Patent US4731428A successfully refreshed from Google Patents.
US4731428A
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Epoxidized isocyanates and process for their preparation
Assignee: Wyeth Holdings LLC
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Filing: 1986-11-03
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Granted: 1988-03-15
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Expires: 2006-11-03
Abstract
Abstract A process is disclosed for preparation of novel epoxy-substituted aralkyl isocyanates by reaction of tertiary aralkyl olefins and an epoxidizing agent at a temperature of from -35° C. to about 50° C. The compounds are useful as intermediates to produce curing agents for polyfunctional active hydrogen-containing compounds, e.g., by reaction with polyols to produce epoxy-pendant urethanes and then with polyamines, and the like.
Inventors
- 👤 Paul S. Waterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:32
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/36; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/833; C08G18/70; C08G18/71; C08G18/711; C08G59/00; C08G59/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
56 words
A curable composition comprising: (a) a compound having at least two active hydrogen-containing functional groups; and (b) an effective amount of an epoxy-pendant polyurethane curing agent for (a) which comprises a reaction product of: (i) a polyol; and (ii) an epoxidized isocyanate selected from those of the formulae: ##STR7## or a mixture of (I) and (II).
Claim 2
Dependent Claim
56 words
A curable composition comprising: (a) a compound having at least two active hydrogen-containing functional groups; and (b) an effective amount of an epoxy-pendant polyurethane curing agent for (a) which comprises a reaction product of: (i) a polyol; and (ii) an epoxidized isocyanate selected from those of the formulae: ##STR7## or a mixture of (I) and (II).
Claim 3
Dependent Claim
15 words
A curable composition as defined in claim 1 wherein component (a) is a polyalkylene polyamine.
References Cited (Backward Citations)
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |