Abstract:
A method, and the structure formed thereby, of coating a fluidizable material onto a surface of a substrate wherein the substrate is not wettable by the fluidizable material includes depositing a layer of powder particles on the surface of the substrate, the powder particles being wettable by the fluidizable material; contacting the fluidizable material to the layer of powder particles; and allowing the fluidizable material to wick between the powder particles and to contact the surface of the substrate. Another aspect is a method for making a ceramic-metal tape which includes depositing a layer of a non-wettable ceramic powder onto a solid form; depositing a layer of a wettable powder onto the layer of the non-wettable ceramic powder; contacting a metal to the layer of the wettable powder; heating the metal to a temperature in which the metal melts and wicks through the layer of the wettable powder, and cooling the metal-infiltrated structure to solidify the metal. Another aspect is a method for bonding ceramic bodies together and the layered structure formed therefrom. The method includes coating a surface of a first ceramic body with non-reactive powder particles and reactive powder particles; abutting a surface of a second ceramic body against the coated surface of the first ceramic body; contacting the coating between the first ceramic body and the second ceramic body with a metal; and heating the metal so that the metal infiltrates through the powder particles.
Abstract:
The biodegradability of polyglycol-based block copolymers is improved by including in the copolymer a lactone. Representative of these biodegradable enhanced copolymers are those made of 1,2-butylene oxide and epsilon -caprolactone capped with a homopolymer block of ethylene oxide. The copolymers of this invention have many uses, such as nonionic surfactants, foam control agents, and lubricants.
Abstract:
A process for preparing titanium or zirconium diene complexes wherein the metal is in the + 2 formal oxidation state comprising contacting a conjugated or nonconjugated C4-40 diene compound with a hydrocarbyloxide containing precursor complex.
Abstract:
A process for preparing a liquid, storage-stable composition containing an organic polyisocyanate and an acid phosphate is disclosed. The process includes the steps of (1) heating a mixture of a polyisocyanate and an acid phosphate at a temperature in the range of from 60 DEG C to 190 DEG C for a time such that no phase separation occurs upon cooling the reaction mixture to ambient temperature, the mixture containing dissolved gases; and (2) subjecting the mixture to a negative pressure sufficient to remove at least a portion of the dissolved gases therefrom. The negative pressurization significantly slows the rate of carbon dioxide evolution thereafter and therefore enables much longer term storage-stability than is obtainable when the negative pressurization step is not performed, beacause it reduces problems associated with pressurization of containers.
Abstract:
A novel intermediate useful in the synthesis of alpha-alanine diacetic acid or its salts is disclosed. The intermediate can be formed by contacting alanine with glycolonitrile under alkaline conditions or glycine with lactonitrile to form an aminonitrile which can be hydrolyzed and then contacted with additional glycolonitrile to form the nitrile intermediate which can be converted to alpha-alanine diacetic acid via hydrolysis.
Abstract:
A novel intermediate useful in the synthesis of 2-hydroxypropyl iminodiacetic acid is disclosed. The intermediate can be formed by contacting 2-hydroxypropyl amine with glycolonitrile to form an aminonitrile which can be hydrolyzed and contacted with additional glycolonitrile to form the nitrile intermediate which can be converted to 2-hydroxylpropyl iminodiacetic acid via hydrolysis.
Abstract:
2-(Aryl)-benz(ox, thi, imid)azoles are prepared by reacting an aromatic aldehyde with hydroxylamine to form an aromatic aldehyde oxime, halogenating the oxime to form an aromatic hydroxamoyl halide, and then reacting this halide with certain aromatic amine compounds. The products may be nitrated and then reduced to form the corresponding diamines, which are useful in making PIBX polymers.
Abstract:
An alignment layer for a liquid crystal display device is described. The alignment layer comprises a copolymer of a thermoset polymer containing perfluorinated cyclobutane rings and a thermoplastic polymer containing perfluorinated cyclobutane rings, or a blend of thermoset and thermoplastic homopolymers or copolymers containing perfluorinated cyclobutane rings. This copolymer or blend provides an alignment layer with a cure temperature of less than 250 DEG C, a low dielectric, and a low moisture content. The resultant alignment layer can also provide surface tilt angles suitable for supertwisted nematic-liquid crystal displays.
Abstract:
A process for preparing syndiotactic polymers of vinylaromatic monomers comprising contacting one or more vinylaromatic monomers with a catalyst system comprising a pentamethylcyclopentadienyltitanium based metal complex capable of preparing syndiotactic vinylaromatic polymers under coordination polymerization conditions in the presence of hydrogen gas at a hydrogen partial pressure from 10 to 45 kPa.
Abstract:
A supported catalyst component comprising (a) a support material, an organometal compound, and (b) an activator compound comprising b.1) a cation which is capable of reacting with a transition metal compound to form a catalytically active transition metal complex, and b.2) a compatible anion having up to 100 nonhydrogen atoms and containing at least one substituent comprising an active hydrogen moiety; a supported catalyst comprising the supported catalyst component and a transition metal compound; process for making the same; an addition polymerization process using the supported catalyst; complex compounds, and a method for preparing the same.