Process for producing granules of a polyvinyl chloride resin for preparation of paste

摘要

Granules of a polyvinyl chloride resin for preparation of paste which comprise 10% by weight or less of components having diameters of 10 mum or smaller and less than 0.5% by weight of over size components after classification using a 149 mum standard sieve, have a bulk density of 0.45 to 0.58 g/cm3 and give a plastisol comprising less than 0.3% by weight of over size components after classification using a 62 mum standard sieve, wherein the plastisol is obtained by mixing 100 g of the granules of a polyvinyl chloride resin and 50 g of dioctyl phthalate; and a process for producing granules of a polyvinyl chloride resin for preparation of paste which comprises spray-drying an aqueous dispersion of a vinyl chloride polymer obtained by emulsion polymerization or micro suspension polymerization of vinyl chloride or a mixture containing vinyl chloride and a monomer copolymerizable with vinyl chloride, classifying granular particles obtained by the spray-drying using ultrasonic vibration sieves which are equipped with a screen having an opening of 149 mum or smaller and removing the over size components.