Method for the production of poly(3-hydroxyalkanoates) in the presence of a nucleophile
    31.
    发明申请
    Method for the production of poly(3-hydroxyalkanoates) in the presence of a nucleophile 失效
    在亲核试剂存在下生产聚(3-羟基链烷酸酯)的方法

    公开(公告)号:US20050107573A1

    公开(公告)日:2005-05-19

    申请号:US10505707

    申请日:2003-02-26

    CPC分类号: C08G63/823 C08G63/08

    摘要: The invention relates to a catalytical process for preparing poly(3-hydroxyalkanoates) by copolymerizing an oxirane compound with carbon monoxide in the presence of a) at least one single- or multicenter neutral transition metal complex (A) based on a metal of groups 5 to 11 of the Periodic Table of the Elements, in which the metal center(s) is/are present in the formal oxidation state 0, and/or b) at least one single- or multicenter anionic transition metal complex (B) based on a metal of groups 5 to 11 of the Periodic Table of the Elements, where multicenter transition metal complexes have metal centers which, without exception, are of the same transition metal, which comprises carrying out the copolymerization in the presence of at least one nucleophile other than hydroxy-substituted pyridine compounds.

    摘要翻译: 本发明涉及通过在a)至少一种基于5族金属的单中心或多中心中性过渡金属络合物(A)的存在下将环氧乙烷化合物与一氧化碳共聚来制备聚(3-羟基链烷酸酯)的催化方法 至元素周期表中的11个,其中金属中心以形式氧化态0存在,和/或b)至少一种单或多中心阴离子过渡金属络合物(B),基于 元素周期表第5至11组的金属,其中多中心过渡金属络合物具有金属中心,无一例外是相同的过渡金属,其包括在存在至少一种亲核试剂的情况下进行共聚 比羟基取代的吡啶化合物。

    Linear, isotactic polymers, process for preparing same, and use thereof
    33.
    发明授权
    Linear, isotactic polymers, process for preparing same, and use thereof 失效
    线性全同立构聚合物,其制备方法及其用途

    公开(公告)号:US06790922B2

    公开(公告)日:2004-09-14

    申请号:US10378361

    申请日:2003-03-03

    申请人: Bernhard Rieger

    发明人: Bernhard Rieger

    IPC分类号: C08F1006

    摘要: The invention refers to a linear, isotactic polymer which has a structure of one or several C2 to C20 olefins, of which the isotacticity, due to a statistic distribution of stereoscopic errors in the polymer chain, is within the range of from 25 to 60% of [mmmm] pentad concentration with the proviso that an arbitrary or rather regular sequence of isotactic and atactic blocks is excluded, the polymer having a mean molecular weight Mw within the range of from 100,000 to 800,000 gms/mol and a TG of from −50 to +30.

    摘要翻译: 本发明涉及具有1个或多个C2〜C20烯烃结构的直链全同立构聚合物,由于聚合物链中的立体误差的统计分布,其全同立构规整度在25〜60%的范围内, [mmmm]五单元组浓度,条件是排除任意或相当规则的全同立构和无规立构嵌段序列,聚合物的平均分子量Mw在100,000至800,000gms / mol的范围内,TG为-50 至+30。

    Nematic liquid crystal mixtures and a matrix liquid crystal display
    34.
    发明授权
    Nematic liquid crystal mixtures and a matrix liquid crystal display 失效
    向列液晶混合物和矩阵液晶显示器

    公开(公告)号:US06649088B1

    公开(公告)日:2003-11-18

    申请号:US09615737

    申请日:2000-07-13

    IPC分类号: C09K1912

    摘要: A nematic liquid crystal mixture having a positive dielectric anisotropy &Dgr;∈ of at least +4 and a birefringence &Dgr;n of at least 0.12, characterized in that the mixtures comprises one or more components having the core structure wherein L1, L2, Y and Z are each independently of one another H or F, one of Q1 and Q2 is 1,4-phenylene, 3-fluoro-1,4-phenylene or 3,5-difluoro-1,4-phenylene and the other residue Q1 or Q2 is —CH2CH2—, —CH2CH2CH2CH2— or—if at least one of L1, L2, Y and Z denotes F—also a single bond, whereby this core structure can be optionally further fluorinated in the benzene rings.

