Stable polymer polyols in base polyols with molecular weight gre

Details Stable polymer polyols in base polyols with molecular weight gre Stable polymer polyols in base polyols with molecular weight gre

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, 523185, C08G 1814

Patent

active

048372471

ABSTRACT:
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.

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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