US5290823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of rigid polyurethane foams, and a blowing agent mixture for this purpose
Assignee: BASF SE
•
Filing: 1993-01-11
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Granted: 1994-03-01
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Expires: 2013-01-11
Abstract
Abstract The invention relates to a process for the production of rigid polyurethane foams using a specific blowing agent mixture of highly fluorinated and/or perfluorinated organic compounds, cyclopentane and, if desired, aliphatic and/or further cycloaliphatic hydrocarbons having 4 to 8 carbon atoms.
Inventors
- 👤 Otto Volkert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:19
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C08J2203/00; C08J2203/16; C08J2203/162; C08J2203/164; C08J2205/00; C08J2205/10; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
126 words
A process for the production of rigid polyurethane foams by reacting a) organic and/or modified organic polyisocyanates with b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired, c) low-molecular-weight chain extenders and/or crosslinking agents, in the presence of d) blowing agents, e) catalysts and, if desired, f) assistants and/or additives, which comprises using, as blowing agent (d), a mixture of (d1) from 5 to 40% by weight of at least one highly fluorinated and/or perfluorinated organic compound, said highly fluorinated organic compound being at least 85% fluorinated, (d2) from 30 to 95% by weight of cyclopentane and (d3) from 0 to 45% by weight of at least one aliphatic and/or cycloaliphatic hydrocarbon having 4 to 8 carbon atoms.
Claim 2
Dependent Claim
126 words
A process for the production of rigid polyurethane foams by reacting a) organic and/or modified organic polyisocyanates with b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired, c) low-molecular-weight chain extenders and/or crosslinking agents, in the presence of d) blowing agents, e) catalysts and, if desired, f) assistants and/or additives, which comprises using, as blowing agent (d), a mixture of (d1) from 5 to 40% by weight of at least one highly fluorinated and/or perfluorinated organic compound, said highly fluorinated organic compound being at least 85% fluorinated, (d2) from 30 to 95% by weight of cyclopentane and (d3) from 0 to 45% by weight of at least one aliphatic and/or cycloaliphatic hydrocarbon having 4 to 8 carbon atoms.
Claim 3
Dependent Claim
31 words
A process as claimed in claim 1, wherein the blowing agent (d) is employed in an amount of from 5 to 15% by weight, based on the relatively high-molecular-weight compound (b).
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the blowing agent (d) is emulsified in the organic and/or modified organic polyisocyanate (a).
Claim 5
Dependent Claim
27 words
A process as claimed in claim 1, wherein the blowing agent (d) is emulsified in the relatively high-molecular-weight compound containing at least two reactive hydrogen atoms (b).
Claim 6
Dependent Claim
43 words
A process as claimed in claim 1, wherein the amount of component (d1) is from 40 to 90 percent by weight based on mixture (d), and the amount of component (d3) is at least 5 percent by weight, based upon the mixture (d).
Claim 7
Dependent Claim
26 words
A process as claimed in claim 1, wherein the mixture (d) comprises solely components (d1) and (d2) in a weight ratio of 10:90 to 40:60, respectively.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 1, further comprising water as a blowing agent in an amount of 0.5 to 3 percent by weight based on the weight of component (b).
Claim 9
Dependent Claim
29 words
A process as claimed in claim 1, wherein the mixture (d1) is mixed with component (a) or component (b) in the presence of an emulsifier comprising an oligomeric acrylate.
Claim 10
Dependent Claim
20 words
A process as claimed in claim 1, wherein (d1) consists of an aliphatic or cycloaliphatic hydrocarbon liquid at room temperature.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 9, wherein the aliphatic or cycloaliphatic hydrocarbon liquid at room temperature has 5 to 8 carbon atoms.
Claim 12
Dependent Claim
18 words
A process as claimed in claim 10, wherein the liquid hydrocarbon has from 5 to 6 carbon atoms.
Claim 13
Dependent Claim
24 words
A process as claimed in claim 1, wherein the organic compound consists of a linear or cyclic ether having 4 to 12 carbon atoms.
Claim 14
Dependent Claim
19 words
A process as claimed in claim 12, wherein the ether is linear and has 4 to 6 carbon atoms.
References Cited (Backward Citations)
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Cited
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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) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |