US5272183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
HCFC blown rigid foams with low thermal conductivity
Assignee: Bayer Corp
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Filing: 1993-05-25
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Granted: 1993-12-21
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Expires: 2013-05-25
Abstract
Abstract Rigid polyurethane foams having low thermal conductivity values are produced by reacting an organic polyisocyanate with an organic material having at least two isocyanate reactive hydrogen atoms and an OH value of from about 200 to about 650 in the presence of a blowing agent. The blowing agent is a mixture of 1,1-dichloro-2,2,2-trifluoroethane (HCFC-123) or dichlorofluoroethane (HCFC-141b) and from about 0.1 to about 1.0% by weight (based on total weight of the foam forming mixture) water. The foams obtained are characterized by a thermal conductivity of less than about 0.130 Btu-in./hr.ft 2 . F, preferably less than about 0.120 Btu-in./hr.ft 2 . F. These foams are particularly useful as insulation materials.
Inventors
- 👤 Herman P. Doerge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:52
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: 11
Claim 1
Independent Claim
128 words
A process for the production of a rigid polyurethane foam having a thermal conductivity of less than about 0.130 Btu-in./hr.ft 2 . F comprising reacting a) an organic polyisocyanate with b) an organic material having at least two isocyanate-reactive hydrogen atoms and an OH value of from about 200 to about to about 650 which organic material has been prepared with an initiator selected from the group consisting of pentaerythritol, lactose, alpha-methylglucoside, alpha-hydroxyethylglucoside, hexitol, heptitol, sorbitol, dextrose, manitol, sucrose, methanediphenylamine, the reaction product of a phenol with formaldehyde and the reaction product of phenol with formaldehyde and a dialkanolamine in the presence of c) from about 0.1 to about 1.0% by weight of water and d) a blowing agent selected from the group consisting of 1,1-dichloro-2,2,2-trifluoroethane and dichlorofluoroethane.
Claim 2
Dependent Claim
128 words
A process for the production of a rigid polyurethane foam having a thermal conductivity of less than about 0.130 Btu-in./hr.ft 2 . F comprising reacting a) an organic polyisocyanate with b) an organic material having at least two isocyanate-reactive hydrogen atoms and an OH value of from about 200 to about to about 650 which organic material has been prepared with an initiator selected from the group consisting of pentaerythritol, lactose, alpha-methylglucoside, alpha-hydroxyethylglucoside, hexitol, heptitol, sorbitol, dextrose, manitol, sucrose, methanediphenylamine, the reaction product of a phenol with formaldehyde and the reaction product of phenol with formaldehyde and a dialkanolamine in the presence of c) from about 0.1 to about 1.0% by weight of water and d) a blowing agent selected from the group consisting of 1,1-dichloro-2,2,2-trifluoroethane and dichlorofluoroethane.
Claim 3
Dependent Claim
20 words
The process of claim 1 in which the polyisocyanate has an NCO content of from about 28 to about 34%.
Claim 4
Dependent Claim
32 words
The process of claim 1 in which the organic material having at least two isocyanate reactive hydrogen groups and an OH value of from about 200 to about 650 is a polyol.
Claim 5
Dependent Claim
31 words
The process of claim 1 in which the organic material having at least two isocyanate reactive groups is a mixture of (i) a polyether polyol and (ii) an aromatic ester polyol.
Claim 6
Dependent Claim
36 words
The process of claim 4 in which an amine polyol having at least two isocyanate reactive hydrogen atoms and an OH value of from about 200 to about 800 is included in the foam forming mixture.
Claim 7
Dependent Claim
13 words
The process of claim 5 in which the blowing agent d) is 1,1-dichloro-2,2,2-trifluoroethane.
Claim 8
Dependent Claim
25 words
The process of claim 6 in which the polyisocyanate is polymethylene polyphenyl polyisocyanate having an isocyanate group content of from about 28 to about 34%.
Claim 9
Dependent Claim
28 words
The process of claim 6 in which the polyisocyanate is an NCO-prepolymer of polymethylene polyphenyl polyisocyanate having an isocyanate group content of from about 29 to about 30%.
Claim 10
Dependent Claim
21 words
The process of claim 7 in which from about 0.15% to about 0.6% by weight water is present during the reaction.
Claim 11
Dependent Claim
21 words
The process of claim 8 in which from about 0.15% to about 0.6% by weight water is present during the reaction.
References Cited (Backward Citations)
US4927863A
Cited
JPH02123119A
Cited
US4943597A
Cited
US4960804A
Cited
US4945119A
Cited
JPH03137138A
Cited
JPH03137137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-20 | 1997-06-21 | 1997-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-20 | 2001-06-21 | 2001-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-20 | 2005-06-21 | 2005-12-21 | $7700.00 | Window Closed / Lapsed |