Method of preparing high molecular weight poly(alkylene carbonat

Details Method of preparing high molecular weight poly(alkylene carbonat Method of preparing high molecular weight poly(alkylene carbonat

1986-04-11

1987-11-24

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

558262, 558266, 558268, 558269, C07C 6806

Patent

active

047090693

ABSTRACT:
The invention is a process for increasing the molecular weight of a poly(alkylene carbonate) polyahl which comprises exposing the poly(alkylene carbonate) polyahl to elevated temperatures at which dialkylene glycol or initiator segments, wherein the initiator has about the same or greater volatility as the dialkylene glycol segment, are abstracted from the poly(alkylene carbonate), polyahl, at a pressure wherein the dialkylene glycol or initiator is volatile, and removing the volatile dialkylene glycol initiator from the mass of the poly(alkylene carbonate) polyahl, under conditions such that the molecular weight of the poly(alkylene carbonate) polyahl is increased.

REFERENCES:
patent: 3133113 (1964-05-01), Malkemus
patent: 3248414 (1966-04-01), Stevens
patent: 3248415 (1966-04-01), Stevens
patent: 3248416 (1966-04-01), Stevens
patent: 3689462 (1972-09-01), Maximovich

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