Process for the polymerization of ethylenically unsaturated mono

Details Process for the polymerization of ethylenically unsaturated mono Process for the polymerization of ethylenically unsaturated mono

1981-01-27

1983-11-15

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263442, 502160, C08K 506

Patent

active

044157169

ABSTRACT:
A process for the polymerization of ethylenically unsaturated monomers wherein a solid, monomer-soluble, free-radical forming compound is used as initiator. The initiator is charged to the polymerization system in the form of an aqueous dispersion comprising an emulsifier combination which consists of an ethoxylated nonionic emulsifier with an HLB-value above 15, which does not contain cyclic inner ether bonds, and a non-ethoxylated nonionic emulsifier with an HLB-value below 9. The emulsifier combination has a resulting HLB-value within the interval 11-17 and the combination is used in an amount of at least 1% by weight based on the initiator. Polymerizates produced according to the method have good electric insulation properties. A means suitable for the polymerization of ethylenically unsaturated monomers consists of an aqueous dispersion of a free-radical forming initiator, which dispersion comprises the mentioned emulsifier combination in an amount of at least 1 percent by weight, based on the initiator. The dispersion preferably also contains a protrective colloid such as polyvinyl alcohol. The dispersions have good stability and are easy to handle.

REFERENCES:
patent: 4039475 (1977-08-01), Oosterwijk et al.
patent: 4092470 (1978-05-01), Oosterwijk et al.
"Pharmaceutical Emulsions and Emulsifying Agents", Lawrence M. Spalton, B. Pharm., London, 1949, pp. 67-80.

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