| abstract |
(57) Abstract: To provide a continuous production method of a highly stable, fine and low viscosity polymer polyol having a small average particle size. In a first spup, (1) a mixture of styrene and acrylonitrile is added to (4) a radical initiator, (5) in a mixture of (2) polyoxyalkylene polyether polyol and (3) macromer. The macromer is reacted at a temperature of 100 ° C. or higher in the presence of a solvent having a medium chain transfer activity, and optionally (6) a reaction modifier, to give about 12% by weight or more, preferably about 15% by weight, of the macromer of the polyol mixture. %, With a solids content of less than about 30% by weight, preferably less than 25% by weight and about 15% by weight. % Of the intermediate, which then functions as a seed for further polymerization, is added in one or more stirred tank reactors connected in series between the remaining reactors. Is reacted with a mixture of styrene and acrylonitrile in a polyol and optionally in a macromer in the presence of a solvent, an initiator and a reaction modifier distributed in. |