US5286761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of low-fog flexible polyester polyurethane foams and their use in vehicles
Assignee: Bayer AG
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Filing: 1993-07-01
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Granted: 1994-02-15
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Expires: 2013-07-01
Abstract
Abstract Low-fog flexible polyester polyurethane foams are produced by reacting a) polyisocyanates, with b) polyesters containing at least two hydroxyl groups and having a molecular weight in the range from 400 to 10,000, in the presence of c) water and/or readily volatile organic compounds as blowing agents wherein prior to reacting, the polyesters have been subjected to continuous distillation over an average holding time of 2 to 600 s, at a temperature of 160° to 250° C., and under a pressure of 0.05 to 10 mbar. The reaction mixture may optionally contain d) compounds containing at least two active hydrogen atoms and having a molecular weight in the range from 32 to 400 as chain-extending and crosslinking agents, and/or e) auxiliaries and additives known per se. These low-fogging polyester polyurethane foams are extremely suitable for use in vehicles, preferably automobiles.
Inventors
- 👤 Manfred Naujoks
- 👤 Klaus Konig
- 👤 Manfred Schmidt
- 👤 Hans-Walter Illger
- 👤 Gunter Baatz
- 👤 Hansjurgen Rabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:29
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/88; C08G63/90; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/4241; C08G18/4244; C08G18/4247; C08G18/425; C08G18/65; C08G18/66; C08G2110/00; C08G2110/0008; C08G2110/0033; C08G2110/0083; C08G2290/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A process for the production of low-fog flexible polyester polyurethane foams comprising reacting a) polyisocyanates, and b) polyesters containing at least two hydroxyl groups and having a molecular weight in the range of from 400 to 10,000, in the presence of c) water and/or readily volatile organic compounds as blowing agents; wherein prior to reacting b) said polyesters have been subjected to continuous distillation for an average holding time of 2 to 600 seconds, at a temperature of from 160° to 250° C., and a pressure of from 0.05 to 10 mbar.
Claim 2
Dependent Claim
92 words
A process for the production of low-fog flexible polyester polyurethane foams comprising reacting a) polyisocyanates, and b) polyesters containing at least two hydroxyl groups and having a molecular weight in the range of from 400 to 10,000, in the presence of c) water and/or readily volatile organic compounds as blowing agents; wherein prior to reacting b) said polyesters have been subjected to continuous distillation for an average holding time of 2 to 600 seconds, at a temperature of from 160° to 250° C., and a pressure of from 0.05 to 10 mbar.
Claim 3
Dependent Claim
33 words
The process of claim 1 additionally comprising d) compounds containing at least two active hydrogen atoms and having a molecular weight in the range from 32 to 400 as chain-extending and crosslinking agents.
Claim 4
Dependent Claim
11 words
The process of claim 1 additionally comprising e) auxiliaries and/or additives.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said temperature is from 180° to 230° C.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein said pressure is from 0.1 to 3 mbar.
Claim 7
Dependent Claim
49 words
The process of claim 1, wherein said distillation of b) said polyester is carried out in the presence of an entraining agent comprising 1 to 5% by weight, based on the weight of said polyester, of an inert solvent having a boiling point of from 150° to 300° C.
Claim 8
Dependent Claim
54 words
The process of claim 6, wherein said entraining agent comprises from 1 to 10% by weight, based on the weight of said polyester, of one or more diols selected from the group consisting of ethylene glycol, propylene glycol, butane-1,2-diol, butane-1,4-diol, pentane-1,5-diol, 3-methylpentane-1,5-diol, hexanediol, 2-ethylhexane-1,3-diol, diethylene glycol, triethylene glycol, dipropylene glycol, and isomer mixtures thereof.
Claim 9
Dependent Claim
53 words
The process of claim 6 wherein said entraining agent comprises from 3 to 6% by weight, based on the weight of said polyester, of one or more diols selected from the group consisting of ethylene glycol, propylene glycol, butane-1,2-diol, butane-1,4-diol,pentane-1,5-diol, 3-methylpentane-1,5-diol, hexanediol, 2-ethylhexane-1,3-diol, diethylene glycol, triethylene glycol, dipropylene glycol, and isomer mixtures thereof.
Claim 10
Dependent Claim
28 words
The process of claim 6 wherein b) said polyester is prepared from adipic acid, diethylene glycol, and trimethylol propane or glycerol, and said entraining agent is diethylene glycol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |