摘要:
According to the present invention there are provided a catalyst component, a catalyst using the catalyst component and a process using the catalyst, for the preparation of olefin polymers high in molecular weight and relatively wide in molecular weight distribution, using an extremely small amount of a modified organoaluminum compound such as methylaluminoxane and in high yield. The catalyst component is prepared by contacting at least the following constituents (1), (2), (3) and (4) with one another: (1) a compound represented by the general formula Me.sup.1 R.sup.1.sub.p (OR.sup.2).sub.q X.sub.4-p-q where R.sup.1 and R.sup.2 are each independently a hydrocarbon group having 1 to 24 carbon atoms, X is a halogen atom, Me is Zr, Ti or Hf, p and q are each an integer in the ranges of 0.ltoreq.p.ltoreq.4 and 0.ltoreq.q.ltoreq.4, provided 0.ltoreq.p+q.ltoreq.4; (2) at least one compound selected from the group consisting of compounds represented by the following general formulas 1 to 4: General formula 1: Me.sup.2 R.sup.3.sub.m (OR.sup.4).sub.n X.sup.2.sub.z-m-n General formul 2: Me.sup.3 H.sub.2 R.sup.5.sub.3-a General formula 3: Me.sup.4 �Me.sup.3 H.sub.b R.sup.6.sub.c (OR.sup.7).sub.4-b-c !.sub.y General formula 4: ##STR1## where R.sup.3,R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8, which may be the same or different, are each independently a hydrocarbon group having 1 to 24 carbon atoms, Me.sup.2 is a Group 1, 2, 12 or 13 element in the Periodic Table of Elements, Me.sup.3 is a Group 13 element in the same Table, Me.sup.4 is a Group 1, 2, or 12 element in the same Table, X.sup.2 is a halogen atom, z is the valence of Me.sup.2, y is the valence of Me.sup.4, and m, n, a, b, c and d are each an integer in the ranges of 0.ltoreq.m.ltoreq.z, 0.ltoreq.n.ltoreq.z, provided 0.ltoreq.m+m.ltoreq.z, 0
摘要:
According to the present invention there is provide a catalyst capable of affording an olefin homopolymer or copolymer having a high molecular weight and a relatively wide molecular weight distribution, in high yield, using an extremely small amount of a modified organoaluminum compound (particularly methylaluminoxane).The catalyst comprises the modified organoaluminum compound and a catalyst component comprising the following compounds (1) and (2): (1) a compound represented by the general formula R.sub.p MX.sub.4-p where M is a transition metal of Group IVa in the Periodic Table, R is cyclopentadienyl, substituted cyclopentadienyl, indenyl, substituted indenyl, or an aralkyl group having 7 to 24 carbon atoms, provided Rs may be bonded together through an alkylene groups having 2 to 8 carbon atoms and/or silylene group, X is a halogen atom, a hydrogen atom or a hydrocarbon residue having 1 to 24 carbon atoms, and p is a number satisfying the condition of 1.ltoreq.p.ltoreq.4; and (2) a compound containing carbon-fluorine bond.
摘要:
A device for stabilizing the attitude of an automobile having an automobile body and lefthand and right-hand road wheels which are rotatably supported on the automobile body, includes cylinder means independently disposed between the road wheels and the automobile body and having respective fluid chambers, the cylinder means being operable depending on fluid pressures in the fluid chambers, a communication pipe mechanism connectable for bringing the fluid chambers of the cylinder means into fluid communication with each other, valve means disposed in the communication pipe mechanism, for pressurizing a fluid in the communication pipe mechanism and controlling the direction of flow of the fluid in the communication pipe mechanism, detecting means including at least an automobile speed sensor for detecting the speed of travel of the automobile and a steering reactive force sensor for detecting a steering reactive force, and control means responsive to detected signals from the detecting means responsive to detected signals from the detecting means for controlling the valve means to transfer the fluid from the fluid chambers of the cylinder means which are located on a radially inner side of a turning circle when the automobile makes a turn into the fluid chambers of the cylinder means which are located on a radially outer side of the turning circle, thereby to stabilize the attitude of the automobile.
摘要:
Reagent for analysis of triglycerides contained in blood serum is provided, which comprises lipases and monoglyceride lipases capable of acting on monoglycerides having substrate specificity and capable of catalyzing the following enzymatic reaction: monoglyceride+H.sub.2 O.fwdarw.glycerol+fatty acids. The glycerol or fatty acids are measured to learn an amount of the triglycerides or fatty acid by any known analytical method.
