Method of manufacturing halogenated aromatic polysulfone compoun

Details Method of manufacturing halogenated aromatic polysulfone compoun Method of manufacturing halogenated aromatic polysulfone compoun

1988-12-07

1991-02-26

Kight, III, John

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525534, 528171, 528174, C08C 7500, C08F28300, C08L 8100

Patent

active

049962710

ABSTRACT:
Halogenation of Udel (trademark) and Radel (trademark) polysulfone occurs adily by electrophilic substitution. The reactive substitution position is situated ortho- to the aryl ether linkage in the Bisphenol-A portion of the repeat units. Halogenated polysulfones are obtained by reaction of the polymer with elemental halogen. Thus, a solution of Udel polysulfone in chloroform, treated with excess bromine at room temperature, gives dibrominated polysulfone III in high yield. The degree of substitution after 18-24 hours is typically 1.80 to 2.05 by bromine analysis. Similar results are obtained by reaction of the polymer with elemental chlorine. Lower degrees of substitution are obtained with shorter reaction times or using lesser amounts of halogen.

REFERENCES:
patent: 4797457 (1989-01-01), Guiver et al.

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