    摘要翻译: 具有至少+4的正介电各向异性Δε和至少为0.12的双折射Deltan的向列型液晶混合物,其特征在于,所述混合物包含一种或多种具有核心结构的组分,其中L 1,L 2, Y和Z各自独立地为H或F,Q 1和Q 2中的一个为1,4-亚苯基,3-氟-1,4-亚苯基或3,5-二氟-1,4 - 亚苯基和其余残基Q 1或Q 2是-CH 2 CH 2 - , - CH 2 CH 2 CH 2 CH 2 - 或 - 如果L 1,L 2,Y和Z中的至少一个表示F-也是单键 由此该核心结构可任选地进一步在苯环中氟化。

    Isolatable catalyst system suitable for the polymerization of C.sub.2
-C.sub.10 -alk-1-enes
    37.
    发明授权
    Isolatable catalyst system suitable for the polymerization of C.sub.2 -C.sub.10 -alk-1-enes 失效
    适用于C2-C10-alk-1-enes聚合的可分离催化剂体系

    公开(公告)号:US06152543A

    公开(公告)日:2000-11-28

    申请号:US894128

    申请日:1992-06-04

    摘要: A catalyst system suitable for the polymerization of C.sub.2 -C.sub.10 -alk-1-enes comprising, as active ingredients, a complex compound of metals in Sub-groups IV and V of the Periodic Table and an oligomeric alumoxan compound is obtained by a procedure in which metals in Sub-groups IV and V of the Periodic Table are mixed with the oligomeric alumoxan compound and the resulting mixture is then applied to finely divided polymer. The catalyst system of the invention can be isolated after manufacture and is particularly suitable for the gas-phase polymerization of C.sub.2 -C.sub.10 -alk-1-enes.

    摘要翻译: 适用于C2-C10-烷-1-烯的聚合的催化剂体系,其包含作为活性成分的周期表的Ⅳ族和Ⅴ族金属中的配位化合物和低聚铝氧烷化合物,通过以下步骤获得: 元素周期表的IV族和V族中的哪些金属与低聚铝氧烷化合物混合,然后将所得混合物施加到细碎的聚合物上。 本发明的催化剂体系可以在制造后分离,特别适用于C2-C10-烷-1-烯的气相聚合。

    Liquid crystal display
    39.
    发明授权
    Liquid crystal display 失效
    液晶显示器

    公开(公告)号:US5578241A

    公开(公告)日:1996-11-26

    申请号:US63093

    申请日:1993-05-18

    IPC分类号: C09K19/30 C09K19/52 G02F1/13

    CPC分类号: C09K19/3001 Y10T428/1027

    摘要: The invention relates to a liquid crystal display element which contains an electrically switchable, dielectrically positive twisted nematic liquid crystal layer between two substrates which together with a frame form a cell, and two layers with alignment layers thereon applied to the substrates. The liquid crystal mixture is based on SFM compounds. One of the electrodes forming an active matrix of non-linear switching elements is integrated within each picture element while the other electrode is the counter electrode. The alignment layer is an organic polymer layer which may be essential uniformly aligned by rubbing. The alignment layer results in an essential homogenous surface alignment of the liquid crystal layer with a surface tilt angle. The liquid crystal material comprises at least 30 wt. % of one or more compounds according to formula I ##STR1## wherein R, Z.sup.1, Z.sup.2, A.sup.1, A.sup.2, X, Y and n are herein defined, and the alignment layer is based on at least partially fluorinated polyimides.

    摘要翻译: 本发明涉及一种液晶显示元件,该液晶显示元件在两个基板之间包含电可切换的,介于上面的正扭曲向列型液晶层,该液晶显示元件与框架一起形成单元,其上具有对准层的两层施加到基板上。 液晶混合物基于SFM化合物。 形成非线性开关元件的有源矩阵的电极之一被集成在每个像素内,而另一个电极是对电极。 取向层是有机聚合物层,其可以通过摩擦基本均匀排列。 取向层导致液晶层与表面倾斜角的基本均匀的表面对准。 该液晶材料包含至少30wt。 %的一种或多种根据式I的化合物其中R,Z 1,Z 2,A 1,A 2,X,Y和n在此被定义,并且取向层基于至少部分氟化的聚酰亚胺。