US4675401A
Expired / Lapsed
US
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Process for preparing polyisocyanato/polyisocyanurates by catalytic cyclotrimerization of polyisocyanates
Assignee: Rhone Poulenc Specialites Chimiques
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Filing: 1985-10-30
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Granted: 1987-06-23
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Expires: 2005-10-30
Abstract
Abstract Polyisocyanurate/polyisocyanates of enhanced stability are prepared by partial catalytic cyclotrimerization of a polyisocyanate in the presence of a catalytically effective amount of an aminosilyl catalyst and wherein the cyclotrimerization reaction is terminated when a predetermined desired amount of isocyanurate groups has been attained, by adding to the reaction mixture, after the cooling thereof to a temperature of below 50° C., a reaction terminating amount of an organic catalyst deactivating compound comprising at least one free hydroxyl moiety, or the reaction product of such hydroxylated organic catalyst deactivating compound with an isocyanate.
Inventors
- 👤 Jean Robin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:42
CPC Classifications
B; B01; B01J; B01J38/00; B01J38/48; B01J38/68; C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/34; C08; C08G; C08G18/00; C08G18/02; C08G18/022; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A process for the preparation of a polyisocyanato-polyisocyanurate by the catalytic cyclotrimerization of an aliphatic or cycloaliphatic polyisocyanate in the presence of a catalytically effective amount of an aminosilyl catalyst and wherein the cyclotrimerization reaction is terminated when a predetermined desired amount of isocyanurate groups has been attained, by adding to the reaction mixture a reaction terminating amount of an organic catalyst deactivating compound comprising at least one free hydroxyl moiety, or the reaction product of such hydroxylated organic catalyst deactivating compound with an isocyanate, the improvement which comprises adding said catalyst deactivating compound to said reaction mixture after the temperature thereof has been cooled to a temperature of below 50° C.
Claim 2
Dependent Claim
112 words
A process for the preparation of a polyisocyanato-polyisocyanurate by the catalytic cyclotrimerization of an aliphatic or cycloaliphatic polyisocyanate in the presence of a catalytically effective amount of an aminosilyl catalyst and wherein the cyclotrimerization reaction is terminated when a predetermined desired amount of isocyanurate groups has been attained, by adding to the reaction mixture a reaction terminating amount of an organic catalyst deactivating compound comprising at least one free hydroxyl moiety, or the reaction product of such hydroxylated organic catalyst deactivating compound with an isocyanate, the improvement which comprises adding said catalyst deactivating compound to said reaction mixture after the temperature thereof has been cooled to a temperature of below 50° C.
Claim 3
Dependent Claim
33 words
The process as defined by claim 1, comprising adding said catalyst deactivating compound to said reaction mixture after the temperature thereof has been cooled to a temperature of from 15° to 40° C.
Claim 4
Dependent Claim
23 words
The process as defined by claim 1, said catalyst deactivating compound comprising an enol, alcohol, polyol, phenol, polyphenol, ketoxime, or hydroxysilylated organosilicon compound.
Claim 5
Dependent Claim
24 words
The process as defined by claim 3, said catalyst deactivating compound comprising a primary or secondary monoalcohol having from 1 to 8 carbon atoms.
Claim 6
Dependent Claim
16 words
The process as defined by claim 4, said monoalcohol having from 3 to 6 carbon atoms.
Claim 7
Dependent Claim
27 words
The process as defined by claim 1, wherein the amount of catalyst deactivating compound added, expressed in moles per mole of catalyst, ranges from 0.5 to 2.
Claim 8
Dependent Claim
20 words
The process as defined by claim 1, wherein said aminosilyl cyclotrimerization catalyst comprises an aminosilane, diaminosilane, monosilylurea, disilylurea or silazane.
References Cited (Backward Citations)
US4537961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |