Patent US4251637A successfully refreshed from Google Patents.
US4251637A
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Tertiary amino substituted oxazolidines as polyisocyanurate catalysts
Assignee: Huntsman Corp
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Filing: 1979-09-13
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Granted: 1981-02-17
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Expires: 1999-09-13
Abstract
Abstract The use of tertiary amino substituted oxazolidines as polyisocyanurate catalysts is disclosed. 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
- 👤 Howard P. Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:07
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2081; C08G18/2009; C08G18/2018; C08G2115/00; C08G2115/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 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 a tertiary amino substituted oxazolidine falling within the following structural formula ##STR3## where R 1 and R 2 taken singly are lower alkyl groups or R 1 andR 2 taken jointly together with the adjacent nitrogen atom are cycloalkyl or morpholino and R 3 and R 4 are each taken from the group consisting of hydrogen and lower alkyl and n is about 2 to 4.
Claim 2
Dependent Claim
108 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 a tertiary amino substituted oxazolidine falling within the following structural formula ##STR3## where R 1 and R 2 taken singly are lower alkyl groups or R 1 andR 2 taken jointly together with the adjacent nitrogen atom are cycloalkyl or morpholino and R 3 and R 4 are each taken from the group consisting of hydrogen and lower alkyl and n is about 2 to 4.
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
12 words
The process of claim 3 wherein a rigid polyisocyanurate foam is produced.
Claim 6
Dependent Claim
66 words
A polyisocyanurate catalyst compound having a structural formula as follows: ##STR4## where R 1 and R 2 taken singly are lower alkyl groups or R 1 and R 2 taken jointly together with the adjacent nitrogen atom are cycloalkyl or morpholino and R 3 and R 4 are each taken from the group consisting of hydrogen and lower alkyl and n is about 2 to 4.
Claim 7
Dependent Claim
66 words
A polyisocyanurate catalyst compound having a structural formula as follows: ##STR4## where R 1 and R 2 taken singly are lower alkyl groups or R 1 and R 2 taken jointly together with the adjacent nitrogen atom are cycloalkyl or morpholino and R 3 and R 4 are each taken from the group consisting of hydrogen and lower alkyl and n is about 2 to 4.
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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |