High molecular weight dispersants for polymer polyols

Details High molecular weight dispersants for polymer polyols High molecular weight dispersants for polymer polyols

1988-05-24

1989-06-06

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

524714, 524732, 524757, 525185, C08G 1814

Patent

active

048372463

ABSTRACT:
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.

REFERENCES:
patent: 3953393 (1976-04-01), Ramlow et al.
patent: 4119586 (1978-10-01), Shah
patent: 4458038 (1984-07-01), Ramlow et al.

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