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    Preparation of hydroxy terminated polysiloxanes
    101.
    发明公开
    Preparation of hydroxy terminated polysiloxanes 失效
    Verfahren zur Herstellung von Polysiloxanen mitendständigenHydroxylgruppen。

    公开(公告)号：EP0314315A2

    公开(公告)日：1989-05-03

    申请号：EP88309188.6

    申请日：1988-10-03

    申请人： DOW CORNING S.A.

    发明人： Trego, Brian Robert

    IPC分类号： C08G77/16 ,  C08G77/32

    CPC分类号： C08G77/08 ,  C08G77/16 ,  C08G77/32

    摘要： The specification discloses a method of preparing a poly­siloxane by chain extension of a silicon compound having chain terminating units including a silicon-bonded hydroxyl group which comprises bringing about condensation of the silicon-­bonded hydroxyl groups at a temperature of less than 50°C in presence of an acidic condensation catalyst of the formula RSO₃H and water, to an extent of less than 7 moles per mole of acidic condensation catalyst. The silicon compound may comprise a hydroxyl end-blocked polydimethylsiloxane having a viscosity at 25°C in the range 30 to 100,000 mm²/s, and it may be polymerised to provide an α,ω dihydroxy polydimethylsiloxane having a viscosity in the range 1,000 mm²/s to 100,000 mm²/s or more. Preferred acidic condensation catalysts are those in which R is an alkyl group having a chain of 6 to 18 carbon atoms or a group R˝C₆H₄ where R˝ represents a hydrogen atom or an alkyl group having a chain of 6 to 18 carbon atoms. The preferred catalyst is dodecylbenzenesulphonic acid. A basic material may be added to the reaction mixture to neutralise said catalyst for example calcium carbonate or magnesium carbonate. The reaction mixture may be compounded to provide a curable composition, for example a moisture curable sealant composition comprising a mixture and/­or a reaction product of the polysiloxane and a curative, a catalyst and finely divided filler.

    摘要翻译： 本说明书公开了一种通过具有包含硅键合羟基的链终止单元的硅化合物的链延长制备聚硅氧烷的方法，该方法包括在低于50℃的温度存在下使硅键合羟基的缩合 的式RSO 3 H的酸性缩合催化剂和水，每摩尔酸性缩合催化剂的量小于7摩尔。 硅化合物可以包含25℃下粘度在30-100,000mm 2 / s范围内的羟基封端的聚二甲基硅氧烷，并且可以将其聚合以提供粘度在该范围内的α，ω-二羟基聚二甲基硅氧烷 1,000mm 2 / s至100,000mm 2 / s以上。 优选的酸性缩合催化剂是其中R为具有6至18个碳原子的烷基的基团或R sec C6H 4基团，其中R sec表示氢原子或具有6至18个碳原子的链的烷基。 优选的催化剂是十二烷基苯磺酸。 可以向反应混合物中加入碱性物质以中和所述催化剂，例如碳酸钙或碳酸镁。 可以将反应混合物配混以提供可固化组合物，例如包含聚硅氧烷和固化剂，催化剂和细碎填料的混合物和/或反应产物的可湿气固化的密封剂组合物。

    HIGH REFRACTIVE INDEX GLASSES, MULTIFOCAL CORRECTIVE LENSES CONTAINING SAME
    105.
    发明授权
    HIGH REFRACTIVE INDEX GLASSES, MULTIFOCAL CORRECTIVE LENSES CONTAINING SAME 失效
    随着对这些玻璃高折射率和多焦点镜片矫正眼用镜片

    公开(公告)号：EP0979216B1

    公开(公告)日：2003-06-11

    申请号：EP98918736.4

    申请日：1998-04-27

    申请人： Corning S.A.

