Abstract: Vinyl ethers are prepared by reacting divinyl ether with a primary alcohol in the presence of a catalytic amount of red mercuric oxide and trifluoroacetic acid. The vinyl ethers so produced are particularly useful as monomers which can be polymerized into energetic macromolecular binder materials with excellent mechanical, physical and energetic properties.
Type:
Grant
Filed:
June 10, 1976
Date of Patent:
January 17, 1984
Assignee:
The United States of America as represented by the Secretary of the Air Force
Inventors:
Scott A. Shackelford, Raymond R. McGuire, Robert E. Cochoy
Abstract: A process for synthesizing energetic ethers, esters and acetals is disclosed that comprises reacting certain alcohols with certain alkenes or alkynes in the presence of mercuric or mercurous sulfate. The products obtained are particularly useful as plasticizers, monomers or prepolymers for propellant binder systems.
Type:
Grant
Filed:
September 25, 1974
Date of Patent:
January 3, 1984
Assignee:
The United States of America as represented by the Secretary of the Air Force
Inventors:
Raymond R. McGuire, Robert E. Cochoy, Scott A. Shackelford
Abstract: In a method for detecting flaws in the surface of a workpiece, initially microcapsules containing a fluorescent dye are deposited on the surface. After removal of excess microcapsules from the surface in order to reduce background fluorescence, the surface is visually inspected under ultraviolet light. The method overcomes many of the disadvantages of conventional inspection procedures, e.g., by eliminating use of emulsifiers and by materially shortening processing time.
Type:
Grant
Filed:
September 18, 1979
Date of Patent:
June 16, 1981
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: A phenylmethylpolysilane polymer is prepared by the addition of a small amount of phenylmethyldichlorosilane to dimethyldichlorosilane and reduction of the resulting mixture. The polymer is a gum or meltable resinous material which has utility as a precursor for preparing silicon carbide fibers.
Type:
Grant
Filed:
November 27, 1979
Date of Patent:
April 7, 1981
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: Polymers having pendant phenylethynyl groups are obtained by reacting phenylacetylene with a bromine-containing polymer prepared by reacting bis-p-phenoxy-4,4'-(2,2'-dibromodiphenyl)ketone or 2,2'-dibromodiphenyl-4,4'-dicarbonyldichloride with isophthaloyl dichloride and 4,4'-bis-p-phenoxydiphenylsulfone. Because the polymers cure without the evolution of volatiles and have softening points higher than their cure temperatures, they are especially suitable for use in fabricating fiber-reinforced composites.
Type:
Grant
Filed:
June 8, 1979
Date of Patent:
February 24, 1981
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: F-phenylalkylene oxide acetylenes having the formula C.sub.6 F.sub.5 C.tbd.C(CF.sub.2 OCF.sub.2).sub.n C.tbd.CC.sub.6 F.sub.5, where n ranges from 3 to 8, inclusive. The diacetylenes are useful as monomers for preparing fluorinated polyether elastomers.
Type:
Grant
Filed:
August 28, 1979
Date of Patent:
December 23, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: A method for analyzing a used lubricating oil for iron wear metal content in which all of the iron in a sample of the oil is extracted into an oil immiscible layer, buffering and reducing agents are added, and the iron in the solution is reacted with a chelating agent to forma red complex indicative of the iron content. Apparatus for carrying out the method comprises six containers, one for a lubricating oil sample and each of the other five being for a separate reagent. Also included are a reaction chamber, means for transferring oil sample and reagents from the containers to the reaction chamber which may also function as a test cell.
Type:
Grant
Filed:
April 12, 1979
Date of Patent:
December 9, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Inventors:
Kent J. Eisentraut, William D. Ross, William J. Hillan, Joseph J. Brooks, Thomas G. Duffy
Abstract: A fluorinated polyether is synthesized by (1) reacting perfluoroglutaryl chloride and 1,5-hexafluoropentane diol to provide a fluorinated polyester and (2) converting ester groups of the polyester to ether groups by SF.sub.4 reduction. The product obtained is a thermally stable polyether which is particularly useful in providing an elastomeric material for aircraft fuel tank sealants, tire valves, O-rings, hose, gaskets, and the like.
Type:
Grant
Filed:
April 26, 1979
Date of Patent:
December 9, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: A primer, particularly for aluminum and aluminum alloys, that is free of alkaline materials and consists essentially of an aqueous solution of a water soluble condensation product of (1) phenol, resorcinol or a mixture of phenol and resorcinol and (2) formaldehyde.
Abstract: A sealant composition comprising a non-crosslinked, elastomeric mastic and an extrusion-inhibiting amount of vulcanized rubber particles of irregular shape and having sharp edges and angular surfaces. When the composition is used as a channel sealant, the ability of the particles to deform at structural gaps while offering resistance to extrusion prevents the loss of the elastomeric mastic.
