77results about How to "Good repeat stability" patented technology

An arylamine compound represented by formula (I). Ar1 represents a phenyl group substituted by a substituted or unsubstituted monovalent polycyclic aromatic hydrocarbon group, and a substituted or unsubstituted monovalent heterocyclic group. Ar2 represents a substituted or unsubstituted arylene group. R1 represents a hydrogen atom, a halogen atom, an alkoxy group, or a substituted or unsubstituted alkyl group. R2 represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group. R3 and R4 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, at least one of R3 and R4 represents a substituted or unsubstituted aryl group, and R3 and R4 may be bound to form a ring via a single bond or a divalent group m represents an integral of from 0 to 4.

Disclosed is a compound having excellent electron transporting ability, which is useful for electrophotographic photosensitive bodies or organic EL devices. Also disclosed is a highly sensitive, positive charge type electrophotographic photosensitive body for copying machines and printers, wherein the novel organic material is used as a charge-transporting material in a photosensitive layer. Further disclosed is an electrophotographic apparatus using such a positive charge type electrophotographic photosensitive body. Specifically disclosed is a novel quinone compound having a structure represented by the general formula (I) below. Also specifically disclosed is an electrophotographic photosensitive body having a photosensitive layer formed on a conductive base and containing a charge-generating material and a charge-transporting material, wherein the photosensitive layer contains at least one of the above-described compounds.

Provided are a composite catalytic membrane for catalyzing an esterification reaction and a preparation method thereof. The composite catalytic membrane has a porous structure, with non-woven fabric as the base film, and a catalytic coating is compounded on the surface of the non-woven fabric and in the pores and gaps of the non-woven fabric fibers. The catalytic coating uses a solid acid as a catalyst to polymerize Compound or modified sulfonated polymer is used as film-forming material, and the film is formed by coating method or impregnation method, and after forming, it is cross-linked to obtain a composite catalytic membrane. Utilizing the microporous structure and developed specific surface of the composite catalytic membrane, the catalytic esterification and the greening and high efficiency of the biodiesel preparation process are realized. The composite catalytic membrane has high mechanical strength and good repetition stability, and is easy to realize the continuous production repetition of the catalytic esterification process. The preparation process is simple and easy to control and scale up.

The invention discloses a polycarboxylic acid water reducing agent for gypsum and a preparation method thereof. The water reducing agent is prepared by copolymerizing unsaturated polyoxyalkylene base ether monomers, unsaturated monocarboxylic acid and derivative monomers thereof, and other monomers capable of being copolymerized with those monomers in a radical polymerization system. The gypsum water reducing agent has the advantages of high water-reducing rate, no delayed coagulation and the like, and the preparation method has the advantages of low energy consumption, high efficiency and good repeatability and stability.

The invention relates to the field of olefin polymerization, and specifically provides a catalyst component used for olefin polymerization and a preparation method and application thereof. The preparation method comprises a step of subjecting a magnesium halide adduct, a titanium compound and an aromatic carboxylate compound to a contact reaction. The magnesium halide adduct is prepared through the following steps: (1) mixing aquo MgX1Y, R1OH and an alkoxy benzoyl compound and heating the obtained mixture so as to obtain a liquid magnesium halide adduct, or mixing anhydrous MgX1Y, R1OH, the alkoxy benzoyl compound and water and heating the obtained mixture so as to obtain the liquid magnesium halide adduct; and (2) allowing the liquid magnesium halide adduct to penetrate through a structural unit with holes to a liquid cooling medium under the action of pressure in the presence of an inert liquid medium, and carrying out quenching formation and drying. The invention provides a catalyst system used for olefin polymerization and application thereof, and an olefin polymerization method. The catalyst component synthesized from an adduct carrier prepared by using the method has improved hydrogen sensitivity when used for olefin polymerization.

The present invention relates to an electrochromic polymer compound composed of a hyperbranched polymer having electrochromic characteristics derived from a quaternary pyridinium salt, a terephthalic acid diester or a biphenyl-4,4′-diester structure, and a varnish, a thin film structure and an electrochromic device that are obtained by the polymer compound. The electrochromic material has high response speed, high coloring efficiency, and excellent repetition stability and can be used for a long time, and has excellent solubility in various solvents.