摘要:
The invention provides a composition comprising an ethylene-based polymer, wherein the ethylene-based polymer comprises the following properties: a) a Mw(abs)/Mw(conv) > 2.60; and b) a CDFR IR (at Mw 0.145.
摘要:
A process is provided to form an ethylene-based polymer, in the presence of at least one free-radical, said process comprises at least the following: polymerizing a mixture comprising ethylene, in a reactor configuration comprising at least three reaction zones, and comprising two ethylene feed streams, and wherein the ratio (R LCBf40% ), in percent, of the "LCB content of the first 40 wt% of the total polymer formed" to "the total LCB content in the final polymer" is ≤ 22.5%; and wherein the amount of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the first reaction zone, is from 40 mole% to 80 mole%, based on the total moles of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the polymerization.
摘要:
A process to form an ethylene-based polymer, said process comprising at least the following: polymerizing a mixture comprising ethylene, in the presence of at least one free-radical initiator, and in a reactor configuration comprising at least three reaction zones and at least two ethylene feed streams; and wherein the inlet pressure of the first reaction zone is less than, or equal to, 3200 Bar; and wherein the amount of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the first reaction zone is from 40 mole% to 80 mole%, based on the total moles of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the polymerization; and wherein the average polymerization temperature of the first 40 wt% polymer formed (APT 40wt% ) (based on the total amount of polymer formed) is less than, or equal to, 200°C.
摘要:
A process to form an ethylene-based polymer, in the presence of at least one free-radical, said process comprises at least the following: polymerizing a mixture comprising ethylene in a reactor configuration comprising at least four reaction zones, and comprising at least three ethylene feed streams; and wherein the ratio of ( R LCBf40% ), in percent, of the LCB content of the "first 40 wt% of the total polymer formed" to the "total LCB content in the final polymer" is ≤ 29%; and wherein the amount of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the first reaction zone, is from 20 mole% to 70 mole%, based on the total moles of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the polymerization.
摘要:
Systems and processes for rapidly depressurizing a reactor system are disclosed. The systems and processes are particularly useful in the high pressure polymerization of ethylene.
摘要:
The present application relates to a process for producing a multimodal polyethylene composition comprising the steps of polymerizing a polyethylene fraction (A-1) having a weight average molecular weight Mw of equal to or more than 500 kg/mol to equal to or less than 10,000 kg/mol and a density of equal to or more than 915 kg/m 3 to equal to or less than 960 kg/m 3 in one reaction step and polymerizing a polyethylene fraction (A-2) having a lower weight average molecular weight Mw as polyethylene fraction (A-1) and a density of equal to or more than 910 kg/m 3 to equal to or less than 975 kg/m 3 in a second reaction step of a sequential multistage process wherein one of said polyethylene fractions is polymerized in the presence of the other of said polyethylene fractions to form a first polyethylene resin (A) having a weight average molecular weight Mw of equal to or more than 150 kg/mol to equal to or less than 1,500 kg/mol, and a density of equal to or more than 910 kg/m 3 to equal to or less than 975 kg/m 3 , wherein the weight average molecular weight Mw of the first polyethylene resin (A) is lower than the weight average molecular weight Mw of the polyethylene fraction (A-1), blending the first polyethylene resin (A) with a second polyethylene resin (B) having a weight average molecular weight Mw of equal to or more than 50 kg/mol to less than 500 kg/mol, and a density of equal to or more than 910 kg/m 3 to equal to or less than 970 kg/m 3 to form said multimodal polyethylene composition, wherein the multimodal polyethylene composition a melt flow rate MFR 5 (190°C, 5 kg) of 0.01 to 10 g/10 min and a density of equal to or more than 910 kg/m 3 to equal to or less than 970 kg/m 3 a polyethylene composition obtainable by said process and the polyethylene resin of said first polymerization step.
摘要翻译:本申请涉及一种生产多峰聚乙烯组合物的方法,其包括以下步骤:聚合重均分子量Mw等于或大于500kg / mol至等于或小于10,000的聚乙烯部分(A-1) kg / mol,在一个反应步骤中密度等于或大于915kg / m 3至等于或小于960kg / m 3,并且将具有较低重均分子量Mw的聚乙烯部分(A-2)聚合为聚乙烯 分数(A-1),密度等于或大于910kg / m 3至等于或小于975kg / m 3,在其中一个所述聚乙烯部分在存在下聚合的第二反应步骤 的另一个所述聚乙烯级分以形成重均分子量Mw等于或大于150kg / mol至等于或小于1,500kg / mol的第一聚乙烯树脂(A),并且密度等于 或超过910 kg / m3等于或 小于975kg / m 3,其中第一聚乙烯树脂(A)的重均分子量Mw低于聚乙烯组分(A-1)的重均分子量Mw,将第一聚乙烯树脂(A)与 重均分子量Mw等于或大于50kg / mol至小于500kg / mol的第二聚乙烯树脂(B),等于或大于910kg / m 3的密度等于或小于 超过970kg / m3以形成所述多峰聚乙烯组合物,其中所述多峰聚乙烯组合物的熔体流动速率MFR5(190℃,5kg)为0.01至10g / 10min,密度等于或大于910kg / m3至等于或小于970kg / m 3的可通过所述方法获得的聚乙烯组合物和所述第一聚合步骤的聚乙烯树脂。
摘要:
The invention relates to a process a system and a high pressure pump for the preparation of a copolymer of ethylene and a di- or higher functional (meth) acrylate in a tubular reactor, comprising the steps of: injecting ethylene at a pressure of 100 MPa to 350 MPa into the reactor from a high pressure compressor and injecting the (meth)acrylate at a pressure of 100 MPa to 350 MPa into the reactor from a high pressure pump, wherein the high pressure pump comprises - a pump suction chamber for receiving a medium to be compressed; - a cylinder for receiving the medium to be compressed from the pump suction chamber; - an outlet for discharging a compressed medium from the cylinder, - a seal fixed to the inner wall of the cylinder at an end of the cylinder distal to the outlet and - a plunger movable in the cylinder by sliding through the seal, wherein a leakage gap is present along the plunger and the leakage gap is fluidly connected to the pump suction chamber.
摘要:
The invention relates to carbohydrate ligands presenting the minimal Human Natural Killer-1 (HNK-1) epitope that bind to anti-MAG (myelin-associated glycoprotein) IgM antibodies, and their use in diagnosis as well as for the treatment of anti-MAG neuropathy. In particular, the invention relates to disaccharides of formula (I) and (II) wherein Z is optionally substituted phenyl, heteroaryl, arylcarbonyl, or heteroarylmethyl, and to therapeutically acceptable polymers comprising a multitude of substituents of formula (I) and/or formula (II), wherein Z is a bifunctional linker connecting the disaccharides to the polymer backbone.