Abstract: Copolymers of etherimides and amides have been found to be useful in the coating and molding arts.

Abstract: Copolymers of etherimides and amideimides have been found to be useful in the coating and molding arts.

Abstract: An improved aromatic polycarbonate transesterification process comprising reacting a bis(aryl)carbonate and a dihydric phenol in the presence of a transesterification catalyst, the improvement wherein the catalyst contains an aluminum hydride or borohydride group.

Abstract: A polyester-carbonate transesterification process comprising reacting a bis(ortho-haloaryl)ester, a bis(ortho-haloaryl)carbonate, and a dihydric phenol under transesterification reaction conditions.

Abstract: A method is provided for converting aromatic bis(ether N-organo substituted phthalimides) to aromatic bis(ether anhydrides) by heating a bisphasic aqueous-organic mixture of aromatic bis(ether N-organo substituted phthalimide), phthalic anhydride and an exchange catalyst to effect an imide-anhydride exchange producing an aqueous phase containing aromatic bis 4ether phthalic acid) and an organic phase containing N-organo substituted phthalimide. The aromatic bis(ether phthalic acid) is then optionally dehydrated to the corresponding anhydride.

Abstract: Halo-(carbonyldioxyaryl)ethylenes are prepared by a catalytic process which comprises contacting a halo-bis(hydroxyaryl)ethylene, carbon monoxide, an oxidant, a base, and a Group VIIIB element selected from ruthenium, rhodium, palladium, osmium, iridium or platinum. The resulting halo-(carbonyldioxyaryl)-ethylenes are useful as flame retardents for thermoplastic polymeric materials.

Abstract: A method is provided for continuously converting aromatic bis(ether N-organo substituted phthalimides) to aromatic bis (ether anhydrides) by heating a biphasic aqueous-organic mixture of aromatic bis(ether N-organo substituted phthalimide), phthalic acid and an exchange catalyst in a heated coiled tube reactor to produce an aqueous phase containing aromatic bis (ether phthalic acid) and an organic phase containing N-organo substituted phthalimide which can then be separated and aromatic bis(ether phthalic anhydride) recovered from the aqueous phase.

Abstract: A catalytic electrode is produced by sputter etching the surface of a conductor with ions of an inert gas to remove oxide therefrom and introduce disorder into the surface making it chemically reactive and depositing a catalytic metal on the etched surface of the conductor in at least a catalytic amount.

Abstract: An improved process is described for recovery of some of the bisphenol-A values present in the waste streams in an acid-catalyzed bisphenol-A synthesis process.

Abstract: A positive electrode for use in a lead-sulfuric acid electrolyte battery comprised of a grid supporting a layer of PbO.sub.2, said grid being comprised of an electrically conducting substrate having an adherent, contacting, at least substantially pinhole-free coating of semiconducting metal oxide, the sulfuric acid electrolyte having no significant deleterious effect on the coating and forming a non-corroding oxide with the substrate at sites of pinholes.

Abstract: A hydrogen detector comprised of a substrate supporting an electrically conducting base metal film, an electrically conducting top film of metal able to dissociate hydrogen into atomic form, a polycrystalline film of titanium dioxide sandwiched between the base and top films, the polycrystalline titanium dioxide film electrically insulating the base film from said top film, the base film being in electrical contact with the titanium dioxide film, an insulating layer electrically insulating said titanium dioxide film from said top film except for a predetermined surface portion thereof in electrical contact with said top film, said predetermined electrically contacting portion being at least sufficiently large to produce a measurable electrical conductance, said top and base films being connected to an external circuit to measure conductance, the electrical conductivity of said hydrogen detector varying with the concentration of hydrogen in the atmosphere surrounding it.

Abstract: A hydrogen detector comprised of a substrate supporting an electrically conducting base metal film, an upper electrically conducting duffusion barrier metal film, a polycrystalline film of titanium dioxide sandwiched between the base and diffusion barrier films, said polycrystalline titanium dioxide film electrically insulating the base film from said diffusion barrier film, the base film being in electrical contact with the titanium dioxide film, an insulating layer electrically insulating said titanium dioxide film from said diffusion barrier film except for a predetermined surface portion thereof in electrical contact with said diffusion barrier film, said predetermined electrically contacting portion being at least sufficiently large to produce a measurable electrical conductance, an electrically conducting or non-conducting catalytic top film of metal able to dissociate hydrogen into its atomic form in electrical contact with said diffusion barrier film and at least substantially coextensive with said ba

Abstract: A positive electrode for use in a lead-sulfuric acid electrolyte battery comprised of a grid supporting a layer of PbO.sub.2, said grid being comprised of an electrically conducting substrate having an adherent protective at least substantially pinhole-free shield of electrically conducting material, said shield being composed of a coating of semiconducting metal oxide, or a composite of at least a substantially pinhole-free external coating of semiconducting metal oxide and at least a substantially pinhole-free coating of metal intermediate to the substrate and semiconducting oxide coating, said sulfuric acid electrolyte having a substantially deleterious effect on said substrate but having no significant deleterious effect on the shield.

Abstract: A polycarbonate transesterification process comprising reacting (ortho-alkoxycarbonylaryl)carbonates and dihydric phenol under transesterification reaction conditions.

Abstract: A polycarbonate transesterification process comprising reacting a bis(ortho-haloaryl)carbonate and a dihydric phenol under transesterification reaction conditions.

Abstract: The rate of reaction between acetone and phenol in the presence of an acidic catalyst to form 2,2-bis(4-hydroxyphenyl) propane can be accelerated by employing an aliphatic alcohol with the reactants.

Abstract: A smooth surface of a diamond or cubic boron nitride crystal is bombarded with ions sufficiently to penetrate the surface and impart an ion implanted region in the crystal in a predetermined pattern, the resulting crystal is charged electrostatically, and a powder is applied to the charged smooth surface producing a pattern thereon which is a delineation of the implanted region and can be used to identify or fingerprint the crystal.

Abstract: An improved transesterification process wherein a bis(ortho-nitroaryl)carbonate and a dihydric phenol are reacted to form a polycarbonate under transesterification reaction conditions, the improvement comprising the use of a hypernucleophilic base.

Abstract: Adsorbent composite composed of a high density substrate particle which is non-reactive under conditions of use and which is encapsulated with adherent activated carbon.

Abstract: An improved polycarbonate transesterification process comprising reacting mixtures of bis(ortho-haloaryl)carbonate/-ortho-haloaryl aryl carbonate and a dihydric phenol under transesterification reaction conditions.