CATALYST COMPOSITION FOR PRODUCING CASTING FORMES AND CORNS WITH FURNAE RESINE AND PROCESS FOR PRODUCING CASTING FORMES AND CORNS

摘要

A catalyst for the prepn. of furane resin contg. hot or cold setting casting moulds and cores, contains the o-isomer of phenol-sulphonic-acid in an aq. or alcoholic soln. Sulphonation takes place when equimolar quantities of phenol and concentrated sulphuric acid react at 378-388 K pref. 383 K for 60-70 mins.