US3755225A
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Process for preparing homo- and copolymers of vinyl chloride in aqueous emulsion with post addition of a water-soluble ethylene oxide-ethylene glycol adduct
Abstract An aqueous emulsion polymerization process is described for the preparation of vinyl chloride homo- and copolymers which find particular utility as molding resins wherein the emulsifier system comprises, in combination, from 0.05 percent to 3 percent of an alkali metal salt of a sulfated fatty alcohol having from 8-18 C atoms per molecule; and from 0.05 percent to 2 percent of either tallow fatty alcohol or an epoxidized oil of an unsaturated fatty acid, the percentage of each ingredient being based on the weight of the monomer. After the polymerization reaction is substantially completed but prior to spray-drying of the polymerization mixture, there is blended into said mixture from 0.05 percent to 3 percent, by weight of the initial monomer charge, of an ethylene oxide adduct of ethylene glycol having a molecular weight ranging up to about 600. Plastisols of the resin products exhibit excellent dispersion rheologies and air-release properties. Moldings prepared from these resins may, in many instances, be utilized in contact with foodstuffs.
The process of claim 1 wherein from 0.002 percent to 3 percent, by weight of the monomer, of hydrogen peroxide and from about 0.003 percent to 3 percent, by weight of the monomer, of an alkali metal formaldehyde sulfoxylate are employed as the initiator system.
Claim 2
Dependent Claim
19 words
The process of claim 1 wherein the reaction temperature is within the range of 100* F to 160* F.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the alkali metal salt of a sulfated fatty alcohol of 8-18 C atoms is sodium lauryl sulfate.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein tallow fatty alcohol is employed.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the water-soluble ethylene oxide adduct of ethylene glycol employed is triethylene glycol.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein the water-soluble ethylene oxide adduct of ethylene glycol employed is a polyethylene glycol having an average molecular weight of up to 600.
Claim 7
Dependent Claim
34 words
The process of claim 1 wherein the monomer is a mixture of vinyl chloride with up to 50 percent, by weight of the mixture, of at least one other monomer copolymerizable with vinyl chloride.