Abstract: A process for increasing the relative viscosity (RV) of a reactant polyamide and to products produced by the process. The process includes contacting the reactant polyamide and a chain extender compound, forming the product, and quenching the product when its RV is near its maximum calculated RV value.

Abstract: A process for increasing the relative viscosity (RV) of a reactant polyamide and to products produced by the process. The process includes contacting the reactant polyamide and a chain extender compound, forming the product, and quenching the product when its RV is near its maximum calculated RV value.

Abstract: Polyamides including functional groups and methods of preparing such polyamides. The polyamides are useful, for example, to prepare filaments.

Abstract: A process for increasing the relative viscosity (RV) of a reactant polyamide and to products produced by the process. The process includes contacting the reactant polyamide and a chain extender compound, forming the product, and quenching the product when its RV is near its maximum calculated RV value.

Abstract: Raw material powder for a bismuth oxide superconductor is molded with addition of an organic vehicle, and the molded raw material is heat treated for removing the organic vehicle before the molded raw material is metal-coated. In this heat treatment, conditions not more than those expressed as T=-1.5.times.logH+600 are applied as to relation between temperature (T) and time (H). Thus, phase transformation of 2212 phases mainly composing the raw material is suppressed so that a large amount of 2223 phases having a relatively high critical temperature are formed when heat treatment is performed after metal coating.

Abstract: Methods of forming composite articles of superconducting materials and metal at ambient temperature by applying a mixture of metal and binder to a ceramic oxide preform to yield a coated preform which is then heat treated to provide composite articles of superconducting ceramic and metal.

Abstract: A rigid composite of a polyester, phenolic, or polyamide resin matrix reinforced with continuous filaments of a p-aramid coated with an adhesion modifier.

Abstract: Microcrack resistant composites are prepared by precoating and prepregging woven fabrics of poly(phenylene terephthalamide) fiber at low warp tension.

Abstract: A filament-wound pressure vessel constructed of a rigid composite of an epoxy resin matrix reinforced with continuous filaments of a p-aramid coated with an adhesion modifier.

Abstract: A rigid composite of an epoxy resin matrix reinforced with continuous filaments of a p-aramid coated with an adhesion modifier.

Abstract: A poly(conjugated polymethine-type)dye which is the polycondensation reaction product in the presence of strong protic acid of an aromatic polyamine and a dicarbonyl compound. These polymers are useful in the fabrication of optical recording elements and in other electronic applications.