| 摘要 |
PURPOSE:To mold polypropylene having a novel crystal structure by molding polypropylene substantially having a syndiotactic structure in a molten state and quenching the molded one to stretch the same and treating the stretched molded body with the vapor of a hydrocarbon compound. CONSTITUTION:A molded article has a crystal structure of a triclinic system wherein a lattice constant is a=5.72, b=7.64, c=11.6, alpha=73.1 deg., beta=88.8 deg. and gamma=112.0 deg.. Synthesized isopropylcyclopentadienyl-1-fluorene is converted to a lithium salt which is, in turn, reacted with zirconium tetrachloride and the reaction product is recrystallized to obtain isopropylzirconium dichloride. 0.2g of isopropylzirconium dichloride and 30g of methylaluminoxane are received in an autoclave and polymerized in the presence of 80l of toluene for 2hr at 20 deg.C under polymerization pressure of 3kg/cm<2>-G and the reaction product is subjected to deashing treatment by methanol and methyl acetoacetate and washed with an aqueous hydrochloric acid solution and filtered to obtain 5.6kg of syndiotactic polypropylene. This molded article has excellent strength and good transparency and is extremely valuable from an industrial aspect. |