摘要翻译:提供了用于分析血清中含有的甘油三酯的试剂,其包含能够作用于具有底物特异性并能够催化以下酶促反应的单酸甘油酯的脂肪酶和甘油单酯脂肪酶:单酸甘油酯+ H 2 O->甘油+脂肪酸。 测量甘油或脂肪酸,以通过任何已知的分析方法学习一定量的甘油三酯或脂肪酸。
摘要:
A process for producing polyethylene is disclosed in which ethylene is polymerized in the presence of a composite catalyst. The catalyst is made up of a solid catalyst component typified by a selected chromium compound, a modified aluminum compound typified by a trialkylaluminum and an R.sub.n.sup.1 Al(OR.sup.2).sub.3-n compound wherein R.sup.1 and R.sup.2 are represented by selected hydrocarbon groups and n by 0.ltoreq.n.ltoreq.3. The polymer has improved melt index, flow parameter and melt tension characteristics.
摘要:
A macromer of the general formula (3) is prepared by a reaction between a silane compound of the general formula (1) and a polyethylene glycol monoalkyl ether of the general formula (2). ##STR1##H--OCH.sub.2 CH.sub.2 .sub.m OR.sub.3 (2) ##STR2## R.sub.1 : H, or C.sub.1 -C.sub.5 alkyl group; R.sub.2 : H, C.sub.1 -C.sub.5 alkyl group, or --OCH.sub.2 CH.sub.2).sub.p OR.sub.4 ;R.sub.3 : C.sub.1 -C.sub.10 alkyl;R.sub.4 : C.sub.1 -C.sub.10 alkyl;l: integer of from 1 to 10 (1.ltoreq.l.ltoreq.10);m: integer of from 1 to 30 (1.ltoreq.m.ltoreq.30); andp: integer of from 1 to 30 (1.ltoreq.p.ltoreq.30).
摘要:
A process for producing polyethylene of ultrahigh molecular weight having an intrinsic viscosity of 10-30 dl/g at 135.degree. C. in decalin is disclosed which comprises at least the following two stages of polymerization reaction: (a) a first reaction stage where in ethylene is polymerized with use of a catalyst comprising a solid component containing at least Mg, Ti and/or Va and in the absence or presence of hydrogen of reduced concentration to produce 70-99.5 weight parts of polyethylene having an intrinsic viscosity of 12-32 dl/g at 135.degree. C. in decalin; and (b) a second reaction stage wherein a fresh feed of ethylene is polymerized in the presence of hydrogen of higher concentration to produce 30-0.5 weight parts of polyethylene having an intrinsic viscosity of 0.1-5 dl/g at 135.degree. C. in decalin.
摘要:
A novel NAD synthetase is produced by culturing a broth of Bacillus stearothermophilus H-804 FERM BP-1408. This new enzyme selectively catalyzes the reaction ##STR1## without catalyzing the reaction ##STR2## The enzyme uses ammonia or ammonium ion as a substrate, but does not use either glutamine or asparagine. Also disclosed is an assay method using the enzyme, for any one of ATP, deamide-NAD, ammonia or ammonium ion in a specimen to be assayed.
摘要:
A catalyst for polymerization of olefins is disclosed which comprises a titanium and/or vanadium compound supported on a silicon and/or aluminum oxide carrier. This carrier has peculiar characteristics including a specified proportion of highly spherical oxide particles, a selected average pore size and a specified proportion of a selected particle size range before and after ultrasonic treatment, whereby there is obtained a catalyst having increased bulk density, narrow particle size distribution and high fluidity.
摘要:
A thermoplastic elastomer composition prepared by partially crosslinking a composition comprising the following components (A), (B) and (C):(A) 30-70 parts by weight of an ethylene/.alpha.-olefin copolymer prepared by copolymerizing ethylene and an .alpha.-olefin having 3 to 12 carbon atoms in the presence of a catalyst comprising a solid component and an organoaluminum compound which solid component contains at least magnesium and titanium, said ethylene/.alpha.-olefin copolymer having the following properties (I) to (IV):______________________________________ (I) Melt index 0.01-100 g/10 min (II) Density 0.860-0.910 g/cm.sup.3 (III) Maximum peak not lower than 100.degree. C. temperature as measured according to a differential scanning calorimetry (DSC) (IV) Insolubles in boiling not less than 10 wt. % n-hexane ______________________________________ (B) 70-30 parts by weight of a propylene polymer; and(C) 70-200 parts by weight, based on 100 parts by weight of the components (A) and (B), of an ethylene/.alpha.-olefin copolymer rubber.