Patent ID: 6242539
Filing Date: 2001-06-05
Classification: C08F

Abstract:
A process for the production of chlorinated polyvinyl chloride resins which comprises chlorinating a polyvinyl chloride resin which is prepared by suspension polymerization in an aqueous medium in a reaction vessel, the aqueous medium containing at least one polyvinyl alcohol as a suspending agent and also containing a chain transfer agent, the polyvinyl chloride resin having an average particle diameter of not less than 150 .mu.m, porosity at 31-1,011 psi of not less than 0.15 cc/g and a bulk density of not less than 0.54 g/cc, the chlorinating of polyvinyl chloride resin being carried out by blowing chlorine gas into the aqueous suspension under UV irradiation with a mercury lamp in a temperature range of 40 to 90.degree. C.