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US5064960A
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Solutions of isocyanurate polyisocyanates in coatings solvents and a process for their production
Assignee: Bayer AG
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Filing: 1990-08-22
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Granted: 1991-11-12
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Expires: 2010-08-22
Abstract
Abstract The present invention relates to a process for the preparation of a composition containing an isocyanurate polyisocyanate dissolved in a solvent inert to isocyanate groups by a) reacting 2.5 to 7% of the isocyanate groups of a starting diisocyanate based on 2,4-diisocyanatotoluene or a mixture of 2,4-diisocyanatotoluene and 2,6-diisocyanatotoluene with a monohydric alcohol corresponding to the formula ##STR1## wherein R 1 is an aliphatic or cycloaliphatic C 6-18 hydrocarbon radical which may be olefinically unsaturated, R 2 is hydrogen or a methyl group, and n is 0 or an integer from 1 to 3, b) adding a sufficient amount of an organic solvent which is inert to isocyanate groups to form a 30 to 70% solution of the urethanized diisocyanate either before, during or after step a), c) subsequently partially trimerizing the remaining isocyanate groups of said urethanized diisocyanate in the presence of a catalyst which accelerates the trimerization of isocyanate groups and d) terminating the trimerization reaction when the content of unreacted diisocyanotoluene is less than 0.5% by weight by the addition of a catalyst poison. The present invention also relates to the solutions of isocyanurate polyisocyanates obtained by this process.
Inventors
- 👤 Josef Pedain
- 👤 Dieter Margotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/794; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/34; C08G18/80; C08G18/8061; C08G18/8064
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
174 words
A process for the preparation of a composition containing an isocyanurate polyisocyanate dissolved in a solvent inert to isocyanate groups which comprises a) reacting 2.5 to 7% of the isocyanate groups of a starting diisocyanate consisting essentially of 2,4-diisocyanatotoluene or a mixture of 2,4-diisocyanatotoluene and 2,6-diisocyanatotoluene with a monohydric alcohol corresponding to the formala ##STR5## wherein R 1 is an aliphatic or cycloaliphatic C 6-18 hydrocarbon radical which may be olefinically unsaturated, R 2 is hydrogen or a methyl group, and n is 0 or an integer from 1 to 3, b) adding a sufficient amount of an organic solvent which is inert to isocyanate groups to form a 30 to 70% solution of the urethanized diisocyanate either before, during or after step a), c) subsequently partially trimerizing the remaining isocyanate groups of said urethanized diisocyanate in the presence of a catalyst which accelerates the trimerization of isocyanate groups and d) terminating the trimerization reaction when the content of unreacted diisocyananotoluene is less than 0.5% by weight by the addition of a catalyst poison.
Claim 2
Dependent Claim
174 words
A process for the preparation of a composition containing an isocyanurate polyisocyanate dissolved in a solvent inert to isocyanate groups which comprises a) reacting 2.5 to 7% of the isocyanate groups of a starting diisocyanate consisting essentially of 2,4-diisocyanatotoluene or a mixture of 2,4-diisocyanatotoluene and 2,6-diisocyanatotoluene with a monohydric alcohol corresponding to the formala ##STR5## wherein R 1 is an aliphatic or cycloaliphatic C 6-18 hydrocarbon radical which may be olefinically unsaturated, R 2 is hydrogen or a methyl group, and n is 0 or an integer from 1 to 3, b) adding a sufficient amount of an organic solvent which is inert to isocyanate groups to form a 30 to 70% solution of the urethanized diisocyanate either before, during or after step a), c) subsequently partially trimerizing the remaining isocyanate groups of said urethanized diisocyanate in the presence of a catalyst which accelerates the trimerization of isocyanate groups and d) terminating the trimerization reaction when the content of unreacted diisocyananotoluene is less than 0.5% by weight by the addition of a catalyst poison.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein said monoalcohol comprises an alkanol which is free from ether groups, contains primary hydroxyl groups and has 8 to 12 carbon atoms in the alkyl radical.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said monoalcohol comprises 2-ethyl hexanol.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said starting diisocyanate consists essentially of a mixture of 2,4-diisocyanatotoluene with 2,6-diisocyanatotoluene in a weight ratio 2 to 9:1.
Claim 6
Dependent Claim
25 words
The process of claim 2 wherein said starting diisocyanate consists essentially of a mixture of 2,4-diisocyanatotoluene with 2,6-diisocyanatotoluene in a weight ratio 3:2 to 9:1.
Claim 7
Dependent Claim
25 words
The process of claim 3 wherein said starting diisocyanate consists essentially of a mixture of 2,4-diisocyanatotoluene with 2,6-diisocyanatotoluene in a weight ratio 3:2 to 9:1.
Claim 8
Dependent Claim
174 words
A composition containing an isocyanurate polyisocyanate dissolved in a solvent inert to isocyanate groups which is prepared by a process which comprises a) reacting 2.5 to 7% of the isocyanate groups of a starting diisocyanate consisting essentially of 2,4-diisocyanatotoluene or a mixture of 2,4-diisocyanatotoluene and 2,6-diisocyanatotoluene with a monohydric alcohol corresponding to the formala ##STR6## wherein R 1 is an aliphatic or cycloaliphati C 6-18 hydrocarbon radical which may be olefinically unsaturated, R 2 is hydrogen or a methyl group, and n is 0 or an integer from 1 to 3, b) adding a sufficient amount of an organic solvent which is inert to isocyanate groups to form a 30 to 70% solution of the urethanized diisocyanate either before, during or after step a), c) subsequently partially trimerizing the remaining isocyanate groups of said urethanized diisocyanate in the presence of a catalyst which accelerates the trimerization of isocyanate groups and d) terminating the trimerization reaction when the content of unreacted diisocyananotoluene is less than 0.5% by weight by the addition of a catalyst poison.
Claim 9
Dependent Claim
174 words
A composition containing an isocyanurate polyisocyanate dissolved in a solvent inert to isocyanate groups which is prepared by a process which comprises a) reacting 2.5 to 7% of the isocyanate groups of a starting diisocyanate consisting essentially of 2,4-diisocyanatotoluene or a mixture of 2,4-diisocyanatotoluene and 2,6-diisocyanatotoluene with a monohydric alcohol corresponding to the formala ##STR6## wherein R 1 is an aliphatic or cycloaliphati C 6-18 hydrocarbon radical which may be olefinically unsaturated, R 2 is hydrogen or a methyl group, and n is 0 or an integer from 1 to 3, b) adding a sufficient amount of an organic solvent which is inert to isocyanate groups to form a 30 to 70% solution of the urethanized diisocyanate either before, during or after step a), c) subsequently partially trimerizing the remaining isocyanate groups of said urethanized diisocyanate in the presence of a catalyst which accelerates the trimerization of isocyanate groups and d) terminating the trimerization reaction when the content of unreacted diisocyananotoluene is less than 0.5% by weight by the addition of a catalyst poison.
Claim 10
Dependent Claim
32 words
The composition of claim 7 wherein said mono-alcohol comprises an alkanol which is free from ether groups, contains primary hydroxyl groups and has 8 to 12 carbon atoms in the alkyl radical.
Claim 11
Dependent Claim
11 words
The composition of claim 7 wherein said monoalcohol comprises 2-ethyl hexanol.
Claim 12
Dependent Claim
25 words
The composition of claim 7 wherein said starting diisocyanate consists essentially of a mixture of 2,4-diisocyanatotoluene with 2,6-diisocyanatotoluene in a weight ratio 2 to 9:1.
Claim 13
Dependent Claim
25 words
The composition of claim 8 wherein said starting diisocyanate consists essentially of a mixture of 2,4-diisocyanatotoluene with 2,6-diisocyanatotoluene in a weight ratio 2 to 9:1.
Claim 14
Dependent Claim
25 words
The composition of claim 9 wherein said starting diisocyanate consists essentially of a mixture of 2,4-diisocyanatotoluene with 2,6-diisocyanatotoluene in a weight ratio 2 to 9:1.
References Cited (Backward Citations)
US3996223A
Cited
EP1458564A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |