The present invention relates to a method for recrystallizing diacetal, such as 1,3:2,4-bis-O-(benzylidene)-D-sorbitol or a nuclearly substituted derivative thereof, in a polyolefin resin without giving a yellowish tint to the polyolefin resin; a polyolefin resin molded article containing a recrystallized diacetal which is obtainable by said recrystallization method; a method for producing polyolefin resin pellets containing the recrystallized diacetal by utilizing said recrystallization method, and polyolefin resin pellets obtainable by the above method; and a method for producing a polyolefin resin molded article by heating and melting said pellets at a temperature not lower than its sol-gel transition temperature during the heating cycle and rapidly cooling the melt; and a polyolefin resin molded article obtainable by said method.
本发明涉及一种在聚烯烃
树脂中重结晶二
缩醛(如 1,3:2,4-双-O-(亚苄基)-D-
山梨醇或其核取代衍
生物在聚烯烃
树脂中重结晶而不使聚烯烃
树脂呈黄色的方法;含有通过所述重结晶方法获得的重结晶二
缩醛的聚烯烃
树脂成型品;利用上述重结晶方法生产含有重结晶二
缩醛的聚烯烃
树脂颗粒的方法,以及通过上述方法获得的聚烯烃
树脂颗粒;以及通过在加热循环期间以不低于溶胶-凝胶转变温度的温度加热和熔化上述颗粒并迅速冷却熔体,生产聚烯烃
树脂模塑品的方法;以及通过上述方法获得的聚烯烃
树脂模塑品。