Precondensation of a Mixture of Epoxy-4,4'-Isopropylidenediphenol and Phenol-Formaldehyde Oligomers in Solution |
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| Authors: | Krasovskii A. N. Filippov V. N. |
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| Affiliation: | (1) Pigment Open Joint-Stock Research and Production Company, St. Petersburg, Russia |
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| Abstract: | Kinetic viscosity curves  (t) for solutions of a mixture of epoxy-4,4'-isopropylidenediphenol and phenol-formaldehyde resins in Cellosolve at 333 K were studied. The optimal precondensation time t was determined for the oligomer mixture in solution in the presence of orthophosphoric acid. |
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