Loading patent…
AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorsKunizoh Kidoh, Hideki Wakamori, Fujio Suzuki, Takao Iwasaki
Estimating the term…
Fine particles of polyvinyl chloride produced by bulk polymerization which comprise substantially discrete spherical particles with particle sizes of 0.2 to 2 microns, a plastisol prepared by adding 80 parts by weight of dioctylphthalate to 100 parts by weight of said particles having a viscosity of 50,000 centipoise or less (measured by a B-type viscometer, No. 4 rotor, 12 rpm, 25.degree. C.) and a process for producing the same which comprises subjecting vinyl chloride to bulk polymerization in the presence of a dispersing stabilizer under gentle stirring without causing sedimentation or agglomeration of the polymer particles formed, wherein polymerization is terminated at a polymerization yield of 5 to 30%.
A process for producing fine particles of polyvinyl chloride, which comprises subjecting vinyl chloride to bulk polymerization in the presence of a dispersion stabilizer under gentle stirring without causing sedimentation or agglomeration of the polymer particles formed, wherein the polymerization is terminated at a polymerization yield of 5 to 30% thereby to obtain fine particles of polyvinyl chloride comprising substantially discrete spherical particles with particle sizes of 0.2 to 2 microns, which are characterized in that a plastisol prepared by adding 80 parts by weight of dioctyl phthalate to 100 parts by weight of said particles has a viscosity of 50,000 centipoise or less (measured by a B-type viscometer, No. 4 rotor, 12 rpm, 25.degree. C.).
Dependencies are inferred from the claim text.