| 摘要 |
<p>PURPOSE: An ink composition is provided to have a volatile organic compound which is lower than 3%, be high in viscoelasticity and low in the rate of viscoelasticity regardless of how frequent a temperature changes. CONSTITUTION: An ink composition comprises pigment of 15-20 by weight, rosin denaturation phenol resin of 20-40 by weight of which the molecular weight ranges from 100,000 to 250,000, vegetable ester of 20-40 by weight, and drying oil and semidrying oil of 10-40 by weight. The molecular weight of the rosin denaturation phenol resin is 150,000-200,000 and the acid value is 15-25. The vegetable ester is manufactured by mixing more vegetable oil or vegetable fatty acid chosen from soybean oil, linseed oil and palm oil with materials chosen from octanol, 2-ethyl-1-hexanol, isobutanol, butanediol, ethanediol and propanediol through transesterification.</p> |
