Patent US4927863A successfully refreshed from Google Patents.
US4927863A
Expired / Lapsed
US
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Process for producing closed-cell polyurethane foam compositions expanded with mixtures of blowing agents
Assignee: EIDP Inc
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Filing: 1989-09-18
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Granted: 1990-05-22
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Expires: 2009-09-18
Abstract
Abstract A process is disclosed comprising mixing selected shrinkage-minimizing halocarbons with selected two-carbon hydrogen-containing halocarbons, HCFC-123, HCFC-123a and HCFC-141b, and using this mixture as a blowing agent to produce minimal shrinkage closed-cell polyurethane foams.
Inventors
- 👤 Philip L. Bartlett
- 👤 Joseph A. Creazzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:03
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/144; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A process comprising mixing at least 1 wt. percent to 59 wt. percent of a shrinkage-minimizing halocarbon selected from the group consisting of CFC-11, CFC-12, HCFC-22, HFC-32, CFC-113, CFC-114, HCFC-124, HCFC-133a, HFC-134a, HCFC-142b and HFC-152a, and 99 to 41 wt. percent of a two-carbon hydrogen-containing halocarbon selected from the group consisting of HCFC-123, HCFC-123a and HCFC-141b, to form a mixture, and, thereafter, using the mixture to produce a minimal shrinkage closed-cell polyurethane foam.
Claim 2
Dependent Claim
73 words
A process comprising mixing at least 1 wt. percent to 59 wt. percent of a shrinkage-minimizing halocarbon selected from the group consisting of CFC-11, CFC-12, HCFC-22, HFC-32, CFC-113, CFC-114, HCFC-124, HCFC-133a, HFC-134a, HCFC-142b and HFC-152a, and 99 to 41 wt. percent of a two-carbon hydrogen-containing halocarbon selected from the group consisting of HCFC-123, HCFC-123a and HCFC-141b, to form a mixture, and, thereafter, using the mixture to produce a minimal shrinkage closed-cell polyurethane foam.
Claim 3
Dependent Claim
49 words
The process of claim 1 wherein the mixture is first dissolved in a polyol containing a surfactant and catalyst to form a B-side system which is, in turn, reacted with isocyanates to produce said polyurethane foam, said mixture comprising about 2 to 60 wt. percent of the B-side system.
Claim 4
Dependent Claim
37 words
The process of claim 1 wherein the mixture is combined with surfactant and an isocyanate to form one component and, thereafter, the component is reacted with a polyol and a catalyst to produce said closed-cell polyurethane foam.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the mixture comprises about 10 to 40 wt. percent of the shrinkage-minimizing halocarbon and about 90 to 60 wt. percent of the two-carbon hydrogen-containing halocarbon.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the mixture comprises about 80 wt. percent HCFC-123 and about 20 wt. percent HCFC-11.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the shrinkage-minimizing halocarbon comprises about 0.1 to 25 wt. percent of a polyurethane reaction formulation.
Claim 8
Dependent Claim
21 words
The process of claim 6 wherein the shrinkage-minimizing halocarbon comprises about 0.5 to 15 wt. percent of the polyurethane reaction formulation.
Claim 9
Dependent Claim
21 words
The process of claim 1 wherein the polyurethane foam has a density of about 1.5 to 2.5 pounds per cubic foot.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein the polyurethane foam has a density of about 1.2 to 1.5 pounds per cubic foot.
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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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |