Two-stage process for the preparation of polycarbonate copolyeth

Details Two-stage process for the preparation of polycarbonate copolyeth Two-stage process for the preparation of polycarbonate copolyeth

1997-03-17

1998-08-18

Mosely, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528176, 528190, 528193, 528194, 528198, C08G 6400

Patent

active

057959528

ABSTRACT:
A process for the preparation of polycarbonate copolyether diols comprising two successive reaction stages wherein in the first stage the precursor, bisdimethylcarbonate of polyether diols is synthesized by reacting, in a reactor equipped with a distillation column, one or more polyetherglycols with dimethyl carbonate, in the presence of a basic catalyst selected from the group consisting of an oxide, a hydroxide, a carbonate and an alcoholate of a metal belonging to the group of alkaline or earth-alkaline metals and in the second stage, the precursor, after being freed from the catalyst and excess dimethylcarbonate, is converted to polycarbonate copolyether diols by transesterification reaction with polyetherglycols in the presence of a solvent and an organometallic catalyst selected from compounds of tin, lead, titanium, zirconium and antimonium, said polycarbonate polyether diols having utility as additives in the field of polyurethane end-products, thermoelastomers, paints and adhesives.

REFERENCES:
patent: 4518766 (1985-05-01), Greco et al.
patent: 4990578 (1991-02-01), Greco et al.
patent: 5116929 (1992-05-01), Greco et al.
patent: 5288839 (1994-02-01), Greco

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