Sequential emulsion graft

It is well known that polymer miscibility is not only important in the case of simple mixture, but it also determines the physical nature of block and graft copolymers. Multi-layer structures have been studied in recent years as a means for improving physical and mechanical properties of the polymer composition. It is possible to obtain a number of functional properties by means of the multi-stage sequential emulsion polymerization. As concerns this multi -layer structure, we have already reported some interesting results in a study of the processing aid for polyvinyl-chloride, 5 which amazingly improved the processability for polyvinylchloride due to its multi-stage polymer composition produced by sequential emulsion polymerization. 

The system presently mder consideration is the specific multi-layer structure polymer composition, which is readily obtained by the multi-stage sequential emulsion polymerization. This multi-layer grafts contain the specific intermediate layers and having a special composition gradient between the resin layer and the elastomer layer. 

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