US5374705A
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US
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Process for the preparation of polyether polyols with a reduced unsaturation content
Assignee: Dow Chemical Co
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Filing: 1993-12-27
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Granted: 1994-12-20
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Expires: 2013-12-27
Abstract
Abstract Polyether polyols are by reacting an alkylene oxide comprising propylene oxide with an initiator containing at least three active hydrogen atoms per molecule. The reaction is conducted in the presence of an alkoxylation catalyst which is barium, strontium and their oxides, hydroxides, hydrated hydroxides or monohydroxide salts, or mixtures thereof; and in the presence of from about 1 to about 10 weight percent, based on total weight of initiator, of a processing aid that is an organic monohydroxyl- or dihydroxyl-containing substance having a molecular weight of at least 30, or a mixture thereof. The processing aid enhances the ability to obtain polyether polyols having a reduced unsaturation content.
Inventors
- 👤 David E. Laycock
- 👤 Robert A. Sewell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:36
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4866; C08G18/4829; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2651
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
115 words
A process for preparing a polyether polyol having an equivalent weight of from about 800 to about 4000 by reacting an initiator containing at least three active hydrogen atoms per molecule with an alkylene oxide comprising propylene oxide or butylene oxide in the presence of a catalyst and a processing aid wherein the catalyst is barium, strontium; an oxide, hydroxide, hydrated hydroxide or monohydroxide salt, of barium or strontium; or mixture thereof; and the processing aid has a molecular weight of at least 30 and is an organic monohydroxyl- or dihydroxyl-containing substance or mixture thereof, the processing aid being present in from about 1 to about 10 weight percent based on total weight of initiator.
Claim 2
Dependent Claim
115 words
A process for preparing a polyether polyol having an equivalent weight of from about 800 to about 4000 by reacting an initiator containing at least three active hydrogen atoms per molecule with an alkylene oxide comprising propylene oxide or butylene oxide in the presence of a catalyst and a processing aid wherein the catalyst is barium, strontium; an oxide, hydroxide, hydrated hydroxide or monohydroxide salt, of barium or strontium; or mixture thereof; and the processing aid has a molecular weight of at least 30 and is an organic monohydroxyl- or dihydroxyl-containing substance or mixture thereof, the processing aid being present in from about 1 to about 10 weight percent based on total weight of initiator.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the processing aid is a monohydroxyl-containing substance.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein the monohydroxyl-containing substance is a C 1-6 alcohol.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein the C 1-6 alcohol comprises ethanol, propanol or butanol.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the processing aid is ethanol.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the processing aid is a dihydroxyl-containing substance.
Claim 8
Dependent Claim
20 words
The process of claim 6 wherein the dihydroxyl-containing substance is an aliphatic diol, a dihydroxyl-terminated ether or a dihydroxyl-terminated polyether.
Claim 9
Dependent Claim
13 words
The process of claim 7 wherein the aliphatic diol comprises 1,4-butandiol or 2,3-butandiol.
Claim 10
Dependent Claim
13 words
The process of claim 7 wherein the dihydroxyl-terminated ether comprises di(2-hydroxyethyl)ether or di(2-hydroxypropyl)ether.
Claim 11
Dependent Claim
32 words
The process of claim 7 wherein the dihydroxyl-terminated polyether has a molecular weight of from about 150 to about 600 and comprises a poly(oxyethylene) diol, a poly(oxypropylene) diol or a poly(oxyethylene-oxypropylene) diol.
Claim 12
Dependent Claim
18 words
The process of claim 1 wherein the processing aid is a polyoxyethylene diol of about 200 molecular weight.
Claim 13
Dependent Claim
14 words
The process of claim 1 wherein the alkylene oxides consists essentially of propylene oxide.
Claim 14
Dependent Claim
26 words
The process of claim 1 wherein the catalyst is present in from about 0.01 to about 50 weight percent based on total weight of the initiator.
Claim 15
Dependent Claim
16 words
The process of claim 13 wherein the catalyst is barium hydroxide or a hydrated barium hydroxide.
Claim 16
Dependent Claim
16 words
The process of claim 13 wherein the catalyst is strontium hydroxide or a hydrated strontium hydroxide.
Claim 17
Dependent Claim
17 words
The process of claim 1 wherein the initiator contains from 3 to about 6 active hydrogen atoms/molecule.
Claim 18
Dependent Claim
27 words
The process of claim 16 wherein the initiator comprises glycerine, trimethylolpropane, methylglucoside, beta-(2-hydroxyethyl)glucoside, sorbitol, or oxyalkylene adducts thereof having an equivalent weight of up to about 500.
Claim 19
Dependent Claim
129 words
A process for preparing a polyether polyol having an equivalent weight of from about 800 to about 250 by reacting an initiator which comprises glycerine, trimethylolpropane, methylglucoside, beta-(2-hydroxyethyl)glucoside, sorbitol, or oxyalkylene adducts thereof having an equivalent weight of up to about 500 with propylene oxide in the presence of: i) from about 0.01 to about 50 weight percent based on total weight of the initiator of barium, strontium; an oxide, hydroxide, hydrated hydroxide or monohydroxide salt, of barium or strontium; or mixture thereof; and ii) a processing aid, present in from about 1 to about 10 weight percent based on total weight of initiator, comprising ethanol or a poly(oxyethylene) diol, a poly(oxypropylene) diol or a poly(oxyethylene-oxypropylene) diol which has a molecular weight of from about 150 to about 600.
Claim 20
Dependent Claim
129 words
A process for preparing a polyether polyol having an equivalent weight of from about 800 to about 250 by reacting an initiator which comprises glycerine, trimethylolpropane, methylglucoside, beta-(2-hydroxyethyl)glucoside, sorbitol, or oxyalkylene adducts thereof having an equivalent weight of up to about 500 with propylene oxide in the presence of: i) from about 0.01 to about 50 weight percent based on total weight of the initiator of barium, strontium; an oxide, hydroxide, hydrated hydroxide or monohydroxide salt, of barium or strontium; or mixture thereof; and ii) a processing aid, present in from about 1 to about 10 weight percent based on total weight of initiator, comprising ethanol or a poly(oxyethylene) diol, a poly(oxypropylene) diol or a poly(oxyethylene-oxypropylene) diol which has a molecular weight of from about 150 to about 600.
Claim 21
Dependent Claim
10 words
A polyol produced according to the process of claim 1.
Claim 22
Dependent Claim
22 words
A polymer containing urethane linkages prepared by reacting an organic isocyanate with a polyol obtained according to the process of claim 1.
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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) | 1997-12-19 | 1998-06-20 | 1998-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-19 | 2002-06-20 | 2002-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-19 | 2006-06-20 | 2006-12-20 | $7700.00 | Window Closed / Lapsed |