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

1982-07-27

1985-02-12

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526344, 5263442, C08F 432

Patent

active

044992505

ABSTRACT:
A process for the polymerization of ethylenically unsaturated monomers, such as vinyl chloride, wherein a solid, monomer-soluble, free-radical forming compound is used as initiator. The initiator is added to the polymerization system in the form of an aqueous dispersion which contains an ethoxylated nonionic emulsifier with an HLB-value above 15, and preferably above 17, which emulsifier does not contain cyclic inner ether bonds. Polymerizates produced according to the method have good electric insulation properties. Suitable ethoxylated nonionic emulsifiers are ethoxylated fatty acids and ethoxylated fatty alcohols. A means, suitable for polymerization of ethylenically unsaturated monomers, consists of an aqueous dispersion of a free-radical forming compound containing a nonionic ethoxylated emulsifier with an HLB-value above 15, in an amount of at least 1 percent by weight, based on the initiator, and preferably also a protective colloid such as polyvinyl alcohol. The dispersions have good stability and are easy to handle.

REFERENCES:
patent: 3825509 (1974-07-01), Miller
patent: 4039475 (1977-08-01), Oosterwijk et al.
patent: 4092470 (1978-05-01), Oosterwijk et al.
McCutchen's Publications "HLB Index of Materials" M. C. Publishing Co., New Jersey, 1978, pp. 17-33.

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