Formation of aldehyde condensation products

Claim 1

A PROCESS WHICH COMPRISES IMPREGNATING A FIBROUS MATERIAL WITH A SOLUTION IN AN IONIZING SOLVENT OF THE INGREDIENTS OF AN ALDEHYDE RESIN, WHOSE FORMATION IS CATALYSED BY ACID, CONTAINING IN SOLUTION AN ACID SALT OF A POLYBASIC ACID SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC, PHOSPHOROUS, PYROPHOSPHORIC, MALONIC, MALIC, MALEIC, TARTARIC AND SUCCINIC ACIDS HAVING A FIRST DISSOCIATION CONSTANT IN WATER OF AT LEAST 10-6, WITH A METAL SELECTED FROM THE GROUP CONSISTING OF LITHIUM, BARIUM, CALCIUM, STRONTIUM, MAGNESIUM, ZINC, COPPER, FERROUS IRON, MANGANESE, CADMIUM, AND COBALT OF WHICH A LESS ACID SALT WITH THE SAME POLYBASIC ACID WILL BE PRECIPITATED BEFORE SAID ACID SALT WHEN WATER IS REMOVED FROM THE SOLUTION, AND A COMPLEXING AGENT SELECTED FROM THE GROUP CONSISTING OF ETHYLENE DIAMINE TETRAACETIC ACID, ALKALI METAL SALTS OF ETHYLENE DIAMINE TETRAACETIC ACID, NITRILO TRIACETIC ACID, ALKALI METAL SALTS OF NITRILO TRIACETIC ACID, CYCLO HEXYLENE DIAMINE TETRAACETIC ACID AND ALKALI METAL SALTS OF CYCLO HEXYLENE DIAMINE TETRAACETIC ACID, AND THEREAFTER EVAPORATING WATER FROM AND HEATING THE IMPREGNATED MATERIAL WHEREBY TO EFFECT CONDENSATION OF THE RESIN-FORMING INGREDIENTS.