利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

482 条记录 (耗时 0.025 秒)

    Monofunctional polymers of olefins and block copolymers obtained therefrom
    1.
    发明授权
    Monofunctional polymers of olefins and block copolymers obtained therefrom 失效
    烯烃的单官能聚合物和由其获得的嵌段共聚物

    公开(公告)号：US5185401A

    公开(公告)日：1993-02-09

    申请号：US863489

    申请日：1992-04-02

    申请人： Gabriele Rendina ,  Enrico Albizzati

    发明人： Gabriele Rendina ,  Enrico Albizzati

    IPC分类号： C08F8/00 ,  C08F295/00 ,  C08G81/02

    CPC分类号： C08G81/02 ,  C08F295/00 ,  C08F8/00

    摘要： Functional polyolefins containing a terminal functional group; the block copolymers that can be obtained from such polyolefins by reaction with polymers reactive with the functional groups and the precursors used for the preparation of the functionalized polyolefins, which are made of olefin polymers terminated at one end with ZnR groups where R is an alkyl or aryl radical with 1-10 carbon atoms.

    摘要翻译： 含有末端官能团的官能性聚烯烃; 可以通过与由官能团反应的聚合物与用于制备官能化聚烯烃的前体反应而由这种聚烯烃获得的嵌段共聚物，其由一端以ZnR基团封端的烯烃聚合物制成，其中R为烷基或 具有1-10个碳原子的芳基。

    Liquid-crystal copolyethers based on 7-oxa-bicyclo(2,2,1)heptane
    3.
    发明授权
    Liquid-crystal copolyethers based on 7-oxa-bicyclo(2,2,1)heptane 失效
    基于7-OXA-BICYCLO（2,2,1）HEPTANE的液晶共聚物

    公开(公告)号：US5055547A

    公开(公告)日：1991-10-08

    申请号：US352678

    申请日：1989-05-10

    申请人： Leonardo Fiore ,  Giuseppe Motroni ,  Mauro Maritano

    发明人： Leonardo Fiore ,  Giuseppe Motroni ,  Mauro Maritano

    IPC分类号： C08G65/02 ,  C08G65/06 ,  C08G65/16 ,  C08G65/22 ,  C09K19/38

    CPC分类号： C08G65/16 ,  C09K19/3814

    摘要： The present invention relates to copolyethers comprising copolymers of 7,oxa-bicyclo(2,2,1)heptane, and its alkyl-derivatives, with one or more single-ring or condensed-rings cycloaliphatic ethers, comprising the characteristic group; ##STR1## wherein R' is hydrogen and R" is H, a halogen, or an alkyl radical containing a small number of carbon atoms, and which may also be halogen-substituted.If the ether contains one ring only, it contains from 5 to 12 atoms in the ring, and if it contains a condensed-ring system, it contains a total number of from 10 to 18 atoms in the rings.Those copolyethers show a anisotropic behaviour in the molten state, and therefore have liquid-crystal properties.

    摘要翻译： 本发明涉及包含7，氧杂双环（2,2,1）庚烷及其烷基衍生物的共聚物与包含该特征基团的一个或多个单环或稠环脂环族醚的共聚醚; 其中R'是氢，R“是H，卤素或含有少量碳原子的烷基，也可以是卤素取代的。 如果醚仅含有一个环，则它在环中含有5至12个原子，如果它含有稠环体系，则其中环的总数为10至18个原子。 这些共聚醚在熔融状态下显示出各向异性的特性，因此具有液晶性。

    Process for the enzymatic separation of the optical isomers of racemic oxazolidinonic derivatives
    7.
    发明授权
    Process for the enzymatic separation of the optical isomers of racemic oxazolidinonic derivatives 失效
    外消旋恶唑烷酮衍生物的光学异构体的酶分离方法

    公开(公告)号：US4933290A

    公开(公告)日：1990-06-12

    申请号：US137721

    申请日：1987-12-24

    申请人： Pietro Cesti ,  Daniele Bianchi ,  Franco Francalanci ,  Walter Cabri

    发明人： Pietro Cesti ,  Daniele Bianchi ,  Franco Francalanci ,  Walter Cabri

    IPC分类号： C12P17/14 ,  C12P41/00

    CPC分类号： C12P17/14 ,  C12P41/004

    摘要： There is disclosed a process for the biotechnological resolution, by enzymatic esterification of the corresponding racemic mixture of the S(+) and R(-) optical isomers of the oxazolidinonic compounds having formula (I): ##STR1## wherein R represents a, linear or branched, C.sub.1 -C.sub.8 alkyl group, which process is characterized in that, the racemic 3-alkyl-5-hydroxymethyl-oxazolidin-2-one derivative of formula (I) is reacted with an esterifying compound, selected from esters having formula (III): ##STR2## wherein R represents a, linear or branched, C.sub.1 -C.sub.10 alkyl or alkenyl group and R" represents a linear or branched, C.sub.1 -C.sub.4 alkyl, alkenyl group, a haloalkyl (chlorine, bromine) group or a diacyl glycerolic group or from acids having formula (IV):R'"--COOH (IV)wherein R'" represents a, linear or branched, C.sub.1 -C.sub.20 alkyl or alkenyl group or from anhydrides having formula (V): ##STR3## wherein R.sup.IV represents a, linear or branched, C.sub.1 -C.sub.6 alkyl group, in the presence of an enzyme, immobilized on a porous carrier, capable of giving rise selectively to the esterification reaction of the R(-) isomer, while leaving the S(+) isomer substantially unchanged, which latter is then separated according to known techniques.

    Process for the preparation of polyacetylene
    10.
    发明授权
    Process for the preparation of polyacetylene 失效
    聚乙炔的制备方法

    公开(公告)号：US4771115A

    公开(公告)日：1988-09-13

    申请号：US921145

    申请日：1986-10-21

    申请人： Enrico Albizzati ,  Michele Petrera ,  Giovanni Giunchi

    发明人： Enrico Albizzati ,  Michele Petrera ,  Giovanni Giunchi

    IPC分类号： C08F4/00 ,  C08F4/60 ,  C08F4/64 ,  C08F4/659 ,  C08F4/80 ,  C08F38/00 ,  C08F38/02 ,  C08F138/02

    CPC分类号： C08F38/02

    摘要： Polyacetylene having an apparent density at 20.degree. C. greater than 0.6 g/ccm and a surface area below 60 m.sup.2 /g is prepared by polymerizing gaseous acetylene in the presence of a catalytic system consisting of:(a) an oxygenized compound of Ti or V, containing at least one metal-oxygen bond;(b) an organometallic compound of aluminum containing at least one hetero-atom, of the formula: ##STR1## wherein: ##STR2## while R=a hydrocarbon radical with 1-18 carbon atoms, and where R'.dbd.R, or halogen or alcoxyl.

    摘要翻译： 通过在催化体系存在下聚合气态乙炔来制备表观密度大于0.6g / cm 2，表面积低于60m 2 / g的聚乙炔，所述催化体系由以下组成：（a）Ti的氧化化合物或 V，含有至少一个金属 - 氧键; （b）含有至少一个杂原子的铝的有机金属化合物，其具有下式：其中：当R =具有1-18个碳原子的烃基，并且其中R'= R或卤素 或醇酸。