Manufacture of epoxide resins

Claim 1

THE PROCESS OF PRODUCING RESINS WHICH COMPRISES REACTING WITH HEATING A CHLORHYDRIN SELECTED FROM THE CLASS WHICH CONSISTS OF EPICHLORHYDRIN AND GLYCEROL DICHLORHYDRIN WITH A DIHYDRIC PHENOL FREE FROM REACTIVE GROUPS OTHER THAN PHENOLIC HYDROXYL GROUPS IN THE PRESENCE OF SUFFICIENT AQUEOUS CAUSTIC ALKALI TO COMBINE WITH THE CHLORINE OF THE CHLORHYDRIN AND WITH THE ADDITION OF A SMALL AMOUNT, NOT EXCEEDING ABOUT 20% OF THE RESIN FORMED, OF AN ORGANIC SOLVENT HAVING A BOILING POINT ABOVE POINT 100% C., WHICH IS FREE FROM REACTIVE GROUPS AND WHICH IS SUBSTANTIALLY INSOLUBLE IN WATER BUT WHICH IS A SOLVENT FOR THE EPICHLORHYDRIN AND WHICH IS A SOLVENT OF AND FORMS A SOLVENT-RESIN MIXTURE WITH THE RESIN PRODUCED, WITH PRODUCTION OF A RESILIENT AQUEOUS RESINSOLVENT SYSTEM, INCLUDING A TAFFY-LIKE RESIN-SOLVENT MIXTURE LAYER AND AN AQUEOUS LAYER, REMOVING THE AQUESOUS LAYER, WITHOUT PRELIMINARY TREATMENT OF THE TAFFY-LIKE RESINSOLVENT MIXTURE LAYER, FROM SAID RESULTANT AQUEOUS SYSTEM, TO YIELD A RESIN-SOLVENT MIXTURE OF TAFFY-LIKE CONSISTENCY WHICH CAN BE WASHED WITH WATER TO REMOVE SALT AND ANY EXCESS ALKALI AT A LOWER TEMPERATURE, AND AT A THINNER CONSISTENCY AT THE SAME TEMPERATURE, THAN THE RESIN WITHOUT THE SOLVENT, WASHING THE TAFFY-LIKE RESINSOLVENT MIXTURE WITH WATER TO REMOVE SALT AND ANY EXCESS ALKALI, AND HEATING THE RESULTING PRODUCT TO FREE IT FROM RESIDUAL WATER.