The present disclosure relates to an olefin polymerization catalyst system for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the catalyst system comprises: (A) a first olefin polymerization procatalyst, (B) a second olefin polymerization procatalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by procatalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.

A block copolymer composition is disclosed herein. In some embodiments, a block copolymer composition has a weight average molecular weight (M.sub.w) of 70,000 g/mol to 120,000 g/mol, a polydispersity index (PDI) of 1.0 to 2.0, a glass transition temperature (T.sub.g) of −55° C. to −30° C., and a melt index (MI), measured at 230° C. and a loading condition of 5 kg, of 0.2 g/10 minutes to 3.0 g/10 minutes. The block copolymer composition has excellent processability.

This heterophasic propylene polymerization material comprises a propylene copolymer (I), an ethylene--olefin copolymer (II-1), and an ethylene--olefin copolymer (II-2), wherein the contained amount of a monomeric unit derived from an olefin other than propylene in the propylene copolymer (I) is not less than 0.05 wt % but less than 10 wt %, the limiting viscosity [].sub.1 of the propylene copolymer (I) is less than 1.50 dL/g, the contained amount of a monomeric unit derived from ethylene in the ethylene--olefin copolymer (II-2) is 10-30 wt %, and the limiting viscosity of the ethylene--olefin copolymer (II-2) is higher than that of the ethylene--olefin copolymer (II-1).

A method for producing block copolymers can include polymerizing a feedstock comprising a monomer and a comonomer under first polymerization conditions in the presence of a catalyst in a reactor to produce a first effluent comprising a first polyolefin block, an unreacted monomer, and an unreacted comonomer; blending the first effluent with a coordinative chain transfer polymerization agent to produce a mixture; and polymerizing the mixture in a separator under second polymerization conditions to cause the unreacted monomer and the unreacted comonomer to polymerize onto one end of the first polyolefin block as a second polyolefin block, thereby forming a block copolymer, wherein the first polyolefin block has a first comonomer content and the second polyolefin block has a second comonomer content that is different than the first comonomer content. The method can further include polymerizing in presence of a second coordinative chain transfer polymerization agent in a second separator.

The present disclosure is directed to a silicon-terminated telechelic polyolefin composition comprising a compound of formula (I). Embodiments related to a process for preparing the silicon-terminated telechelic polyolefin composition comprising a compound of formula (I), the process comprising combining starting materials comprising (A) a silicon-terminated organo-metal compound and (B) a silicon-based functionalization agent, thereby obtaining a product comprising the silicon-terminated telechelic polyolefin composition. In further embodiments, the starting materials of the process may further comprise (C) a nitrogen containing heterocycle. In further embodiments, the starting materials of the process may further comprise (D) a solvent.

The present disclosure is directed to a silicon-terminated telechelic polyolefin composition comprising a compound of formula (I). Embodiments related to a process for preparing the silicon-terminated telechelic polyolefin composition comprising a compound of formula (I), the process comprising combining starting materials comprising (A) a silicon-terminated organo-metal compound and (B) a silicon-based functionalization agent, thereby obtaining a product comprising the silicon-terminated telechelic polyolefin composition. In further embodiments, the starting materials of the process may further comprise (C) a nitrogen containing heterocycle. In further embodiments, the starting materials of the process may further comprise (D) a solvent.

A process to functionalize organo-zinc compounds with halosilane electrophiles employs a basic additive. The process includes combining the organo-zinc compound, a halosilanes, and a nitrogen containing heterocycle as the basic additive. The presence of the basic additive facilitates successful substitution. Functionalized silanes and silyl-terminated polyolefins can be prepared using this process. The functionalized silanes may be useful as endblockers for polyorganosiloxanes having SiH and/or silicon bonded aliphatically unsaturated groups capable of undergoing hydrosilylation.

A process to functionalize organo-zinc compounds with halosilane electrophiles employs a basic additive. The process includes combining the organo-zinc compound, a halosilanes, and a nitrogen containing heterocycle as the basic additive. The presence of the basic additive facilitates successful substitution. Functionalized silanes and silyl-terminated polyolefins can be prepared using this process. The functionalized silanes may be useful as endblockers for polyorganosiloxanes having SiH and/or silicon bonded aliphatically unsaturated groups capable of undergoing hydrosilylation.

A block copolymer composition is disclosed herein. In some embodiments, the block copolymer composition includes a diblock copolymer and a triblock copolymer which each include a polyolefin-based block and a polystyrene-based block. A content of the diblock copolymer is less than or equal to 19% by weight, based on the total weight of the block copolymer composition, the polyolefin-based block includes a repeating unit represented by Formula 1, and the polystyrene-based block includes one or more selected from the group consisting of Formulas 2 and 3.

A method for producing a block copolymer composition including a diblock copolymer and a triblock copolymer each containing a polyolefin-based block and a polystyrene-based block is disclosed herein. In some embodiments, the method includes reacting an organic zinc compound with one or more kinds of olefin-based monomers in the presence of a transition metal catalyst to form an intermediate having an olefin-based polymer block, reacting the intermediate styrene-based monomer in the presence of an alkyllithium compound to form a product having a styrene-based polymer block, and reacting the product with water, oxygen, or an organic acid to form a block copolymer wherein the number of moles of the alkyllithium compound used to form the product is larger than the number of moles of the organic zinc compound used to form the intermediate.