Patent US5364906A successfully refreshed from Google Patents.
US5364906A
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Low viscosity polymer polyols with improved dispersion stability
Assignee: Lyondell Chemical Technology LP
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Filing: 1993-08-20
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Granted: 1994-11-15
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Expires: 2013-08-20
Abstract
Abstract The present invention provides polymer polyols and a method for preparing polymer polyols which have (1) exceptional dispersion stability, especially at high styrene contents, and (2) substantially smaller particle sizes than polymer polyols having equivalent viscosity. In a preferred embodiment of the present invention, a first reaction product is obtained by feeding the following materials to a first continuous reactor in the presence of a free radical initiator or catalyst: (a) less than about 50 wt % of a total monomer proportion or monomer mixture, preferably comprising styrene/acrylonitrile at a ratio preferably greater than about 50/50 wt %; (b) at least about 50 wt % of a total base polyol proportion; (c) a majority of a precursor stabilizer; and, (d) a polymer control agent (PCA). The product from this first reaction then is again fed through a continuous reactor, which may be the same as the first reactor, along with additional initiator, at least about 50% of the total monomer proportion, and, optionally, any balance of the total base polyol proportion, precursor stabilizer, and PCA. The product from this second reactor is a high stability, low viscosity polymer polyol.
Inventors
- 👤 Frank E. Critchfield
- 👤 Donald W. Simroth
- 👤 Stuart L. Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:34
CPC Classifications
C; C08; C08F; C08F283/00; C08F291/00; C08F291/06; C08F291/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
115 words
A method for producing a stable, low viscosity polymer polyol comprising the steps of (1) producing a first reaction product by polymerizing a first feed in a first continuous reactor in the presence of an initiator, said first feed comprising less than about 50 wt % of a total monomer proportion in at least about 50 wt % of a total base polyol proportion; (2) producing a second reaction product by polymerizing a second feed in a continuous reactor in the presence of an initiator, said second feed comprising: (a) said first reaction product; (b) at least about 50 wt % of said total monomer proportion; and (c) any balance of said base polyol proportion.
Claim 2
Independent Claim
115 words
A method for producing a stable, low viscosity polymer polyol comprising the steps of (1) producing a first reaction product by polymerizing a first feed in a first continuous reactor in the presence of an initiator, said first feed comprising less than about 50 wt % of a total monomer proportion in at least about 50 wt % of a total base polyol proportion; (2) producing a second reaction product by polymerizing a second feed in a continuous reactor in the presence of an initiator, said second feed comprising: (a) said first reaction product; (b) at least about 50 wt % of said total monomer proportion; and (c) any balance of said base polyol proportion.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said first feed further comprises one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent.
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein said second feed further comprises one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein said first feed comprises (a) from less than about 33 wt % of said total monomer proportion in (b) at least about 50 wt % of said base polyol.
Claim 6
Dependent Claim
35 words
The method of claim 3 wherein said first feed comprises (a) from less than about 33 wt % of said total monomer proportion in (b) at least about 50 wt % of said base polyol.
Claim 7
Dependent Claim
26 words
The method of claim 1 wherein said monomer comprises a mixture of greater than about 50:50 wt % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile.
Claim 8
Dependent Claim
26 words
The method of claim 2 wherein said monomer comprises a mixture of greater than about 50:50 wt % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile.
Claim 9
Dependent Claim
26 words
The method of claim 3 wherein said monomer comprises a mixture of greater than about 50:50 wt % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile.
Claim 10
Dependent Claim
26 words
The method of claim 4 wherein said monomer comprises a mixture of greater than about 50:50 wt % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile.
Claim 11
Dependent Claim
26 words
The method of claim 5 wherein said monomer comprises a mixture of greater than about 50:50 wt % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile.
Claim 12
Dependent Claim
30 words
The method of claim 2 wherein said precursor stabilizer is an adduct of an unsaturated compound with a polyol, and wherein said stabilizer contains unsaturation that copolymerizes with said monomer.
Claim 13
Dependent Claim
30 words
The method of claim 5 wherein said precursor stabilizer is an adduct of an unsaturated compound with a polyol, and wherein said stabilizer contains unsaturation that copolymerizes with said monomer.
Claim 14
Dependent Claim
30 words
The method of claim 10 wherein said precursor stabilizer is an adduct of an unsaturated compound with a polyol, and wherein said stabilizer contains unsaturation that copolymerizes with said monomer.
Claim 15
Independent Claim
173 words
A method for producing a stable, low viscosity polymer polyol comprising the steps of (1) producing a first reaction product by polymerizing a first feed in a first continuous reactor in the presence of an initiator, said first feed comprising: (a) less than about 50 wt % of total monomer proportion comprising a mixture of greater than about 50:50 wt % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile; (b) in at least about 50 wt % of a total base polyol proportion; and, (c) one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent; (2) producing a second reaction product by polymerizing a second feed in a continuous reactor in the presence of an initiator, said second feed comprising: (a) said first reaction product; (b) at least about 50 wt % of said total monomer proportion; (c) any balance of said base polyol proportion; and, (c) one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent.
Claim 16
Independent Claim
173 words
A method for producing a stable, low viscosity polymer polyol comprising the steps of (1) producing a first reaction product by polymerizing a first feed in a first continuous reactor in the presence of an initiator, said first feed comprising: (a) less than about 50 wt % of total monomer proportion comprising a mixture of greater than about 50:50 wt % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile; (b) in at least about 50 wt % of a total base polyol proportion; and, (c) one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent; (2) producing a second reaction product by polymerizing a second feed in a continuous reactor in the presence of an initiator, said second feed comprising: (a) said first reaction product; (b) at least about 50 wt % of said total monomer proportion; (c) any balance of said base polyol proportion; and, (c) one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent.
Claim 17
Dependent Claim
30 words
The method of claim 14 wherein said precursor stabilizer is an adduct of an unsaturated compound with a polyol, and wherein said stabilizer contains unsaturation that copolymerizes with said monomer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-11-14 | 1998-05-16 | 1998-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-14 | 2002-05-16 | 2002-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-14 | 2006-05-16 | 2006-11-15 | $7700.00 | Window Closed / Lapsed |