    发明人： COMTE, Marie ,  MARQUES, Paulo

    IPC分类号： C03C3/07 ,  C03C3/072 ,  G02C7/06

    CPC分类号： C03C3/074 ,  C03C3/07 ,  C03C3/072 ,  Y10S501/903

    摘要： The present invention relates to glasses of high refractive index having the following composition of oxides, expressed in percentages by weight: SiO2 27 - 36, B2O3 0 - 9, Li2O 1 - 5, Na2O 1 - 7, K2O 0 - 7, CaO 0 - 7, BaO 4 - 13, ZnO 0 - 8, La2O3 4 - 15, PbO 4 - 27, TiO2 7 - 18, ZrO2 0 - 9, Nb2O5 0 - 8 with: Li2O+Na2O+K2O 6 - 15, SiO2+TiO2+ZrO2 42 - 55, PbO+TiO2+ZrO2+Nb2O5 29 - 40; their use for the production of segments for multifocal corrective lenses; and multifocal corrective lenses incorporating at least one such segment in their structure.

    PREPARATION OF A STABLE COMPOSITION OF RADICALLY COPOLYMERISABLE MONOMERS WHICH CONTAINS AT LEAST ONE MONOMER HAVING UREA FUNCTION(S)
    106.
    发明公开
    PREPARATION OF A STABLE COMPOSITION OF RADICALLY COPOLYMERISABLE MONOMERS WHICH CONTAINS AT LEAST ONE MONOMER HAVING UREA FUNCTION(S) 有权
    用于生产自由基聚合单体的稳定组合物，它至少一种具有脲基单体含有

    公开(公告)号：EP1290057A1

    公开(公告)日：2003-03-12

    申请号：EP01945207.7

    申请日：2001-05-29

    申请人： Corning S.A.

    发明人： BEAR, Marie-Maud ,  LAFOSSE, Xavier

    IPC分类号： C08G18/50 ,  C08G18/81 ,  C08F212/14 ,  C08F220/36

    CPC分类号： C08G18/5024 ,  C08F212/14 ,  C08F220/36 ,  C08G18/8108

    摘要： The object of the present invention is a method of preparing a stable composition of radically copolymerisable monomers, said composition containing firstly at least one monomer which has at least one urea function in its formula and secondly at least one monomer which does not have an isocyanate function in its formula, said method comprising preparing said monomer(s) having urea function(s) by reaction of two types of reagent: at least one radically copolymerisable monomer which has at least one isocyanate function in its formula with at least one amine selected from primary and secondary amines, and incorporating said monomer(s) which does(do) not have an isocyanate function in its(their) formula, prior to said reaction, together with one of said reagents, before adding the other of said reagents, and/or during the addition of said reagents, and/or after said reaction. Characteristically, within the context of said method, said reaction for preparing said monomer(s) having urea function(s) is carried out in the absence of non-radically polymerisable solvent, with said reagents, monomer(s) having isocyanate function(s) and amine(s), being incorporated in relative proportions such that the isocyanate equivalent/amine equivalent ratio be between 0.98 and 1.02, and advantageously equal to 1, and said monomer(s) having urea function(s) obtained at the end of said reaction is(are) maintained diluted in the solvent which is constituted of said monomer(s) which does(do) not have an isocyanate function in its(their) formula, in the presence of dissolved oxygen.

    Siloxane emulsions
    110.
    发明公开
    Siloxane emulsions 有权
    硅氧烷乳液

    公开(公告)号：EP1054032A3

    公开(公告)日：2002-11-20

    申请号：EP00109695.7

    申请日：2000-05-08

    申请人： DOW CORNING S.A.

    发明人： Creutz, Serge Firmin Alain ,  Henault, Benoit Charles Jean Paul

    IPC分类号： C08J3/03

    CPC分类号： C08J3/03 ,  C08J2383/04

    摘要： An oil-in-water emulsion composition comprising 0.5% to 20% by weight of a cationic emulsifier, up to 75% by weight of siloxane and water, wherein the siloxane is liquid and has units according to the formula R a Si O 4-a/2 wherein R is hydrocarbon or OH and a is 0 to 3 and wherein the cationic emulsifier is free from halogen in its counter ion, preferably methosulphate, etho-sulphate, acetate, tosylate, phosphate or nitrate. The siloxane preferably has a viscosity at 25°C of from 10,000 to 1,000,000 mPa.s and is selected from polydimethyl siloxanes and polydimethyl polymethyl phenyl siloxanes. Also covered is a process of depositing siloxanes from such siloxanes.