Patent US5136086A successfully refreshed from Google Patents.
US5136086A
Expired / Lapsed
US
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Preparation process of aliphatic isocyanate
Assignee: Mitsui Chemicals Inc
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Filing: 1992-01-13
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Granted: 1992-08-04
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Expires: 2012-01-13
Abstract
Abstract This invention is an industrially efficient and improved process for the preparation of aliphatic polyisocyanates by using esters as the solvent for converting aliphatic polyamines to isocyanates.
Inventors
- 👤 Teruyuki Nagata
- 👤 Masaru Wada
- 👤 Hideki Mizuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:48
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
A process for the preparation of an aliphatic polyisocyanate comprising (i) converting a polyamine to a polyamine hydrochloride by reacting the polyamine with hydrogen chloride gas in the presence of a reaction solvent, and then (ii) reacting the aliphatic polyamine hydrochloride with phosgene, wherein an ester is used as the reaction solvent, and wherein the polyamine is converted to the polyamine hydrochloride with hydrogen chloride gas at temperature of from 100° to 160° C.
Claim 2
Dependent Claim
74 words
A process for the preparation of an aliphatic polyisocyanate comprising (i) converting a polyamine to a polyamine hydrochloride by reacting the polyamine with hydrogen chloride gas in the presence of a reaction solvent, and then (ii) reacting the aliphatic polyamine hydrochloride with phosgene, wherein an ester is used as the reaction solvent, and wherein the polyamine is converted to the polyamine hydrochloride with hydrogen chloride gas at temperature of from 100° to 160° C.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein the ester is a fatty acid alkyl ester.
Claim 4
Dependent Claim
27 words
A process according to claim 1, wherein the amount of the solvent is in a ratio from 8/1 to 16/1 by weight of the aliphatic polyamine hydrochloride.
Claim 5
Dependent Claim
13 words
A process according to claim 1, wherein hexamethylenediamine hydrochloride is reacted with phosgene.
References Cited (Backward Citations)
GB1037933A
Cited
GB1038129A
Cited
GB1050555A
Cited
GB1086782A
Cited
US3631198A
Cited
US4922005A
Cited
EP0384463A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |