US4935486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of modified polyisocyanates, the polyisocyanates obtainable by this process and their use as binders or as a binder component
Assignee: Bayer AG
•
Filing: 1989-04-26
•
Granted: 1990-06-19
•
Expires: 2009-04-26
Abstract
Abstract The present invention is directed to a process for the production of urethane- or isocyanurate-modified polyisocyanates based on a starting diisocyanate selected from (i) 2,4-diisocyanatotoluene or mixtures thereof with up to about 35%, based on the mixture, of 2,6-diisocyanatotoluene, (ii) mixtures of the diisocyanates mentioned under (i) with up to 80 NCO equivalent %, based on the mixture, of 1,6-diisocyanatohexane and (iii) 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane by reacting the starting diisocyanate with substoichiometric quantities of polyhydric alcohols or trimerizing a portion of the isocyanate groups of the starting diisocyanate, removing sufficient excess, unreacted starting diisocyanate to obtain modified polyisocyanates containing at most 3% by weight, based on solids, of monomeric starting diisocyanate, characterized in that, the content of starting diisocyanate is further reduced by adding at least 10 mol-% water, based on the content of unreacted 2,4-diisocyanatotoluene or 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane present, to the modified polyisocyanates. The present invention is also directed to the low-monomer polyisocyanates obtained by this process and their use as the binder component in one-component or two-component polyurethane lacquers.
Inventors
- 👤 Wolfgang Wellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8045; C08G18/08; C08G18/10; C08G18/77; C08G18/78; C08G18/79; C08G18/791
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A process for the production of a urethane- or isocyanurate-modified polyisocyanate based on a starting diisocyanate comprising a member selected from the group consisting of (i) 2,4-diisocyanatotolune or mixtures thereof with up to about 35%, based on the mixture, of 2,6-diisocyanatotoluene, (ii) mixtures of (i) with up to about 80 NCO equivalent % based on the mixture of 1,6-diisocyanatohexane and (iii) 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane which comprises (a) reacting said starting diisocyanate with a substoichiometric quantity of a polyhydric alcohol or trimerizing a portion of the isocyanate groups of said starting diisocyanate, (b) removing sufficient excess, unreacted starting diisocyanate to obtain a modified polyisocyanate containing at most 3% by weight, based on solids, of said starting diisocyanate and (c) further reducing the content of starting diisocyanate by adding at least 10 mole-% of water, based on the content of unreacted 2,4-diisocyanatotoluene or 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane, to the modified polyisocyanate.
Claim 2
Dependent Claim
145 words
A process for the production of a urethane- or isocyanurate-modified polyisocyanate based on a starting diisocyanate comprising a member selected from the group consisting of (i) 2,4-diisocyanatotolune or mixtures thereof with up to about 35%, based on the mixture, of 2,6-diisocyanatotoluene, (ii) mixtures of (i) with up to about 80 NCO equivalent % based on the mixture of 1,6-diisocyanatohexane and (iii) 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane which comprises (a) reacting said starting diisocyanate with a substoichiometric quantity of a polyhydric alcohol or trimerizing a portion of the isocyanate groups of said starting diisocyanate, (b) removing sufficient excess, unreacted starting diisocyanate to obtain a modified polyisocyanate containing at most 3% by weight, based on solids, of said starting diisocyanate and (c) further reducing the content of starting diisocyanate by adding at least 10 mole-% of water, based on the content of unreacted 2,4-diisocyanatotoluene or 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane, to the modified polyisocyanate.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said starting diisocyanate is 2,4-diisocyanatotoluene.
Claim 4
Dependent Claim
144 words
A urethane- or isocyanurate-modified polyisocyanate based on a starting diisocyanate comprising a member selected from the group consisting of (i) 2,4-diisocyanatotolune or mixtures thereof with up to about 35%, based on the mixture, of 2,6-diisocyanatotoluene, (ii) mixtures of (i) with up to about 80 NCO equivalent % based on the mixture of 1,6-diisocyanatohexane and (iii) 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane which is prepared by a process comprising (a) reacting said starting diisocyanate with a substoichiometric quantity of a polyhydric alcohol or trimerizing a portion of the isocyanate groups of said starting diisocyanate, (b) removing sufficient excess, unreacted starting diisocyanate to obtain a modified polyisocyanate containing at most 3% by weight, based on solids, of said starting diisocyanate and (c) further reducing the content of starting diisocyanates by adding at least 10 mole-% of water, based on the content of unreacted 2,4-diisocyanatotoluene or 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane, to the modified polyisocyanate.
Claim 5
Dependent Claim
144 words
A urethane- or isocyanurate-modified polyisocyanate based on a starting diisocyanate comprising a member selected from the group consisting of (i) 2,4-diisocyanatotolune or mixtures thereof with up to about 35%, based on the mixture, of 2,6-diisocyanatotoluene, (ii) mixtures of (i) with up to about 80 NCO equivalent % based on the mixture of 1,6-diisocyanatohexane and (iii) 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane which is prepared by a process comprising (a) reacting said starting diisocyanate with a substoichiometric quantity of a polyhydric alcohol or trimerizing a portion of the isocyanate groups of said starting diisocyanate, (b) removing sufficient excess, unreacted starting diisocyanate to obtain a modified polyisocyanate containing at most 3% by weight, based on solids, of said starting diisocyanate and (c) further reducing the content of starting diisocyanates by adding at least 10 mole-% of water, based on the content of unreacted 2,4-diisocyanatotoluene or 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane, to the modified polyisocyanate.
Claim 6
Dependent Claim
11 words
The polyisocyanate of claim 3 wherein said starting diisocyanate is 2,4-diisocyanatotoluene.
Claim 7
Dependent Claim
21 words
A two-component polyurethane lacquer which comprises the modified polyisocyanate of claim 3 and a compound containing at least two hydroxyl groups.
References Cited (Backward Citations)
US3183112A
Cited
US3023228A
Cited
US3394111A
Cited
US3428611A
Cited
GB1244416A
Cited
US3992316A
Cited
GB1458564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |