FIELD: polymer production.
SUBSTANCE: title oligomers are prepared via reaction of diphenylolpropane with paraform in organic solvent under basic catalysis conditions followed by polycondensation and etherification in presence of organic solvent added and acid catalyst, particularly ion-exchange resins (sulfo-cationites) with moisture content 40-65%. Proportion of dry-weight cationite to condensation product varies between 2 and 30 wt %.
EFFECT: reduced production cost and reduced amount of waste in production of butanolyzed oligomers.
4 ex
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