Abstract: A lubricating oil composition for diesel engines, particularly a composition with low ashes and no metals. The lubricating oil composition has exceedingly high detergency and excellent antiwear so that it is suitably used for diesel engines equipped with an apparatus for after-treatment of exhaust gas. The lubricating oil composition contains a lubricating base oil which includes a component (A): 2 to 30% by mass, based on the total amount of the composition, of a succinimide compound having an alkenyl group or an alkyl group of a number average molecular weight of 80 to 500 or a boronic compound thereof; and a component (B): 0.5 to 30% by mass, based on the total amount of the composition, of a succinimide compound having an alkenyl group of a number average molecular weight of 800 to 3,500 or a boronic compound thereof.

Abstract: A lubricating oil composition for diesel engines, particularly a composition with low ashes and no metals. The lubricating oil composition has exceedingly high detergency and excellent antiwear so that it is suitably used for diesel engines equipped with an apparatus for after-treatment of exhaust gas. The lubricating oil composition contains a lubricating base oil which includes a component (A): 2 to 30% by mass, based on the total amount of the composition, of a succinimide compound having an alkenyl group or an alkyl group of a number average molecular weight of 80 to 500 or a boronic compound thereof; and a component (B): 0.5 to 30% by mass, based on the total amount of the composition, of a succinimide compound having an alkenyl group of a number average molecular weight of 800 to 3,500 or a boronic compound thereof.

Abstract: A novel aromatic compound represented by following general formula (I): among X1 to X20 in general formula (I), (1) at least four each independently represent a linear or branched alkoxyl group having 1 to 6 carbon atoms, and others each represent hydrogen atom; (2) at least one represents a linear or branched alkyl group having 1 to 6 carbon atoms, at least one represents a linear or branched alkoxyl group having 1 to 6 carbon atoms, a total of a number of the alkyl group and a number of the alkoxyl group being 4 or greater, and others each represent hydrogen atom; (3) at least six each independently represent a linear or branched alkyl group having 1 to 6 carbon atoms, and others each represent hydrogen atom; or (4) at least four each independently represent a linear or branched alkyl group having 1 to 6 carbon atoms, two among said alkyl groups having 3 to 6 carbon atoms, and others each represent hydrogen atom; and an organic electroluminescence device using the aromatic compound, are provided.

Abstract: There is disclosed a process for removing volatile components in a polyarylene sulfide resin which is produced by subjecting a sulfur source and a dihalogenated aromatic compound to polymerization reaction in an aprotic organic solvent, comprising using an extruder which is equipped with front vent having an opening length in the range of 4D to 11D (D: screw diameter) and which has a distance between a terminal position of a screw in a kneading portion and the opening portion of the front vent being in the range of 4D to 15D. The process is capable of steadily and economically removing volatile components in the polyarylene sulfide resin without necessitating expensive machinery or equipment such as a dryer without plugging up the opening portion of a vent even in the case of degassing a PAS resin having a low molecular weight and further, thus enabling a long-term continuous stable running.

Abstract: There are disclosed a process for producing a polyarylene sulfide through polymerization condensation of a sulfur source and a dihalogenated aromatic compound by using a polymerization vessel equipped with baffles that are asymmetrically arranged in the polymerization vessel or in the form of round bar, or by using a polymerization vessel equipped with an agitational blade which is devoid of a notch in the vicinity of the tip portion of the blade, and is in such a configuration as substantially equalizing the spacing between the tip portion thereof and the opposite bottom portion and/or end portion of the polymerization vessel all over the tip portion thereof; and an apparatus used for the process. The process and apparatus enables to form a uniform dispersion state of polymer phase in the vessel and to produce polyarylene sulfide having a high molecular weight.