POLYOL MIXTURE PRODUCTION PROCESS Russian patent published in 2007 - IPC C08G65/26 C08G18/48 

FIELD: polymer production.

SUBSTANCE: invention relates to in situ production of mixture from polyethermonool and polyetherpolyol, which comprises following steps: (A) loading a mixture to reactor, which mixture contains (1) initial initiator (S_i) including one or several monofunctional compounds and (2) double metal cyanide catalyst; (B) supplying epoxide including propylene oxide and ethylene oxide to reactor at weight ratio between 100:0 and 10:80; (C) bringing epoxide mixture into interaction with initial initiator (S_i) and performing polymerization of epoxides until equivalent weight of multifunctional compound rises by at least 10 wt % and achieves value from about 1500 to about 6000; (D) continuously adding low molecular weight initiator (S_c) having functionality from 2.0 to 8 and equivalent weight from about 28 to about 400 to reactor while continuing addition of epoxides; (E) ending continuous addition of initiator (S_c); and (F) continuing polymerization of the mixture in reactor until resulting monool/polyol mixture achieves average equivalent weight from about 350 to about 750 and average functionality from about 2 to about 4 and includes (1) about 25 to about 75 wt % polyethermonool having equivalent weight from about 1500 to about 6000 and (2) about 25 to about 75 wt % polyetherpolyol having equivalent weight from about 200 to about 500 and average functionality from about 20 to about 8. In situ produced mixtures of polyethermonool and polyetherpolyol as well as viscous-elastic foam production process are also described.

EFFECT: avoided need of preparation, storage, and mixing of separate polyethers and so reduced requirements for multiple tanks, which enhances production efficiency.

3 cl, 6 dwg, 2 tbl