Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
217 words
A process for producing an alpha-olefin polymer which comprises polymerizing at least one alpha-olefin in the gaseous phase in the presence of a catalyst composed of a solid titanium catalyst component and an organoaluminum compound, characterised in that the process is carried out under the following set of parameters (A) to (E):- (A) the catalyst is composed of a solid halogen-containing titanium catalyst component supported on a magnesium compound and said organoaluminum compound, said catalyst having been pre-treated by polymerizing in its presence not more than 200 grams, per gram of said solid titanium catalyst component, of at least one olefin; (B) the polymerization system is maintained in the fluidized state by mechanically stirring it and blowing into it said olefin in the gaseous state and/or a gaseous, easily volatile non-polymerizable hydrocarbon; (C) said olefin in the liquid state and/or a liquid, easily volatile non-polymerizable hydrocarbon is introduced into the polymerization system and the polymerization is carried out while gasifying said olefin and/or said hydrocarbon in said system; (D) unreacted olefin gas and/or easily volatile non-polymerizable hydrocarbon gas discharged from the polymerization system is partly or wholly liquefied and recycled as liquid olefin and/or hydrocarbon in (C); and (E) said olefin is blown or introduced into the polymerization system in at least one of (B) and (C).
Claim 2
Dependent Claim
217 words
A process for producing an alpha-olefin polymer which comprises polymerizing at least one alpha-olefin in the gaseous phase in the presence of a catalyst composed of a solid titanium catalyst component and an organoaluminum compound, characterised in that the process is carried out under the following set of parameters (A) to (E):- (A) the catalyst is composed of a solid halogen-containing titanium catalyst component supported on a magnesium compound and said organoaluminum compound, said catalyst having been pre-treated by polymerizing in its presence not more than 200 grams, per gram of said solid titanium catalyst component, of at least one olefin; (B) the polymerization system is maintained in the fluidized state by mechanically stirring it and blowing into it said olefin in the gaseous state and/or a gaseous, easily volatile non-polymerizable hydrocarbon; (C) said olefin in the liquid state and/or a liquid, easily volatile non-polymerizable hydrocarbon is introduced into the polymerization system and the polymerization is carried out while gasifying said olefin and/or said hydrocarbon in said system; (D) unreacted olefin gas and/or easily volatile non-polymerizable hydrocarbon gas discharged from the polymerization system is partly or wholly liquefied and recycled as liquid olefin and/or hydrocarbon in (C); and (E) said olefin is blown or introduced into the polymerization system in at least one of (B) and (C).
Claim 3
Dependent Claim
40 words
A process according to claim 1 characterised in that in said solid halogen-containing titanium catalyst component supported on a magnesium compound, the Ti/Mg atomic ratio is from 1:2 to 1:100, and the halogen/Ti mole ratio is from 4:1 to 200:1.
Claim 4
Dependent Claim
60 words
A process according to claim 1 or 2 characterised in that said solid halogen-containing titanium catalyst component supported on a magnesium compound further contains an electron donor, and the mole ratio of the electron donor to the titanium atom is from 0.1:1 to 7:1, and the mole ratio of the halogen to the titanium atom is from 5:1 to 200:1.
Claim 5
Dependent Claim
23 words
A process according to claim 1, 2 or 3 characterised in that said alpha-olefin is an alpha-olefin of 2 to 10 carbon atoms.
Claim 6
Dependent Claim
28 words
A process according to any one of the preceding claims characterised in that said prepolymerization treatment in (A) is carried out at a temperature of -30°C to 90°C.
Claim 7
Dependent Claim
42 words
A process according to any one of the preceding claims characterised in that said prepolymerization treatment in (A) is carried out by polymerizing the olefin in an amount of not more than 100 g per gram of the solid titanium catalyst component.
Claim 8
Dependent Claim
31 words
A process according to any one of the preceding claims characterised in that said easily.volatile non-polymerizable hydrocarbon in (B), (C) and (D) is a hydrocarbon having 3 to 6 carbon atoms.
Claim 9
Dependent Claim
54 words
A process according to any one of the preceding claims characterised in that the amount of the solid halogen-containing titanium catalyst component supported on a magnesium compound subjected to the prepolymerization treatment in (A) is 0.0005 to 1 millimole, calculated as titanium atom, per liter of the volume of the gas-phase polymerization reaction system.
Claim 10
Dependent Claim
42 words
A process according to any one of the preceding claims characterised in that the amount of said organoaluminum compound per liter of the volume of the gas-phase polymerization reaction system is such that the Al/Ti atomic ratio is from 1:1 to 2000:1.
Claim 11
Dependent Claim
39 words
A process according to any one of the preceding claims characterised in that the polymerization is carried out at a temperature of 30 to 130°C and a pressure of 98 to 9800 kPa (1 to 100 kg/cm 2 ).