Process for manufacturing chlorinated polyvinylchloride

A process for the preparation of chlorinated polyvinyl chloride (CPVC);

• said process comprising the following steps:
• i. polymerizing vinyl chloride in the presence of at least one dispersing agent, at a temperature in the range of 50 to 80° C. to obtain a reaction mixture, wherein the conversion of monomer is greater than 86%;
• ii. separating unreacted vinyl chloride from said reaction mixture to obtain a slurry comprising polyvinyl chloride;
• and
• iii. reacting said slurry with chlorine in the presence of at least one irradiation source of wavelength ranging from 254 to 530 nm, under agitation at a speed ranging from 100 to 1600 rpm, for a time period ranging from 2 to 12 hours while maintaining a temperature in the range of 50 to 80° C. to obtain chlorinated polyvinyl chloride (CPVC).