A polyalkylene glycol derivative with a minimal impurity content is prepared simply by the steps of reacting a compound having formula (III-I) or (III-II) with an electrophile having formula (IV) in the presence of an optional basic compound, to form a reaction solution containing a compound having formula (V), and passing the reaction solution through a column of cation and anion exchange resins to remove water-soluble impurities, for thereby purifying the desired polyalkylene glycol derivative.
R.sup.1R.sup.2OR.sup.3O.sub.n-1R.sup.3O.sup.M.sup.+(III-I)
R.sup.1R.sup.2OR.sup.3O.sub.n-1R.sup.3OH(III-II)
R.sup.4R.sup.5X(IV)
R.sup.1R.sup.2OR.sup.3O.sub.nR.sup.5R.sup.4(V)

A polyalkylene glycol derivative with a minimal impurity content is prepared simply by the steps of reacting a compound having formula (III-I) or (III-II) with an electrophile having formula (IV) in the presence of an optional basic compound, to form a reaction solution containing a compound having formula (V), and passing the reaction solution through a column of cation and anion exchange resins to remove water-soluble impurities, for thereby purifying the desired polyalkylene glycol derivative.
R.sup.1R.sup.2OR.sup.3O.sub.n-1R.sup.3O.sup.M.sup.+(III-I)
R.sup.1R.sup.2OR.sup.3O.sub.n-1R.sup.3OH(III-II)
R.sup.4R.sup.5X(IV)
R.sup.1R.sup.2OR.sup.3O.sub.nR.sup.5R.sup.4(V)

An alkylene oxide mixture containing greater than 50% by weight ethylene oxide is continuously polymerized in the presence of a double metal cyanide polymerization catalyst and an alkoxylated initiator having a hydroxyl equivalent weight of up to 200. The catalyst remains active, producing a polyol having an equivalent weight of up to 700 with a high oxyethylene content continuously at fast reaction rates.

An alkylene oxide mixture containing greater than 50% by weight ethylene oxide is continuously polymerized in the presence of a double metal cyanide polymerization catalyst and an alkoxylated initiator having a hydroxyl equivalent weight of up to 200. The catalyst remains active, producing a polyol having an equivalent weight of up to 700 with a high oxyethylene content continuously at fast reaction rates.

This invention relates to process for preparing low viscosity polyoxyalkylene polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S.sub.i), a H-functional starter substance (S.sub.x) and a H-functional starter substance (S.sub.c) with one or more alkylene oxides in the presence of a double metal cyanide catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of greater than 35 to 115 mg KOH/g polyol.

This invention relates to process for preparing low viscosity polyoxyalkylene polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S.sub.i), a H-functional starter substance (S.sub.x) and a H-functional starter substance (S.sub.c) with one or more alkylene oxides in the presence of a double metal cyanide catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of greater than 35 to 115 mg KOH/g polyol.

This invention relates to process for preparing low viscosity polyoxyalkylene polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S.sub.i), a H-functional starter substance (S.sub.x) and a H-functional starter substance (S.sub.c) with one or more alkylene oxides in the presence of a double metal cyanide catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of greater than 35 to 115 mg KOH/g polyol.

This invention relates to process for preparing low viscosity polyoxyalkylene polyols (P) that have a narrow molecular weight distribution. This process comprises reacting a H-functional starter substance (S.sub.i), a H-functional starter substance (S.sub.x) and a H-functional starter substance (S.sub.c) with one or more alkylene oxides in the presence of a double metal cyanide catalyst. The resultant polyoxyalkylene polyols (P) have a functionality of 2 to 8 and a hydroxyl number of greater than 35 to 115 mg KOH/g polyol.

This invention relates to a semi-batch process for the production of polyoxyalkylene polyether polyols. These polyoxyalkylene polyether polyols have hydroxyl (OH) numbers of from 112 to 400. This process comprises establishing oxyalkylation condition in a reactor in the presence of a DMC catalyst, continuously introducing alkylene oxide and a suitable starter into the reactor, and recovering an oxyalkyated polyether polyol. The oxyalkylation initially occurs at a temperature that is sufficiently high enough to avoid or prevent deactivation of the DMC catalyst, or for from 2% to 50% of the total oxide feed amount, and the oxyalkylation is then continued at a lower temperature.

This invention relates to a semi-batch process for the production of polyoxyalkylene polyether polyols. These polyoxyalkylene polyether polyols have hydroxyl (OH) numbers of from 112 to 400. This process comprises establishing oxyalkylation condition in a reactor in the presence of a DMC catalyst, continuously introducing alkylene oxide and a suitable starter into the reactor, and recovering an oxyalkyated polyether polyol. The oxyalkylation initially occurs at a temperature that is sufficiently high enough to avoid or prevent deactivation of the DMC catalyst, or for from 2% to 50% of the total oxide feed amount, and the oxyalkylation is then continued at a lower temperature.