Process for shortstopping an emulsion polymerization

Details Process for shortstopping an emulsion polymerization Process for shortstopping an emulsion polymerization

1991-06-28

1993-01-05

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 85, 526123, 526335, 526340, 526230, C08F 238

Patent

active

051771640

ABSTRACT:
A process for shortstopping a free radical polymerization of a conjugated diene and optionally a vinyl-substituted aromatic in an aqueous emulsion, using a hydroperoxide as initiator and a redox activator, comprising a divalent transition metal, a reducing agent and optionally being carried out in the presence of a modifier, and being performed by using as sole shortstopping agent an alkali metal polysulphide. This process results in the production of polymeric products which are free of carcinogenic nitrosamines.

REFERENCES:
patent: 2469017 (1949-05-01), Sundet
patent: 2574020 (1951-11-01), Crouch
patent: 2602078 (1952-07-01), Schulze et al.
patent: 2616875 (1952-11-01), Adams et al.
patent: 2662876 (1953-12-01), Antlfinger
patent: 3322736 (1967-05-01), Nudenberg et al.
patent: 3855188 (1974-12-01), Uraneck et al.
patent: 4242477 (1980-12-01), Koski et al.
Industrial and Engineering Chem., vol. 45, No. 1, Jan. 1953, pp. 182-186.
D. C. Blackley, Emulsion Polymerization, Theory and Practice, 1975, pp. 406-417 and 430-435.

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