Description: 526 synthetic resins or natural rubbers -- part of the class 520 series / 526 synthetic resins or natural rubbers -- part of the class 520 series/() synthetic resins (class 520, subclass 1) (72) polymers from only ethylenic monomers or processes of polymerizing, polymerizable compositions containing only ethylenic monomers as reactants or processes of preparing (89) polymerizing in the presence of a specified material other than monomer (90) material contains transition metal or compound thereof (123.1) material contains compound of group ia (li, na, k, rb, cs, fr) or group iia (be, mg, ca, sr, ba, ra) metal wherein ia or iia metal is not bonded to hydrogen or to carbon (124.1) contains nontransition elemental metal, hydride thereof, or carbon to non-transition metal atom bond (124.2) contains a magnesium compound as the group iia metal compound (124.3) contains at least one additional specified material (124.7) contains at least two non-transition elemental metals, hydrides thereof, or compounds containing carbon to non-transition metal atom bond, or mixtures thereof (124.8) contains organic non-metal containing b, si, n, p, or chalcogen material
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