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    • 1. 发明授权
    • Highly reactive aromatic hydrocarbon-formaldehyde resin and process for
preparing the same
    • 高反应性芳烃 - 甲醛树脂及其制备方法
    • US4689392A
    • 1987-08-25
    • US844437
    • 1986-03-26
    • Akira MiyamotoToshiaki NishimuraYoshitaka YamagishiYasumitsu Higuchi
    • Akira MiyamotoToshiaki NishimuraYoshitaka YamagishiYasumitsu Higuchi
    • C08G8/28C08G10/02C08G10/04C08G14/04C08G16/02
    • C08G14/04C08G10/02C08G10/04C08G8/28
    • A highly reactive aromatic hydrocarbon-formaldehyde resin having a diarlymethane content of not more than 5% by weight, essentially containing reactive groups of any one of CH.sub.2 OH, CH.sub.2 OCH.sub.3 and CH.sub.2 OCH.sub.2 OCH.sub.3 at both molecular terminals and having a xylenol value of at least 15 mol/kg as an index of reactivity with a compound having active hydrogen atoms is prepared by reacting an aromatic hydrocarbon such as xylene, mesitylene or naphthalene with formaldehyde at a molar ratio of the formaldehyde to the aromatic hydrocarbon of 2.0 to 5.0, a sulfuric acid concentration of 15 to 35% by weight in an aqueous layer and a reaction temperature of 80.degree. to 110.degree. C. while controlling a formaldehyde conversion within a range of 50 to 70% by mole over the range 4 to 8 hours. By reaction of the aromatic hydrocarbon-formaldehyde resin with the compound having reactive hydrogen atoms such as phenols and carboxylic acids, a modified aromatic hydrocarbon resin capable of giving a cured resin having a high mechanical strength and a high heat resistance can be obtained.
    • 二甲苯含量为5重量%以下的高反应性芳烃 - 甲醛树脂,基本上含有两个分子末端的CH 2 OH,CH 2 OCH 3和CH 2 OCH 2 CH 3中的任何一种的反应性基团,二甲苯酚值至少为15mol / kg 作为与具有活性氢原子的化合物的反应性的指标,是通过使二甲苯,均三甲苯,萘等芳香族烃与甲醛与芳香族烃的摩尔比为2.0〜5.0,硫酸浓度15 至35重量%,反应温度为80℃至110℃,同时在4-80小时的范围内控制甲醛转化率为50至70摩尔%。 通过芳族烃 - 甲醛树脂与具有反应性氢原子的化合物如酚和羧酸的反应,可以获得能够得到具有高机械强度和高耐热性的固化树脂的改性芳族烃树脂。