US5728745A
Expired / Lapsed
US
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Polyurethane elastomers having improved green strength and demold time, and polyoxyalkylene polyols suitable for their preparation
Assignee: Lyondell Chemical Technology LP
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Filing: 1996-12-19
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Granted: 1998-03-17
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Expires: 2016-12-19
Abstract
Abstract Elastomers exhibiting decreased demold times and improved green strength are prepared by reacting a di- or polyisocyanate with a monodisperse polyoxypropylene diol having ultra-low unsaturation, and preferably prepared by the double metal cyanide.t-butyl alcohol catalyzed polymerization of propylene oxide. Further improved demold times and elevated elastomer physical properties are made possible bythe use of multidisperse polyoxyalkylene polyether polyol blends having an overall unsaturation of less than 0.010 meq/g and a polydispersity of about 1.4 or greater.
Inventors
- 👤 Gary L. Allen
- 👤 Nigel Barksby
- 👤 Stephen D. Seneker
- 👤 Usama E. Younes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:25
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2663; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C07; C07C; C07C271/00; C07C271/06; C07C271/08; C08G18/08; C08G18/10; C08G18/12; C08G18/4804; C08G18/4808; C08G18/4825; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/4866; C08G18/67; C08L; C08L71/00; C08L71/02; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0066; C08G2110/0083; C08G2410/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
101 words
A one-shot polyurethane microcellular elastomer prepared by the reaction of a di- or polyisocyanate in the presence of from about 0.1 to about 1.0 weight percent water with an isocyanate reactive component comprising a polyol component, wherein said polyol component comprises one or more polyoxypropylene polyols, said polyoxyalkylene polyols comprising in excess of 50 weight percent, based on the total weight of said one or more polyoxypropylene polyols, of one or more polyoxypropylene diols having an unsaturation of less than 0.010 meq/g, said polyol component having an average unsaturation of less than 0.010 meq/g, and optionally one or more polymer polyols.
Claim 2
Dependent Claim
101 words
A one-shot polyurethane microcellular elastomer prepared by the reaction of a di- or polyisocyanate in the presence of from about 0.1 to about 1.0 weight percent water with an isocyanate reactive component comprising a polyol component, wherein said polyol component comprises one or more polyoxypropylene polyols, said polyoxyalkylene polyols comprising in excess of 50 weight percent, based on the total weight of said one or more polyoxypropylene polyols, of one or more polyoxypropylene diols having an unsaturation of less than 0.010 meq/g, said polyol component having an average unsaturation of less than 0.010 meq/g, and optionally one or more polymer polyols.
Claim 3
Dependent Claim
22 words
The microcellular elastomer of claim 1 wherein said one or more polyoxypropylene diols together have a polydispersity of about 1.4 or greater.
Claim 4
Dependent Claim
22 words
The microcellular elastomer of claim 1 wherein at least one of said one or more polyoxypropylene polyols is a polyoxypropylene/polyoxyethylene copolymer polyol.
Claim 5
Dependent Claim
40 words
The elastomer of claim 3 wherein at least a portion of said polyoxyethylene moieties are present as a cap in amounts of from about 5 weight percent to about 20 weight percent based on the weight of the polyoxypropylene/polyoxyethylene polyol.
Claim 6
Dependent Claim
37 words
The microcellular elastomer of claim 1 wherein said elastomer has reduced compression set as compared to an elastomer prepared from an identical formulation but having a polyol component having an average unsaturation of 0.010 meq/g or higher.
Claim 7
Dependent Claim
10 words
A shoe sole comprising the microcellular elastomer of claim 5.
Claim 8
Dependent Claim
13 words
The shoe sole of claim 6 wherein said microcellular elastomer comprises a midsole.
Claim 9
Dependent Claim
36 words
The microcellular elastomer of claim 1 wherein said elastomer has reduced shrinkage as compared to an elastomer prepared from an identical formulation but having a polyol component having an average unsaturation of 0.010 meq/g or higher.
Claim 10
Dependent Claim
10 words
A shoe sole comprising the microcellular elastomer of claim 8.
Claim 11
Dependent Claim
13 words
The shoe sole of claim 9 wherein said microcellular elastomer comprises a midsole.
Claim 12
Dependent Claim
88 words
A microcellular polyurethane elastomer which comprises the reaction product of: (a) a prepolymer prepared by the reaction of an excess of di- or polyisocyanate with a monodisperse polyoxypropylene diol having a molecular weight of from 1000 Da to about 20,000 Da, a polydispersity of about 1.20 or less, and an unsaturation of less than about 0.008 meq/g; with (b) a glycol chain extender; wherein the microcellular polyurethane elastomer exhibits a demold time of 60 minutes or less, and has a density of about 0.80 g/cm 3 or less.
Claim 13
Dependent Claim
88 words
A microcellular polyurethane elastomer which comprises the reaction product of: (a) a prepolymer prepared by the reaction of an excess of di- or polyisocyanate with a monodisperse polyoxypropylene diol having a molecular weight of from 1000 Da to about 20,000 Da, a polydispersity of about 1.20 or less, and an unsaturation of less than about 0.008 meq/g; with (b) a glycol chain extender; wherein the microcellular polyurethane elastomer exhibits a demold time of 60 minutes or less, and has a density of about 0.80 g/cm 3 or less.
Claim 14
Dependent Claim
37 words
The microcellular elastomer of claim 11 wherein said elastomer has reduced compression set as compared to an elastomer prepared from an identical formulation but having a polyol component having an average unsaturation of 0.010 meq/g or higher.
Claim 15
Dependent Claim
10 words
A shoe sole comprising the microcellular elastomer of claim 12.
Claim 16
Dependent Claim
13 words
The shoe sole of claim 13 wherein said microcellular elastomer comprises a midsole.
Claim 17
Dependent Claim
36 words
The microcellular elastomer of claim 11 wherein said elastomer has reduced shrinkage as compared to an elastomer prepared from an identical formulation but having a polyol component having an average unsaturation of 0.010 meq/g or higher.
Claim 18
Dependent Claim
10 words
A shoe sole comprising the microcellular elastomer of claim 15.
Claim 19
Dependent Claim
13 words
The shoe sole of claim 16 wherein said microcellular elastomer comprises a midsole.
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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) | 2001-03-16 | 2001-09-15 | 2002-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-16 | 2005-09-15 | 2006-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-16 | 2009-09-15 | 2010-03-17 | $7700.00 | Window Closed / Lapsed |