| 摘要 |
PURPOSE:To provide a method for projection of alpha-alkylstyrene oligomers, especially trimer or more, capable of improving conversion to the oligomers of trimer or more and readily recovering and recycling the catalyst. CONSTITUTION:This method for production of alpha-alkylstyrene oligomers is carried out by reacting an alpha-alkylstyrene, e.g. a compound of the formula [R<1> and R<2> are each a 1 to 6C alkyl; (n) is 0 to 5] in the presence of a heteropolyacid, preferably silicomolybdic acid, phosphomolydbic acid, borotungstic acid, silicotungstic acid or phosphotungstic acid in a solventless solid-liquid heterogeneous system at 3 to 80 deg.C, especially 50 to 60 deg.C and preferably ordinary pressure to 10kg/cm<2>. The amount of used catalyst is 0.5 to 100wt.%, especially 2 to 50wt.% based on the raw material. This method enables production of the alpha-alkylstyrene oligomers of trimer or more in a high yield although those oligomers can obtained only as a low-yield by-product in the conventional method. |
