Reaction products of etherified aminotriazinealdehyde with alkali metal salts of sulfurous acid

Claim 1

A WATER-SOLUBLE, SOLID NITROGEN-CONTAINING THERMOSETTING RESIN COMPRISING THE PRODUCT OBTAINED BY CONTACTING IN AN ALKALINE AQUEOUS SOLUTION A WATER-SOLUBLE PERFORMED METHYL EITHER OF MELAMINE-FORMALDEHYDE RESIN WITH AN AMOUNT OF AN ALKALI METAL SALT OF SULFUROUS ACID SUFFICIENT TO PROVIDE AT LEAST 0.1 MOL OF COMBINED SO3 FOR EACH MOL OF MELAMINE IN SAID RESIN, SAID PREFORMED RESIN HAVING BEEN PREPARED BY REACTING 1 MOLECULAR PROPORTION OF MELAMINE WITH FROM ABOUT 3 TO 8 MOLECULAR PROPORTIONS OF FORMALDEHYDE IN AN ALKALINE AQUEOUS SOLUTION TO FORM A MELAMINE-FORMALDEHYDE RESIN AND THEREAFTER REACTING SAID MELAMINE-FORMALDEHYDE RESIN WITH AT LEAST 10 MOLECULAR PROPORTIONS OF METHANOL IN AN AQUEOUS SOLUTION AT A PH OF ABOUT 1 TO 4 TO FORM A WATER-SOLUBLE METHYL ETHER OF MELAMINE-FORMALDEHYDE RESIN CONTAINING FROM 2.5 TO 6 MOLS OF COMBINED METHANOL FOR EACH MOL OF TO 5 MOLS OF COMBINED METHANOL FOR ECH MOL OF MELAMINE, AND NETRALIZING THE RESULTING SOLUTION; AND THEN DRYING SAID FIRST MENTIONED SOLUTION UNTIL A WATER-SOLUBLE, SOLID PRODUCT IS FORMED.