The alkylation of aromatic compounds with aldehydes and ketones in
the presence of a variety of metal cation-exchanged montmorillonites
(Mn+-mont;
Mn+ = Zr4+,
Al3+, Fe3+, Zn2+, H+,
Na+) has been investigated. Al3+- and
Zr4+-Monts are revealed to be effective as catalysts, while
no reaction takes place with Na+-mont.
Al3+-Mont-catalysed alkylation of phenol with several
aldehydes produces mainly or almost solely the corresponding
gem-bis(hydroxyphenyl)alkanes (bisphenols) in good yields, while that
with several ketones affords selectively the corresponding alkylphenols
in moderate to good yields. The alkylation always occurs at the carbonyl
carbon without any skeletal rearrangement and the kind of products
depends much on the steric hindrance of an electrophilic intermediary
carbocation. The alkylation of anisole, veratrole and p-cresol
proceeds well, while that of toluene, benzene, chlorobenzene and
nitrobenzene scarcely occurs.
POLYCARBONATE RESIN COMPOSITION AND FORMED PRODUCT THEREOF
申请人:Monden Toshiki
公开号:US20110245388A1
公开(公告)日:2011-10-06
In a polycarbonate resin composition containing a polycarbonate resin and a polycarbosilane compound, the use of the polycarbosilane compound modifies the surface properties of the polycarbonate resin composition without adversely affecting the intrinsic characteristics of the polycarbonate resin, such as transparency, heat resistance, and mechanical properties, e.g., impact resistance. A polycarbonate resin composition containing 100 parts by mass of a polycarbonate resin, 0.001 to 1 part by mass of a metal salt compound, and 0.005 to 5 parts by mass of a polycarbosilane compound has significantly improved flame resistance and high transparency and causes markedly reduced outgassing and mold fouling, without losing impact resistance and heat resistance.
Yellow Thermochromic Dyes, Inks Composition And Level Indicators
申请人:Chromatic Technologies, Inc.
公开号:US20160333210A1
公开(公告)日:2016-11-17
A new leuco dye produces a yellow color while demonstrating also exceptional light and thermal stability under light.
一种新的白色染料产生黄色,同时在光照下表现出卓越的光和热稳定性。
[EN] RED THERMOCHROMIC DYES AND THEIR INK COMPOSITIONS<br/>[FR] COLORANTS THERMOCHROMIQUES ROUGES ET COMPOSITIONS D'ENCRE CORRESPONDANTES
申请人:CHROMATIC TECH INC
公开号:WO2015048536A1
公开(公告)日:2015-04-02
A red leuco dye demonstrates unusually good thermal and photo stability. The red dye may be used with developers and wax carries for microencapsulation to form thermochromic pigments for use in inks, coatings and the like. This pigment is particularly desirable for use in metal-deco coatings, such as those used in aluminum cans in high beverage canning operations.
There are provided a thermochromic opaque composition capable of exhibiting change in transparency together with change in color in response to temperature variation, a laminate member employing the same, and a three-dimensional article capable of concealing and revealing the interior, utilizing the laminate member.
The thermochromic opaque composition is formed by dispersing a thermochromic material, capable of developing and erasing color by an electron donating-accepting reaction, in small particles in vinyl chloride-vinyl acetate matrix resin.
The above-mentioned structure realizes reversible change in transparency, together with change in color, in response to temperature variation, with hysteresis with a temperature difference of 10°C at minimum to 50°C between the high and low trigger temperatures.