US4255569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of isocyanurate polyisocyanates, and products by the process
Assignee: Bayer AG
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Filing: 1979-05-04
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Granted: 1981-03-10
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Expires: 1999-05-04
Abstract
Abstract The instant invention is directed to a process for the production of isocyanate polyisocyanates containing at least 50%, by weight, of tris-isocyanatomonoisocyanurates and at most 3%, by weight, of isocyanurate-free diisocyanate. The process comprises catalytically trimerizing the organic diisocyanates free from isocyanurate groups and terminating the trimerization reaction by deactivation of the catalyst after 5 to 40% of the isocyanate groups of the isocyanurate-free diisocyanate have been trimerized. The unreacted isocyanurate-free diisocyanate is then distilled off in the presence of from 1 to 30%, by weight, based on the end product obtained as distillation residue, of an inert liquid distillation aid which boils at a temperature at least 50 DEG C. above the boiling point of the isocyanurate-free diisocyanate. The invention is also directed to the products produced by this process.
Inventors
- 👤 Hans-Jurgen Muller
- 👤 Rudolf Hombach
- 👤 Manfred Dollhausen
- 👤 Joachim Zirner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:52
CPC Classifications
C; C09; C09J; C09J121/00; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08K; C08K5/00; C08K5/16; C08K5/29; C09J175/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
A process for the production of polyisocyanates of isocyanurate structure containing at least 50%, by weight, of tris-isocyanatomonoisocyanurates and at most 3%, by weight, of diisocyanate free from isocyanurate groups comprising: (a) catalytically trimerizing organic diisocyanates free from isocyanurate groups, selected from the group consisting of 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane and mixtures thereof, (b) terminating the trimerization reaction by deactivation of the catalyst after from 5 to 40% of the isocyanate groups of the isocyanurate-free diisocyanate have been trimerized, and (c) removing the unreacted isocyanurate-free diisocyanate present in the reaction mixture from the reaction mixture by distillation, said distillation being carried out in the presence of from 1, to 30%, by weight, based on the end product obtained as distillation residue, of a liquid distillation aid which is inert under the distillation conditions and which boils at a temperature at least 50° C. above the boiling point of the isocyanurate-free diisocyanate.
Claim 2
Dependent Claim
152 words
A process for the production of polyisocyanates of isocyanurate structure containing at least 50%, by weight, of tris-isocyanatomonoisocyanurates and at most 3%, by weight, of diisocyanate free from isocyanurate groups comprising: (a) catalytically trimerizing organic diisocyanates free from isocyanurate groups, selected from the group consisting of 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane and mixtures thereof, (b) terminating the trimerization reaction by deactivation of the catalyst after from 5 to 40% of the isocyanate groups of the isocyanurate-free diisocyanate have been trimerized, and (c) removing the unreacted isocyanurate-free diisocyanate present in the reaction mixture from the reaction mixture by distillation, said distillation being carried out in the presence of from 1, to 30%, by weight, based on the end product obtained as distillation residue, of a liquid distillation aid which is inert under the distillation conditions and which boils at a temperature at least 50° C. above the boiling point of the isocyanurate-free diisocyanate.
Claim 3
Dependent Claim
44 words
Polyisocyanates of isocyanurate structure obtained by the partial trimerization of the isocyanate groups of 2,4- and optionally, 2,6,-diisocyanatotoluene, characterized by a content of at least 50%, by weight, of tris-(isocyanatotolyl)-isocyanurate and a content of less than 3%, by weight, of free 2,4- and/or 2,6-diisocyanatotoluene.
Claim 4
Dependent Claim
44 words
Polyisocyanates of isocyanurate structure obtained by the partial trimerization of the isocyanate groups of 2,4- and optionally, 2,6,-diisocyanatotoluene, characterized by a content of at least 50%, by weight, of tris-(isocyanatotolyl)-isocyanurate and a content of less than 3%, by weight, of free 2,4- and/or 2,6-diisocyanatotoluene.
Claim 5
Dependent Claim
41 words
Polyisocyanates of isocyanurate structure obtained by the partial trimerization of the isocyanate groups of 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane, characterized by a content of at least 50%, by weight, of tris-[(1,3,3-trimethyl-5-isocyanatocyclohexyl)-methyl]-isocyanurate and a content of less than 3%, by weight, of free 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane.
Claim 6
Dependent Claim
41 words
Polyisocyanates of isocyanurate structure obtained by the partial trimerization of the isocyanate groups of 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane, characterized by a content of at least 50%, by weight, of tris-[(1,3,3-trimethyl-5-isocyanatocyclohexyl)-methyl]-isocyanurate and a content of less than 3%, by weight, of free 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |