Process for the preparation of aliphatic polycarbonates and poly

Details Process for the preparation of aliphatic polycarbonates and poly Process for the preparation of aliphatic polycarbonates and poly

1977-03-17

1978-08-08

Cockeram, H.S.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

528370, 528371, 528 85, C08G 1844, C08G 1808

Patent

active

041056418

ABSTRACT:
The present invention relates to a process for the preparation of polycarbonates which contain aliphatically bound hydroxyl groups by transesterification of aliphatic dihydroxy compounds with glycol carbonate, optionally in the presence of transesterification catalysts, with simultaneous separation of the glycol by fractional distillation, which process is characterized in that ethylene glycol is removed from the reaction mixture as an azeotropic mixture by means of inert solvents with which ethylene glycol is substantially immiscible. The present invention further relates to the preparation of polyurethanes from these polycarbonates.

REFERENCES:
patent: 3023183 (1962-02-01), Nelson
patent: 3133113 (1964-05-01), Malkemus
patent: 3325428 (1967-06-01), Graver et al.
patent: 3639354 (1972-02-01), Mueller et al.
International Critical Tables of Numerical Data, Physics, Chemistry-Technology, vol. 3, pp. 318-324(1928).
Houben-Weyl, Methods of Organic Chemistry, 4th Ed., vol. I/2, p. 879.
Handbook of Chemistry & Physics, 53rd Edition, Chemical Rubber Co., Cleveland (1972-1973), pp. D-10, -14, -24, -25.
Beilstein vol. I, Supp. vol. 3, pp. 2057-2059.
DOS 1495299, Chemische Werke Huls (Springmann et al., Jan. 2, 1969.

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