Type:
Grant
Filed:
April 4, 1979
Date of Patent:
November 11, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: A high temperature-resistant, conductive adhesive composition for bonding a semiconductor die to a substrate comprising a mixture of (1) an alloy of gallium-tin eutectic and gold and (2) a polyimide resin.
Type:
Grant
Filed:
December 20, 1978
Date of Patent:
November 11, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: Para-ordered aromatic heterocyclic polymers characterized by having p-benzbisoxazole, p-benzbisthiozole or p-benzbisimidazole units and containing diphenoxybenzene structures. The diphenoxybenzene structures function as "swivels" in the polymer chains, imparting flexibility thereto and making it possible to cast strong films from solutions of the polymers.
Type:
Grant
Filed:
August 24, 1979
Date of Patent:
October 21, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Inventors:
Robert C. Evers, Fred E. Arnold, Thaddeus E. Helminiak
Abstract: Phenolic materials containing propargyl groups are prepared by reacting a polyhydric, phenolic material with propargyl bromide, the reaction being conducted in an aqueous sodium hydroxide solution. The products can be thermally polymerized to polymers which are useful as adhesives and as matrix resins in the fabrication of composites.
Type:
Grant
Filed:
June 14, 1979
Date of Patent:
October 7, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: High molecular weight aromatic enyne polyimide thermoplastics are prepared by reacting an aromatic dianhydride with (E)-3,3'-(1-buten-3-ynylene) dianiline alone or in admixture with an aromatic diamine. Because of the presence of the enyne moiety in the polymer backbone, the polymers can be lightly crosslinked to provide solvent-resistant thermoplastics. The polymers are particularly useful in fabricating graphite-reinforced, thermoplastic composites for structural applications.
Type:
Grant
Filed:
April 24, 1979
Date of Patent:
September 2, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: Diphospha-s-triazines wherein the two phosphorus atoms are substituted by aromatic groups and the carbon atom is substituted by either a perfluoroalkyl or a perfluoroalkylether moiety. The triazines exhibit a broad range of properties and are useful as antioxidant-anticorrosion agents, lubricants, and hydraulic fluids.
Type:
Grant
Filed:
February 7, 1979
Date of Patent:
July 29, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Inventors:
Kazimiera J. L. Paciorek, Reinhold H. Kratzer, Jacquelyn Kaufman, Thomas I. Ito, James H. Nakahara
Abstract: An alloy for brazing a silicon die to a gold-plate kovar header consists essentially of 19 to 21 weight percent tin and 0.6 to 0.8 weight percent silicon with the balance being gold. The alloy melts at a temperature below 200.degree. C. which is substantially lower than that of the conventional gold-silicon eutectic alloy.
Type:
Grant
Filed:
December 12, 1978
Date of Patent:
July 29, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: Rod-like aromatic heterocyclic polymers are used as reinforcement in coil-like heterocyclic polymer matrices to provide composites at the molecular level that are analogous to chopped fiber composites.
Type:
Grant
Filed:
May 3, 1978
Date of Patent:
June 10, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Inventors:
Thaddeus E. Helminiak, Charles L. Benner, Fred E. Arnold, George E. Husman
Abstract: A lanthanide chelate of a fluorinated ligand is used as a nuclear magnetic resonance shift reagent for spectral simplification and clarification. Since the use of the shift reagents of this invention facilitates compound identification and increases the scope of the applicability of nuclear magnetic resonance spectroscopy, the present invention is particularly useful in detecting and analyzing compounds which are or may be pollutants.
Type:
Grant
Filed:
February 4, 1974
Date of Patent:
June 3, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: A photographic developer composition containing Phenidone and hydroquinone in a 1 to 2 weight ratio, the composition having a gamma less than 1 and a pH in the range of about 9.8 to 10.4. The composition is particularly useful as an extended range developer for rapid processing of aerial film.
Type:
Grant
Filed:
January 12, 1979
Date of Patent:
May 27, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force
Abstract: A fluorinated polyether is synthesized by (1) reacting perfluoroglutryl chloride and 1,5-hexafluoropentane diol to provide a fluorinated polyester and (2) converting ester groups of the polyester to ether groups by SF.sub.4 reduction. The product obtained is a thermally stable polyether which is particularly useful in providing an elastomeric material for aircraft fuel tank sealants, tire valves, O-rings, hose, gaskets, and the like.
Type:
Grant
Filed:
December 8, 1976
Date of Patent:
May 6, 1980
Assignee:
The United States of America as represented by the Secretary of the Air Force