Emulsion polymerization of vinyl chloride using mixed emulsifier system in a single step in the absence of seed formation
AssigneeStauffer Chemical Company
InventorsArthur J. Yu, Donald F. Anderson
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Abstract
A one-step process for the emulsion polymerization of vinyl chloride using a water-soluble initiator and an aqueous emulsifier system of (1) a C.sub.12 -C.sub.18 straight chain alkyl or alkenyl phosphate surfactant and (2) a C.sub.12 -C.sub.20 straight chain alkyl or alkenyl alcohol and/or a straight chain saturated hydrocarbon having a carbon content of greater than 18 is disclosed. One suitable example of a straight chain phosphate surfactant is sodium lauryl phosphate. Suitable alcohols include stearyl alcohol, cetyl alcohol and eicosanol. A suitable hydrocarbon is eicosane. The resulting homo- and copolymer latices can be used in plastisols and organosols.
Claims9
In an emulsion polymerization procedure for forming vinyl chloride polymers by heating a monomer charge containing at least 50%, by weight, vinyl chloride in the presence of a water soluble initiator and an emulsifier, wherein the improvement comprises using as an emulsifier an effective amount to maintain a stable emulsion of a mixture of:
- (1) at least one C.sub.12 -C.sub.18 straight chain phosphate surfactant of the formula ##STR2## wherein R is a straight chain alkyl or alkenyl group containing from about 12 to about 18 carbon atoms inclusive, M is an ammonium or alkali metal ion and x is 1 and/or 2 and (2) at least one C.sub.12 -C.sub.20 straight chain alkyl or alkenyl alcohol or saturated hydrocarbon having a chain of greater than 18 carbon atoms to effect information of the polymers in a single step in the absence of the initial introduction of seed particles.
Dependencies are inferred from the claim text.