Claims
- 1. 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.
- 2. 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.
- 3. 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.
- 4. 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.
- 5. 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.
- 6. 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.
- 7. 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.
- 8. 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.
- 9. 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.
- 10. 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.
- 11. 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.
- 12. 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.
- 13. 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.
- 14. 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.
- 15. 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.
- 16. 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.
- 17. 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.
- 18. 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.
- 19. The polymer polyol of claim 1 wherein said polymer polyol has substantially smaller particle sizes than polymer polyols having equivalent viscosity.
- 20. The polymer polyol of claim 17 wherein said polymer polyol has substantially smaller particle sizes than polymer polyols having equivalent viscosity.
Parent Case Info
This is a division of application Ser. No. 08/109,777, filed Aug. 20, 1993 U.S. Pat. No. 5,364,906.
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
365986 |
May 1990 |
EPX |
Non-Patent Literature Citations (1)
Entry |
CA Selects: Synthetic High Polymers, 1988, Issue 11, p. 11. |
Divisions (1)
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Number |
Date |
Country |
Parent |
109777 |
Aug 1993 |
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