Abstract:
Materials, such as metals, alloys and other products are provided with improved wear-resistant surfaces comprised of a hard monocarbide phase in the form of filaments within the material matrix.
Abstract:
Cellular urethane polymers essentially free of the strong, objectionable amine odor characteristic of N-ethylmorpholine, are provided by effecting the polyurethane forming reaction in the presence of beta-tert-amino nitriles. In view of their low residual odor and effectiveness in the catalysis of the waterisocyanate reaction, the beta-amino nitriles either alone or in combination with other tertiary amines, are used with particular advantage as direct replacements for N-ethyl-morpholine in the manufacture of water-blown flexible polyurethanes, both molded and free-rise, including high-resilience foam as well as foams stabilized with either organosilicone or silicon-free organic surfactants. Especially effective for the formation of flexible polyester foam stabilized with either type of surfactant are blends of the beta-amino nitrile catalyst such as, in particular, 3-(N,N-dimethylamino)propionitrile, with dimethylethanolamine or a bis(2-(N,N-dimethylamino)alkyl)-ether.
Abstract:
The disclosure of this application is directed to unsaturated polyesters which are the condensation reaction products of a mixture of an unsaturated dicarboxylic acid or anhydride thereof, ethylene glycol and diethylene glycol; and to compositions based thereon which have particular utility in sheet molding and bulk molding applications to form thermoset articles of desired configuration.
Abstract:
Shaped containers fabricated from material comprising biodegradable thermoplastic oxyalkanoyl polymers, e.g., epsiloncaprolactone polymers, and naturally occurring biodegradable product, e.g., fir bark, said containers possessing a germination medium, and optionally, a seed or seedling therein.
Abstract:
Wastewaters containing alpha, beta-ethylenically unsaturated aldehydes and/or ketones may be rendered non-toxic to biological treatment systems by heating the wastewaters with a slight excess of alkali at elevated temperatures.
Abstract:
Reinforcing fibers are precisely aligned and distributed in a metal matrix by (a) forming a corrugated sheet of the metal, filling the valleys with reinforcing fibers, sandwiching the sheet between two flat sheets of the same metal and subjecting the assembly to pressure and elevated temperatures until the layers of metal matrix become integrally bonded, or (b) placing between two sheets of metal matrix in an alternate or periodic but parallel fashion fibers or rods of both the reinforcing metal and the metal matrix and subjecting the assembly to pressure and elevated temperatures until the metal matrix becomes integrally bonded. Alternatively, in both instances the assembly can be rolled into a cylinder with the reinforcing fibers parallel to the axis of the cylinder and the resulting assembly extruded into a billet or compacted at elevated temperatures.
Abstract:
An improved process for producing carbon fibers from pitch which has been transformed, in part, to a liquid crystal or so-called ''''mesophase'''' state. According to the process, the mesophase content of fibers spun from such pitch is increased before the fibers are thermoset and carbonized by solvent extraction of the non-mesophase content of the fibers.
Abstract:
The cross-sectional configuration of netting made from fusible plastic materials is expanded by fusing the netting between a pair of platens having surfaces that are wet by the fused material, and then pulling the platens apart a predetermined distance to expand the cross-sectional area of the fused material which adheres to the platens.
Abstract:
Integrally formed multicell containers are prepared in an essentially one step, low pressure process by expanding the cross-section of a sheet of thermoformable material with the attendant formation of a plurality of voids or cells having a partial vacuum or reduced pressure within the cross-section of such expanded sheet while venting the voids during the expansion of the cross-section so as to equilibrate the level of pressure within the voids with the level of pressure without the expanded sheet of thermoformable material so as to thereby regulate the uniformity and integrity of the resulting cross-sectional geometry of the expanded sheet, which is a multicell container.