Improving the processing properties of chlorinated PVC resins

Abstract

An earlier paper ( 1 ) established the need for new compounding technology to deal with changes in melt flow resulting from the postchlorination of PVC resins. The present work attacks the more-than-doubled melt viscosity of chlorinated PVC as measured in stabilized resin. The potential for marked reduction in viscosity, improvement in processing stability, and retention of marketable product properties is explored. The development process including the definition of performance requirements, test methods used, and resulting balance of properties is described.

Toughening of chlorinated polyvinylchloride with acrylonitrile-butadiene-styrene graft copolymers

“…It is well known to have a higher softening temperature, higher heat deflection temperature, lower flammability, lower smoke properties, and chemical inertness than conventional polyvinylchloride (PVC). However, in the literature , it has been reported that CPVC is more difficult to process. Moreover, it has poor impact strength, which limits the application of CPVC.…”

Upper critical solution temperature lubricants for CPVC

“…In order to improve the flow behavior of CPVC, such steps as reduction of molecular weight, copolymerization, and addition of minor amounts of lubricants or plasticizers have been tried. Usually the improvement in flow behavior is accompanied by a reduction in resistance to heat distortion ( 1).…”