US4141852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stabilizing a mixture of low and high molecular weight polyethers
Assignee: Goodyear Tire and Rubber Co
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Filing: 1977-08-15
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Granted: 1979-02-27
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Expires: 1997-08-15
Abstract
Abstract A mixture of low and high molecular weight polyether polyols are stabilized by including in the mixture one to 10 percent by weight of a grafted polypropylene ether polyol of 2-4 hydroxyls having a molecular weight of 1500 to 3500 where the graft monomer is acrylonitrile or acrylonitrile styrene.
Inventors
- 👤 James M. Hogan
- 👤 John R. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:25
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08F; C08F283/00; C08F283/06; C08G18/6552; C08L; C08L71/00; C08L71/02; C08G2130/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
A method of stabilizing a mixture of a monomeric polyol of less than 500 molecular weight and a polyether polyol of 1800 to 7000 molecular weight against gravity separation, comprising adding one to ten percent by weight of grafted polypropylene ether polyol of two to four hydroxyls of 1500 to 3500 molecular weight to said mixture, said grafted polypropylene ether polyol containing less than 30 percent by weight of a grafting monomer of acrylonitrile or acrylonitrile and styrene.
Claim 2
Independent Claim
78 words
A method of stabilizing a mixture of a monomeric polyol of less than 500 molecular weight and a polyether polyol of 1800 to 7000 molecular weight against gravity separation, comprising adding one to ten percent by weight of grafted polypropylene ether polyol of two to four hydroxyls of 1500 to 3500 molecular weight to said mixture, said grafted polypropylene ether polyol containing less than 30 percent by weight of a grafting monomer of acrylonitrile or acrylonitrile and styrene.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the monomeric polyol is diethanol carbamate.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the mixture contains a mol of polyether polyol and 0.5 to 0.95 mols of the monomeric polyol.
Claim 5
Dependent Claim
15 words
The method of claim 3 wherein the polyols are polypropylene ether polyol and diethanol carbamate.
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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |