Hexagonal crystals of diacetals, nucleating agent comprising said hexagonal crystal, polyolefin resin composition and molding containing said hexagonal crystals, and method for molding said composition

摘要

PCT No. PCT/JP96/00476 Sec. 371 Date Sep. 3, 1997 Sec. 102(e) Date Sep. 3, 1997 PCT Filed Feb. 29, 1996 PCT Pub. No. WO96/27597 PCT Pub. Date Sep. 12, 1996This invention provides hexagonal crystals of a diacetal represented by the formula (1) wherein R1 and R2 each represents an alkyl group having 1 to 4 carbon, atoms or a halogen atom, each of m and n is an integer of 0 to 2 and p is 0 or 1, a nucleating agent comprising the diacetal of the formula (1), wherein part or the whole of the diacetal is in the form of hexagonal crystals, a polyolefin resin composition and a molded product each comprising a polyolefin resin and the nucleating agent, and a method for molding the polyolefin resin composition. According to the invention, the occurrence of fish eyes and coloration in a molded product can be prevented, the optical, mechanical and thermal properties of the molded product are superior and the molding cycle is shortened.