PHENOL RESIN AND BINDER FOR MAKING CASING MOULDS AND CORES AFTER PHENOL RESIN-POLYURETHANE METHOD

摘要

The invention relates to phenol resin and to a binder contained in it, of particular use to the preparatopn of casting moulds and cores. The phenol resin can be produced by phenol and aldehyde condensations where, a mixture of substances which are eliminated in the production of bisphenol, the so-called bisphenol-A-resin can be used as an initial product. 11 claims