| http://www.w3.org/ns/prov#value | - The poly(phenylene oxides) included as possible viscosity modifiers may be presented by the following formula ##STR20## wherein R1 is a monovalent substituent selected from the group consisting of hydrogen, hydrocarbon radicals free of a tertiary alpha-carbon atom, halohydrocarbon radicals having at least two carbon atoms between the halogen atom and phenol nucleus and being free of a tertiary alp
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