Abstract: A passive infrared detector, including a pyroelectric sensor with three pairs of contiguous, active elements and a Fresnel lens with a plurality of segments each of which has an optical center and an equivalent focal length, each pair of active elements disposed in different plane, with each optical center juxtaposed to the plane of at least one of those active elements, substantially at the focal length.
Abstract: Polyolefins are stabilized against the harmful effects of U.V.-light by incorporating therein certain organosulfides. The organosulfides may be used alone or in synergistic combination with two classes of known light stabilizers, namely the benzophenones and the esters of aromatic acids.
Abstract: Alkanesulfonic acids and alkanesulfonyl chlorides, free of undesirable side products arising from side-chain chlorination, are prepared by oxidation with hydrogen peroxide of the corresponding alkanethiol, dialkyldisulfide or alkyl alkanethiolsulfonate mixed with aqueous hydrochloric acid.
Abstract: A penetration sensor is disclosed which contains first and second transducers sandwiched around a layer which capacitively isolates the individual transducers. This sensing arrangement allows for the operational state of the sensor to be tested by applying an interrogation signal to each of the transducers.
Abstract: 1,1-Dichloro-1-fluroethane and 1,1,1,3,3-pentafluorobutane are separated from their liquid mixtures, such as liquid mixtures resulting from the hydrofluorination of 1,1,1-trichloroethane or vinylidene chloride. 1,1-Dichloro-1-fluoroethane and 1,1,1,3,3-pentafluorobutane are completely separated by distillation, by adding to the mixture thereof a liquid containing at least about 3 moles of hydrogen fluoride per mole of 1,1-dichloro-1-fluoroethane in the mixture subject to separation.
Abstract: A process is disclosed for the preparation of 3-(organothio)aldehydes by reacting a mercaptan with an .alpha., .beta.-unsaturated aliphatic aldehyde under actinic radiation in the absence of an oxygen-containing gas wherein the mercaptan and aldehyde are mixed in substantially equimolar amount and the reaction temperature ranges from about 2.degree. to less than 60.degree. C.
Abstract: Anhydrous ferric fluoride of 99.0% purity or greater, based upon F.sup.- analysis is afforded, as well as a process for its manufacture using anhydrous FeCl.sub.3 and liquid anhydrous HF, reacted in the substantial absence of O.sub.2, H.sub.2 O, or an oxidizing agent.
October 18, 1988
Date of Patent:
July 3, 1990
Tariq Mahmood, Charles B. Lindahl, Ronald E. Davis
Abstract: A process is disclosed for continuously preparing dialkyl disulfides and dialkyl polysulfides by reacting at elevated temperature and in the presence of a solid, particulate catalyst an alkene and hydrogen sulfide in a first reaction zone, and then passing the reactor effluent into a second reaction zone where it is reacted at elevated temperature with molten, elemental sulfur in the presence of a solid, particulate catalyst.
May 18, 1988
Date of Patent:
June 26, 1990
Bernard Buchholz, Edward J. Dzierza, Robert B. Hager
Abstract: An electrostatic image display apparatus which uses piezoelectric film to enable a user to form images on a screen. The apparatus is contained within a housing. Supported within the housing is a common electrode. A layer of piezoelectric film is separated a distance from the common electrode by a suspension medium. The suspension medium contains electrially charged pigmented particles, the color of which contrasts with the color of the suspension medium. The housing has an opening for applying localized pressure to one surface of the piezoelectric film. In addition, the apparatus has a source for energizing the common electrode to a preselected electric potential. By applying a force or infrared energy to an area of the piezoelectric film a charge accumules on the inner surface of the film, directly under the point of application of the force. This charge attracts the electrically charged pigmented particles in the suspension medium which are visible through the film and create an image display.
Abstract: Acrylic coating resins with attached light stabilizer functional groups are provided.The polymer bound light stabilizer coating resins are prepared by reacting light stabilizer hydrazides, LS--C(.dbd.0)--NR.sup.3 --NH.sub.2, with an acrylic prepolymer containing at least two different types of reactive functional groups, one of which is a hydroxyalkyl ester group and the other is carboxyl, anhydride, epoxy or isocyanate. LS is a light stabilizer moiety, and R.sup.3 is hydrogen, primary alkyl of 1 to 8 carbons, secondary alkyl of 3 to 8 carbons, aralkyl of 7 to 12 carbons or cycloalkyl of 5 to 12 carbons. The reaction may be carried out in an inert solvent or in the bulk state.The acrylic resins so produced with chemically bound light stabilizer groups are particularly useful in the stabilization of coatings. Enamel or lacquer coatings containing the polymer bound light stabilizer regins exhibit outstanding weatherability and durability.
Abstract: Flame retardancy of polyphenylene ether resins is increased by blending with the resin a flame retarding amount of a halophenyl hydrocarbyl ester. The ester is preferably the reaction production of a halogenated phenol, preferably a bromophenol, and a hydrocarbyl acid, acid chloride or acid anhydride. The polyphenylene ether resin may include homopolymers or copolymers of polyphenylene ethers or blends of polyphenylene ethers with vinyl aromatic resins such as styrene polymers and copolymers. The flame retarding halophenyl esters are also effective as processing aids in improving the flowability and moldability of the polyphenylene ether resins during melt processing.
Abstract: Compounds which contain peroxide linkages and the radical of a hindered amine light stabilizer group are provided. These compounds function as polymerization initiators which cause the hindered amine stabilizer to be chemically bound to the polymer.
Abstract: A controlled release composition of biologically active materials is prepared by reacting a biologically active agent, aqueous polyhydroxy polymer, inorganic salt, and optional filler(s), drying the product and then grinding the product to the desire particle size. The product is then used, for example, for controlling pests.
Abstract: There are disclosed microcapsules containing a phytotoxic compound of the formula: ##STR1## where x is oxygen or sulfur and R is alkyl, alkoxy, alkylamino, halo, nitro or hydrogen, and the microcapsule walls comprise resinous polycondensates which are crosslinked polyurea, crosslinked polyamide or crosslinked polyamide-polyurea wherein the degree of crosslinking is about 25-100%, the walls are about 10 to about 30% of the total weight of the microcapsules, and the microcapsules have an average size ranging from about 7 to about 25 microns in diameter.