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AssigneeFormosa Plastics Corporation
InventorsCheng-Yi Cheng, Shou-Yuan Lee, Kwang-Ming Chen, Won-Doon Hong
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The present invention relates to a polymerization process for polymerizing olefinically unsaturated monomer or monomers, wherein inorganic salts are employed to substitute for the traditional emulsifiers employed in the polymerization recipe. The polymerization of olefinically unsaturated monomer or monomers is conducted in the presence of a water soluble initiator. An electrolytic solution of inorganic salt and a buffer solution are introduced into the polymerization mixture at a particular time during reaction period to adequately adjust pH value of the reaction mixture. Further, it is essential to alter the speed of agitation during polymerization by a two-stage operation. The polymer resins so produced have no emulsifier residue contained within the polymer particles, whereby the properties of plastisols from these resins such as viscosity stability, heat stability and clarity are superior to those of the polymer resins produced by conventional emulsion polymerization process or microsuspension polymerization process. The monomer/water ratio of the polymerization recipe thereof is also improved, whereby productivity per batch or run of polymerization is increased.
A process for producing polymers of oil-soluble olefinic monomer(s) and copolymers thereof, characterized by comprising the steps of in an aqueous media conducting an emulsion polyermization of soil-soluble olefinic monomer in the absence of emulsifiers and in the presence of a water-soluble initiator and at a polymerization reaction temperature of about 30.degree. C. to about 75.degree. C., introducing an electrolytic solution of water-soluble inorganic salts and a buffer solution into the polymerization mixture only when the conversion of the reaction reaches about 5% to about 30% to adjust the pH value of the reaction mixture to the range of about 7.5 to about 11.5, and applying a two-stage alteration of the speed of agitation, the speed of agitation being altered from a first higher speed range during initiation of the polymerization to a second lower speed range after initiation and during polymerization to maintain stability of the colloidal state of the polymerization mixture, whereby polymer resins having no emulsifier residue contained within the polymer particles and having improved properties are produced.
A process for producing a polymer or copolymer of at least one oil-soluble olefinic monomer, comprising
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