Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1992-03-02
1994-07-12
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528492, 528495, 528499, C08F 614
Patent
active
053289838
ABSTRACT:
The invention relates to a process for the purification of brominated styrenic homo-polymers and co-polymers. The purification process reduces or removes contained aliphatic bromine, and free bromine resulting from the reaction of the brominated reagent with the polystyrene backbone. In addition, the method optionally removes occluded inorganic halide impurities from the polymer. These impurities are considered undesirable due to their adverse effects on thermal aging and stability of the final end use resin formulations.
REFERENCES:
patent: 4503219 (1985-03-01), Reffert et al.
Favstritsky Nicolai A.
Fielding William R.
Sands John L.
Stahl Robert J.
Great Lakes Chemical Corporation
Schofer Joseph L.
Weber Tom
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