Synthetic resins or natural rubbers -- part of the class 520 series

SECTION I - CLASS DEFINITION

This Class is directed to (a) ion-exchange polymers and process for their preparation, (b) processes of treating scrap or waste product containing solid organic polymer to recover a solid polymer therefrom, and (c) cellular products (such as foams, pores, channels, etc.) and processes of preparing such products. See Subclass References to the Current Class, below.