AbstractA new method of curing phenolic novolac resins by means of cyclic formals under the catalytic influence of strong acids is given. It was proved that the formals react with the novolac molecules to form a highly crosslinked resite structure. As a practical consequence of this novel curing process it is possible to use the new resins at low or contact pressures in molding operations. The physical properties of the end products in general resemble those of the standard phenolic casting resins.
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