A method is provided for preparing a low temperature thermosetting polyarylene sulfide having significantly low crystallinity while maintaining a low melt flow rate at a high polymerization yield, so as to ensure excellent laser welding property and mechanical properties even when used in a molded product on the transmitting side of laser beam by a laser welding method.

A method is provided for preparing a low temperature thermosetting polyarylene sulfide having significantly low crystallinity while maintaining a low melt flow rate at a high polymerization yield, so as to ensure excellent laser welding property and mechanical properties even when used in a molded product on the transmitting side of laser beam by a laser welding method.

Provided is a method for producing a polyarylene sulfide resin, the method including subjecting a dihaloaromatic compound and a sulfidizing agent to a polymerization reaction in the presence of an aliphatic cyclic compound having a ring openable by hydrolysis, in which corrosion of a production apparatus is suppressed. More particularly, provided is a method for producing a polyarylene sulfide resin, the method including a dehydration step (1) in which a water-containing sulfidizing agent and an aliphatic cyclic compound having a ring openable by hydrolysis are heated in the presence of a dihaloaromatic compound to a liquid temperature in the range of 90° C. or higher and 170° C. or lower under the atmospheric pressure, and then dehydration is performed while maintaining the liquid temperature and reducing the pressure to a pressure in the range of 30 [kPa abs] or higher and 80 [kPa abs] or lower to thus obtain a mixture.

Provided is a method for producing a polyarylene sulfide resin, the method including subjecting a dihaloaromatic compound and a sulfidizing agent to a polymerization reaction in the presence of an aliphatic cyclic compound having a ring openable by hydrolysis, in which corrosion of a production apparatus is suppressed. More particularly, provided is a method for producing a polyarylene sulfide resin, the method including a dehydration step (1) in which a water-containing sulfidizing agent and an aliphatic cyclic compound having a ring openable by hydrolysis are heated in the presence of a dihaloaromatic compound to a liquid temperature in the range of 90° C. or higher and 170° C. or lower under the atmospheric pressure, and then dehydration is performed while maintaining the liquid temperature and reducing the pressure to a pressure in the range of 30 [kPa abs] or higher and 80 [kPa abs] or lower to thus obtain a mixture.

The present disclosure relates to a preparation method of a polyarylene sulfide, and this method may produce a polyarylene sulfide having properties equal to or higher than those of the conventional method at a high yield by using a dihalogenated aromatic compound in a predetermined equivalent ratio with respect to a sulfur compound and performing both dehydration and polymerization under optimum conditions.

The present disclosure relates to a preparation method of a polyarylene sulfide, and this method may produce a polyarylene sulfide having properties equal to or higher than those of the conventional method at a high yield by using a dihalogenated aromatic compound in a predetermined equivalent ratio with respect to a sulfur compound and performing both dehydration and polymerization under optimum conditions.

Embodiments of the disclosure generally provide methods related to articles that display reversible photoresponsive behavior.

The present application relates to a method for extracting coenzyme Q10 and a phospholipid from a coenzyme Q10 fermentation bacterium powder. The method is characterized in that the fermentation bacterium powder of a coenzyme Q10 production strain is subjected to extraction with a mixed solvent of which the three-dimensional Hansen solubility parameter is between 21 and 23 (J/cm.sup.3).sup.1/2 and the hydrogen bonding solubility parameter thereof is between 10 and 12 (J/cm.sup.3).sup.1/2. The present invention can efficiently extract two products, namely coenzyme Q10 and a phospholipid, from the coenzyme Q10 fermentation bacterium powder; the process thereof is highly operable, easy to be industrialized, and can provide a product with high purity and yield, having great economic benefit.

The present application relates to a method for extracting coenzyme Q10 and a phospholipid from a coenzyme Q10 fermentation bacterium powder. The method is characterized in that the fermentation bacterium powder of a coenzyme Q10 production strain is subjected to extraction with a mixed solvent of which the three-dimensional Hansen solubility parameter is between 21 and 23 (J/cm.sup.3).sup.1/2 and the hydrogen bonding solubility parameter thereof is between 10 and 12 (J/cm.sup.3).sup.1/2. The present invention can efficiently extract two products, namely coenzyme Q10 and a phospholipid, from the coenzyme Q10 fermentation bacterium powder; the process thereof is highly operable, easy to be industrialized, and can provide a product with high purity and yield, having great economic benefit.

The present invention relates to a polyarylene sulfide-based resin composition, which has excellent thermal conduction efficiency in the horizontal and vertical directions and excellent mechanical properties such as tensile strength and impact strength, and to a molded article thereof.