Process for the preparation of aliphatic diol polycarbonates

Details Process for the preparation of aliphatic diol polycarbonates Process for the preparation of aliphatic diol polycarbonates

1974-09-24

1976-06-29

Brust, Joseph Paul

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 6800

Patent

active

039667880

ABSTRACT:
Hydroxy-telechelating oligomers of number average molecular weight 250 to 2,500 and containing carbonate groups, are prepared by first polycondensing a bis-chloroformate with a diol at a temperature below 150.degree.C and at a moderately reduced pressure while flushing the reaction mixture with an inert anhydrous gas, and then the oligomers formed are dissolved in a volatile, water-immiscible organic solvent and the solution washed with an aqueous base solution.
In this way, oligomers may be prepared which have a low or zero sensitivity to water, are non-acidic and relatively inexpensive.

REFERENCES:
patent: 2808371 (1957-10-01), Stevens
patent: 3046255 (1962-07-01), Strain et al.
patent: 3366708 (1968-01-01), Magnusson et al.
patent: 3544656 (1970-12-01), Hornung et al.
patent: 3544657 (1970-12-01), Schutze et al.
patent: 3631200 (1971-12-01), Nehring et al.

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