US5496894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low viscosity polymer polyols with improved dispersion stability
Assignee: Lyondell Chemical Technology LP
•
Filing: 1994-06-10
•
Granted: 1996-03-05
•
Expires: 2014-06-10
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
2026-11-01 23:15
CPC Classifications
C; C08; C08F; C08F283/00; C08F291/00; C08F291/06; C08F291/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
114 words
A stable, low viscosity polymer polyol produced by a method 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 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 weight percent of said total monomer proportion; and (c) any balance of said base polyol proportion.
Claim 2
Dependent Claim
114 words
A stable, low viscosity polymer polyol produced by a method 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 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 weight percent of said total monomer proportion; and (c) any balance of said base polyol proportion.
Claim 3
Dependent Claim
30 words
The polymer polyol of claim 1 wherein said first feed further comprises one or more components selected from the group consisting of a precursor stabilizer and a polymer control agent.
Claim 4
Dependent Claim
30 words
The polymer polyol 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
31 words
The polymer polyol 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 6
Dependent Claim
31 words
The polymer polyol of claim 3 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 7
Dependent Claim
36 words
The polymer polyol of claim 1 wherein said first feed comprises (a) less than about 33 wt. % of said total monomer proportion, dispersed in (b) at least about 50 wt. % of said base polyol.
Claim 8
Dependent Claim
36 words
The polymer polyol of claim 2 wherein said first feed comprises (a) less than about 33 wt. % of said total monomer proportion, dispersed in (b) at least about 50 wt. % of said base polyol.
Claim 9
Dependent Claim
37 words
The polymer polyol of claim 3 wherein said first feed comprises (a) from less than about 33 wt. % of said total monomer proportion, dispersed in (b) at least about 50 wt. % of said base polyol.
Claim 10
Dependent Claim
27 words
The polymer polyol 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 11
Dependent Claim
27 words
The polymer polyol 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 12
Dependent Claim
27 words
The polymer polyol 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 13
Dependent Claim
27 words
The polymer polyol 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 14
Dependent Claim
27 words
The polymer polyol 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 15
Dependent Claim
27 words
The polymer polyol of claim 6 wherein said monomer comprises a mixture of greater than about 50:50 wt. % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile.
Claim 16
Dependent Claim
27 words
The polymer polyol of claim 7 wherein said monomer comprises a mixture of greater than about 50:50 wt. % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile.
Claim 17
Dependent Claim
27 words
The polymer polyol of claim 8 wherein said monomer comprises a mixture of greater than about 50:50 wt. % styrene to an ethylenically unsaturated comonomer comprising acrylonitrile.
Claim 18
Dependent Claim
169 words
A polymer polyol produced by a method 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 a total monomer proportion comprising a mixture of greater than about 50:50 wt. % styrene to one or more ethylenically unsaturated comonomers, at least one of which comprises acrylonitrile; (b) in at least about 50 wt. % of a base polyol; and (c) one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent; and (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) one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent.
Claim 19
Dependent Claim
169 words
A polymer polyol produced by a method 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 a total monomer proportion comprising a mixture of greater than about 50:50 wt. % styrene to one or more ethylenically unsaturated comonomers, at least one of which comprises acrylonitrile; (b) in at least about 50 wt. % of a base polyol; and (c) one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent; and (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) one or more component selected from the group consisting of a precursor stabilizer and a polymer control agent.
Claim 20
Dependent Claim
31 words
The polymer polyol of claim 17 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 21
Dependent Claim
21 words
The polymer polyol of claim 1 wherein said polymer polyol has substantially smaller particle sizes than polymer polyols having equivalent viscosity.
Claim 22
Dependent Claim
21 words
The polymer polyol of claim 17 wherein said polymer polyol has substantially smaller particle sizes than polymer polyols having equivalent viscosity.
References Cited (Backward Citations)
USRE29118E
Cited
USRE28715E
Cited
US4208314A
Cited
US4148840A
Cited
US4242249A
Cited
US4652589A
Cited
US4837246A
Cited
US4837247A
Cited
EP0365986A2
Cited
US5223570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |