Phenolic resin and method of producing the same
a technology of phenolic resin and phenolic resin, which is applied in the direction of synthetic resin layered products, chemistry apparatus and processes, layered products, etc., can solve the problems of resin components adhering to molds for mold processing, low hardening properties of epoxy resin,
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example 1
[0103] Into a 500 ml round-bottom flask equipped with a thermometer, stirrer and condenser was charged 194 g (1 mol) of 1,3-bis(2-hydroxy-2-propyl)benzene, 312 g of toluene, 3.8 g of p-toluenesulfonic acid monohydrate and 15 g of water, and they were stirred at 95° C. for 2 hours, then, cooled and allowed to stand still to cause liquid separation, to obtain a reaction solution in which 1,3-bis(2-hydroxy-2-propyl)benzene had been partially dehydrated. The amount of hydroxyl groups removed in this reaction was 66% of the total amount of hydroxyl groups in the charged 1,3-bis(2-hydroxy-2-propyl)benzene, according to GC analysis.
[0104] Into a 1 L round-bottom flask equipped with a thermometer, stirrer, condenser with liquid separation tube, and dropping funnel was charged 118 g (1.25 mol) of phenol, 208 g of toluene and 3.8 g of p-toluenesulfonic acid monohydrate, and they were stirred at 115 to 125%, and the above reaction solution was dropped into this over 6 hours. During the reacti...
example 2
[0108] The same procedure as in Example 1 was conducted except that the amount of phenol charged into a 1 L round-bottom flask equipped with a thermometer, stirrer, condenser with liquid separation tube, and dropping funnel was 141 g (1.5 mol), to obtain a phenolic resin (P-2).
[0109] In the reaction solution at completion of this reaction, 13.1% of phenol initially charged remained.
[0110] The hydroxyl group equivalent of the phenolic resin (P-2) was 216 g / eq., and according to GPC analysis, binuclear component: 3.1%, trinuclear component: 18.1%, pentanuclear component: 20.7%, heptanuclear component: 17.6%, nonanuclear component: 13.6%, 11 or more nuclear component: 27.0%. Even number nuclear components having 4 or more nucleuses were not detected.
[0111] As a result of measurement by high performance liquid chromatography, a compound corresponding to a compound (b) having a structure composed of 2 structural units derived from phenol and 2 structural units derived from 1,3-bis(2-h...
example 3
[0121] The same procedure as in Example 1 was conducted except that the dropping time of the reaction solution in which 1,3-bis(2-hydroxy-2-propyl)benzene had been partially dehydrated was 4 hours. In the reaction solution after completion of the reaction, 13.7 mol % of phenol initially charged remained.
[0122] After completion of the reaction, neutralization, de-solvent treatment and de-phenol treatment were conducted, to obtain a phenolic resin (P-3). As a result of measurement by high performance liquid chromatography, the content ratio of the resulted compound (a) having a molecule structure composed of 3 structural units derived from phenol and 2 structural units derived from 1,3-bis(2-hydroxy-2-propyl)benzene was 94.9%. This compound (a) had a molecular weight of 599.
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