Description: 522 synthetic resins or natural rubbers -- part of the class 520 series / 522 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) (1) compositions to be polymerized by wave energy wherein said composition contains a rate-affecting material; or compositions to be modified by wave energy wherein said composition contains a rate-affecting material; or processes of preparing or treating a solid polymer utilizing wave energy (113) processes of chemically modifying a solid polymer derived only from ethylenically unsaturated monomers by treating polymer with a chemical reactant; or compositions therefore (127) chemical reactant contains sulfur (128) elemental sulfur
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