US5030664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialkyl dicarbonates as blowing agents for polymers
Assignee: Akzo NV
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Filing: 1990-12-04
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Granted: 1991-07-09
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Expires: 2010-12-04
Abstract
Abstract The present invention pertains to a composition of matter and to a method of using the composition to produce foamed plastics, wherein a major, auxiliary source of blowing agent for the foam is the decomposition of dialkyl dicarbonates. The dialkyl dicarbonates can be decomposed over temperatures ranging from about 10 DEG C. to about 45 DEG C. when used in combination with particular tertiary amine decomposition catalysts.
Inventors
- 👤 Ralph Franklin
- 👤 William J. Parr
- 👤 Gerald Fesman
- 👤 Barry A. Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A method of producing polymeric foams wherein at least one of the blowing agents used is a catalyzed blowing agent capable of generating carbon dioxide gas at about room temperature, said method comprising the steps of: (a) providing a polyurethane and at least one blowing agent comprising a dicarbonate having alkyl substituent end groups, (b) combining said dicarbonate compound with at least one dicarbonate decomposition catalyst comprising a tertiary amine having at least one sterically accessable nitrogen which exhibits nucleophilicity; and (c) using the combination of said blowing agent and said decomposition catalyst to initiate the generation of carbon dioxide gas at about room temperature.
Claim 2
Independent Claim
105 words
A method of producing polymeric foams wherein at least one of the blowing agents used is a catalyzed blowing agent capable of generating carbon dioxide gas at about room temperature, said method comprising the steps of: (a) providing a polyurethane and at least one blowing agent comprising a dicarbonate having alkyl substituent end groups, (b) combining said dicarbonate compound with at least one dicarbonate decomposition catalyst comprising a tertiary amine having at least one sterically accessable nitrogen which exhibits nucleophilicity; and (c) using the combination of said blowing agent and said decomposition catalyst to initiate the generation of carbon dioxide gas at about room temperature.
Claim 3
Dependent Claim
62 words
The method of claim 1 wherein said combination of blowing agent with said decomposition catalyst is tailored to the reaction rate of the polymeric reactants used to generate the polymeric portion of said foam, whereby the gellation of said polymeric portion of said foam and the generation of said carbon dioxide gas by said dicarbonate produces a polymeric foam having designated characteristics.
Claim 4
Dependent Claim
40 words
The method of claim 1 wherein said decomposition catalyst is selected from the group consisting of molecules having a bridgehead nitrogen, tertiary 4-amino derivatives of pyridine, dimethyl alkyl amine, poly dimethyl alkyl amine containing a linking group, and combinations thereof.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said blowing agent includes a linking group between the di-carbonate portions of said molecule.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said alkyl substituent contains from 1-10 carbon atoms.
Claim 7
Dependent Claim
13 words
The method of claim 5 wherein said alkyl substituent is halogenated or polyhalogenated.
Claim 8
Dependent Claim
18 words
The method of claim 5 wherein at least one of said alkyl substituent groups is a tertiary alkyl.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein a linking group is present between the di-carbonate portions of said molecules.
Claim 10
Dependent Claim
18 words
The method of claim 7 wherein a linking group is present between the di-carbonate portions of said molecule.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein said polyurethane foam is produced according to a flexible formulation.
Claim 12
Dependent Claim
16 words
The method of claim 1 wherein said polyurethane foam is produced according to a rigid formulation.
Claim 13
Dependent Claim
22 words
The method of claim 1 wherein an additional blowing agent comprising a chlorofluorocarbon is used in combination with said dicarbonate blowing agent.
References Cited (Backward Citations)
US3573233A
Cited
US3573232A
Cited
FR2220564A1
Cited
US4110273A
Cited
US4070310A
Cited
US4297442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |