Phthalic Anhydride → Tall-oil rosin

Beteiligte Stoffe

Reaktionsschritte

Into a four-necked flask which is equipped with a thermometer, a Dean · Stark, a reflux condenser, a tube for introducing nitrogen gas and a stirrer, 463 parts by weight of isophthalic acid and 590 parts by weight of 1,5-pentanediol were charged. The polycondensation reaction was conducted to be the acid value of not more than 5 while stirring and increasing the temperature from 170° C to 240° C. Further, 447 parts by weight of phthalic anhydride was charged into the reaction solution and the addition reaction and the polycondensation reaction were conducted with stirring and increasing the temperature from 140° C. to 240° C. while the pressure was decreased. And then, 350 parts by weight of xylene were added in the solution, so that a solution of the polyester resin having a nonvolatile matter of 80 percent by weight, a resin acid value of 12.6 and a number average molecular weight of 5,600 was obtained. The condition for measuring the amount of the nonvolatile matter is 50° C. and 3 hours under 1 mmHg.

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