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 (132) with saturated phenolic reactant or polymer thereof; or with solid copolymer derived from at least one phenolic reactant wherein at least one of the reactants forming the solid copolymer is saturated; or with spfi wherein at least one of the necessary ingredients is a phenolic reactant or with a reaction product thereof; or with a sicp containing a phenolic group si-h or si-c bond (134) contacting with aldehyde or aldehyde-type reactant or polymer therefrom (143) solid polymer derived from ethylenic reactants only is derived from a reactant containing a carboxylic acid or derivative thereof
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