Patent ID: 11952454
Assignee: COVESTRO LLC
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A process for preparing a polymer polyol (PMPO), comprising:
a) continuously producing a base polyol having a functionality of 2 to 8 and a hydroxyl number of 10 to 1000 mg KOH/g in a continuous base polyol reactor;
b) continuously discharging the base polyol from the continuous base polyol reactor;
c) continuously introducing to a continuous PMPO reactor, which is different from the continuous base polyol reactor, components comprising:
(1) the base polyol being continuously discharged from the continuous base polyol reactor;
(2) an ethylenically unsaturated monomer,
(3) a preformed stabilizer; and
(4) a free radical initiator, to continuously produce the PMPO; and

d) continuously removing the PMPO from the continuous PMPO reactor,
wherein the base polyol is not prepared in the same reactor as the PMPO.