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US 10,358,505 B2Granted
Process for production of high melt flow propylene-based polymer and product from same
AssigneeW. R. Grace & Co.-Conn.
InventorsLinfeng Chen, Tak W. Leung, Tao Tao, Kuanqiang Gao
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Abstract
Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.
Claims12
A Ziegler-Natta polymerization process for producing a propylene-based polymer comprising:
- (A) contacting, under polymerization conditions and in the presence of hydrogen gas (H2), propylene and optionally one or more comonomers with a catalyst composition comprising:
- (i) a procatalyst composition comprising a substituted-1,2-phenylene dibenzoate having structure (I),
- wherein R1-R14 are the same or different, each of R1 and R4 is selected from the group consisting of a C1-C8 alkyl group, a C2-C8 alkenyl group, and combinations thereof, each of R2 and R3 is selected from the group consisting of hydrogen and a hydrocarbyl group having 1 to 20 carbon atoms, and each of R5-R14 is selected from hydrogen, a halogen, a hydrocarbyl group having 1 to 20 carbon atoms, and a hydrocarbyloxy group having 1 to 20 carbon atoms,
- (ii) a cocatalyst, and
- (iii) an external electron donor;
- (B) maintaining a H2/propylene mole ratio from 0.005 to less than 0.1 during the contacting;
- and
- (C) forming a propylene-based polymer having a melt flow rate greater than 50 g/10 min,
- wherein the polymerization process is selected from the group consisting of gas phase, slurry, and a bulk polymerization, operating in one or more than one reactor.
6 more elements
A Ziegler-Natta polymerization process for producing a propylene-based polymer comprising:
- (A) contacting, under polymerization conditions and in the presence of hydrogen gas (H2), propylene and optionally one or more comonomers with a catalyst composition comprising:
- (i) a procatalyst composition comprising a substituted-1,2-phenylene dibenzoate having structure (I),
- wherein R1-R14 are the same or different, each of R1 and R4 is selected from the group consisting of a C1-C8 alkyl group, a C2-C8 alkenyl group, and combinations thereof, each of R2 and R3 is selected from the group consisting of hydrogen and a hydrocarbyl group having 1 to 20 carbon atoms, and each of R5-R14 is selected from hydrogen, a halogen, a hydrocarbyl group having 1 to 20 carbon atoms, and a hydrocarbyloxy group having 1 to 20 carbon atoms,
- (ii) a cocatalyst, and
- (iii) an external electron donor;
- (B) maintaining a H2/propylene mole ratio from 0.005 to less than 0.1 during the contacting;
- and
- (C) forming a propylene-based polymer having a melt flow rate greater than 200 g/10 min
- wherein the polymerization process is selected from the group consisting of gas phase, slurry, or a bulk polymerization, operating in one or more than one reactor.
6 more elements
Dependencies are inferred from the claim text.