Polycarbonate redistribution method employing phosphonium hydrox

Details Polycarbonate redistribution method employing phosphonium hydrox Polycarbonate redistribution method employing phosphonium hydrox

1995-11-20

1996-10-22

Seidleck, James J.

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

Synthetic resins

Treating polymer containing material or treating a solid...

525462, 525469, 528196, 528485, 528486, 528488, 528490, 528491, 528492, 528502C, C08F 600

Patent

active

055678025

ABSTRACT:
Polycarbonate compositions are redistributed by melt equilibration using as the redistribution catalyst a tetraorganophosphonium hydroxide, preferably a tetra-(C.sub.1-6 alkyl)phosphonium hydroxide. Such catalysts have numerous advantages including greater redistribution efficiency, decreased color in the redistributed product and the capability of employment in the anhydrous state.

REFERENCES:
patent: 5412061 (1995-05-01), King Jr. et al.
patent: 5414057 (1995-05-01), Campbell et al.
patent: 5459226 (1995-10-01), King Jr. et al.

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