会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 44. 发明专利
    • IT8220258D0
    • 1982-03-18
    • IT2025882
    • 1982-03-18
    • UBE INDUSTRIES
    • UENO HARUOYANO TAKEFUMIINOUE TOKUJIIKAI SHIGERUKAI YOSHIYUKISHIMIZU MICHIMASA
    • C08F4/00C08F4/60C08F4/64C08F10/00C08F
    • Poly- alpha -olefin, for example, polypropylene, is produced by subjecting a feed containing an alpha -olefin having 3 or more carbon atoms, to a preliminary polymerization at 40 DEG C. or less in the presence of a catalyst which comprises (A) a solid catalytic ingredient prepared (a) by reacting a Grignard compound of the formula, R3MgX wherein R3=C1-8 alkyl and X=halogen, with a reaction product of an aluminium halide with an organic silicon compound of the formula, Rn1Si(OR2)4-n, wherein R1=C1-8 alkyl or phenyl, R2=C1-8 alkyl, n=0, or 1 to 3, (b) bringing the resultant solid carrier into a first contact with titanium tetrahalide, (c) treating the resultant titanium-containing solid product with an organic acid ester, and, finally, (d) bringing the treated solid product into a second contact with titanium tetrahalide; (B) another catalytic ingredient consisting of a trialkyl aluminium of the formula, AlR34 wherein R4=C2-6 alkyl; and a further catalytic ingredient consisting of an organic acid ester, and then, by subjecting a polymerization mixture containing the above-mentioned catalyst, the preliminary polymer and free alpha -olefin to a final polymerization at a temperature above 40 DEG C.