Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1982-03-09
1984-03-06
Smith, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
525268, 526127, 526128, 526351, 526904, C08F 402, C08F 1004
Patent
active
044355505
ABSTRACT:
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.degree. 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, R.sup.3 MgX wherein R.sup.3 =C.sub.1-8 alkyl and X=halogen, with a reaction product of an aluminium halide with an organic silicon compound of the formula, R.sub.n.sup.1 Si(OR.sup.2).sub.4-n, wherein R.sup.1 =C.sub.1-8 alkyl or phenyl, R.sup.2 =C.sub.1-8 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, AlR.sub.3.sup.4 wherein R.sup.4 =C.sub.2-6 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.degree. C.
REFERENCES:
patent: 4287328 (1981-09-01), Kikuta et al.
patent: 4297463 (1981-10-01), Ueno et al.
Ikai Shigeru
Inoue Tokuji
Kai Yoshiyuki
Shimizu Michimasa
Ueno Haruo
Smith Edward J.
Ube Industries Ltd.
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