Process for preparing polycarbonate-polyether-blockcopolymers

Details Process for preparing polycarbonate-polyether-blockcopolymers Process for preparing polycarbonate-polyether-blockcopolymers

1980-08-11

1984-03-13

Cockeram, H. S.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521180, 528196, 528199, C08G 1844, C08G 6368, C08J 928

Patent

active

044368399

ABSTRACT:
A method for production of polycarbonate-polyether-blockcopolymers is provided. One or more solutions comprising bisphenol A and polyalkyleneglycol and a phosgene solution are added to a cooled initial reaction medium in a cooled reaction chamber in such a way that the phosgene contacts substantially the reaction partners from the one or more cooled solutions after they have spread in the reaction medium. Preferably the phosgene solution and the one or more solutions are added through tubes ending above the liquid level of the reaction medium such that the solutions added contact only within the stirred reaction mixture the reaction partner. The phosgene is employed in an excess of less than about 10 weight percent of the stochiometrically required weight amount relative to bisphenol A and polyalkyleneglycol. The polymer is useful in the production of membranes for dialysis, ultrafiltration and reverse osmosis.

REFERENCES:
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patent: 3787359 (1974-01-01), Horn et al.
patent: 3945969 (1976-03-01), Horn et al.
patent: 3974126 (1976-08-01), Narita et al.
patent: 4160791 (1979-07-01), Higley et al.
patent: 4205162 (1980-05-01), Herscovici
patent: 4212967 (1980-07-01), Govoni et al.
patent: 4252968 (1981-02-01), Govoni et al.
Goldberg, J. of Polymer Science, Part C, No. 4, pp. 707-730.
Webster's New World Dictionary, College Edition, New York, 1966, p. 1411.

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