Water dispersible acid form melamine-formaldehyde resins

Claim 1

AN ESSENTIALLY DRY, WATER-DISPERSIBLE, CATIONIC RESINOUS COMPOSITION WHICH FORMS AN ACID COLLOID WHEN REDISPERSED IN WATER, PREPARED BY DEHYDRATING, AT A TEMPERATURE NOT EXCEEDING ABOUT 65*C., AN AQUEOUS, CATIONIC COMPOSITION COMPRISING THE REACTION PRODUCT OF (A) AN AQUEOUS RESINOUS SYRUP PREPARED BY REACTING FORMALDEHYDE AND AN AMINOTRIAZINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF A MELAMINE, A FORMOGUANAMINE, AN ACETOGUANAMINE AND A PROPIOGUANAMINE IN AQUEOUS MEDIUM AT A TEMPERATURE OF FROM ABOUT 20*C. TO REFLUX TEMPERATURE AND A PH OF FROM ABOUT 6 TO 12 TO GIVE A THERMOSETTING RESINOUS CONDENSATE IN SYRUP FORM, WHEREIN THE FORMALDEHYDE IS INTRODUCED INTO THE SPHERE OF REACTION IN AMOUNTS APPROXIMATING 1/NTH OF THE TOTAL QUANTITY OF FORMALDEHYDE TO BE INTRODUCED, N TIMES, WHERE N IS AN INTEGER OF AT LEAST 2 THE MOL RATIO OF FORMALDEHYDE TO SAID AMINOTRIAZINE COMPOUND BEING FROM ABOUT 0.9:1 TO ABOUT 1.2:1, RESPECTIVELY, AND THE RESIN SOLIDS CONTENT OF SAID CONDENSATE IN SAID SYRUP BEING NOT GREATER THAN ABOUT 65%, AND (B) AN ACID SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC, SULFURIC, PHOSPHORIC, TRICHLORACETIC AND LACTIC, THE MOL RATIO OF SAID (B) TO SAID AMINOTRIAZINE COMPOUND BEING FROM ABOUT 0.7:1 TO ABOUT 3:1, RESPECTIVELY, THE REACTION BETWEEN SAID (A) AND SAID (B) BEING CARRIED OUT AT A TEMPERATURE OF FROM ABOUT 20*C. TO 75*C. AND A SOLIDS CONTENT OF ABOUT 10% TO 50% AND FOR A SUFFICIENT PERIOD OF TIME TO AGE THE RESULTING CONDENSATE TO A COLLOIDAL CONDITION WHEREIN COLLOIDAL PARTICLES CARRY A POSITIVE ELECTRICAL CHARGE.