US4177342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyisocyanates containing allophanate groups
Assignee: Bayer AG
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Filing: 1978-05-24
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Granted: 1979-12-04
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Expires: 1998-05-24
Abstract
Abstract This invention relates to a new process for the preparation of new organic polyisocyanates having at least three isocyanate groups and containing allophanate groups, to the polyisocyanates obtainable by this process, and to their use as components for the production of polyurethane resins.
Inventors
- 👤 Manfred Bock
- 👤 Josef Pedain
- 👤 Wilhelm Slawyk
- 👤 Klaus Konig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8054; C08G18/8058; C07; C07C; C07C273/00; C07C273/18; C07C273/1809; C07C273/1836; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7837
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
A process for the preparation of allophanate polyisocyanates having at least three isocyanate groups by the reaction of hydroxyl compounds with excess quantities of organic polyisocyanates which are free from allophanate groups, characterized in that the hydroxyl compounds used contain compounds represented by the following formula ##STR4## wherein R 1 and R 2 are identical or different and represent hydrogen or hydroxyalkyl, alkyl or cycloalkyl groups wherein at least one of the groups R 1 and R 2 must be hydrogen or a hydroxy alkyl group, and R 3 , R 4 , R 5 and R 6 are identical or different and represent hydrogen or alkyl or hydroxy alkyl groups or the groups R 3 and R 5 together with the two carbon atoms may form the basic structure of a cycloaliphatic ring.
Claim 2
Dependent Claim
134 words
A process for the preparation of allophanate polyisocyanates having at least three isocyanate groups by the reaction of hydroxyl compounds with excess quantities of organic polyisocyanates which are free from allophanate groups, characterized in that the hydroxyl compounds used contain compounds represented by the following formula ##STR4## wherein R 1 and R 2 are identical or different and represent hydrogen or hydroxyalkyl, alkyl or cycloalkyl groups wherein at least one of the groups R 1 and R 2 must be hydrogen or a hydroxy alkyl group, and R 3 , R 4 , R 5 and R 6 are identical or different and represent hydrogen or alkyl or hydroxy alkyl groups or the groups R 3 and R 5 together with the two carbon atoms may form the basic structure of a cycloaliphatic ring.
Claim 3
Dependent Claim
150 words
The process of claim 1 wherein R 1 and R 2 are the same or different and represent hydrogen, C 2 to C 18 hydroxy alkyl groups, C 1 to C 18 alkyl groups or C 4 to C 15 cycloalkyl groups, at least one of the groups R 1 or R 2 representing hydrogen or a C 2 to C 18 hydroxy alkyl group, and R 3 , R 4 , R 5 and R 6 , are the same or different and represent hydrogen, C 1 to C 18 alkyl groups, C 1 to C 18 hydroxy alkyl groups or the groups R 3 and R 5 together with the two attached carbon atoms form the basic structure of a cycloaliphatic ring having 5 to 6 carbon atoms, and at least two of the groups R 3 , R 4 , R 5 and R 6 represent hydrogen.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the NCO/OH equivalent ratio of organic polyisocyanates to hydroxyl compounds is at least about 4:1.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein NCO/OH equivalent ratio is from about 6:1 to 25:1.
Claim 6
Dependent Claim
10 words
Allophanate group-containing polyisocyanates produced by the process of claim 1.
Claim 7
Dependent Claim
30 words
In a process for the production of polyurethane resins by the isocyanate polyaddition process, the improvement comprising reacting polyhydroxy compounds with the allophanate-polyisocyanates produced by the process of claim 1.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the allophanatepolyisocyanates are present in blocked form.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the allophanate polyisocyanates are prepared in the absence of catalysts.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein a constant isocyanate content is established after heating the hydroxyl compounds and the organic polyisocyanate for from 20 minutes to 4 hours.
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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) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |