Patent US4680367A successfully refreshed from Google Patents.
US4680367A
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Process for the production of urea group-containing polyisocyanates
Assignee: Bayer AG
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Filing: 1985-10-03
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Granted: 1987-07-14
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Expires: 2005-10-03
Abstract
Abstract The present invention is directed to a process for the production of urea group-containing, finely divided solid polyisocyanates by emulsifying or suspending a urea group-free organic polyisoycanate in an excess of water so that said organic polyisocyanate amounts to about 1 to 65% by weight of the reaction mixture, said water containing about 0.01 to 5% by weight, based on the aqueous phase, of a protective colloid and reacting the organic polyisocyanate with water to yeild a urea group-containing polyisocyanate.
Inventors
- 👤 Richard Kopp
- 👤 Gerhard Grogler
- 👤 Heinrich Hess
- 👤 Klaus Konig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:56
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/703; C07; C07C; C07C273/00; C07C273/18; C07C273/1809; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7825; C08G18/80; C08G18/8003; C08G18/8045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A process for the productin of urea group-containing, finely divided solid polyisocyanates which comprises emulsifying or suspending a urea group-free organic polyisocyanate in an excess of water so that said organic polyisocyanate amounts to about 1 to 65% by weight of the reaction mixture, said water containing about 0.01 to 5% by weight, based on the aqueous phase, of a protective colloid, reacting the organic polyisocyanate with water to yield a urea group-containing polyisocyanate and separting and recovering said urea group-containing, finely divided solid polyisocyanates.
Claim 2
Dependent Claim
85 words
A process for the productin of urea group-containing, finely divided solid polyisocyanates which comprises emulsifying or suspending a urea group-free organic polyisocyanate in an excess of water so that said organic polyisocyanate amounts to about 1 to 65% by weight of the reaction mixture, said water containing about 0.01 to 5% by weight, based on the aqueous phase, of a protective colloid, reacting the organic polyisocyanate with water to yield a urea group-containing polyisocyanate and separting and recovering said urea group-containing, finely divided solid polyisocyanates.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the reaction of said organic polyisocyanate with water is conducted in the presence of a catalyst while maintaining a pH of 7 to 10, optionally with the addition of a base.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein said protective colloid comprises a member selected from the group consisting of polyvinyl alcohols, methyl cellulose, polyacrylates, polyacrylamides and polymethylvinylether/maleic acid anhydride copolymers.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein said protective colloid comprises a member selected from the group consisting of polyvinyl alcohols and methyl cellulose.
Claim 6
Dependent Claim
50 words
The process of claim 1 wherein the reaction is conducted in the presence of a nonionic, anionic and/or cationic surface-active agent having an HLB value of about 10 to 18, said surface-active agents being present in a quantity of about 0.001 to 3% by weight, based on the aqueous phase.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein said organic polyisocyanate is present in an amount of about 10 to 30% by weight, based on the total reaction mixture.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said organic polyisocyanate is 2,4-toluylene diisocyanate.
Claim 9
Dependent Claim
56 words
The process of claim 1 wherein the emulsifying or suspending step comprises mechanically intensively dispersing the polyisocyanate in the aqueous medium comprising water and the protective colloid to produce droplets with a particle size of about 0.5 to 20 μm and reacting said organic polyisocyanate with water at a temperature of about 20° to 40° C.
Claim 10
Dependent Claim
18 words
The process of claim 2 which comprises deactivating or removing the catalyst before separating the solid urea diisocyanate.
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |