A new method for the preparation of alkyl vinyl ethers has been developed. Thus, various types of alkyl vinyl ethers were synthesized by the reaction of alcohols with vinyl acetate under the influence of a catalytic amount of [Ir(cod)Cl]2 combined with Na2CO3 in good to excellent yields.
Polymerizable composition, optical material comprising the composition and method for producing the material
申请人:——
公开号:US20040254258A1
公开(公告)日:2004-12-16
A cured matter obtained by polymerizing and curing a polymerizable composition comprising a compound having at least one episulfide in a molecule is reduced in an odor by adding a perfume to the polymerizable composition comprising the compound having at least one episulfide in a molecule.
A cloudiness of the lens is removed by raising a purity of sulfur to 98% or more.
A reduction in a chlorine content of the sulfur compound described above to 0.1% by weight or less elevates an oxidation resistance and a light fastness of the high refractive index optical material and improves a color tone thereof.
An optical product having a high refractive index and a high-degree transparency is provided by subjecting the composition in advance to deaerating treatment at 0 to 100° C. for one minute to 24 hours under a reduced pressure of 0.001 to 50 torr.
DEVELOPING SOLUTION FOR LITHOGRAPHIC PRINTING PLATES AND PRODUCTION METHOD OF LITHOGRAPHIC PRINTING PLATE
申请人:ADACHI Keiichi
公开号:US20080081295A1
公开(公告)日:2008-04-03
A developing solution containing at least one of compounds represented by the formulae <1>, <2> and <3> as defined herein, and having a pH of from 2 to 10; and a method for producing a lithographic printing plate, including imagewise exposing a lithographic printing plate precursor including an image recording layer and a support to cure the image recording layer in the exposed area, and developing the exposed lithographic printing plate precursor with an aqueous solution containing at least one of the compounds represented by the formulae <1>, <2> and <3> as defined herein and having a pH of 2 to 10 are provided.
The composition for optical materials of the present invention contains at least one compound represented by the following Formula 1:
wherein R1, R2 and R3 are each independently C1-C10 hydrocarbyl or hydrogen; X1, X2 and X3 are each independently S, Se or Te; Y1, Y2 and Y3 are each independently -Sa-[(CH2)bS]cH, a is an integer from 0 to 2, b is an integer from 0 to 4, and c is an integer from 0 to 2, and a compound reactive to the compound of Formula 1. A resin produced by curing a composition containing the compound of Formula 1 by polymerization has a high refractive index, and suitable as various optical materials.
POLYMERIZABLE COMPOSITION, OPTICAL MATERIAL COMPRISING THE COMPOSITION AND METHOD FOR PRODUCING THE MATERIAL
申请人:MITSUBISHI GAS CHEMICAL COMPANY, INC.
公开号:EP1524289A1
公开(公告)日:2005-04-20
A cured matter obtained by polymerizing and curing a polymerizable composition comprising a compound having at least one episulfide in a molecule is reduced in an odor by adding a perfume to the polymerizable composition comprising the compound having at least one episulfide in a molecule.
A cloudiness of the lens is removed by raising a purity of sulfur to 98 % or more.
A reduction in a chlorine content of the sulfur compound described above to 0.1 % by weight or less elevates an oxidation resistance and a light fastness of the high refractive index optical material and improves a color tone thereof.
An optical product having a high refractive index and a high-degree transparency is provided by subjecting the composition in advance to deaerating treatment at 0 to 100°C for one minute to 24 hours under a reduced pressure of 0.001 to 50 torr.