US4618706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of aromatic polyisocyanates containing urea and/or biuret groups
Assignee: Bayer AG
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Filing: 1982-04-02
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Granted: 1986-10-21
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Expires: 2002-04-02
Abstract
Abstract This invention relates to a process for the preparation of aromatic polyisocyanates containing urea and/or biuret groups, optionally in the form of a mixture of homologues and/or isomers, by the reaction of aromatic diisocyanates with diamines having primary or secondary amino groups at about 20° to 180° C., and at an equivalent ratio of isocyanate groups to amino groups in the range of 5:1 to 100:1, at least 25 mol percent of the diisocyanates put into the process and/or at least 25 mol percent of the diamines put into the process being alkyl-phenylene diisocyanates or, respectively, alkyl-phenylene diamines, in which the alkyl substituents have 6 to 18 carbon atoms, and the use of the products of the process, optionally as solutions in excess starting diisocyanate, as isocyanate components in the production of polyurethanes.
Inventors
- 👤 Hans-Joachim Scholl
- 👤 Hans Hettel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:33
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36; C07C273/00; C07C273/18; C07C273/1809; C07C273/1818; C07C273/1827; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8038
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A process for the preparation of aromatic polyisocyanates containing urea and/or biuret groups, optionally in the form of a mixture of homologues and/or isomers, which comprises reacting diisocyanates which are free from urea and biuret groups selected from the group consisting of aromatic diisocyanates with diamines having primary or secondary amino groups and which are free from urea and biuret groups at about 20° to 180° C., and at an equivalent ratio of isocyanate groups to amino groups in the range of about 5:1 to 100:1 without precipitating any insoluble urea and/or biuret constituents, wherein at least about 25 mol % of the diisocyanates put into the process correspond to the formula: ##STR8## and/or at least about 25 mol % of the diamines put into the process correspond to the formula: ##STR9## wherein R 1 represents a saturated aliphatic hydrocarbon having 6 to 18 carbon atoms and R 2 represents a saturated aliphatic hydrocarbon having 10 to 13 carbon atoms.
Claim 2
Dependent Claim
160 words
A process for the preparation of aromatic polyisocyanates containing urea and/or biuret groups, optionally in the form of a mixture of homologues and/or isomers, which comprises reacting diisocyanates which are free from urea and biuret groups selected from the group consisting of aromatic diisocyanates with diamines having primary or secondary amino groups and which are free from urea and biuret groups at about 20° to 180° C., and at an equivalent ratio of isocyanate groups to amino groups in the range of about 5:1 to 100:1 without precipitating any insoluble urea and/or biuret constituents, wherein at least about 25 mol % of the diisocyanates put into the process correspond to the formula: ##STR8## and/or at least about 25 mol % of the diamines put into the process correspond to the formula: ##STR9## wherein R 1 represents a saturated aliphatic hydrocarbon having 6 to 18 carbon atoms and R 2 represents a saturated aliphatic hydrocarbon having 10 to 13 carbon atoms.
Claim 3
Dependent Claim
30 words
The process of claim 1 which comprises removing at least a portion of the excess unmodified aromatic diisocyanates which are free from urea and biuret groups by thin layer distillation.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein about 100 mol % of the diamines put into the process correspond to the formula set forth in claim 1.
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein said process is conducted in the absence of an auxiliary solvent other than the excess aromatic diisocyanate employed during the reaction.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |