US3960916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of organic isocyanates
Assignee: BASF SE
•
Filing: 1975-01-24
•
Granted: 1976-06-01
•
Expires: 1995-01-24
Abstract
Abstract Organic isocyanates are manufactured, in the absence of organic solvents, by reaction of primary organic amines with hydrogen chloride, to give amine hydrochlorides, subsequent phosgenation, and thermal decomposition of the carbamyl chlorides formed as intermediates.
Inventors
- 👤 Werner Fuchs
- 👤 Rolf Platz
- 👤 Volker Vogt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:33
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A method of preparing organic isocyanates which comprises: a. mixing a primary amine with at least one mole of hydrogen chloride per amino group of said primary amine in the absence of an organic solvent and simultaneosly grinding the reaction mixture to an average particle size of from about 1 to about 100μ and b. reacting the resulting suspension of amine hydrochloride in hydrogen chloride with at least 2 moles of phosgene per amine hydrochloride group in the absence of an organic solvent at a temperature of from about 100° to about 180°C and at a pressure of from about 14 to about 55 bar to form the corresponding isocyanate.
Claim 2
Independent Claim
110 words
A method of preparing organic isocyanates which comprises: a. mixing a primary amine with at least one mole of hydrogen chloride per amino group of said primary amine in the absence of an organic solvent and simultaneosly grinding the reaction mixture to an average particle size of from about 1 to about 100μ and b. reacting the resulting suspension of amine hydrochloride in hydrogen chloride with at least 2 moles of phosgene per amine hydrochloride group in the absence of an organic solvent at a temperature of from about 100° to about 180°C and at a pressure of from about 14 to about 55 bar to form the corresponding isocyanate.
Claim 3
Dependent Claim
28 words
A process for the manufacture of organic isocyanates, as set forth in claim 1, wherein organic aliphatic, cycloaliphatic and aromatic diamines and/or polyamines are used as primary amines.
Claim 4
Dependent Claim
50 words
A process for the manufacture of organic isocyanates as set forth in claim 2, wherein 2,4-toluylenediamine, 2,6-toluylenediamine, mixtures of 2,4-toluylenediamine and 2,6-toluylenediamine, 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane, mixtures of 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethanes, 2,4,6-triaminotoluene, mixtures of polyphenyl-polymethylene-polyamines and mixtures of diaminodiphenylmethanes and polyphenyl-polymethylene-polyamines are used as primary aromatic diamines and/or polyamines.
Claim 5
Dependent Claim
32 words
A process for the manufacture of organic isocyanates as set forth in claim 1, wherein from 5 to 25 moles of hydrogen chloride are used per amino group of the primary amine.
Claim 6
Dependent Claim
32 words
A process for the manufacture of organic isocyanates as set forth in claim 1, wherein from 3 to 8 moles of phosgene are used per amino group of the primary amine hydrochloride.
Claim 7
Dependent Claim
25 words
A process for the manufacture of organic isocyanates as set forth in claim 1, wherein the amine hydrochloride is formed in the presence of phosgene.
Claim 8
Dependent Claim
127 words
The method of preparing organic isocyanates as set forth in claim 6 which comprises: a. mixing a primary amine with at least one mole hydrogen chloride per amino group of said primary amine in the presence of at least 2 moles of phosgene per amino group of said primary amine in the absence of an organic solvent and simultaneously grinding the reaction mixture to an average particle size from about 1 to 100μ and b. heating the resulting suspension of amine hydrochloride and carbamyl chloride in a mixture of hydrogen chloride and phosgene in the absence of an organic solvent at a temperature of from about 100° to about 180°C and at a pressure of from about 14 to about 55 bar to form the corresponding isocyanate.
Claim 9
Dependent Claim
34 words
A process for the manufacture of organic isocyanates as set forth in claim 1, wherein the reaction mixture is ground at energy densities of about 10 to about 1,000 kW/cubic meter of grinding volume.
References Cited (Backward Citations)
US2326501A
Cited
US3631092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |