BLOCK CHLORINATED POLYOLEFINS FOR USE AS IMPACT MODIFIER ENHANCERS FOR PVC OR CPVC

摘要

Block chlorinated polyolefins are disclosed as performance enhancer of high rubber graft copolymers or chlorinated polyethylenes impact modifier in PVC and/or CPVC resins. The block chlorinated polyolefins (e.g. block chlorinate d polyethylene) provide good dispersion of the impact modifier particles in th e matrix and better adhesion between the impact modifier and the PVC and/or CP VC interface, providing better physical properties such as impact strength as measured by Notched Izod than did the randomly chlorinated polyolefins, ofte n used as processing aids and as impact modifiers in PVC or CPVC. The differences in properties achieved with block chlorinated polyolefins versus randomly chlorinated polyolefins are attributed to the individual blocks of the blocky polyolefin being compatible with either the impact modifier or th e PVC/CPVC resulting in better adhesion between phases.