Stable dispersions in base polyols with molecular weight...

Details Stable dispersions in base polyols with molecular weight... Stable dispersions in base polyols with molecular weight...

C - Chemistry, Metallurgy

08

G

400/105, 402/157

C08G 18/63 (2006.01) C08F 283/06 (2006.01) C08G 65/10 (2006.01) C08J 3/11 (2006.01)

Patent

CA 1336851

Low viscosity polymer polyols having high styrene/acrylonitrile ratios and good stability may be achieved by the use of a base polyol having a molecular weight higher than 4000, for example, from 4000 to 6500 and a high molecular weight (HMW) dispersant. The dispersant polyol may range from 1 to 20 wt.%, but may be 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. Monomer ratios of styrene to acrylonitrile of 85/15 may be achieved with this method.

588535

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