摘要:
A process for preparing an olefin homopolymer or copolymer comprises contacting ethylene, an alpha-olefin, or a combination, and a catalytic amount of a metal-ligand complex catalyst of a particular formula that requires at least one halogen atom that is ortho to a bridging moiety. The strategic location of the halogen atom(s) ensures a product having a molecular weight that is predictably and significantly reduced in comparison with that of copolymers produced using otherwise identical metal-ligand complex catalysts that lack halogen atoms at the specified sites.
摘要:
A process to prepare a relatively inexpensive utility fluid comprises contacting together ethylene and a coordination-insertion catalyst and, optionally, an alpha-olefin, in a continuously-fed backmixed reactor zone under conditions such that a mixture of a hyperbranched oligomer and a branched oligomer is formed. The hyperbranched oligomer has an average of at least 1.5 methine carbons per oligomer molecule, and at least 40 methine carbons per one-thousand total carbons, and at least 40 percent of the methine carbons is derived from the ethylene, and the average number of carbons per molecule is from 25 to 100, and at least 25 percent of the hyperbranched oligomer molecules has a vinyl group and can be separated from the branched oligomer, which has an average number of carbons per molecule of up to 20. The coordination-insertion catalyst is characterized as having an ethylene/octene reactivity ratio up to 20 and a kinetic chain length up to 20 monomer units.
摘要:
The instant invention provides a polyolefin composition suitable for sealant applications, sealant compositions, method of producing the same, and films and multilayer structures made therefrom. The polyolefin composition suitable for sealant applications according to the present invention comprises: an ethylene/?-olefin interpolymer composition having a Comonomer Distribution Constant (CDC) in the range of from 40 to 110, vinyl unsaturation of less than 0.1 vinyls per one thousand carbon atoms present in the backbone of the ethylene-based polymer composition; a zero shear viscosity ratio (ZSVR) in the range of from 1.01 to 2.0; a density in the range of from 0.908 to 0.922 g/cm3, a melt index (I2 at 190 C / 2.16 kg) in the range of from 0.5 to 5.0g/10 minutes, a molecular weight distribution (defined as the weight average molecular weight divided by the number average molecular weight,Mw/Mn) in the range of from 2.0 to 4.0, and tan delta at 0.1 radian/second, determined at 190 °C, in the range of from 5 to50.
摘要:
Disclosed herein are methods of preparing a catalyst system comprising a spray-dried activator and polymerization processes employing these catalyst systems.
摘要:
The invention provides a solution polymerization process to form an ethylene/α-olefin/nonconjugated polyene interpolymer, said process comprising polymerizing ethylene, an α-olefin, and a nonconjugated polyene in at least one reactor in the presence of a catalyst selected from Formula I, as described herein; and wherein the polymerization is conducted in a continuous process; and wherein the interpolymer has a rheology ratio (V0.1/V100 at 19°C) greater than, or equal to, 20.
摘要:
The present disclosure is directed to a composition and articles containing the composition. The composition includes an ethylene-propylene-diene interpolymer (EPDM) having a rheology ratio greater than 33. The EPDM also has a molecular weight distribution greater than 3.0. The composition has a dissipation factor less than or equal to 0.01 radians as measured in accordance with ASTM D 150 (130°C, 60 Hz).
摘要翻译:本公开涉及含有该组合物的组合物和制品。 该组合物包含流变比大于33的乙烯 - 丙烯 - 二烯互聚物(EPDM)。该EPDM还具有大于3.0的分子量分布。 该组合物具有根据ASTM D 150(130℃,60Hz)测量的小于或等于0.01弧度的损耗因子。
摘要:
Ultra-high molecular weight polyethylene has a molecular weight greater than 20 x 106 gm/mol as determined by ASTM 4020 or by size exclusion chromatography (SEC) and is produced by polymerizing ethylene with a catalyst composition comprising a Group 4 metal complex of a phenolate ether ligand.
摘要:
The present invention generally relates to a process that selectively polymerizes ethylene in the presence of an alpha-olefin, and to a metal-ligand complex (precatalyst) and catalyst useful in such processes, and to related compositions. The present invention also generally relates to ligands and intermediates useful for preparing the metal-ligand complex and to processes of their preparation.
摘要:
An ethylene-based polymer composition has been discovered and is characterized by a Comonomer Distribution Constant greater than about 45. The new ethylene-based polymer compositions are useful for making many articles, especially including films. The polymers are made using a metal complex of a polyvalent aryloxyether.
摘要:
An ethylene-based polymer composition has been discovered and is characterized by a Comonomer Distribution Constant greater than about 45. The new ethylene-based polymer compositions are useful for making many articles, especially including films. The polymers are made using a metal complex of a polyvalent aryloxyether.