Patent US4448938A successfully refreshed from Google Patents.
US4448938A
Expired / Lapsed
US
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Modified isocyanate compositions, their production and uses for polyurethane manufacture
Assignee: Huntsman International LLC
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Filing: 1979-12-06
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Granted: 1984-05-15
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Expires: 1999-12-06
Abstract
Abstract Isocyanate compositions derived from diphenylmethane diisocyanate (MDI) which are a mixture of A) the reaction product of MDI with a polyether polyol or amine of molecular weight from 600 to 10,000 and B) a uretonimine modified MDI, the weight ratio of A to B being from 19:1 to 1:1. Also polyurethanes, especially elastomers prepared therefrom.
Inventors
- 👤 Alphonse E. Bruyninckx
- 👤 Martin F. Brooks
- 👤 David Thorpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C08G18/08; C08G18/10; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A liquid isocyanate composition which has low temperature stability such that when stored it remains crystal-free for more than 10 days at 0° C., said composition being derived from diphenylmethane diisocyanate and comprising: (A) the product of reaction of 90-45% by weight of diphenylmethane diisocyanate with 10-55% by weight of a polyether of an alcohol or an amine of molecular weight from 600 to 10,000, the indicated percentages by weight being based on the weight of the reaction product; and a uretonimine modified diphenylmethane diisocyanate, the weight ratio of A to B being from 19:1 to 1:1.
Claim 2
Dependent Claim
97 words
A liquid isocyanate composition which has low temperature stability such that when stored it remains crystal-free for more than 10 days at 0° C., said composition being derived from diphenylmethane diisocyanate and comprising: (A) the product of reaction of 90-45% by weight of diphenylmethane diisocyanate with 10-55% by weight of a polyether of an alcohol or an amine of molecular weight from 600 to 10,000, the indicated percentages by weight being based on the weight of the reaction product; and a uretonimine modified diphenylmethane diisocyanate, the weight ratio of A to B being from 19:1 to 1:1.
Claim 3
Dependent Claim
55 words
An isocyanate composition according to claim 1 made by a process in which diphenylmethane diisocyanate is partly converted to the uretonimine derivative, then a polyether polyol or amine is added, the degree of conversion and the amount of polyether polyol or amine added being chosen so as to give the ratio stated in claim 1.
Claim 4
Dependent Claim
35 words
An isocyanate composition comprising a composition according to claim 1 to which has been added up to 50% of its weight of diphenyl methane diisocyanate, containing from 1 to 60% weight of the 2,4' isomer.
Claim 5
Dependent Claim
26 words
An isocyanate composition according to claim 1 together with sufficient polyisocyanate of a sufficient functionality such that the resultant composition has an isocyanate functionality of 2.3.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |