摘要:
A polyolefin is producing by polymerizing ethylene or copolymerizing ethylene and the other .alpha.-olefin at 50.degree. to 100.degree. C. in a hydrocarbon solvent in the presence of a catalyst system of an organoaluminum compound and a transition metal compound component which is a solid catalytic component containing a magnesium compound and a titanium compound under the condition (a) two step polymerizations of a first polymerization step and a second polymerization step in the presence of a reaction mixture obtained by said first polymerization step; (b) a polymerization in the presence of hydrogen at a molar ratio of H.sub.2 to C.sub.2 H.sub.4 (vapor phase) of 0.01-0.8 to produce a polymer A having a viscosity average molecular weight of 2.times.10.sup.5 -7.times.10.sup.5 at a ratio of 30 to 70 wt. % based on the total polymer in one of said first or second polymerization step and a polymerization in the presence of hydrogen at a molar ratio of H.sub.2 to C.sub.2 H.sub.4 (vapor phase) of 1.5-15 to produce a polymer B having a viscosity average molecular weight of 1.times.10.sup.4 - 4.times.10.sup.4 at a ratio of 70 to 30 wt. % based on the total polymer in the other polymerization step to give a ratio of a viscosity average molecular weight of polymer A to a viscosity average molecular weight of polymer B of 15 to 55; (c) said production of said polymer A as a copolymer of ethylene and other .alpha.-olefin and said production of said polymer B as a homopolymer of ethylene or a copolymer of ethylene and the other .alpha.-olefin; and (d) said production of the total polymer as a polymer having a melt index of less than 0.5 g/10 min.
摘要翻译:在有机铝化合物和作为固体催化剂的过渡金属化合物组分的催化剂体系的存在下,在烃溶剂中,在50℃至100℃下聚合乙烯或将乙烯和其它α-烯烃共聚制备聚烯烃 在(a)通过所述第一聚合步骤获得的反应混合物存在下进行第一聚合步骤和第二聚合步骤的两步聚合的条件下,含有镁化合物和钛化合物的组分; (b)在H 2与C 2 H 4(气相)的摩尔比为0.01-0.8的氢气存在下进行聚合,得到粘度平均分子量为2×105-7×105的聚合物A,其比例为30〜70wt。 基于所述第一或第二聚合步骤之一中的总聚合物的%,并且在氢气存在下以H 2至C 2 H 4(气相)的摩尔比为1.5-15进行聚合以产生具有粘均分子量为 1×104-4×104,比例为70〜30wt。 以聚合物A的粘均分子量与聚合物B的粘均分子量的比例为15〜55的聚合物的总聚合物为基准, (c)所述聚合物A的制备是乙烯与其它α-烯烃的共聚物,所述聚合物B的制备是乙烯均聚物或乙烯与其它α-烯烃的共聚物; 和(d)所述聚合物的总体熔融指数小于0.5g / 10分钟的聚合物。
摘要:
A solid catalytic complex for the polymerization of an olefin has the formula:[MgM.sub.1-n ]X.sub.m . xYwherein M represents a transition metal selected from the group consisting of titanium and vanadium; X represents a halogen atom; Y represents an aliphatic ether or a cyclic ether; n is 0.01 - 0.99; 2
摘要:
In a process for polymerizing an olefin in the presence of a catalyst system combining an organoaluminum compound with a hydrocarbon insoluble solid catalytic component prepared by treating a hydrocarbon solution containing a magnesium compound, and a titanium compound with an aluminum halide having the formulaAlR.sub.l.sup.1 X.sub.3-l.sup.1(R.sup.1 represents an alkyl, aryl or cycloalkyl group and X.sup.1 represents a halogen atom, and l is 1.ltoreq.l.ltoreq.2),an improvement characterized in that the magnesium compound is a compound having the formulaMg(OR.sup.2).sub.m X.sub.2-m.sup.2(R.sup.2 represents an alkyl, aryl or cycloalkyl group; X.sup.2 represents a halogen atom; and m is 1 or 2) and the titanium compound is a compound having the formulaTi(OR.sup.3).sub.n X.sub.4-n.sup.3(R.sup.3 represents an alkyl, aryl or cycloalkyl group; X.sup.3 represents a halogen atom; n is 1, 2 or 3).
摘要翻译:在将有机铝化合物与通过处理含有镁化合物的烃溶液制备的烃不溶性固体催化剂组分的催化剂体系和具有式AlRl 1 X 3 -11的卤化铝的钛化合物的催化剂体系聚合的方法中, (R1表示烷基,芳基或环烷基,X1表示卤素原子,l表示1〜2),其特征在于镁化合物为具有式Mg(OR 2)m X 2的化合物 -m2(R2表示烷基,芳基或环烷基; X2表示卤素原子,m表示1或2),钛化合物是具有式Ti(OR 3)n X 4-n 3的化合物(R3表示烷基,芳基 或环烷基; X3表示卤素原子; n为1,2或3)。
摘要:
It is devised to further enhance strength and straightening ability of a nitrocarburized raw material for crankshafts. A nitrocarburized raw material for crankshafts is formed so as to have a composition composed of C, Si, Mn, Cu, Ni, Cr, V, S, s-Al, Ca and N in prescribed % by mass, with the balance being Fe and inevitable impurities and having a structure of ferrite+pearlite; after smelting a steel having the foregoing composition, hot forging is performed; thereafter, a normalizing treatment is applied to the subject hot forged material at a treatment temperature in the range of from 780° C. to 850° C.; and straightening process for correcting bending to be caused due to the nitrocarburizing treatment is later applied.
摘要:
An object of the present invention is to provide a method for producing an alcohol-free beer-taste sparkling beverage imparted with a fruity aroma and a reduced off-flavor; and an alcohol-free beer-taste sparkling beverage imparted with a fruity aroma and a reduced off-flavor produced by the aforesaid production method. “The method for producing an alcohol-free beer-taste sparkling beverage imparted with a fruity aroma and a reduced off-flavor” in the present invention is characterized by use of a hop or a hop component stored and aged in the state of being in contact with air as a hop or a hop component used during a raw material liquid-boiling step, or adjustment of the contents of myrcene, linalool, and nerol in the beer-taste sparkling beverage so as to satisfy five particular numerical ranges by boiling the hop or the hop component in a raw material liquid.
摘要:
A fuel cell separator is produced by forming a fuel cell separator resin composition including, as essential components, (A) an epoxy resin; (B) a curing agent; (C) a curing accelerator; and (D) a carbon material, in which the content of the (D) is 50 to 85% by mass based on the total amount of the composition, in which the (D) includes high crystalline artificial graphite having an average particle size of 100 μm or more and less than 150 μm in an amount of 5 to 100% by mass based on the total amount of the (D), and in which the content of the (C) is 0.1 to 20 parts by weight per 100 parts by weight of the (B). The resin composition is excellent in electric conductivity and fluidity and contains little impurities, and can provide a fuel cell separator which is excellent in electric conductivity and dimensional accuracy, and has no fear of causing deterioration in performance of a solid electrolyte.
摘要:
Abrasion resistance is further enhanced in a sliding member used in an internal combustion engine.With respect to a valve lifter 6 used in an internal combustion engine 100, hard particles having higher hardness than the valve lifter 6 are dispersed onto the top face 61 of the valve lifter 6, and a nitriding treatment is conducted on the top face 61 dispersed with the hard particles.
摘要:
A droplet ejection apparatus includes droplet ejection units each including a supply port and an ejection port, a common supply flow path, a common discharge flow path, supply flow paths that connect the supply port to the common supply flow path, openable mechanisms provided at the supply flow paths, discharge flow paths that connect the ejection port to the common discharge flow path, one-way valves provided at the discharge flow paths, a pressure applying unit, and a controller. When performing a maintenance operation of a selected droplet ejection unit, the controller applies a pressure with the pressure applying unit so that the pressure in the plural discharge flow paths at the common discharge flow path side with respect to the respective one-way valves is higher than the other side, and opens only the openable mechanism corresponding to the selected droplet ejection unit.
摘要:
An inkjet recording apparatus has: a pressure control device which controls a liquid movement device in accordance with determination results of a first pressure determination device and a second pressure determination device in such a manner that interiors of a first liquid chamber and a second liquid chamber respectively assume prescribed pressures, wherein the pressure control device controls the liquid movement device so as to adjust the internal pressures of the first liquid chamber and the second liquid chamber in such a manner that a prescribed pressure differential between the internal pressures of the first liquid chamber and the second liquid chamber is produced and a prescribed back pressure is applied to the liquid inside a plurality of nozzles of a recording head.