| 摘要 |
<p>Internally plasticized phenolic resins suitable for use in preparing laminates and the like excellent in electrical properties, heat resistance, solvent resistance as well as punchability are produced by reacting a compound of the formula: <IMAGE> wherein R1 is an alkylene residue having 1 to 3 carbon atoms; and R2 and R3 are independently hydrogen or a saturated or unsaturated hydrocarbon group having 1 to 3 carbon atoms, with an epoxidized vegetable oil with heating in the presence of one or more secondary and/or tertiary amines, and adding formaldehyde or one or more phenols and formaldehyde to the reaction system to further proceed the reaction.</p> |
