Reaction products of polymethylol phenol and sulfited tannins
阅读：355发布：2024-01-17
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1. THE NEW WATER-SOLUBLE, HEAT STABLE, PRODUCT FORMED BY REACTING IN AN ALKALINE SOLUTION AT A TEMPERATURE OF FROM 75*C. TO 175*C., FOR TIMES RANGING FROM 15 MINUTES TO 24 HOURS A POLYMETHYLOPHENOL CONDENSATE HAVING A COMBINED FORMALDEHYDE TO PHENOL MOLAR RATIO OF FROM 1.8 TO 3.0 WITH A BARK DERIVATIVE IN A WEIGHT RATIO OF PHENOL TO BARK DERIVATIVE OF FROM 0.1 TO ABOUT 0.4 SAID BARK DERIVATIVE BEING OBTAINED BY DIGESTING A CONIFEROUS BARK AT A TEMPERATURE OF FROM 105* TO 200*C. IN AN AQUEOUS SOLUTION OF A COMPOUND OF THE GROUP CONSISTING OF A SULFUROUS ACID SALT OF SODIUM, POTASSIUM, AND AMMONIUM WHILE MAINTAINING SAID SALT IN THE REACTION SOLUTION, SAID HEATING BEING CONTINUED FOR FROM 15 TO 240 MINUTES UNTIL A CONSIDERABLE PROPORTION OF THE ORIGINALLY INSOLUBLE PART OF THE BARK IC CONVERTED INTO WATER-SOLUBLE SULFONATE SALTS, SAID SULFUROUS ACID SALT BEING IN SUCH PROPORTIONS AS TO RETAIN IN SOLUTION AT THE CONCLUSION OF THE DIGESTION AN EQUIVALENT OF FROM 0.1 TO 0.3 PART OF SO2 TO ONE PART OF THE BARK BASED ON THE OVEN DRY WEIGHT OF THE BARK, AND SEPARATING IN SOLUTION SAID BARK DERIVATIVE FROM A BARK RESIDUE.
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