Patent US4286072A successfully refreshed from Google Patents.
US4286072A
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Novel polyisocyanurate catalysts
Assignee: Huntsman Corp
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Filing: 1980-07-21
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Granted: 1981-08-25
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Expires: 2000-07-21
Abstract
Abstract Polyisocyanurate catalysts are disclosed which have the formula: ##STR1## where R 1 and R 2 are independently selected from alkyl groups of less than about 3 carbon atoms or where R 1 and R 2 together comprise cycloalkyl or morpholino groups and where R 3 is hydrogen or alkyl groups containing less than about 3 carbon atoms. Said catalysts are useful in promoting the reaction between a polyol and an aromatic polyisocyanate to prepare a polymer containing recurring isocyanurate and urethane linkages.
Inventors
- 👤 Edward E. McEntire
- 👤 Robert L. Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1825; C08G18/1858; C08G2115/00; C08G2115/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
In a process for preparing a polymer containing recuring isocyanurate and urethane linkages, which polymer comprises the reaction product of a polyol and an aromatic polyisocyanate, while utilizing an isocyanurate group formation catalyst; the improvement which comprises employing as said isocyanurate catalyst a compound falling within the following structural formula: ##STR3## where R 1 and R 2 are independently selected from alkyl groups of less than about 3 carbon atoms or where R 1 and R 2 together comprise cycloalkyl or morpholino groups and where R 3 is hydrogen or alkyl groups containing less than about 3 carbon atoms.
Claim 2
Dependent Claim
99 words
In a process for preparing a polymer containing recuring isocyanurate and urethane linkages, which polymer comprises the reaction product of a polyol and an aromatic polyisocyanate, while utilizing an isocyanurate group formation catalyst; the improvement which comprises employing as said isocyanurate catalyst a compound falling within the following structural formula: ##STR3## where R 1 and R 2 are independently selected from alkyl groups of less than about 3 carbon atoms or where R 1 and R 2 together comprise cycloalkyl or morpholino groups and where R 3 is hydrogen or alkyl groups containing less than about 3 carbon atoms.
Claim 3
Dependent Claim
14 words
The process of claim 1 where said polyol is a polyether or polyester polyol.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein said polymer is a cellular polymer obtained by reacting said polyols in said polyisocyanate in the presence of a blowing agent.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein a rigid polyisocyanurate is produced.
Claim 6
Dependent Claim
43 words
In a process for preparing a polymer containing recurring isocyanurate and urethane linkages, which polymer comprises the reaction product of a polyol and an aromatic polyisocyanate, while utilizing an isocyanurate group formation catalyst; the improvement which comprises employing as said isocyanurate catalyst 1-(2,2-dimethylhydrazono)-2-hydroxyethane.
Claim 7
Dependent Claim
43 words
In a process for preparing a polymer containing recurring isocyanurate and urethane linkages, which polymer comprises the reaction product of a polyol and an aromatic polyisocyanate, while utilizing an isocyanurate group formation catalyst; the improvement which comprises employing as said isocyanurate catalyst 1-(2,2-dimethylhydrazono)-2-hydroxyethane.
Claim 8
Dependent Claim
14 words
The process of claim 5 where said polyol is a polyether or polyester polyol.
Claim 9
Dependent Claim
27 words
The process of claim 5 wherein said polymer is a cellular polymer obtained by reacting said polyols in said polyisocyanate in the presence of a blowing agent.
Claim 10
Dependent Claim
12 words
The process of claim 5 wherein a rigid polyisocyanurate foam is produced.
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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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |