Abstract:
What is described is a method for producing a thermally shaped substrate coated with a sol-gel coating material, in which the sol-gel coating material comprises one or more hydrolyzable silanes, which may have been hydrolyzed to form a precondensate, and, if desired, a crosslinking agent, at least some of the hydrolyzable silanes containing on a non-hydrolyzable substituent a functional group by way of which crosslinking is possible, and in which A) the sol-gel coating material is applied to a thermally shapable substrate, B) the applied sol-gel coating material is partially precrosslinked and/or dried, C) the substrate coated with the sol-gel coating material is subsequently shaped thermally, and D) during and/or after the thermal shaping the sol-gel coating material is cured completely by means of thermal or photochemical crosslinking.
Abstract:
Described is a process for protecting a metallic substrate against corrosion resulting in the formation of a species X, derived from the metal, wherein a coating composition based on (hetero)polysiloxanes prepared by hydrolysis and condensation processes is applied to the substrate and cured, and which is characterized in that the coating composition comprises at least one species Z which reacts or interacts with the metal to form a species Y having a more negative formation enthalpy than the species X.
Abstract:
A process is disclosed for preserving paper involving the following steps:(a) a plurality of paper layers in contact with one another at least in regions is simultaneously brought into contact with a preservative fluid containing polycondensates based on one or more hydrolytic polycondensation-capable compounds of elements M of main groups III-V and sub-groups II-IV of the Periodic Table; in said polycondensates, at least one organic group (G) with at least two carbon atoms and for each carbon atom at least one atom selected from hydrogen or fluorine and without polar substituents is bound, either directly via one of the carbon atoms or via a connecting group A, to at least 0.1% of the central atoms M; and(b) the paper thus treated with the preservative fluid is dried and/or hardened.
Abstract:
Thin SiO.sub.2 films can be produced by hydrolysis and condensation ofa) 40 to 100% by weight of one or more silanes of general formula (I)R.sub.x --Si--A.sub.4-x (I) in which the groups A are identical or different and stand for hydroxyl groups or hydrolytically separable groups, the groups R are identical or different and stand for hydrolytically non-separable groups, x has the value 0, 1, 2 or 3, x being not less than 1 for 70% by moles of said silanes;b) optionally in the presence of 0 to 50% by weight of colloidal SiO.sub.2 and/orc) 0 to 10% by weight of organic binder.The viscous sol thus obtained is worked into a gel film which is heat-treated.
Abstract:
A process is disclosed for the production of compounds based on hydrolyzable silanes containing epoxy groups. The process involves adding one of the following substances to a pre-hydrolyzed silicon compound A with at least one hydrolytically non-separable group which includes an epoxy ring in the presence of an alcoholate of zirconium or aluminum: i) a particulate substance B which can be selected from oxides, oxyhydrates, nitrides or carbides of Si, Al and B, and of transition metals, the particle size being 1-100 nm;ii) a surface-active agent, preferably non-ionic;iii) an aromatic polyol with an average molecular weight not exceeding 1000, the resulting compounds being useful to produce coatings and molded bodies with a range of properties, in particular high scratch resistance, lasting hydrophilic characteristics, corrosion resistance, good adhesion and transparency.
Abstract:
A description is given of a process for producing weakly agglomerated, densified and/or crystallized nanosize particles which is characterized in that either(a) a suspension containing amorphous or partially crystalline nanosize particles is produced in a conventional manner from precursors for the nanosize particles, where the nanosize particles are produced in a solvent which has no solvent capability, or only a low solvent capability, for the particles and in the presence of at least one surface-blocking substance, or(b) an already formed powder comprising amorphous or partially crystalline nanosize particles is suspended in the solvent specified under (a) in the presence of the surface-blocking substance or substances specified under (a), or(c) a sol containing amorphous or partially crystalline nanosize particles is suspended in the solvent specified under (a) in the presence of the surface-blocking substance or substances specified under (a); andthe suspension thus produced is subjected to conditions which lead to a densification and/or crystallization of the nanosize particles.
Abstract:
The composite adhesive for optical and opto-electronic applications contains the following:a) transparent polymers and/or polymerizable oligomers and/or monomers suitable for use as adhesive,b) nanoscale inorganic particles,c) optionally, compounds for the surface modification of said inorganic particles, andd) optionally, a crosslinking initiator.The composite adhesive is suitable for connecting individual components of optical or opto-electronic elements and for constructing such elements.
Abstract:
An anisotropically conducting adhesive includes a thermoplastic base material; and particles which include metal particles and metal ions, which are electrically conductive, and which are finely distributed within the thermoplastic base material below a percolation threshold, wherein the particles are enriched in certain regions under the influence of exposure to at least one of light and heat. A process for producing an anisotropically conducting adhesive includes providing a material comprised of thermoplastic base material in which electrically conductive particles including metal particles and metal ions are dispersed; and exposing the material to at least one of light and heat in predetermined regions in a targeted manner so that a targeted local heating occurs in the exposed regions and an increased mobility of the metal particles and metal ions occurs which is effective to provide a plurality of anisotropically electrically conductive paths having an enriched amount of the electrically conductive particles compared to that of adjacent regions, wherein the metal ions contribute to the formation of the plurality of anisotropically electrically conductive paths by undergoing reduction from the metal ion to the metal.
Abstract:
TiN sintered bodies and coatings are produced by dispersing nanocrystalline TiN powder in water and/or a polar organic solvent as dispersing agent in the presence of at least one low molecular organic compound having at least one functional group which can react or interact with groups on the surface of the powder particles, removing the dispersing agent and sintering the surface-modified TiN which has been processed into green bodies or coatings before or after the removal of the dispersing agent.
Abstract:
A lineal of plastic material comprises multiple components extruded as a single piece and secured to one another by at least one wall formed in the lineal. One of the components is provided with a recess and another of the components has a leg which, upon separation of the components at the wall, fits into the recess of the one component to provide a mated component system.