Stabilizers for preparing polymer polyols, and process for preparing polymer polyols
AssigneeThe Dow Chemical Company
InventorsDouglas R. Moore, Keith R. Plowman, Paul L. Neill
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Abstract
A polymer polyol is prepared by polymerizing one or more ethylenically unsaturated monomers in a polyol. A high molecular weight stabilizer having polymerizable ethylenic unsaturation and a low hydroxyl functionality is used, which leads to improved dispersion stability at reduced stabilizer level.
Claims13
A process for preparing a polymer polyol in which at least one ethylenically unsaturated monomer is polymerized in a continuous polyol phase in the presence of an effective amount of a stabilizer to form a dispersion of particles of a polymer of the ethylenically unsaturated monomer in the continuous polyol phase, characterized in that the stabilizer is a polymer having a terminal polymerizable ethylenic unsaturation;
- a number average molecular weight of from about 6,000 to about 100,000;
- an average hydroxyl functionality of up to about 1.0 hydroxyl group/molecule;
- and is prepared from a low molecular weight diol, a difunctional coupling agent and a capping agent, wherein the stabilizer is present in a concentration of from about 0.1 to about 10 percent of the weight of the polymer polyol.
In a process for preparing a polymer polyol wherein at least one ethylenically unsaturated monomer is polymerized in the presence of an effective amount of a conventional stabilizer to form a dispersion of particles in the continuous polyol phase and wherein the stabilizer is a partially capped triol, the improvement comprising substituting a more efficient stabilizer for the conventional stabilizer, the more efficient stabilizer being a stabilizer prepared from a formulation including a low molecular weight diol, a difunctional coupling agent and a capping agent;
- and wherein the stabilizer is a polymer having:
- terminal polymerizable ethylenically unsaturation;
- an average molecular weight of from about 6,000 to about 100,000;
- an average hydroxyl functionality of up to about 1.0 hydroxyl groups per molecule;
- and is present at a from about 0.1 to about 10 percent of the weight of the polymer polyol.
Dependencies are inferred from the claim text.