US4628079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide imides produced from either lactams or polyamides with isocyanates or anhydrides in which products are precipitated with a non-solvent
Assignee: Bayer AG
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Filing: 1985-06-20
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Granted: 1986-12-09
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Expires: 2005-06-20
Abstract
Abstract This invention relates to the use of polyamide imides as thermoplasts.
Inventors
- 👤 Wilfried Zecher
- 👤 Rolf Dhein
- 👤 Klaus Reinking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/60; C08G18/603; C08G18/2805; C08G18/285; C08G18/2855; C08G18/30; C08G18/34; C08G18/343; C08G73/00; C08G73/06; C08G73/10; C08G73/14; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
A thermoplastic material which comprises polyamide imides produced in a solvent from polyisocyanates, polycarboxylic acid anhydrides and lactams or polyamides, precipitated with a non-solvent and then granulated.
Claim 2
Dependent Claim
27 words
A thermoplastic material which comprises polyamide imides produced in a solvent from polyisocyanates, polycarboxylic acid anhydrides and lactams or polyamides, precipitated with a non-solvent and then granulated.
Claim 3
Dependent Claim
36 words
A thermoplastic material according to claim 1 wherein the polyamide imides are produced in a solvent and are then concentrated in an evaporation extruder at a temperature of from 250° to 400° C. and condensed out.
Claim 4
Dependent Claim
18 words
A thermoplastic material according to claim 1 wherein trimellitic acid anhydride is used as the polycarboxylic acid anhydride.
Claim 5
Dependent Claim
36 words
A thermoplastic material according to claim 1 wherein mixtures of from 40 to 95%, by weight, of an aromatic diisocyanate and from 5 to 60%, by weight, of an aliphatic diisocyanate are used as the polyisocyanates.
Claim 6
Dependent Claim
40 words
A thermoplastic material according to claim 1 wherein during the production of the polymer in a phenolic solvent after the polymerization the reaction mixture is kept for additional 0.5 to 10 hours at a temperature of 200° to 250° C.
Claim 7
Dependent Claim
30 words
A thermoplastic material which comprises polymide imides produced in a solvent from polyisocyanates, polycarboxylic acid anhydrides and lactams or polyamides, extracting the polyamide imide and then granulating the polyamide imide.
Claim 8
Dependent Claim
30 words
A thermoplastic material which comprises polymide imides produced in a solvent from polyisocyanates, polycarboxylic acid anhydrides and lactams or polyamides, extracting the polyamide imide and then granulating the polyamide imide.
Claim 9
Dependent Claim
38 words
A thermoplastic material according to claim 6 characterised in that the polyamide imides are produced in a solvent and are then concentrated in an evaporation extruder at a temperature of from 250° to 400° C. and condensed out.
Claim 10
Dependent Claim
18 words
A thermoplastic material according to claim 6 wherein trimellitic acid anhydride is used as the polycarboxylic acid anhydride.
Claim 11
Dependent Claim
36 words
A thermoplastic material according to claim 6 wherein mixtures of from 40 to 95%, by weight, of an aromatic diisocyanate and from 5 to 60%, by weight, of an aliphatic diisocyanate are used as the polyisocyanates.
Claim 12
Dependent Claim
41 words
A thermoplastic material according to claim 6 wherein during the production of the polymer in a phenolic solvent after the polymerization in the reaction mixture is kept for additional 0.5 to 10 hours at a temperature of 200° to 250° C.
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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |