Abstract:
The disclosure relates to aqueous compositions which comprise water soluble fluorinated surfactant, fluorinated synergist, ionic non-fluorochemical surfactant, nonionic non-fluorochemical surfactant, electrolyte, and solvent. This composition is a concentrate which when diluted with water spreads on fuel surfaces suppressing vaporization. Because of this property the aqueous solutions of the above compositions are effective as agents for fire fighting.
Abstract:
The disclosure relates to aqueous compositions which comprise amphoteric fluorinated surfactant, anionic fluorinated surfactant, ionic non-fluorochemical surfactant, non-ionic, non-fluorochemical surfactant and optionally solvent. This composition is a concentrate which, when diluted with water, spreads on fuel surfaces suppressing vaporization. Because of this property the aqueous solutions of the above compositions are effective as fire fighting agents.
Abstract:
Methods and systems that excite a test structure with an excitation beam and then sense the response of the test structure after some prescribed time interval with respect to the excitation. One or more detectors detect an emission from the test structure at a location of the test structure that is offset from a position on the test structure that is coincident with the excitation beam as the beam is scanned across the test structure.
Abstract:
Polyurethanes and polyesters are described which are the reaction products of an aromatic, aliphatic or cycloaliphatic diisocyanate, or of a diacid or diacid derivative respectively, with a diol containing a pendent UV-absorbing moiety, optionally also with one or more other diols or diamines. These UV-absorbing polycondensates can be applied to the surfaces of substrates by exhaustion methods or by spraying and act to protect polymers and dyes from degradation by UV radiation. They are therefore useful, either alone or in combination with other coating materials, for the treatment of wood, paper, textiles, leather or other surfaces which are exposed to degrading radiation.
Abstract:
Tris-perfluoroalkyl terminated neopentyl alcohols of the formula (R.sub.f --E.sub.n --X--CH.sub.2).sub.3 CCH.sub.2 OH prepared from halogenated neopentyl alcohols and thiols of the formula R.sub.f --E.sub.n --SH, amines of the formula R.sub.f --E.sub.n --NH--R, alcohols of the formula R.sub.f --E.sub.n --OH, perfluoro-acids or amides, are described. The alcohols react with isocyanates to prepare urethanes; with acids or derivatives, to prepare esters or carbonates; with epoxides to form ethers. Further, they may be converted to halide intermediates. The products all contain the residue of at least one R.sub.f -neopentyl alcohol containing three perfluoroalkyl hetero groups.
Abstract:
Heteroatom containing perfluoroalkyl terminated neopentyl glycols of the formulas HO[--CH.sub.2 C(CH.sub.2 X--E--R.sub.f).sub.2 CH.sub.2 O].sub.1-3 --H or HO[--CH.sub.2 C(CH.sub.2 X--R.sub.f).sub.2 CH.sub.2 O].sub.1-3 --H are prepared from halogenated neopentyl glycols or oxetanes and thiols of the formula R.sub.f --E--SH, amines of the formula R.sub.f --E--NH--R, alcohols of the formula R.sub.f --E--OH or perfluoro-amides, wherein R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 18 carbon atoms or said perfluoroalkyl substituted by perfluoroalkoxy of 2 to 6 carbon atoms.The polymeric reaction products of said fluorinated diols, and optionally other diols with isocyanates to prepare polyurethanes; with amines and isocyanates to prepare polyureas/polyuretanes; with acids or derivatives to prepare polyesters or polycarbonates are disclosed. These include polymeric, random or block urethane, and/or urea, and/or ester compositions containing the residue of at least one R.sub.f -neopentyl glycol containing two perfluoroalkyl hetero groups.These polymeric compositions provide improved thermal stability and useful low surface energy oil and water repellent coatings, and soil-release properties for textiles, glass, paper, leather and other materials.
Abstract:
An angular reflectance sensor having no moving parts and capable of the essentially simultaneous measurement of the reflectivity of a surface at a plurality of angles. The sensor comprises a quarter pitch graded index lens (78) having first end face (82) and second end face (84) and an optical axis (86). Light is coupled from an optical source (72) to an input position (88) on the first end face. A plurality of detectors are provided, each detector having associated therewith an output position (97-99) on the first end face. Each detector comprises a photodetector (74-76) and a fiber optic cable (94-96) for coupling light from the associated output position to the photodetector. The second end face of the lens is positioned adjacent a surface. Light reflected from the surface at a particular angle is focused by the lens to a particular output position, and thus to a particular photodetector.
Abstract:
An arrangement for optical multiplexing and demultiplexing. The multiplexer comprises an optical output waveguide and a plurality of optical input waveguides coupled to the output waveguide by nonblocking optical switches. An electrical activation signal at a switch causes light entering the switch through the associated input waveguide to appear on the output waveguide. The activation signals are provided by a pulse traveling down an electrode past the optical switches, such that parallel input signals on the input waveguides are time multiplexed onto the output waveguide to produce a serial output signal. A similar arrangement is provided for a demultiplexer comprising one input waveguide and a plurality of output waveguides.
Abstract:
Homo and co polymers of di-perfluoroalkyl containing acrylate and methacrylate monomer derivatives of the formula: ##STR1## where R.sub.f is perfluoroalkyl, omega-hydroperfluoroalkyl, or perfluoroalkoxy substituted perfluoroalkyl;R.sub.1 is alkylene of up to 12 carbon atoms;X is --S-- or --SO.sub.2 --;Alk is alkanetriyl having from 1 to 12 carbon atoms;.phi. is phenylene which is unsubstituted or substituted by chlorine, bromine, alkyl of 1 to 6 carbon atoms or alkoxy of 1 to 6 carbon atoms;n is 0 or 1;R.sub.2 is alkylene of up to 12 carbon atoms; andR.sub.3 is hydrogen or methyl; their preparation and use as hydrophobic and oleophobic finishes are disclosed.
Abstract:
An apparatus is provided for use in determining the distance and velocity of a distant object. The apparatus employs a low energy optical radiation source that emits identical external and internal radiation signals whose wavelengths are swept. The wavelength sweep is induced by varying the magnitude of an electrical input supplied to the optical radiation source. An external ranging system employs common optical means, including polarizing means, to direct the external signal towards a distant object, and to receive a portion of that signal which reflects off of the object. First optical heterodyne means are provided to mix the reflected external signal and a local oscillator signal derived from the external optical radiation signal, to produce an output signal. Means are provided to determine representative values of the frequency of that output signal. An internal processing system directs the internal signal into an optical delay means of a known length. Upon exiting the optical delay means, the delayed internal signal is received by a second optical heterodyne means and mixed therein with a local oscillator signal derived from the internal optical radiation signal. Means are provided to determine a representative value of the frequency of the output signal from the second optical heterodyne means. Additional means are provided to determine the central frequency of the external and internal optical radiation signals. Finally, processor means utilize the representative frequency values derived from the external ranging system and internal processing system, and the central frequency value, to calculate the distance and velocity of the distant object.