Coagulation of polymers using sulfurous acid

Details Coagulation of polymers using sulfurous acid Coagulation of polymers using sulfurous acid

1996-06-14

1998-12-15

Lipman, Bernard

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

515310, 515311, C08K 700

Patent

active

058498362

ABSTRACT:
Methods for coagulating a graft polymer latex comprise contacting the latex with sulfurous acid. The methods are particularly suitable for ABS resins and provide products having improved thermal oxidative stability and color stability. When coagulation is effected in the presence of a radical initiator, the residual grafting monomer concentration in the resin product is reduced.

REFERENCES:
patent: 4487857 (1984-12-01), Sugimori et al.
patent: 4602064 (1986-07-01), Moore et al.
patent: 4783508 (1988-11-01), Moore et al.
Homogeneous and Heterogeneous Copolymerization of Styrene and Sulfur Dioxide using the (CH.sub.3) .sub.3 COOH/SO.sub.2 Redox System, Journal of Applied Polymer Science, vol. 37, 3163-3176 (1989), SK. A. Ali, C.P. Tsonis and M.I.M. Wazeer.

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