Low inherent viscosity-high glass transition temperature enhancing agents produced by mass reaction polymerization as an overpolymer on polyvinyl chloride resins

A low inherent viscosity-high glass transition temperature treated polyvinyl chloride resin comprising:

• a polyvinyl chloride resin and a polyvinyl chloride high glass transition temperature-inherent viscosity enhancing agent, said glass transition temperature-inherent viscosity enhancing agent applied to said polyvinyl chloride resin by mass overpolymerization on and within said polyvinyl chloride resin being one or more high glass transition temperature agent forming monomers and an effective amount of one or more chain transfer agents so that the inherent viscosity of said treated polyvinyl chloride resin is reduced, said chain transfer agent being a mercaptan alcohol having from 2 to 22 carbon atoms, or H.sub.2 S gas, the amount of said polyvinyl chloride resin being from about 50 parts to about 2,000 parts by weight for every 100 parts by weight of said one or more glass transition temperature agent forming monomers.