摘要:
A prepolymerized solid catalyst for gaseous phase or slurry polymerization of alpha olefins is disclosed. The catalyst comprises a porous carrier having a particle size of 20 to 200 microns onto which has been deposited an aluminoxane and a transition metal compound having at least one cycloalkadienyl group, the transition metal being from group 4 of the Periodic Table. The transition metal is present in an amount of 0.003 to 3 mmol/gm of carrier, and the aluminum to transition metal atomic ratio is from 15 to 1000. This catalyst is then prepolymerized with 0.2 to 30 gm of an alpha olefin per gram of catalyst to form the final prepolymerized solid catalyst having an intrinsic viscosity of 0.2 to 20 dl/gm as measured in decalin at 135 deg C.
摘要:
The invention relates to a polymerization catalyst for alpha-olefins and a process for polymerizing alpha-olefins. The catalyst comprises a component having a transition metal compound supported on a carrier and an aluminoxane. The carrier may be pre-treated with an organometallic compound, a halogen-containing silicon compound or an aluminoxane. Alternatively, the above two catalyst components are subjected to preliminary polymerization of olefins. The catalyst of this invention enables the production of a spherical polymer having a good particle size distribution, an excellent bulk density and a narrow molecular weight distribution in a slurry polymerization method or a vapor-phase polymerization method, particulary the vapor-phase polymerization method. When applied to the copolymerization of at least two olefins, the catalyst has excellent polymerization activity such that an olefin copolymer having a narrow molecular weight distribution and a narrrow composition distribution is obtained.
摘要:
An olefin is polymerized or copolymerized under the presence of an olefin-polymerizing catalyst prepared from (A) a transition-metal compound or (A') a transition-metal compound loaded on a fine-particle carrier, said transition metal being selected from group IVB in the periodic table; (B) an aluminoxane; and (C) an organoaluminum compound represented by the general formula [I] or [II]:R.sup.1.sub.m Al(OR.sup.2).sub.3-m [I]R.sup.3.sub.n Al(OSiR.sup.4.sub.3).sub.3-n [II]wherein R.sup.1, R.sup.2, and R.sup.3 are selected from hydrocarbon radicals, R.sup.4 is selected from the group consisting of hydrocarbon, alkoxy, and aryloxy radicals, and m and n are positive numbers of 0
摘要:
A liquid ethylene-alpha-olefin random copolymer, characterized in that(a) it has an ethylene unit content of 10 to 85 mole % and an alpha-olefin unit content of 15 to 90 mole %,(b) it has a low molecular weight,(c) it has a narrow molecular weight distribution,(d) the dispersion of the ethylene units and alpha-olefin units in the polymer chain is in the advanced state, and(e) the directions of bonding of the alpha-olefin units in the polymer chain are nearly the same.The copolymer is prepared by copolymerizing ethylene and an alpha-olefin having 3 to 20 carbon atoms in the presence of a catalyst comprising a compound of a transition metal of Group IVb of the periodic table and an aluminoxane. The copolymer is very useful as a synthetic lubricant oil.
摘要:
An olefin is polymerized or copolymerized under the presence of an olefin-polymerizing catalyst prepared from (A) a transition-metal compound or (A') a transition-metal compound loaded on a fine-particle carrier, said transition metal being selected from group IVB in the periodic table; (B) an aluminoxane; and (C) an organoaluminum compound represented by the general formula [I] or [II]:R.sup.1.sub.m Al(OR.sup.2).sub.3-m [I]R.sup.3.sub.n Al(OSiR.sup.4.sub.3).sub.3-n [II]wherein R.sup.1, R.sup.2, and R.sup.3 are selected from hydrocarbon radicals, R.sup.4 is selected from the group consisting of hydrocarbon, alkoxy, and aryloxy radicals, and m and n are positive numbers of 0
摘要:
A process for producing a polymer or copolymer of an olefin which comprises polymerizing or copolymerizing at least one olefin with or without a diolefin in the presence of a catalyst composed of (A) a magnesium-containing solid titanium catalyst component containing magnesium, titanium, a halogen and an electron donor as essential ingredients and (B) an organoaluminum compound catalyst component; characterized in that(1) said catalyst further comprises (C) an organic silicon compound catalyst component having an Si--O--C or Si--N--C bond, and(2) said electron donor in the catalyst component (A) is a cyclic mono- or poly-ester such as diethyl furane-3,4-dicarboxylate, di-n-butyl 3,4-dihydro-2H-pyrane-5,6-dicarboxylate, di-isobutyl pyrrole-2,3-dicarboxylic, di-n-butyl thiophene-2,3-dicarboxylate, n-octyl pyrrolidine-2,3-dicarboxylate, and so on.
