Process for the preparation of polycarbonate polyols

Details Process for the preparation of polycarbonate polyols Process for the preparation of polycarbonate polyols

1983-11-14

1985-08-06

Welsh, Maurice J.

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

Synthetic resins

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

260463, 528372, C08G 6362

Patent

active

045337292

ABSTRACT:
The present invention provides a novel process for preparing specified amorphous polycarbonate polyols. The process comprises reacting phosgene, a branched-chain polyhydric alcohol, and a straight chain polyhydric alcohol in the presence of a solvent and in the absence of a catalyst at a temperature of about 60.degree. to 100.degree. C., and then contacting the amorphous polycarbonate product in the reaction mixture with a catalytic amount of a tertiary amine at reflux temperature for a period of time of at least about 30 minutes. The straight chain polyhydric alcohol is employed in an amount of about 3 to 40 mole percent, based upon the total amount of polyhydric alcohol present in the reaction system. A preferred branched-chain polyhydric alcohol is neopentyl glycol, and a preferred straight chain polyhydric alcohol is 1,6-hexanediol. Preferred solvents are xylene and toluene, and preferred tertiary amines are triethylamine and pyridine.

REFERENCES:
patent: 3379693 (1968-04-01), Hostettler et al.
patent: 4105641 (1978-08-01), Buysch et al.
patent: 4131731 (1978-12-01), Lai et al.
patent: 4365055 (1982-12-01), Madigan

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