PURPOSE: To provide 1,3-2,4-di(4-methylbenzylidene)sorbitol containing less than respective specific amounts of a specific sorbitol, total metal component and catalyst, having excellent thermal stability, useful as a clearing nucleation agent for PP and giving a PP resin composition satisfying the transparency, odorlessness and safety at the same time.
CONSTITUTION: The objective sorbitol derivative contains ≤2wt.% of 1,3-(2- methylbenzylidene)-1,4-(4-methylbenzylidene)sorbitol, ≤50ppm of total metal component (preferably Na, Fe and Ca) and ≤50ppm of a catalyst (preferably p-toluenesulfonic acid). The sorbitol derivative is produced e.g. by reacting sorbitol with 4-methylbenzaldehyde in the presence of an acid catalyst in an organic solvent, adding an alkaline aqueous solution to the obtained reaction mass and removing the solvent e.g. by distillation.
FUKUIRI YASUSHI
OTA MASAHIRO
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