Patent US4518718A successfully refreshed from Google Patents.
US4518718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid zeolite containing polyurethane foams
Assignee: United States, AS REPRESENTED BY UNIED STATES DEPARTMENT OF ENERGY
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Filing: 1984-05-18
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Granted: 1985-05-21
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Expires: 2004-05-18
Abstract
Abstract A closed cell rigid polyurethane foam has been prepared which contains up to about 60% by weight of molecular sieves capable of sorbing molecules with effective critical diameters of up to about 10 ANGSTROM . The molecular sieve component of the foam can be preloaded with catalysts or with reactive compounds that can be released upon activation of the foam to control and complete crosslinking after the foam is formed. The foam can also be loaded with water or other flame-retarding agents, after completion. Up to about 50% of the weight of the isocyanate component of the foam can be replaced by polyimide resin precursors for incorporation into the final polymeric network.
Inventors
- 👤 Charles B. Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/183; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/088; C08G18/0885; C08G18/14; C08G18/16; C08G18/28; C08G18/67; C08G18/675; C08G18/677; C08G18/678; C08L; C08L75/00; C08L75/04; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
75 words
A process for the preparation of a closed cell rigid polyurethane foam by mixing intimately a polyol component with an isocyanate component and curing the resulting mixture, comprising: (a) dispersing into each component finely divided zeolite capable of sorbing molecules with effective critical diameters of up to about 10 Å, said zeolite constituting up to about 60% of the final foam weight; and (b) adding a blowing agent to each component before combining said components.
Claim 2
Dependent Claim
75 words
A process for the preparation of a closed cell rigid polyurethane foam by mixing intimately a polyol component with an isocyanate component and curing the resulting mixture, comprising: (a) dispersing into each component finely divided zeolite capable of sorbing molecules with effective critical diameters of up to about 10 Å, said zeolite constituting up to about 60% of the final foam weight; and (b) adding a blowing agent to each component before combining said components.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the blowing agent is a halocarbon refrigeration gas.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the zeolite is preloaded with a substance that can react with the foam after the latter is formed.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein the preloaded substance is water.
Claim 6
Dependent Claim
16 words
The process of claim 3 wherein the preloaded substance is a small polyfunctional active hydrogen-containing molecule.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein the polyfunctional molecule is 1,4-butanediol.
Claim 8
Dependent Claim
18 words
The process of claim 3 wherein the preloaded substance is a catalyst for the trimerization of isocyanate groups.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein a mixture of polyimide precursors constituting up to 50% of the isocyanate component weight is dissolved in said component.
Claim 10
Dependent Claim
16 words
The process of claim 1 wherein an unreactive gas is sorbed into the zeolite before dispersion.
Claim 11
Dependent Claim
15 words
The process of claim 9 wherein the gas is CO 2 or N 2 .
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein the foam is activated by means of microwave energy.
Claim 13
Dependent Claim
9 words
A foam prepared by the process of claim 1.
Claim 14
Dependent Claim
9 words
A foam prepared by the process of claim 3.
Claim 15
Dependent Claim
9 words
A foam prepared by the process of claim 7.
Claim 16
Dependent Claim
9 words
A foam prepared by the process of claim 8.
Claim 17
Dependent Claim
46 words
A closed cell polyurethane foam comprising up to about 60% by weight of a zeolite capable of sorbing molecules with effective diameters of up to 10 Å, wherein 40% of the weight of the polyurethane has been replaced with polyimide resin precursors interpolymerized with said polyurethane.
Claim 18
Dependent Claim
46 words
A closed cell polyurethane foam comprising up to about 60% by weight of a zeolite capable of sorbing molecules with effective diameters of up to 10 Å, wherein 40% of the weight of the polyurethane has been replaced with polyimide resin precursors interpolymerized with said polyurethane.
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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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |