Abstract:
Radiation curable coatings for use as a Primary Coating for optical fibers, optical fibers coated with said coatings and methods for the preparation of coated optical fibers. The radiation curable coating comprises at least one (meth)acrylate functional oligomer and a photoinitiator, wherein the urethane-(meth)acrylate oligomer CA/CR comprises (meth)acrylate groups, at least one polyol backbone and urethane groups, wherein about 15% or more of the urethane groups are derived from one or both of 2,4- and 2,6-toluene diisocyanate, wherein at least 15% of the urethane groups are derived from a cyclic or branched aliphatic isocyanate, and wherein said (meth)acrylate functional oligomer has a number average molecular weight of from at least about 4000 g/mol to less than or equal to about 15,000 g/mol; and wherein a cured film of the radiation curable Primary Coating composition has a modulus of less than or equal to about 1.2 MPa.
Abstract:
A curable composition comprising: (i) 2.5 to 50 wt % crosslinker comprising at least two acrylamide groups; (ii) 20 to 65 wt % curable ionic compound comprising an ethylenically unsaturated group and an anionic group; (iii) 15 to 45 wt % solvent; and (iv) 0 to 10 wt % of free radical initiator; wherein the molar ratio of (i):(ii) is 0.1 to 1.5. The compositions are useful for preparing ion exchange membranes.
Abstract:
The present invention relates to a coated polycarbonate film coated with at least one polymethylmethacrylate-containing layer, comprising a polycarbonate film beneath at least one polymethylmethacrylate-containing layer having a polymethylmethacrylate content of at least 40% by weight, characterized in that the total layer thickness of the at least one polymethylmethacrylate-containing layer is at least 10 μm, the uppermost layer of the at least one polymethylmethacrylate-containing layer is obtainable by coating with a coating composition comprising at least one polymethylmethacrylate polymer or polymethylmethacrylate copolymer having a mean molar mass Mw of at least 100 000 g/mol in a content of at least 40% by weight of the solids content of the coating composition; at least one UV-curable reactive diluent in a content of at least 30% by weight of the solids content of the coating composition; at least one photoinitiator in a content of 0.1 to 10 parts by weight of the solids content of the coating composition; and at least one organic solvent, where the proportion of ethylenically unsaturated groups is at least 3 mol per kg of the solids content of the coating composition.
Abstract:
Compounds and methods for controlling the surface properties are described. Compounds of the invention can form radicals upon exposure to irradiation, which can then react with nearby molecules to alter the surface properties of various substrates. The invention can provide surfaces that are resistant to dewetting, surfaces that have immobilized molecules such as carbohydrates and polymers immobilized, and surfaces that have metals deposited on the surface. The invention can be utilized in a wide range of application, such as sensors, microreactors, microarrays, electroless deposition of metals, and the like.
Abstract:
A method and equipment to form a digital image on a surface by applying a powder layer including color pigments on the surfaces, bonding a part of the powder and removing the non-bonded powder from the surface.
Abstract:
A system and method for monitoring and operating one or more light emitting devices is disclosed. In one example, light intensity within a dual elliptical reflecting chamber is sensed and operation of a fiber curing system is adjusted in response to an amount of sensed light energy.
Abstract:
Partially reacted alkoxysilane compositions, the use of partially reacted alkoxysilane compositions as adhesion-promoting primer coatings, and methods of using the partially reacted alkoxysilane compositions and coatings are disclosed.
Abstract:
A method and kit for restoration of a plastic headlight surface including the steps of conditioning a headlight surface by wet sanding with 600 grit sandpaper effective to remove a laminate coating, wiping the headlight surface with a lint free towel, cleaning the headlight surface with an alcohol treated towel, coating the headlight surface with an ultra violet light curable restoration formulation comprising aliphatic urethane acrylate in the range of 25% to 60%, a photoinitiator in the range of 1% to 5%, N-butyl acetate in the range of 5% to 25%, Toluene in the range of 3% to 15%, a Methyl isobutyl ketone in the range of 3% to 15%, a light stabilizer in the range of 1% to 5%, and includes a flow agent; and exposing the coated headlight surface to an ultra-violet light for at least 10 minutes. In the preferred embodiment, the formulation includes a hydrocarbon propellant and is applied from a spray can.
Abstract:
Ultraviolet-C (UVC) photochemistry for customizing an appearance of a wood product is described. In an implementation, a calculated amount of UVC radiation at a wavelength between 100-290 nanometers, for example, is applied to wood to achieve a desired appearance. The customized wood is free of the volatile organic compounds (VOCs) of stains, varnishes, and paints. The amount of UVC radiation to apply can be based on the tannin content of the wood or on other wood parameters or added photoactive agents. Photochemical interaction between the UVC radiation and various wood extracts, metal ion solutions, acids, bases, and oxidizers is also used to modify the color or lightness of a wood product. An example system includes multiple stations for programmatically spraying a wood product with various processing solutions, drying the wood, and irradiating the wood at one or more stages of the process with UVC radiation to interact with both the processing solutions and the wood surface, at programmed time intervals.
Abstract:
The present invention relates to a coating composition that provides improved scratch and stain resistance. The coating composition includes a curable film-forming resin having at least two multi-functional (meth)acrylates and a plurality of particles dispersed within the resin, said particles comprising (i) inorganic nanoparticles and (ii) wear resistant mineral particles. The wear resistant mineral particles have an average particle size of greater than 3.5 microns.