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    • 13. 发明公开
    • Process for realization of polymeric materials with second order nonlinear electro-optical properties and electro-optical devices made with said material
    • 一种制备聚合物材料的与第二阶非线性的电光特性,和电光装置由这种材料制造的过程
    • EP2468784A3
    • 2013-04-17
    • EP11425299.2
    • 2011-12-16
    • Selex Sistemi Integrati S.p.A.
    • Borbone, FabioRoviello AntonioCentore RobertoCarella AntonioDe Matteis FabioCasalboni MauroStracci GlaucoDispenza Massimiliano
    • C08G18/10C08G18/16C08G18/38C08G18/76G02F1/361
    • G02F1/361C08G18/10C08G18/32C08G18/3836C08G18/384C08G18/7621C08G18/7657G02F1/3615
    • Process for realization of polymeric materials with second order nonlinear electro-optical properties and electro-optical devices made with said material
      The present concerns a process for realization of polymeric materials with second order nonlinear electro-optical properties comprising the following steps:
      - mixing of a chromophore with nonlinear optical properties with two or three hydroxy groups in an isocyanate not reactive solvent containing an isocyanate compound with at least two isocianate groups in order one or more bi- or tri-isocyanate NLO chromophores to be obtained;
      - isolation of said pure bi- or tri-isocyanate NLO chromophores obtained according to the above step;
      - dissolution of said bi- or tri-isocyanate NLO chromophores obtained according to the above step in one or more isocyanate group not reactive solvents containing reactive substances consisting of acyl-substituted or unsubstituted formamides and/or acylamides bearing as nitrogen substituents, independently, one or more hydrogen atoms, one or more alkyls substituted or unsubstituted with isocyanate moiety not reactive groups, one or more phenyl groups substituted or unsubstituted with isocyanate moiety not reactive groups, in order to obtain a prepolymer mixture consisting of said not reactive solvents and reaction products of said NLO bi- or tri-isocyanate chromophores and said reactive substances;
      - coating of a thin layer of said prepolymer mixture on a substrate and evaporation of said not reactive solvents;
      - cross-linking and poling of said thin layer on substrate, by means of heating and application of an electric field, in order a cross-linked and poled thin layer to be obtained;
      - cooling of said thin cross-linked and poled layer at ambient temperature maintaining the applied poling electric field;
      - switching off the poling electric field.
      The invention further concerns a process for the realization of an electro-optical device by definition of optical paths and driving electrodes in a polymeric material with second order nonlinear properties, comprising, following the steps of realization of said polymeric material with second order nonlinear electro-optical properties as previously defined, a step set of photolithographic definition and ionic erosion of said polymeric material, after a step for coating of a protecting buffer layer on said polymeric material layer, so as to maintain constantly embedded said layer of polymeric material in the areas involved in optical path realization during all the successive photolithographic definition and ionic erosion steps.
    • 19. 发明公开
    • Compositions pour moule de fonderie contenant du sable, un liant en polyuréthane et un composé nitro
    • Giessereiformzusammensetzungen aus沙,einem聚氨酯粘合剂和硝酸盐硝酸盐。
    • EP0292405A1
    • 1988-11-23
    • EP88401243.6
    • 1988-05-20
    • HUTTENES ALBERTUS FRANCE
    • Bhattacharya, Asita Charan
    • B22C1/22C08G18/38
    • B22C1/2273B22C1/22B22C1/2253C08G18/384C08G18/542
    • La présente invention a pour objet un perfectionnement aux compositions destinées à la fabrication de moules ou noyaux de fonderie contenant du sable et les matières premières nécessaires à la polymérisation in situ d'un liant de type polyuréthane.
      Le perfectionnement consiste à ajouter 5 à 50% en poids d'un composé nitro de formule R₁R₂CHNO₂ où R₁ et R₂ = H, ou C n H 2n+1 avec n = 1 à 6 où R₁ et R₂ forment avec l'atome de carbone substitué par le groupe NO₂ un cycle hydrocarboné saturé comportant 3 à 6 atomes de carbone éventuellement alkyl substitué par rapport à la quantité de polyol contenant au moins deux groupes OH par molécule et entrant en réaction avec un polyisocyanate contenant au moins deux groupes NCO par molécule.
      L'addition de ce composé nitro permet d'obtenir des moules ou noyaux combinant de bonnes propriétés mécaniques avant coulée du métal dans le moule à une bonne désagrégation après coulée du métal fondu.
    • 本发明的主题是用于制造包含砂的铸模或芯的组合物的改进以及聚氨酯类型的粘合剂的原位聚合所需的原料。 改进之处在于加入5至50重量%的式R 1 R 2 CHNO 2的硝基化合物,其中R 1和R 2 = H,或C n H 2n + 1,n = 1至6,其中R 1和R 2与被NO 2基团a取代的碳原子一起形成 相对于每分子含有至少两个OH基团的多元醇的量,含有3至6个任选的烷基取代的碳原子的饱和烃环,并且与每分子含有至少两个NCO基团的多异氰酸酯反应。 通过添加该硝基化合物,可以在熔融金属铸造之前,在铸造金属之前获得具有良好机械性能的模具或芯体,同时具有良好的分解性。