Stopping/restarting free radical polymerizations

Details Stopping/restarting free radical polymerizations Stopping/restarting free radical polymerizations

1982-05-03

1984-02-21

Wong, Jr., Harry

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526296, 5263293, 526330, 526341, 526342, C08F 602, C08F 2044

Patent

active

044331223

ABSTRACT:
A method for stopping and restarting the free-radical polymerization of vinyl monomers (e.g. acrylic monomers) without forming low molecular weight polymer is provided. These polymerizations utilize a Redox catalyst system comprising multivalent metal ions (e.g. iron ions) as promoter. The polymerizations are stopped by chelation of the iron present. Additional monomer is added to the polymerization to avoid formation of low molecular weight polymer. Upon restart metal ions are added to the polymerization mixture.

REFERENCES:
patent: 3681311 (1972-08-01), Patron et al.

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