Abstract: Disclosed is a processing aid for vinyl chloride resin containing a plasticizer or an internal lubricant for vinyl chloride resin within methyl methacrylate-based polymer particles; and a method of manufacturing the same. The processing aid according to the present invention containing the plasticizer or the internal lubricant increases a melting rate of the vinyl chloride resin when compared to the conventional processing aid including a methyl methacrylate-based polymer alone, thereby improving the processibility and properties of the vinyl chloride resin.

Abstract: Provided is a method for preparing uniformly sized and shaped, mono-dispersed microcapsules using miniemulsion polymerization. In microcapsules prepared by the method, a liquid or solid core encapsulated by a polymer shell has 10 to 80% by volume of the microcapsules. Since miniemulsion particles produced at an early stage of the method are stable, an organic material which is well dissolved in monomer particles and has a higher interfacial tension with water, relative to the polymer shell, can be uniformly positioned in polymer particles. Furthermore, when a crosslinking agent is added during the polymerization, single-core microcapsules can be obtained. In addition, use of an oil-soluble initiator can prevent formation of secondary particles and addition of a secondary initiator during the polymerization can increase the yield of the uniformly sized and shaped microcapsules.

Abstract: The present invention relates to a method of the seed(ed) emulsion polymerization using a submicron-sized liquid particle as seed, more particularly to a method of the seed(ed) emulsion polymerization comprising the steps of (1) preparing a stable miniemuslion via homogenizing the following ingredients—at least one liquid material, an emulsifier, a hydrophobe, deionized water and, optionally, an initiator; and (2) adding at least one monomer and, optionally, an emulsifier and deionized water, and/or an initiator, at once, batchwise or continuously, to the prepared miniemulsion seed and polymerizing them. Also, it is possible to contain the liquid material inside the resultant latex.