摘要:
Methacrylonitrile higher in purity than that obtained by the conventional process is efficiently produced by the present improved process for producing purified methacrylonitrile in which the reaction mixture formed by the ammoxidation of isobutylene or tert-butyl alcohol is distilled using water as solvent to obtain a crude methacrylonitrile solution which contains methacrylonitrile as major constituent, methacrolein, hydrogen cyanide, and isobutyronitrile, and the crude methacrylonitrile solution is then purified in a product column, wherein the improvement comprises first removing isobutyronitrile from said crude solution, then feeding the remaining solution to the product column, withdrawing from the top a vapor containing methacrolein, condensing the vapor, returning a greater part of the condensate to the product column while removing the remainder from the distillation system, and withdrawing purified methacrylonitrile from the middle or lower section, preferably from a point lower than the feeding stage.
摘要:
The display monitor of a rear projection system is pivotally connected to the projector body and provided with a resilient member that permits opening of the monitor in a vertical direction by the application of a small force during maintenance of the system.
摘要:
A process for the preparation of acrylonitrile by the ammoxidation reaction of propylene, characterized by using an oxide type catalyst which contains, as active ingredients, molybdenum, bismuth, iron and at least one element selected from potassium, rubidium and cesium in specifically limited proportions and which may further contain sodium and/or phosphorus. By the use of such a specific catalyst, the selectivity for the desired acrylonitrile is remarkably improved, and there can be attained high yield of the product. In the process of the present invention, the catalyst can maintain a high activity and a high selectivity for a long time, without undergoing attrition. The catalyst is well prevented from sublimation-escaping of the ingredient molybdenum therefrom.
摘要:
A swivel device for a monitor capable of adjusting the swivel operating force even after assembling. The device includes a base plate, an output gear disposed rotatably on the base plate and rotated and driven by an electric motor, a clutch plate rotated and driven while frictionally contacting with the output gear by way of a slip portion, a monitor mounting plate mounted and fixed on the clutch plate, and a part for adjusting the contact frictional force of the clutch plate on the output gear.
摘要:
The present invention provides a method of producing polyalkylene terephthalate, which comprises: introducing a prepolymer of polyalkylene terephthalate that is in a molten state comprising 70 mol % or more of ethylene terephthalate or 1,4-butylene terephthalate repeating units and having an intrinsic viscosity [η] between 0.2 and 2 dl/g through a feed opening to a polymerization reactor; discharging the introduced prepolymer from holes of a perforated plate; and polymerizing the prepolymer under reduced pressure, while allowing the prepolymer to fall along the surface of a support that is open towards the outside at a temperature between the [crystalline melting point−10° C.] of the prepolymer or higher and the [crystalline melting point+30° C.] of the prepolymer or lower under the conditions represented by a formula S1/S2>1, wherein S1 is the surface area of falling polyalkylene terephthalate, and S2 is the area where the support is in contact with polyalkylene terephthalate.
摘要翻译:本发明提供一种聚对苯二甲酸亚烷基酯的制造方法,其特征在于,包括:引入聚对苯二甲酸亚烷基酯的预聚物,所述聚对苯二甲酸亚烷基酯处于熔融状态,所述聚对苯二甲酸亚烷基酯包含70摩尔% eta]为0.2-2d / g,通过聚合反应器的进料口; 从多孔板的孔排出引入的预聚物; 并且在减压下聚合预聚物,同时允许预聚物在预聚物的[结晶熔点-10℃]之间或更高的[温度]之间的温度沿着向外开口的载体表面落下 熔点+ 30℃],或者在由式S 1 / S 2 SUB> 1表示的条件下更低,其中S 1, SUB>是下降的聚对苯二甲酸亚烷基酯的表面积,S 2 O 2是支撑体与聚对苯二甲酸亚烷基酯接触的区域。
摘要:
The present invention provides a flame-retardant resin composition which comprises 100 parts by weight of a thermoplastic resin (A) and 0.1 to 30 parts by weight of one or more of organic phosphorus compounds (B) represented by the following formula (1) ##STR1## wherein X is ##STR2## R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent a phenyl group or a xylyl group with at least one being a phenyl group and at least one being a xylyl group, and n is a positive integer.The flame-retardant resin composition of the present invention is excellent in heat resistance, impact strength in the form of thin-walled moldings and blooming-free property on the surface of articles molded therefrom.
摘要:
Malononitrile is prepared in a high yield by catalytic oxidative dehydrogenation of .beta.-aminopropionitrile in a gaseous phase with molecular oxygen in the presence of a catalyst, comprising a oxide composition of, preferably, Mo and at least one other catalytic element, more preferably, of the empirical formula (I):Mo.sub.12 Bi.sub.0.1-24 A.sub.a B.sub.b C.sub.c D.sub.d O.sub.x (I)wherein A=Fe and/or Cr, B=Ni, Co, Mn and/or Mg, C=alkali metals, alkaline earth metals, rare earth metals, Te, Tl, W and/or Pb, a=0.1-24, b=0-24, c=0-2 and d=0-5.
摘要:
A hinge device of a plane monitor is capable of manually rotating a plane display in lateral horizontal direction, manually inclining (tilting, laying) in longitudinal direction, or manually adjusting the height in vertical direction, being simple in structure and easy in manual operation. The structure includes a mechanism for supporting a plane display in lower part, and rotating it manually in lateral horizontal direction, in which the rotary mechanism in the lateral horizontal direction includes horizontal rotary position holding means, and transmitting means for transmitting rotary motion in lateral horizontal direction of the plane display to the horizontal rotary position holding means.
摘要:
According to one embodiment, a developing agent includes a toner resin containing a coloring material, a binder resin, an ester wax and a crystalline polyester resin. The ester wax has an alkyl group with a carbon number of from 32 to 46, when an ion intensity ratio at each carbon number is expressed in terms of percentage, a content of an ester compound having a carbon number showing its maximum intensity ratio is from 20 to 55% by weight of the whole of the wax, and a content of ester compounds with a carbon number of not more than 38 is not more than 10% by weight of the whole of the wax. The ester wax has an endothermic peak measured by DSC of from 60 to 75° C. The crystalline polyester resin has an endothermic peak measured by DSC of from 90 to 110° C.
摘要:
According to one embodiment, there is provided a developing agent including a toner particle containing a coloring agent, a binder resin and an ester wax having an alkyl group having a carbon number of from 32 to 46. When the wax is analyzed by an mass spectrometry, an ester compound having a carbon number showing the maximum strength ratio accounts for from 20 to 45% by mass of the whole of the wax.