US2644007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyamine hydrochlorides and polyisocyanates
Assignee: EIDP Inc
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Filing: 1951-10-08
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Granted: 1953-06-30
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Expires: 1971-10-08
Abstract
No abstract record available.
Inventors
- 👤 Carl F Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:44
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PROCESS FOR PREPARING AN ORGANIC POLYISOCYANATE WHICH COMPRISES INTRODUCING AT LEAST AN EQUIVALENT AMOUNT OF GASEOUS HYDROGEN CHLORIDE INTO A VIGOROUSLY AGITATED SOLUTION OF AN ORGANIC PRIMARY POLYAMINE IN AN INERT ORGANIC SOLVENT HAVING A BOILING POINT ABOVE 120* C., THIS SOLUTION BEING MAINTAINED AT A TEMPERATURE BETWEEN 120 AND 150* C. AND BELOW THE BOILING PONT OF THE SOLUTION, TO FORM A LOW VISCOSITY SUSPENSION OF THE CORRESPONDING POLYAMINE HYDROCHLORIDE, INTRODUCING PHOSGENE INTO THE SUSPENSION AT A TEMPERATURE BETWEEN 120 AND 200* C. AND BELOW THE BOILING POINT OF THE SOLUTION UNTIL HYDROGEN CHLORIDE IS NO LONGER EVOLVED, AND THEREAFTER, SEPARATING THE POLYISOCYANATE FROM THE SOLVENT.
Claim 2
Dependent Claim
108 words
A PROCESS FOR PREPARING AN ORGANIC POLYISOCYANATE WHICH COMPRISES INTRODUCING AT LEAST AN EQUIVALENT AMOUNT OF GASEOUS HYDROGEN CHLORIDE INTO A VIGOROUSLY AGITATED SOLUTION OF AN ORGANIC PRIMARY POLYAMINE IN AN INERT ORGANIC SOLVENT HAVING A BOILING POINT ABOVE 120* C., THIS SOLUTION BEING MAINTAINED AT A TEMPERATURE BETWEEN 120 AND 150* C. AND BELOW THE BOILING PONT OF THE SOLUTION, TO FORM A LOW VISCOSITY SUSPENSION OF THE CORRESPONDING POLYAMINE HYDROCHLORIDE, INTRODUCING PHOSGENE INTO THE SUSPENSION AT A TEMPERATURE BETWEEN 120 AND 200* C. AND BELOW THE BOILING POINT OF THE SOLUTION UNTIL HYDROGEN CHLORIDE IS NO LONGER EVOLVED, AND THEREAFTER, SEPARATING THE POLYISOCYANATE FROM THE SOLVENT.
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) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |