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US5084485A
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Process for the production of rigid foams containing urethane and predominantly isocyanurate groups and their use as insulating materials
Assignee: Bayer AG
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Filing: 1991-06-21
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Granted: 1992-01-28
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Expires: 2011-06-21
Abstract
Abstract Rigid foams containing urethane and isocyanurate groups are made by reacting a polyisocyanate with a compound containing at least two isocyanate reactive hydrogen atoms in the presence of an aqueous solution of alkali metal carboxylate in accordance with known techniques. The aqueous alkali metal carboxylate solution has an alkali metal carboxylate content of from about 10 to about 50% by weight. The alkali metal carboxylates are preferably alkali metal acetates such as potassium acetate. This process is carried out at an index above 150. The product foams are particularly useful as insulating materials.
Inventors
- 👤 Gerhard Heilig
- 👤 Rolf Wiedermann
- 👤 Wolfgang Schmitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08G18/16; C08G18/22; C08G18/225; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A process for the production of rigid foams containing urethane and isocyanurate groups comprising reacting a) a polyisocyanate with b) a compound having at least two isocyanate-reactive hydrogen atoms and a molecular weight of from about 400 to about 10,000 at an index greater than 150 in the presence of c) an aqueous solution of an alkali metal carboxylate in which the alkali metal carboxylate content is from about 10 to about 50% by weight.
Claim 2
Dependent Claim
75 words
A process for the production of rigid foams containing urethane and isocyanurate groups comprising reacting a) a polyisocyanate with b) a compound having at least two isocyanate-reactive hydrogen atoms and a molecular weight of from about 400 to about 10,000 at an index greater than 150 in the presence of c) an aqueous solution of an alkali metal carboxylate in which the alkali metal carboxylate content is from about 10 to about 50% by weight.
Claim 3
Dependent Claim
16 words
The process of claim 1 in which the index is from about 170 to about 300.
Claim 4
Dependent Claim
14 words
The process of claim 1 in which the alkali metal carboxylate is potassium acetate.
Claim 5
Dependent Claim
22 words
The process of claim 1 in which the alkali metal carboxylate is from about 20 to about 40% by weight of c).
Claim 6
Dependent Claim
29 words
The process of claim 1 in which c) is used in an amount such that the reaction mixture contains at least 1% by weight water, based on the polyisocyanate.
Claim 7
Dependent Claim
29 words
The process of claim 1 in which c) is used in an amount such that the reaction mixture contains at least 1.4% by weight water, based on the polyisocyanate.
Claim 8
Dependent Claim
36 words
The process of claim 1 in which a chain extending and/or crosslinking agent having at least two isocyanate-reactive hydrogen atoms and a molecular weight of from about 32 to 399 is included in the reaction mixture.
Claim 9
Dependent Claim
18 words
The process of claim 1 in which a halogen-free flame retarding agent is included in the reaction mixture.
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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) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |