Description: 525 synthetic resins or natural rubbers -- part of the class 520 series / 525 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) (50) mixing of two or more solid polymers; mixing of solid polymer or sicp with sicp or spfi; mixing of sicp with an ethylenic agent; mixing of solid polymer with a chemical treating or ethylenic agent; or processes of forming or reacting; or the resultant product of any of the above operations (55) at least one solid polymer derived from ethylenic reactants only (63) mixing of solid graft or graft-type copolymer with other solid polymer wherein one of said solid polymers is not derived from ethylenic reactants only; mixing of said polymer mixture with a chemical treating agent; or mixing of graft or graft-type copolymer with a sicp or spfi; or processes of forming or reacting; or the resultant product of any of the above operations (64) solid graft or graft-type copolymer derived from ethylenic reactants only (67) with solid polymer derived from at least one hal-c(=o)-hal, o-c(=o)-o or hal-c(=o)-o- reactant wherein at least one of the reactants forming the solid polymer is saturated; or with spfi wherein at least one of the necessary ingredients is a hal-c(=o)-hal, o-c(=o)-o, or hal-c(=o)-o containing reactant or reaction product thereof; or with a sicp containing a hal-c(=o)- or o-c(=o)-o- group
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