A polymerization process includes contacting an olefin or a mixture of the olefin and one or more copolymerizable comonomers under polymerization conditions with a catalyst composition and forming a polymer with a total ash content of less than 15 ppm. The catalyst composition includes one or more polymerization catalysts; and a mixed external electron donor comprising a selectivity control agent comprising at least one silicon-containing compound containing at least one C1-C10 alkoxy group bonded to a silicon atom.

A polymerization process includes contacting an olefin or a mixture of the olefin and one or more copolymerizable comonomers under polymerization conditions with a catalyst composition and forming a polymer with a total ash content of less than 15 ppm. The catalyst composition includes one or more polymerization catalysts; and a mixed external electron donor comprising a selectivity control agent comprising at least one silicon-containing compound containing at least one C1-C10 alkoxy group bonded to a silicon atom.

A thermoplastic elastomer composition contains component (A-2), component (B), and component (C). The content of component (A-2) is 5 parts by weight or more and 95 parts by weight or less with respect to 100 parts by weight of the total amounts of components (A-2) and (B), and the content of component (C) is 0.005% by weight or more and 3% by weight or less with respect to 100% by weight of the whole amount of the thermoplastic elastomer composition. Component (A-2) is a crosslinked product of component (A-1), which is an ethylene copolymer containing a monomer unit derived from propylene and/or α-olefins having 4 to 10 carbon atoms, and a monomer unit derived from ethylene, and having a Mooney viscosity (ML.sub.1+4, 125° C.) of 50 or more. Component (B) is a propylene polymer and component (C) is an antifungal agent.

A thermoplastic elastomer composition contains component (A-2), component (B), and component (C). The content of component (A-2) is 5 parts by weight or more and 95 parts by weight or less with respect to 100 parts by weight of the total amounts of components (A-2) and (B), and the content of component (C) is 0.005% by weight or more and 3% by weight or less with respect to 100% by weight of the whole amount of the thermoplastic elastomer composition. Component (A-2) is a crosslinked product of component (A-1), which is an ethylene copolymer containing a monomer unit derived from propylene and/or α-olefins having 4 to 10 carbon atoms, and a monomer unit derived from ethylene, and having a Mooney viscosity (ML.sub.1+4, 125° C.) of 50 or more. Component (B) is a propylene polymer and component (C) is an antifungal agent.

Provided is an irradiation-crosslinked ethylene propylene diene monomer (EPDM) composition containing: EPDM 30 to 80 phr (parts per hundred resin) free of a crosslinking agent, a polyolefin (PO) resin 10 to 50 phr, a silicone rubber 5 to 40 phr, a flame retardant 20 to 30 phr, a crosslinking accelerator 5 to 10 phr, a crosslinking assistant 1 to 5 phr, an antioxidant 5 to 15 phr, and a lubricant 0.25 to 5 phr. Provided is a cable produced by: providing the irradiation-crosslinked EPDM composition; first kneading the composition using a kneader; second kneading the first kneaded composition using a roll mill; extruding the second kneaded composition using an extruder, and then cutting the extruded composition to produce pellets as a raw material for the cable; forming a cable of a predetermined length by extruding the pellets using an extruder; and irradiation-crosslinking the formed cable using an electron beam accelerator.

Provided is an irradiation-crosslinked ethylene propylene diene monomer (EPDM) composition containing: EPDM 30 to 80 phr (parts per hundred resin) free of a crosslinking agent, a polyolefin (PO) resin 10 to 50 phr, a silicone rubber 5 to 40 phr, a flame retardant 20 to 30 phr, a crosslinking accelerator 5 to 10 phr, a crosslinking assistant 1 to 5 phr, an antioxidant 5 to 15 phr, and a lubricant 0.25 to 5 phr. Provided is a cable produced by: providing the irradiation-crosslinked EPDM composition; first kneading the composition using a kneader; second kneading the first kneaded composition using a roll mill; extruding the second kneaded composition using an extruder, and then cutting the extruded composition to produce pellets as a raw material for the cable; forming a cable of a predetermined length by extruding the pellets using an extruder; and irradiation-crosslinking the formed cable using an electron beam accelerator.

Provided is an irradiation-crosslinked ethylene propylene diene monomer (EPDM) composition containing: EPDM 30 to 80 phr (parts per hundred resin) free of a crosslinking agent, a polyolefin (PO) resin 10 to 50 phr, a silicone rubber 5 to 40 phr, a flame retardant 20 to 30 phr, a crosslinking accelerator 5 to 10 phr, a crosslinking assistant 1 to 5 phr, an antioxidant 5 to 15 phr, and a lubricant 0.25 to 5 phr. Provided is a cable produced by: providing the irradiation-crosslinked EPDM composition; first kneading the composition using a kneader; second kneading the first kneaded composition using a roll mill; extruding the second kneaded composition using an extruder, and then cutting the extruded composition to produce pellets as a raw material for the cable; forming a cable of a predetermined length by extruding the pellets using an extruder; and irradiation-crosslinking the formed cable using an electron beam accelerator.

New polypropylene composition which combines low sealing initiation temperature (SIT), high hot-tack and good mechanical properties, like high dart drop strength (DDI), and its use especially for film applications.

New polypropylene composition which combines low sealing initiation temperature (SIT), high hot-tack and good mechanical properties, like high dart drop strength (DDI), and its use especially for film applications.

New polypropylene composition which combines low sealing initiation temperature (SIT), high hot-tack and good mechanical properties, like high dart drop strength (DDI), and its use especially for film applications.