| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a synthetic tar containing reduced amounts of volatile ingredients, having excellent storage stability without changes of the viscosity, etc., during long storage and allowing easy viscosity adjustment according to applications. <P>SOLUTION: The tar is a mixture comprising soft pitch obtained by distillation of tar and distillate oil obtained by distillation of tar and contains 1.5 mass% or less of naphthalene. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
