Method for increasing color-fastness of organic coloring matter
申请人:KONICA CORPORATION
公开号:EP0216598A2
公开(公告)日:1987-04-01
A method for increasing color-fastness of organic coloring matters against light is disclosed, the color-fastness of the organic coloring matter of which absoption maximum is the region from 400nm to 700nm is increased by coexisting with a metal complex represented by the following general formula:
in which R1, R2, R1' and R2' are a hydrogen atom or a substituent, X and X' are O or S, Y is O, S, SO or SO2 and M is a metal atom.
The method adapts to improve the fastness of color images of silver halide photographic materials. In this case, the organic coloring matter is a dyestuff formed by coupling a color forming coupler with an oxidation product of a color developing agent in the silver halide color photographic material or a dyestuff diffused to a recieving layer of the diffusion transfer silver halide color photographic material.
Olefin polymerisation catalysts and processes for producing olefin polymers
申请人:TOSOH CORPORATION
公开号:EP0849292A1
公开(公告)日:1998-06-24
Catalysts for olefin polymerization which consist essentially of a transition metal compound, a modified clay compound and an organic aluminum compound, wherein the modified clay compound comprises a reaction product of a clay mineral and a proton acid salt of a specific amine compound, as well as a method of polymerizing olefins using such catalysts. It is possible thereby to obtain olefin polymers with high productivity and low ash content.
POLYMERIZATION CATALYST FOR POLYTHIOURETHANE OPTICAL MATERIAL, POLYMERIZABLE COMPOSITION CONTAINING THE CATALYST, POLYTHIOURETHANE RESIN OBTAINED FROM THE COMPOSITION, AND METHOD FOR PRODUCING THE RESIN
申请人:Mitsui Chemicals, Inc.
公开号:EP2065414A1
公开(公告)日:2009-06-03
By using an amine hydrochloride represented by the formula (1) as a catalyst, a polythiourethane resin which is suitably used for a transparent resin for optical use, can be obtained without using an organotin compound which has been conventionally used as a catalyst for polythiourethane resins and without being affected by the acidity of an additive:
wherein R1, R2 and R3 independently represent a monovalent or higher valent linear aliphatic, branched aliphatic, cyclic aliphatic or aromatic organic residue which may have a hydroxyl group or an amino group; and R1, R2 and R3 may be arbitrarily bonded to each other to form a ring.