High molecular weight dispersions for polymer polyols

Details High molecular weight dispersions for polymer polyols High molecular weight dispersions for polymer polyols

C - Chemistry, Metallurgy

08

F

400/105, 402/157

C08F 283/06 (2006.01) C08G 18/63 (2006.01) C08G 65/10 (2006.01)

Patent

CA 1336850

Low viscosity polymer polyol polyols having high styrene/acrylonitrile ratios and good stability may be achieved by the use of a high molecular weight (HMW) dispersant polyol comprising less than 5 wt.% of the total polyol component of the polymer polyol. The HMW dispersant should have a molecular weight higher than about 6000. Preferably, a semi-batch reactor is used, and a relatively high concentration of the HMW dispersant is initially charged to the reactor, relative to the portion of base polyol, which has a molecular weight of less than 4000.

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