QUATERNARY AMMONIUM SALT-CONTAINING CATALYST FOR DISSOCIATION OF BLOCKING AGENT AND USE THEREOF
申请人:TOSOH CORPORATION
公开号:US20150344727A1
公开(公告)日:2015-12-03
A catalyst containing a quaternary ammonium salt represented by the following general formula (1) is used as a catalyst for dissociation of a blocking agent.
[In the formula, each of R
1
to R
3
represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 14 carbon atoms; R
4
represents an aliphatic hydrocarbon group having 9 to 20 carbon atoms; X represents at least one member selected from the group consisting of a phosphate group, a borate group, a hydrogencarbonate group, a monoalkylcarbonate group and a carbonate group; a is an integer in the range of 1 to 3; and b is an integer in the range of 1 to 3.]
Method for Producing Fluorine-Containing Cyclopropane Carboxylic Acid Compound
申请人:CENTRAL GLASS COMPANY, LIMITED
公开号:US20180186763A1
公开(公告)日:2018-07-05
The present invention provides an industrially applicable method for production of a fluorine-containing cyclopropane carboxylic acid compound useful as an intermediate for pharmaceutical and agrichemical products. A fluorine-containing cyclopropane monoester is obtained by: forming a fluorine-containing cyclic sulfate with the use of a fluorine-containing dial compound and sulfuryl fluoride (as a cyclic sulfuric esterification step); reacting the fluorine-containing cyclic sulfate with a malonic diester, thereby forming a fluorine-containing cyclopropane diester (as a cyclopropanation step); and hydrolyzing the fluorine-containing cyclopropane diester (as a hydrolysis step). The fluorine-containing cyclopropane carboxylic acid compound, such as fluorine-containing cyclopropane monoester or its salt, can be obtained with high chemical and optical purity by mixing the fluorine-containing cyclopropane monoester with an amine and subjecting the resulting salt of the fluorine-containing cyclopropane monoester and amine to recrystallization purification.
The present invention relates to a substance-supporting porous silica, wherein a porous silica supports a substance selected from the group consisting of menthols, volatile substances, thermal substances, plant polyphenols and organic colorants.
To provide a curable composition which has a high curing rate and can provide a cured product having good durability.
A curable composition comprising an oxyalkylene polymer (A) having a reactive silicon group represented by the following formula (1), and a quaternary ammonium salt (B):
—SiX
1
a
R
1
3-a
(1)
wherein R
1
is a C
1-20
monovalent organic group which may have a substituent, X
1
is a hydroxyl group or a hydrolyzable group, and a is an integer of from 1 to 3; provided that when plural R
1
s are present, they may be the same or different from one another, and when plural X
1
s are present, they may be the same or different from one another.
Process for the production of aromatic polycarbonate
申请人:TEIJIN LIMITED
公开号:EP0667366A2
公开(公告)日:1995-08-16
A process for the production of an aromatic polycarbonate, which comprises polycondensing an aromatic dihydroxy compound and a diaryl carbonate in the presence, as a polycondensation catalyst, of at least one alkali metal salt selected from the group consisting of alkali metal salts of ate-complexes of a metal element, which is silicon, germanium, stannum or plumbum, and alkali metal salts of oxoacids of said metal elements. The above aromatic polycarbonate is almost free from being colored, is also almost free from a decrease in polymerization degree when molded, and is further almost free from forming branches and insolubles.