Catalyst components and methods for producing polypropylene having high isotacticity and high melt flow rate.

Abstract

The present invention relates to a Ziegler-Natta catalyst composition for olefin polymerization comprising an alkyltrialkoxysilane, urea, and phthalate and 1,3-diether elements as internal electron donors. According to the present invention, the catalyst components make it possible to produce polypropylene polymers having high isotacticity and high melt flow rate.

Claims

1. A solid catalyst component for the polymerization or copolymerization of alphaolefins, comprising titanium, magnesium, halogen, alkyltrialkoxysilane compound, urea compound, and phthalate compound and 1,3-diether compound as internal donor components; The alkyltrialkoxysilane compound, Formula I R-Si(OR １ ) ３ [Formula I] (wherein R is an aliphatic, vinyl, or aromatic hydrocarbon group having 1 to 20 carbon atoms, R １ A compound is selected from those represented by (an aliphatic hydrocarbon having 1 to 20 carbon atoms); The urea compound is of formula II: 【Chemistry 1】 (wherein, R ２ , R ３ , R ４ , and R ５ may be the same or different and are independently hydrogen, an aliphatic hydrocarbon group having 1 to 20 carbon atoms, an alicyclic hydrocarbon group having 3 to 20 carbon atoms, an aromatic hydrocarbon group having 6 to 20 carbon atoms, or a heteroatom-containing hydrocarbon group having 1 to 20 carbon atoms, and two or more of R ２ , R ３ , R ４ , and R ５ may combine to form one or more saturated or unsaturated monocyclic or polycyclic rings) and is selected from compounds represented by Solid catalyst component.

2. The solid catalyst component according to claim 1, wherein the alkyltrialkoxysilane compound is selected from methyltrimethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyltriethoxysilane, propyltrimethoxysilane, propyltrimethoxysilane, butyltriethoxysilane, butyltrimethoxysilane, hexyltriethoxysilane, cyclohexyltriethoxysilane, pentyltriethoxysilane, cyclopentyltriethoxysilane, decyltriethoxysilane, and combinations thereof.

3. The solid catalyst component according to claim 1, wherein the alkyltrialkoxysilane compound comprises propyltriethoxysilane.

4. The urea compounds mentioned above are N,N,N',N'-tetramethylurea, N,N,N',N'-tetraethylurea, N,N,N',N'-tetrapropylurea, N,N,N',N'-tetrabutylurea, N,N,N',N'-tetrapentylurea, N,N,N',N'-tetrahexylurea, N,N,N',N'-tetra(cyclopropyl)urea, N,N,N',N'-tetra(cyclohexyl)urea, N,N,N',N'-tetra(cyclohexyl)urea, and N,N,N',N'-tetra(cyclohexyl)urea. The solid catalyst component according to claim 1, selected from phenylurea, bis(butylene)urea, bis(pentylene)urea, N,N'-dimethylethyleneurea, N,N'-dimethylpropyleneurea, dipropyl-2-imidazolidinone, 1,3-dibutyl-2-imidazolidinone, 1,3-dimethyl-3,4,5,6-tetrahydro-2-pyrimidinone, N,N-dimethyl-N,N,-diphenylurea, and combinations thereof.

5. The solid catalyst component according to claim 1, wherein the urea compound comprises tetramethylurea.

6. The solid catalyst component according to claim 1, wherein the phthalate compound is selected from diethyl phthalate, di-n-propyl phthalate, di-n-butyl phthalate, di-n-pentyl phthalate, di-i-pentyl phthalate, bis(2-ethylhexyl) phthalate, ethyl isobutyl phthalate, ethyl-n-butyl phthalate, di-n-hexyl phthalate, di-isobutyl phthalate, and combinations thereof.

7. The solid catalyst component according to claim 1, wherein the phthalate compound comprises diisobutyl phthalate.

8. 1,3-diether compounds are given by formula (III): 【Chemistry 2】 (In the formula, R ６ , R ７ , R ８ , R ９ , and R １０ The solid catalyst component according to claim 1, wherein is independently selected from compounds represented by a hydrocarbon group having 1 to 20 carbon atoms or an aromatic hydrocarbon group having 6 to 20 carbon atoms, which may form one or more cyclic structures.

9. The solid catalyst component according to claim 1, wherein the 1,3-diether compound comprises 2-isopentyl-2-isopropyl-dimethoxypropane.

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