ACTIVE POLYMER POLYOLS AND A PROCESS FOR THEIR PRODUCTION

摘要

Polymer polyols having a solids content of greater than 40 wt. %, a total ethylene oxide content of up to 25 wt. %, and a viscosity at 25° C. of less than 15,000 centistokes are produced by reacting (1) a base polyol having active hydrogen atoms with an ethylene oxide content of from 15 to 40 wt. % that has been formed in the presence of a double metal cyanide (DMC) catalyst, (2) one or more unsaturated monomers, (3) at least one radical initiator, optionally (4) a preformed stabilizer and optionally (5) a chain transfer agent. These polymer polyols (PMPOs) are useful in the preparation of polyurethane foams and elastomers.

主权项

1. A polymer polyol having a solids content of greater than 40% by weight, a total ethylene oxide content of up to 25%, an ethylene oxide content of up to 40% in the base polyol, and a viscosity at 25° C. of less than 15,000 centistokes comprising a reaction product of
a) at least one base polyol containing active hydrogen atoms having a molecular weight of less than 3500 and a total ethylene oxide content of from 15 to 40 formed in the presence of a DMC catalyst, b) at least one unsaturated monomer in an amount such that the polymer polyol will have a solids content of from 40 to 60 wt. %, and, optionally c) a preformed stabilizer formed in the presence of; d) at least one radical initiator, and optionally e) a chain transfer agent