Description: 524 synthetic resins or natural rubbers -- part of the class 520 series / 524 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) () processes of preparing a desired or intentional composition of at least one nonreactant material and at least one solid polymer or specified intermediate condensation product, or product thereof (class 523, subclass 1) (1) adding a nrm to a preformed solid polymer or preformed specified intermediate condensation product, composition thereof; or process of treating or composition thereof (80) dnrm which is other than silicon dioxide, glass, titanium dioxide, water, halohydrocarbon, hydrocarbon, or elemental carbon (81) organic dnrm (115) phosphorus organic compound dnrm (136) pentavalent phosphorus atom directly bonded to at least one oxygen atom (140) p directly bonded to oxygen only (144) halogen
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