The present invention relates to a method of producing an optically active cyanohydrin derivative, which comprises reacting an aldehyde or an asymmetrical ketone with a cyanating agent in the presence of a Lewis base and a titanium compound produced from a partial hydrolysate of titanium tetraalkoxide and an optically active ligand represented by formula (II) or a titanium oxoalkoxide compound represented by formula (I) [Ti
x
O
y
](OR
1
)
4x-2y
, and an optically active ligand represented by formula (II), wherein R
1
is an optionally substituted alkyl group or an optionally substituted aryl group; x is an integer of not less than 2; y is an integer of not less than 1; and y/x satisfies 0.1
本发明涉及一种制备光学活性氰醇衍生物的方法,包括在Lewis碱和由钛四烷氧化物的部分水解物和式(I)[TixOy](OR1)4x-2y,以及由式(II)表示的光学活性配体组成的钛氧烷衍生物的存在下,将醛或不对称酮与氰化试剂反应。其中,R1是可选的取代基的烷基或芳基;x为不小于2的整数;y为不小于1的整数;且y/x满足0.1
Method for producing adhesive polyacrylates using mercapto functional photoinitiators
申请人:——
公开号:US20040049972A1
公开(公告)日:2004-03-18
A process for preparing pressure-sensitively adhesive polyacrylates by free-radical addition polymerization, characterized in that mercapto-functionalized photoinitiators of the general formula (I) and/or (II).
H—S—R (I)
R—S—S—R′ (II)
are added to the monomer mixture or to the reaction mixture, R and R′ being chosen independently of one another from the following groups:
a) benzophenone, acetophenone, benzil, benzoin, hydroxyalkylphenone, phenylcyclohexyl ketone, anthraquinone, thioxanthone, triazine, or fluorenone radicals, it being possible for each of these radicals to be substituted by one or more halogen atoms and/or one or more alkoxy groups and/or one or more amino groups or hydroxyl groups,
b) radicals which comprise one or more of the substituted or unsubstituted radicals specified under a).
一种通过自由基加成聚合制备压敏粘合剂聚丙烯酸酯的方法,其特征在于向单体混合物或反应混合物中添加通式(I)和/或(II)的巯基功能化光引发剂。其中R和R'分别独立地选择以下基团:a)苯基酮,乙酰苯,苯并二酮,苯并酚,羟基烷基苯酮,苯基环己基酮,蒽醌,噻吩酮,三嗪或芴酮基团,每个基团都可以被一个或多个卤素原子和/或一个或多个烷氧基团和/或一个或多个氨基或羟基团取代,b)包括在a)中指定的一个或多个取代或未取代基团的基团。
Synthesis of hypervalent iodine reagents with dioxygen
申请人:The Texas A&M University System
公开号:US10487099B2
公开(公告)日:2019-11-26
Methods of synthesis of hypervalent iodine reagents and methods for oxidation of organic compounds are disclosed.
公开了超价碘试剂的合成方法和有机化合物的氧化方法。
Continuous two-stage preparation of solvent-free polyacrylate hotmelt PSAs
申请人:——
公开号:US20040024111A1
公开(公告)日:2004-02-05
In a continuous two-stage process for preparing solvent-free polyacrylate hotmelt pressure sensitive adhesives which is gentle on the polymer and redeploys the solvent used in the process the following steps are carried out:
polymerizing a self-adhesive pressure sensitive adhesive in solution, the solvent having a low vapor pressure;
continuously mixing the polymer solution with antioxidants and preheating the mixture under superatmospheric pressure without boiling it;
concentrating the polymer solution to a residual solvent content of less than 0.1% by weight in a concentrating extruder under the effect of reduced pressure and elevated temperatures;
condensing, collecting, and re-using the solvent stripped off in the extruder;
compounding the abovementioned solvent-freed hotmelt pressure sensitive adhesive with tackifying resins, fillers, stabilizers, crosslinkers or other additives in a second extruder at a moderate melt temperature;
transferring the blended solvent-free self-adhesive pressure sensitive adhesive to a downstream coating unit.
在制备无溶剂聚丙烯酸酯热熔压敏胶的连续两阶段工艺中,对聚合物温和,并重新利用了工艺中使用的溶剂:
在溶液中聚合自粘性压敏胶,溶剂的蒸汽压较低;
将聚合物溶液与抗氧化剂持续混合,在超大气压下预热混合物,但不使其沸腾;
在减压和升温的作用下,在浓缩挤压机中将聚合物溶液浓缩至残留溶剂含量小于 0.1%(按重量计);
冷凝、收集和再利用挤压机中剥离的溶剂;
将上述无溶剂热熔压敏胶与增粘树脂、填料、稳定剂、交联剂或其他添加剂在中等熔融温度下在第二挤压机中混合;
将混合后的无溶剂自粘压敏胶输送到下游涂覆装置。
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