Patent Class: Synthetic Resins Or Natural Rubbers -- Part Of The Class 520 Series (528/491)

Class 528 provides for all processes of preparing polymersfrom reactants wherein at least one reactant is devoid of ethylenicunsaturation. In addition, Class 528 provides for processes of removingcontaminates or undesirable materials from a polymer, for processesof physically treating polymer-material, or for processes of chemicallymodifying a polymer without the addition of any extraneous material.