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 (54.4) containing chemically combined natural resin or derivative thereof other than tall oil (54.42) previously formed solid polymer chemically reacted with natural resin or derivative (54.44) at least one previously formed solid polymer derived from ethylenic monomers only
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