| 摘要 |
PURPOSE:To obtain a light-color petroleum resin by copolymerizing a specified fraction from petroleum thermal cracking, containing aromatic and aliphatic hydrocarbon compounds at a low temperature in the presence of a catalyst. CONSTITUTION:A fraction (a) having a b.p. of 150-200 deg.C and contained aromatic unsaturated hydrocarbon compounds, obtained in the production of ethylene and propylene by the thermal cracking of petroleum is mixed with 5-50% fraction having a b.p. of 15-70 deg.C and containing aliphatic unsaturated hydrocarbon compounds, obtained from the same thermal cracking. The obtained mixture is copolymerized at a low temperature of 0--30 deg.C in the presence of a Friedel- Crafts catalyst to obtain the purpose resin. The polymerization temperature is specified at 0--30 deg.C for the following reasons. When it is below -30 deg.C, the degree of polymerization of the resin is too high, so that its compatibility with oils or resins is decreased. When it is above 0 deg.C, the degree of polymerization of the resin is low enough to show improved compatibility but its scope of application is limited because the hue of the resin approaches that of the conventional resin.
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