Processes for producing polycarbonate polyols

Details Processes for producing polycarbonate polyols Processes for producing polycarbonate polyols

1988-06-22

1990-01-02

Pertilla, Theodore E.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

528368, 528481, 528 85, 528499, 528500, 528501, C08G 6362

Patent

active

048914215

ABSTRACT:
A process for producing a polycarbonate polyol by ester-interchange reaction of a dialkyl, diaryl or alkylene carbonate and a polyhydroxy compound, wherein the dialkyl, diaryl or alkylene carbonate is purified by adsorption treatment with an adsorbent prior to use in the reaction. A process for producing a polycarbonate polyol which comprises ester-interchange reaction of a dialkyl or diaryl carbonate and a polyhydroxy compound in the presence of a catalyst, wherein the proportion of the polyhydroxy compound to the dialkyl or diaryl carbonate is 1.01 to 1.30 times its stoichiometrical amount, and the amount of the catalyst is 0.0001 to 0.5% by weight, calculated as metal, based on the dialkyl or diaryl carbonate. Also provided is a process for producing a polycarbonate polyol by ester-interchange reaction of a dialkyl, diaryl or alkylene carbonate and a polyhydroxy compound in the presence of a catalyst in an amount, as metal, of 0.0001 to 0.5% by weight based on the dialkyl, diaryl or alkylene carbonate, which comprises a first step of reacting the dialkyl, diaryl or alkylene carbonate with the polyhydroxy compound, a second step of treating the resulting product with water at 60 to 300.degree. C. to inactivate the catalyst, and a third step of removing water.

REFERENCES:
patent: 4131731 (1978-12-01), Lai et al.

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