Method for producing propylene copolymer using catalyst system having improved copolymerization activity
AssigneeHanwha Totalenergies Petrochemical Co., Ltd.
InventorsSeung Cheol LEE, Sun Jae PARK, Young Joo LEE
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Abstract
Disclosed is a method of producing a propylene-based copolymer using a solid catalyst including a carrier, produced by the reaction between dialkoxy magnesium and a metal halide, a titanium halide, and an organic electron donor. According to the disclosure, it is possible to produce a propylene-based copolymer having a high comonomer content and a low amorphous content while maintaining catalyst activity at a highly level and dramatically reducing agglomeration of polymer particles during the production of the copolymer.
Claims20
A method of producing a propylene polymer or a propylene-based copolymer using a catalyst system,
- wherein the catalyst system comprises:
- a Ziegler-type catalyst as a main catalyst component comprising magnesium, titanium, a halogen and an internal electron donor;
- an alkyl aluminum compound as a cocatalyst;
- and
- an external electron donor composed of:
- a) a dialkoxysilane-based compound represented by the following Formula 1;
- b) a trialkoxysilane-based compound represented by the following Formula 2;
- and c) a trialkoxysilane-based compound represented by the following Formula 3:
- R1R2Si(OR3)2 [Formula 1]
- wherein R1 and R2 are each independently an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, a cycloalkyl group having 4 to 12 carbon atoms, an alkylamine group having 1 to 12 carbon atoms, an alkylsilyl group having 1 to 12 carbon atoms, or an alkoxysilyl group having 1 to 12 carbon atoms, and R3 represents an alkyl group having 1 to 3 carbon atoms;
- R4Si(OR5)3 [Formula 2]
- wherein R4 represents an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, a cycloalkyl group having 4 to 12 carbon atoms, an alkylamine group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alkylsilyl group having 1 to 12 carbon atoms, or an alkoxysilyl group having 1 to 12 carbon atoms, and R5 represents an alkyl group having 1 to 4 carbon atoms;
- R6Si(OR7)3 [Formula 3]
- wherein R6 represents an alkenyl group having 2 to 12 carbon atoms, and R7 represents an alkyl group having 1 to 4 carbon atoms.
A catalyst system for production of a propylene polymer or a propylene-based copolymer, the catalyst system comprising:
- a Ziegler-type catalyst as a main catalyst component comprising magnesium, titanium, a halogen and an internal electron donor;
- an alkyl aluminum compound as a cocatalyst;
- and
- an external electron donor composed of:
- a) a dialkoxysilane-based compound represented by the following Formula 1;
- b) a trialkoxysilane-based compound represented by the following Formula 2;
- and c) a trialkoxysilane-based compound represented by the following Formula 3:
- R1R2Si(OR3)2 [Formula 1]
- wherein R1 and R2 are each independently an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, a cycloalkyl group having 4 to 12 carbon atoms, an alkylamine group having 1 to 12 carbon atoms, an alkylsilyl group having 1 to 12 carbon atoms, or an alkoxysilyl group having 1 to 12 carbon atoms, and R3 represents an alkyl group having 1 to 3 carbon atoms;
- R4Si(OR5)3 [Formula 2]
- wherein R4 represents an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, a cycloalkyl group having 4 to 12 carbon atoms, an alkylamine group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alkylsilyl group having 1 to 12 carbon atoms, or an alkoxysilyl group having 1 to 12 carbon atoms, and R5 represents an alkyl group having 1 to 4 carbon atoms;
- R6Si(OR7)3 [Formula 3]
- wherein R6 represents an alkenyl group having 2 to 12 carbon atoms, and R7 represents an alkyl group having 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.