Adhesive comprising a mixture of a nucleated and nonnucleated phenolic resins

Claim 1

A WATER-SOLUBLE PHENOLIC RESIN ADHESIVE CONSISTING ESSENTIALLY OF 100 PARTS OF A MIXTURE OF (A) FROM 20 TO 90 PARTS OF AN ESSENTIALLY NON-NUCLEATED BASE RESIN, WHICH IS THE CONDENSATION PRODUCT PREPARERD BY HEATING AN AQUEOUS MIXTURE OF A REACTIVE PHENOL CONTAINING NO SUBSTITUENTS IN POSITIONS ORTHO OR PARA TO THE HYDROXYL GROUP WITH FROM 1.4 TO 3.0 MOLS OF FORMALDEHYDE AND FROM 0.5 TO 1.0 MOL OF ALKALI METAL HYDROXIDE PER MOL OF THE PHENOL AT A TEMPERATURLE BETWEEN 90* C. AND BOILING POINT OF THE REACTION MIXTURE TO A VISCOSITY OF FROM 200 TO 500 CENTIPOISES MEASURED AT 25* C. AND A RESIN SOLIDS CONTENT OF 30 PER CENT, AND (B) FROM 80 TO 10 PARTS OF A NUCLEATED CATALYTIC RESIN, WHICH IS THE CONDENSATION PRODUCT PREPARED BY HEATING AN AQUEOUS MIXTURE OF SUCH REACTIVE PHENOL WITH FROM 2.25 TO 3.5 MOLS OF FORMALDEHYDE PER MOL OF THE PHENOL AND A CONDENSATION CATALYST AT A TEMPERATURE BELOW 70* C. SUFFICIENT TO CAUSE CONDENSATION OF THE PHENOL AND FORMALDEHYDE, THE REACTION BEING AT LEAST COMPLETED IN THE PRESENCE OF FROM 0.5 TO 1.0 MOL OF ALKALI METAL HYDROXIDE PER MOL OF THE PHENOL TO A VISCOSITY OF FROM 10 TO ABOUT 350 CENTIPOISES MEASURED AT 25* C. AND A RESIN SOLIDS CONTENT OF 30 PER CENT. PLYWOOD BONDED WITH THE ADHESIVE DEFINED IN CLAIM 11.