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 (226) material contains aluminum compound other than aluminum trihalide or nonmetallic organic complex of aluminum trihalide
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