to 40%, by weight, of 4,4'-diisocyanatodiphenylmethane and from 2 to 60%, by weight, of tolylene diisocyanates.
Claim 3
Dependent Claim
9 words
Polyamidoimides according to claim 1 wherein (ii) is caprolactam.
Claim 4
Dependent Claim
22 words
Polyamidoimides according to claim 1 wherein (ii) is a polyamide comprising recurrent structural units of one or more of the formulae ##STR4##
Claim 5
Dependent Claim
15 words
Polyamidoimides according to claim 1 wherein (iii) is polycapronamide, hexamethylene adipamide or a mixture thereof.
Claim 6
Dependent Claim
21 words
Polyamidoimides according to claim 1 wherein (iii) is 20 to 60% of 2,4- and 2,6-tolylene diisocyanates in a ratio of 4:1.
Claim 7
Dependent Claim
19 words
Polyamidoimides according to claim 1 wherein (iii) has up to 40% of the 4,4'-diisocyanatodiphenyl methane replaced with polyphenyl-polymethylene polyisocyanates.
Claim 8
Dependent Claim
22 words
Polyamidoimides according to claim 1 wherein (iii) comprises up to 30% of the mixture being in the form of the corresponding isocyanurate.
Claim 9
Dependent Claim
36 words
Process for the preparation of polyamidoimides according to claim 1 wherein the reaction components are reacted at a temperature of from 0° to 400° C., with or without a solvent and with or without a catalyst.
Claim 10
Dependent Claim
11 words
Coating or duroplast compositions containing a polyamidoimide according to claim 1.
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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |