摘要:
Provided herein is a reflective optical construction containing a fluoropolymer barrier layer, wherein the fluoropolymer is selected from the group consisting of homopolymers and copolymers of at least one tetrafluoropropene or pentafluoropropene, preferably 2,3,3,3-tetrafluoropropene. Also disclosed is a method of forming a reflective optical construction including (a) applying a barrier layer comprising one or more fluoropolymers selected from the group consisting of homopolymers and copolymers of at least one tetrafluoropropene or pentafluoropropene, and (b) curing.
摘要:
Developing compositions are provided herein for use in producing a visibly detectable image of a latent physiological biometric. The developing compositions include a carrier solvent that includes at least one C3-C4 hydrofluorocarbon olefin or at least one hydrochlorofluorocarbon olefin.
摘要:
Soil fumigation compositions are provided herein that include methyl iodide, at least one fluorocarbon or hydrofluorocarbon, at least one surfactant, and water. The fumigant can be produced by combining the water and surfactant with an intial mixture that is an azeotropic or azeotrope-like mixture of methyl iodide and at least one fluorocarbon or hydrofluorocarbon. The fumigant compositions can be utilized in drip fumigation processes, and have increased volatility as compared to methyl iodide alone, which can reduce the risk of water contamination when utilizing methyl iodide as a fumigant.
摘要:
A method and composition for transforming a latent physiological biometric into a visible physiological biometric are provided, the method comprising: providing a latent biometric disposed on a surface of an article, wherein said biometric comprises at least one eccrine-derived compound; contacting said latent biometric with a developing solution, wherein said developing solution comprises at least one imaging reagent selected from ninhydrin and 1,8-diazafluoren-9-one and a carrier solvent comprising at least one C 3 - C 4 hydrofluorocarbon; and reacting said imaging reagent with said eccrine-derived compound to produce a visible physiological biometric.
摘要:
The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to open-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a sterically hindered amine catalyst.
摘要:
The invention pertains to a process for preparing chlorodifluoroacetyl fluoride (CDAF) by oxidation of chlorotrifluoroethylene (CTFE) in a solvent using a continuously stirred tank reactor. It provides a process for the production of chlorodifluoroacetyl fluoride by comprises reacting a solvent solution of chlorotrifluoroethylene with oxygen in a reactor to form a product which comprises chlorodifluoroacetyl fluoride. The reacting may be conducted in a continuous or batch mode.
摘要:
The present invention is directed to low dielectric polymers and to methods of producing these low dielectric constant polymers, dielectric materials and layers, and electronic components. In one aspect of the present invention, an isomeric mixture of thermosetting monomers, wherein the monomers have a core structure and a plurality of arms, is provided, and the isomeric mixture of thermosetting monomers is polymerized, wherein polymerization comprises a reaction of an ethynyl group that is located in at least one arm of a monomer. In yet another aspect of the inventive subject matter, spin-on low dielectric constant materials are formed having a first backbone with an aromatic moiety and a first reactive group, and a second backbone with an aromatic moiety and a second reactive group, wherein the first and second backbone are crosslinked via the first and second reactive groups in a crosslinking reaction preferably without an additional crosslinker, and wherein a cage structure having at least eight (8) atoms is covalently bound to at least one of the first and second backbone.
摘要:
The present technology relates to fumigant compositions and fumigation processes, and particularly to processes for the fumigation of perishable products. The fumigant compositions comprise an azeotropic and azeotrope-like composition of methyl iodide and at least one fluorocarbon or hydrofluorocarbon. The fumigation methods include providing a fumigant composition and applying the fumigant composition to a perishable product.
摘要:
Disclosed is a process for making hexafluoro-2-butyne comprising the steps of: (a) providing a composition comprising CF3CX=CXCF3, where X = halogen; and (b) treating CF3CX=CXCF3 with a dehalogenation catalyst in the presence of a halogen acceptor compound Y, where Y is not hydrogen. The halogen acceptor compound Y is a material capable of being halogenated, preferably a compound having a multiple bond, such as an alkyne, alkene, allene, or carbon monoxide. Another suitable material capable of being halogenated is a cyclopropane. A catalyst effectively transfers halogen from CF3CX=CXCF3 to the halogen acceptor compound. Since Y is not hydrogen, the formation of CF3CX=CHCF3 is greatly reduced or eliminated.
摘要翻译:公开了制备六氟-2-丁炔的方法,包括以下步骤:(a)提供包含CF 3 C X = CXCF 3的组合物,其中X =卤素; 和(b)在卤素受体化合物Y的存在下用脱卤催化剂处理CF 3 C X = CXCF 3,其中Y不是氢。 卤素受体化合物Y是能够被卤化的物质,优选具有多重键的化合物,如炔烃,烯烃,烯烃或一氧化碳。 能够被卤化的另一种合适的材料是环丙烷。 催化剂有效地将卤素从CF 3 C X = CXCF 3转移到卤素受体化合物。 由于Y不是氢,CF3CX = CHCF3的形成大大降低或消除。
摘要:
Disclosed is a process for the preparation of fluorine-containing olefins comprising contacting a chlorofluoroalkane with hydrogen in the presence of a catalyst at a temperature sufficient to cause replacement of the chlorine substituents of the chlorofluoroalkane with hydrogen to produce a fluorine-containing olefin. Also disclosed are catalyst compositions for the hydrodechlorination of chlorofluoroalkanes comprising copper metal deposited on a support, and comprising palladium deposited on calcium fluoride, poisoned with lead and reducing the in the presence or absence of a dehydrochlorination catalyst under conditions effective to form a product stream comprising cis-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336).