Resorcinol-formaldehyde resins and adhesives made therefrom

Claim 1

A METHOD OF MAKING A STORAGE STABLE RESORCINOLFORMALDEHYDE RESIN SOLUTION OF INFINITE DILUTABILITY COMPRISING REACTING UNDER REFLUX CONDITIONS RESORCINOL AND FORMALDEHYDE AT A MOLE RATIO OF RESORCINOL TO FORMALDEHYDE OF APPROXIMATELY 1:0.2-0.3 IN THE PRESENCE OF SUFFICIENT OXALIC ACID CATALYST TO LOWWERR THE PH TO LESS THAN 1, ADDING ADDITIONAL FORMALDEHYDE TO BRING THE RESORCINOL TO FORMALDEHYDE MOLE RATIO TO APPROXIMATELY 1:0.5-0.7, HEATING THE RESULTING MASS TO REFLUX, ADDING THERETO WATER OF DILUTION IN AN AMOUNT OF AT LEAST 0.5 PART BY WEIGHT PER PART OF RESORCINOL TO CONTROL THE EXOTHERMIC REACTION OCCASIONED BY THE FORMALDEHYDE ADDITION, ADDING ADDITIONAL FORMALDEHYDE TO BRING THE MOLE RATIO OF RESORICINOL TO FORMALDEHYDE TO APPROXIMATELY 1:0.8-0.9 AND THE PH OF THE REACTION MIXTURE TO 1.0-1.7, HEATING THE MASS UNDER REFLUX FOR A SHORT PERIOD OF TIME AND ADDING THERETO SUFFICIENT CONCENTRATED AQUEOUS CAUSTIC TO BRING THE PH WITHIN THE RANGE OF 6.5-7.0.

Claim 2

A METHOD OF MAKING A STORAGE STABLE RESORCINOLFORMALDEHYDE RESIN SOLUTION OF INFINITE DILUTABILITY COMPRISING REACTING UNDER REFLUX CONDITIONS RESORCINOL AND FORMALDEHYDE AT A MOLE RATIO OF RESORCINOL TO FORMALDEHYDE OF APPROXIMATELY 1:0.2-0.3 IN THE PRESENCE OF SUFFICIENT OXALIC ACID CATALYST TO LOWWERR THE PH TO LESS THAN 1, ADDING ADDITIONAL FORMALDEHYDE TO BRING THE RESORCINOL TO FORMALDEHYDE MOLE RATIO TO APPROXIMATELY 1:0.5-0.7, HEATING THE RESULTING MASS TO REFLUX, ADDING THERETO WATER OF DILUTION IN AN AMOUNT OF AT LEAST 0.5 PART BY WEIGHT PER PART OF RESORCINOL TO CONTROL THE EXOTHERMIC REACTION OCCASIONED BY THE FORMALDEHYDE ADDITION, ADDING ADDITIONAL FORMALDEHYDE TO BRING THE MOLE RATIO OF RESORICINOL TO FORMALDEHYDE TO APPROXIMATELY 1:0.8-0.9 AND THE PH OF THE REACTION MIXTURE TO 1.0-1.7, HEATING THE MASS UNDER REFLUX FOR A SHORT PERIOD OF TIME AND ADDING THERETO SUFFICIENT CONCENTRATED AQUEOUS CAUSTIC TO BRING THE PH WITHIN THE RANGE OF 6.5-7.0.