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SULFURCONTAlNlNG PHENOLlC ANTlOXlDANTS
Esters of SulfurContaining Hydroxyphenylalkanoic Acids
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12 carbons 20 carbons acetic acid added addition alcohol aliphatic alkyl alkyl group alkylene amine amount anhydride antioxidants ANTlOXlDANTS aqueous aralkyl aromatic aryl assigned atom base benzene blended carbons carboxylic carboxylic acid catalyst chloride composition compounds of Formula condensation cooled copolymer cycloalkyl derivatives diimide dimethyl dissolved distilled dried ester ether evaporated Example extract filtered filtration fluid grams group containing halide halogen heated hexane hindered phenol hydrocarbon hydroxy hydroxyl lubricating oil metal methanol methyl minutes mixed nitrogen obtained olefin oxidation oxygen phenol phosphite phosphorus plicatic acid polyester polyethylene polymer polymeric polyolefins polypropylene preferably prepared by reacting reactants reaction mixture reaction product recrystallized reflux removed residue resins room temperature rubber salt sample selected from hydrogen sodium solution solvent stabilizers stirring substituted sulfide sulfonate sulfur synergistic synthetic tertiary toluene triethylamine U.S. Patent unstabilized polypropylene vacuum viscosity washed weight percent xylene yield zinc