摘要:
A high purity phosphoric acid, characterized in that it has an impurity content wherein the content of Sb is 200 ppb or less and the content of a sulfide ion is 200 ppb or less, in terms of a product having a H3PO4 concentration of 85 wt %. The above high purity phosphoric acid is useful as an etching fluid for a semiconductor element having a silicon nitride film, an etching fluid for a liquid crystalline display panel having an alumina film, an etching fluid for metallic aluminum, an etching fluid for alumina for a ceraminc, a material of a phosphate glass for an optical fiber glass, a food additive and the like.
摘要:
A phosphorus-containing epoxy resin comprising structural units derived from a secondary phosphine derivative represented by the following general formula (1) or (2); and a phosphorus-containing epoxy resin composition comprising the phosphorus-containing epoxy resin and either a hardener or a polymerization initiator. (1) (In the formula, R represents optionally substituted alkylene and X represents oxygen or sulfur.) (2) (In the formula, R represents optionally substituted cycloalkylene or arylene and X represents oxygen or sulfur.)
摘要:
Phosphorus-containing hydroquinone derivatives of the general formula (1) useful as reactive flame retardants or intermediate raw materials for the production of phosphorus-containing epoxy resins wherein R?1 and R2¿ are each independently linear or branched alkyl, or alternatively R?1 and R2¿ may be united to form a ring; X is oxygen or sulfur; and Y and Z are each hydrogen, hydroxyl, linear or branched alkyl, aralkyl, alkoxy, allyl, aryl, or cyano, or alternatively Y and Z may be united to form a ring.
摘要:
A rust-preventive pigment composition characterized by containing a white rust-preventive pigment and an inorganic anion exchanger of the general following formula (1): (3 SIMILAR 4) [M1]O.A12O3. [M2] X2/m.nH2O (wherein M1 and M2 are each at least either Ca or Zn ; X is at least one anion selected from among NO2 , NO3 and MO4 ; m is a valence of the anion; and n is 20 or less) as the main components.
摘要:
A novel bisphosphine compound represented by formula (1): (wherein t-C8H17 represents 1,1,3,3-tetramethylbutyl), which has asymmetric centers at the phosphorus atoms and is useful as the ligand of asymmetric catalysts for asymmetric hydrogenation; a process for the preparation thereof; transition metal complexes containing the compound as the ligand; and processes for the asymmetric hydrogenation of unsaturated carboxylic acids and esters thereof by using the complexes as the asymmetric catalyst.
摘要:
An industrially advantageous process for producing 3-chloromethyl-3-cephem derivative crystals. The process for 3-chloromethyl-3-cephem derivative production comprises: a first step in which a thiazolineazetidinone derivative (1) is reacted with a sulfonyl halide (2) in the presence of an acid in a solvent to obtain an azetidinone derivative (3); a second step in which the azetidinone derivative (3) is reacted with a chlorinating agent in an organic solvent to obtain a chlorinated azetidinone derivative (4); and a third step in which the chlorinated azetidinone derivative (4) is reacted with an alcoholate (5) at a pH of 8 or lower in a solvent comprising an alcohol and an ether and a 3-chloromethyl-3-cephem derivative (6) is recovered in the form of crystals.
摘要:
A conductive electrolessly plated powder used, for example, for bonding a small electrode of an electronic device, its producing method, and a conductive material containing the plated powder. Conventionally, there has been known, as conductive powders, metallic powders such as of nickel, carbon powders, and conductive plating powders the resin core particles of which are coated with a metal, e.g., nickel. However, there has been no conductive electrolessly plated powders having a good conductivity with respect to connection between conductive patterns having an oxide coating thereon or between electrodes and no methods for producing such powders industrially. The conductive electrolessly plated powder of the present invention consists of resin spherical core particles the average size of which is 1 to 20 mu m and each of which has a nickel or nickel alloy coating formed by electroless plating. The coating includes small projections of 0.05 to 4 mu m on its outermost layer and the coating is substantially continuous with the small projections. A method of producing such a powder is also disclosed.