Description: 521 synthetic resins or natural rubbers -- part of the class 520 series / 521 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) (40) process of treating scrap or waste product containing solid organic polymer to recover a solid polymer therefrom (40.5) process of treating scrap or waste product containing at least one polymer derived from ethylenic unsaturated monomers only (41) treating rubber (or rubberlike materials) or polymer derived from a monomer having at least two ethylenic unsaturated moieties (41.5) treating with organic phosphorus-containing material
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