摘要:
A polyolefin composition is provided which consists essentially of isotactic polypropylene and, optionally, repeating units of one or more comonomers, wherein the total comonomer repeating unit content of the polyolefin composition is from 0 to 20 mole percent, and further, wherein the weight average branching index g′ for the lower molecular weight region of the polyolefin composition is less than 0.93. Additionally, a process is provided for producing a polyolefin composition comprising: a) contacting, in solution, at a temperature from about 90° C. to about 120° C., propylene monomers with a catalyst composition comprising a first chiral, stereorigid transition metal catalyst compound capable of producing isotactic polypropylene; b) copolymerizing the product of a) with propylene and, optionally, one or more copolymerizable monomers, in a polymerization reactor under suitable polypropylene polymerization conditions using a second chiral, stereorigid transition metal catalyst capable of producing isotactic polypropylene; and c) recovering a branched olefin polymer.
摘要:
Stereospecific polypropylene macromers having a high percentage of vinyl terminal bonds and a method for preparing them are provided. The stereospecific polypropylene macromers have number average molecular weights (M.sub.n) of about 2,000 Daltons to about 50,000 Daltons, and the total number of vinyl groups per 1000 carbon atoms is greater than or equal to 7000.div.M.sub.n. The method for preparing the macromers involves:a) contacting, in solution, at a temperature from about 90.degree. C. to about 120.degree. C., two or more propylene monomers with a catalyst composition comprising a chiral, stereorigid transition metal catalyst compound; andb) recovering stereospecific polypropylene chains having number average molecular weights of about 2,000 Daltons to about 50,000 Daltons and significant vinyl unsaturation.
摘要:
A polyolefin product is provided which comprises a branched olefin copolymer having an isotactic polypropylene backbone, polyethylene branches and, optionally, one or more comonomers. The total comonomer content of the branched olefin copolymer is from 0 to 20 mole percent. Also, the mass ratio of the isotactic polypropylene to the polyethylene ranges from 99.9:0.1 to 50:50. Additionally, a process is provided for preparing a branched olefin copolymer which comprises: a) copolymerizing ethylene, optionally with one or more copolymerizable monomers, in a polymerization reaction under conditions sufficient to form copolymer having greater than 40% chain end-group unsaturation; b) copolymerizing the product of a) with propylene and, optionally, one or more copolymerizable monomers, in a polymerization reactor under suitable polypropylene polymerization conditions using a chiral, stereorigid transition metal catalyst capable of producing isotactic polypropylene; and c) recovering a branched olefin copolymer.
摘要翻译:提供了一种聚烯烃产品,其包含具有全同立构聚丙烯骨架的支链烯烃共聚物,聚乙烯分支和任选的一种或多种共聚单体。 支链烯烃共聚物的总共聚单体含量为0〜20摩尔%。 另外,全同立构聚丙烯与聚乙烯的质量比为99.9:0.1〜50:50。 另外,提供了一种制备支链烯烃共聚物的方法,其包括:a)在足以形成具有大于40%的链端基不饱和度的共聚物的条件下,在聚合反应中将乙烯任选地与一种或多种可共聚单体共聚; b )使用可产生全同立构聚丙烯的手性立体刚性过渡金属催化剂,在合适的聚丙烯聚合条件下,在聚合反应器中将a)的产物与丙烯和任选的一种或多种可共聚单体共聚; 和c)回收支链烯烃共聚物。
摘要:
A polyolefin product is provided which comprises a branched olefin copolymer having an isotactic polypropylene backbone, polyethylene branches and, optionally, one or more comonomers. The total comonomer content of the branched olefin copolymer is from 0 to 20 mole percent. Also, the mass ratio of the isotactic polypropylene to the polyethylene ranges from 99.9:0.1 to 50:50. Additionally, a process is provided for preparing a branched olefin copolymer which comprises: a) copolymerizing ethylene, optionally with one or more copolymerizable monomers, in a polymerization reaction under conditions sufficient to form copolymer having greater than 40% chain end-group unsaturation; b) copolymerizing the product of a) with propylene and, optionally, one or more copolymerizable monomers, in a polymerization reactor under suitable polypropylene polymerization conditions using a chiral, stereorigid transition metal catalyst capable of producing isotactic polypropylene; and c) recovering a branched olefin copolymer.
摘要翻译:提供了一种聚烯烃产品,其包含具有全同立构聚丙烯骨架的支链烯烃共聚物,聚乙烯分支和任选的一种或多种共聚单体。 支链烯烃共聚物的总共聚单体含量为0〜20摩尔%。 另外,全同立构聚丙烯与聚乙烯的质量比为99.9:0.1〜50:50。 另外,提供了一种制备支链烯烃共聚物的方法,其包括:a)在足以形成具有大于40%的链端基不饱和度的共聚物的条件下,在聚合反应中将乙烯任选地与一种或多种可共聚单体共聚; b )使用可产生全同立构聚丙烯的手性立体刚性过渡金属催化剂,在合适的聚丙烯聚合条件下,在聚合反应器中将a)的产物与丙烯和任选的一种或多种可共聚单体共聚; 和c)回收支链烯烃共聚物。
摘要:
A polyolefin product is provided which comprises a branched olefin copolymer having an syndiotactic polypropylene backbone, polyethylene branches and, optionally, one or more comonomers. The total comonomer content of the branched olefin copolymer is from 0 to 20 mole percent. Also, the mass ratio of the syndiotactic polypropylene to the polyethylene ranges from 99.9:0.1 to 50:50. Additionally, a process is provided for preparing a branched olefin copolymer which comprises: a) copolymerizing ethylene, optionally with one or more copolymerizable monomers, in a polymerization reaction under conditions sufficient to form copolymer having greater than 40% chain end-group unsaturation; b) copolymerizing the product of a) with propylene and, optionally, one or more copolymerizable monomers, in a polymerization reactor under suitable polypropylene polymerization conditions using a chiral, stereorigid transition metal catalyst capable of producing syndiotactic polypropylene; and c) recovering a branched olefin copolymer.
摘要翻译:提供了一种聚烯烃产品,其包含具有间同立构聚丙烯主链,聚乙烯分支和任选的一种或多种共聚单体的支链烯烃共聚物。 支链烯烃共聚物的总共聚单体含量为0〜20摩尔%。 另外,间同立构聚丙烯与聚乙烯的质量比为99.9:0.1〜50:50。 另外,提供了一种制备支链烯烃共聚物的方法,其包括:a)在足以形成具有大于40%的链端基不饱和度的共聚物的条件下,在聚合反应中将乙烯任选地与一种或多种可共聚单体共聚; b )使用可产生间同立构聚丙烯的手性立体刚性过渡金属催化剂,在合适的聚丙烯聚合条件下,在聚合反应器中将a)的产物与丙烯和任选的一种或多种可共聚单体共聚; 和c)回收支链烯烃共聚物。
摘要:
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35% to about 85% isotactic polypropylene and from about 30% to about 70% of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.
摘要:
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35% to about 85% isotactic polypropylene and from about 30% to about 70% of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.
摘要:
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35% to about 85% isotactic polypropylene and from about 30% to about 70% of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.
摘要:
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35% to about 85% isotactic polypropylene and from about 30% to about 70% of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.
摘要:
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35% to about 85% isotactic polypropylene and from about 30% to about 70% of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.