摘要:
An ethylene polymerization catalyst comprising a supported precursor of vanadium trihalide/electron donor complex and alkylaluminum or boron halides, when combined with alkylaluminum cocatalyst and alkyl halide promoter, provides enhanced polymerization and productivity plus superior polyethylene.
摘要:
An ethylene polymerization catalyst comprising a supported precursor of vanadium trihalide/electron donor complex and alkylaluminum or boron halides, when combined with alkylaluminum cocatalyst and alkyl halide promoter provides enhanced polymerization and productivity plus superior polyethylene.
摘要:
Ethylene copolymers having a very low molecular weight are continuously prepared in a fluidized bed in the presence of reduced concentrations of hydrogen, at improved catalyst activity and polymer productivity, by effecting polymerization in the presence of a dialkylzinc compound.
摘要:
Ethylene copolymers having a density of about 0.91 to 0.94 and a melt flow ratio of about .gtoreq.26 to .ltoreq.40 are readily produced in a low pressure gas phase process at a productivity of .gtoreq.500,000 pounds of polymer per pound of Ti with a catalyst formed from selected organo aluminum compounds and a composition prepared by copulverizing magnesium dihalide with a complex obtained by contacting a titanium compound of the structure Ti(OR).sub.a X.sub.b with an ether, ester, ketone or amine,wherein R is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, or COR' where R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical,X is Cl, Br, I or mixtures thereof, a is 0 or 1, b is 2 to 4 inclusive and a+b=3 or 4.
摘要翻译:密度为约0.91至0.94,熔体流动比约> = = 26至<= 40的乙烯共聚物在低压气相法中容易产生,生产率≥500,000磅聚合物/磅 Ti与由选择的有机铝化合物形成的催化剂组成的组合物,以及通过使二卤化镁与通过使Ti(OR)a Xb结构的钛化合物与醚,酯,酮或胺接触而获得的络合物制备的组合物,其中R是C1 C 14脂族或芳族烃基,或COR',其中R'为C 1至C 14脂族或芳族烃基,X为Cl,Br,I或其混合物,a为0或1,b为2至4, + b = 3或4。
摘要:
Gas phase polymerization processes are disclosed which utilize unsupported soluble transition metal coordination catalysts. The catalysts are introduced into the reactor as a solution.
摘要:
Ethylene copolymers having improved optical properties in film form are prepared by continuously copolymerizing ethylene with one or more higher alpha olefin monomers in a low pressure gas phase reaction with a catalyst composition prepared by forming a precursor composition from a magnesium compound, titanium compound, and electron donor compound; diluting said precursor composition with an inert carrier material; optionally partially activating the diluted precursor composition with an organo aluminum compound prior to introducing said diluted precursor composition into the polymerization reactor; and completely activating the diluted (and optionally partially activated) precursor composition in the polymerization reactor with a mixture of a dihydrocarbyl aluminum halide compound and a trihydrocarbyl aluminum compound.
摘要:
Ethylene copolymers having a density of .gtoreq.0.91 to .ltoreq.0.96 and a melt flow ratio of .gtoreq.22 to .ltoreq.32 are readily produced in a low pressure gas phase process at a productivity of .gtoreq.50,000 pounds of polymer per pound of Ti with a particulate catalyst diluted with an inert carrier material and formed from selected organo aluminum compounds and a precursor composition of the formula:Mg.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED].sub.qwherein ED is a selected electron donor compound.m is .gtoreq.0.5 to .ltoreq.56n is 0 or 1p is .gtoreq.6 to .ltoreq.116q is .gtoreq.2 to .ltoreq.85R is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, andX is selected from the group consisting of Cl, Br, I, or mixtures thereof.
摘要:
A catalyst formed from selected organo aluminum compounds and a precursor composition of the formulaMg.sub.m Ti.sub.l (OR).sub.n X.sub.p [ED].sub.qwhereinED is a selected electron donor compoundm is .gtoreq.0.5 to .ltoreq.56n is 0 or 1p is .gtoreq.6 to .ltoreq.116q is .gtoreq.2 to .ltoreq.85R is a C.sub.1 to C.sub.14, aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, andX is selected from the group consisting of Cl, Br, I, or mixtures thereof, which catalyst is in particulate form and diluted with an inert carrier material; a process for preparing such catalyst; a process for using said catalyst to readily prepare ethylene homopolymer having a density of about .gtoreq.0.958 to .ltoreq.0.972 and a melt flow ratio of .gtoreq.22 to .ltoreq.32 in a low pressure gas phase process at a productivity of .gtoreq.50,000 pounds of polymer per pound of Ti. Novel polymers and molded articles are prepared.
摘要:
A catalyst formed from selected organo aluminum compounds and a precursor composition of the formulaMg.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED].sub.qwhereinED is a selected electron donor compoundm is .gtoreq.0.5 to .ltoreq.56n is 0 or 1p is .gtoreq.6 to .ltoreq.116q is .gtoreq.2 to .ltoreq.85R is a C.sub.1 to C.sub.14, aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C.sub.1 to C.sub.14 aliphatic or aromatic hydrocarbon radical, andX is selected from the group consisting of Cl, Br, I,or mixtures thereof, which catalyst is in particulate from and diluted with an inert carrier material; a process for preparing such catalyst; a process for using said catalyst to readily prepare ethylene homopolymer having a density of about .gtoreq.0.958 to .ltoreq.0.972 and a melt flow ratio of .gtoreq.22 to .ltoreq.32 in a low pressure gas phase process at a productivity of .gtoreq.50,000 pounds of polymer per pound of Ti. Novel polymers and molded articles are prepared.