摘要:
A process for producing a propylene polymer having good flowability with an MFR of at least 10 g/10 minutes comprises a first polymerization stage consisting of at least two steps and a subsequent second polymerization stage. It is important to control the intrinsic viscositites of a crystalline propylene polymer obtained from the first step of the first polymerization stage and a crystalline propylene polymer obtained from the final step of the first polymerization stage.
摘要:
A process for preparation of modified polyolefin particles which comprises contacting and reacting(A) 100 wt. parts of polyolefin particles with(B) 0.01 to 50 wt. parts of at least one ethylenic unsaturated compound selected from the group consisting of carboxyl group-containing ethylenic unsaturated compounds or their carboxylic anhydrides or their carboxylic acid derivatives, hydroxyl group-containing ethylenic unsaturated compounds, amino-group-containing ethylenic unsaturated compounds, and glycidyl group-containing ethylenic unsaturated compounds,in the presence of(C) more than 10 wt. parts to not more than 50 wt. parts of a medium of a liquid state at ordinary temperature whose solubility in water at 20.degree. C. is 0.5 wt. % or less and which is capable of swelling the polyolefin, and(D) 0.01 to 10 wt. parts of a radical initiator; andmodified polyolefin particles prepared by the aforesaid process.
摘要:
A process for producing a polymer or copolymer of an olefin which comprises polymerizing or copolymerizing at least one olefin with or without a diolefin in the presence of a catalyst composed of (A) a magnesium-containing solid titanium catalyst component containing magnesium, titanium, a halogen and an electron donor as essential ingredients and (B) an organoaluminum compound catalyst component; characterized in that(1) said catalyst further comprises (C) an organic silicon compound catalyst component having an Si-O-C or Si-N-C bond, and(2) said electron donor in the catalyst component (A) is selected from the group consisting of a cyclic mono- or poly-ester such as, diethyl cyclohexene-1,2-dicarboxylate, diethyl furane-3,4-dicarboxylate, di-isobutyl pyrrole-2,3-dicarboxylate, diethyl cyclohexene-1,6-dicarboxylate, di-n-propyl 1,2-benzenediacetate, and n-butyl tetrahydrothiophene-2,3-dicarboxylate.
摘要:
A process for producing a polymer or copolymer of an olefin which comprises polymerizing or copolymerizing at least one olefin with or without a diolefin in the presence of a catalyst composed of (A) a magnesium-containing solid titanium catalyst component containing magnesium, titanium, a halogen and an electron donor as essential ingredients and (B) an organoaluminum compound catalyst component; characterized in that(1) said catalyst further comprises (C) an organic silicon compound catalyst component having an Si--O--C or Si--N--C bond, and(2) said electron donor in the catalyst component (A) is a cyclic mono- or poly-ester such as diethyl cyclohexene-1,2-dicarboxylate, di-n-butyl 1,3-cyclohexadiene-1,2-dicarboxylate, diethyl furane-3,4-dicarboxylate, di-n-butyl 3,4-dihydro-2H-pyrane-5,6-dicarboxylate, diethyl ester of cyclohexene-1,6-dicarboxylic acid, and so on.