Abstract: The invention relates to a moldable thermoplastic resin composition comprising:(a) 99.95-25% by weight of at least one polyamide-containing compound,(b) 0.05-5% by weight of at least one compound selected from the group consisting of magnesium-, zinc- and aluminium salts, and optionally(c) 0-70% by weight of at least one additive compound, which resin composition has an apparent melt viscosity according to ISO 11443 of less than 100 Pa.s, at a shear rate of 1000 s(-1) and at 0.1% by weight moisture content of the resin composition in the form of granules.This invention furthermore relates to molded articles comprising such a thermoplastic resin composition.

Abstract: Copolyether ester elastomers are provided which contain epoxide compounds. The compositions show improved bloom resistance in the presence of diamines with minimum increase in melt viscosity. Also disclosed are methods to improve appearance and eliminate bloom from finished products comprising thermoplastic copolyesters by lowering the level of acid terminated oligomers in the thermoplastic copolyesters with epoxide compounds.

Abstract: This invention relates to flame retardants for polyester and polyamide compositions, and specifically relates to compositions containing (1) about 30 to about 70 weight percent of a polyester or a synthetic, aliphatic polyamide and synthetic aliphatic, aromatic polyamide copolymers or a mixture thereof; (2) about 15 to about 40 weight percent of glass or mineral reinforcing agent; and (3) a flame retardant of (a) about 5 to about 45 weight percent of melamine polyphosphate; (b) about 15 to about 30 weight percent of melamine polyphosphate and up to about 10 weight percent of a charring catalyst; (c) about 15 to about 30 weight percent of melamine polyphosphate, up to about 10 weight percent of a charring catalyst and up to about 10 weight percent of a char former, wherein all percents by weight are based on the total weight of (1)+(2)+(3) only.

Abstract: An aromatic polyamide resin composition composed of two types of aromatic polyamide (A) and (B), where (A) is an aromatic polyamide wherein the molar ratio of aromatic polyamide with respect to the monomer components that constitute the polyamide is 0.4 or greater, and (B) is an aromatic polyamide containing an aromatic monomer as the monomer component that constitutes the polyamide and has a recrystallization temperature that is lower than that of the aromatic polyamide (A), where said aromatic polyamide resin composition has a recrystallization temperature that is 10.degree. C. or more lower than the recrystallization temperature of the aromatic polyamide (A).Merit:The aromatic polyamide composition of the present invention has the high heat resistance characteristic of aromatic polyamides, superior dimensional stability with respect to water absorption, and maintenance of physical stability and chemical resistance, while providing improved molding characteristics.

Abstract: Partially fluorinated compounds of specified formulas that are useful as chemical intermediates and monomers are disclosed. Partially fluorinated polymers prepared from one of these compounds are also disclosed. Fluoro-2,2-dimethyldioxolanes and copolymers thereof are further disclosed.

Abstract: A novel procedure for molding composite structures is disclosed wherein the finished part exhibits a net shape geometry requiring minimal further machining and displaying enhanced consolidation and surface characteristics. A composite preform having a hollow core portion containing a polymer insert is introduced into a mold cavity. One end of the preform core is sealed and the preform together with the polymer insert is heated to melt the composite matrix and core polymer. Pressure is applied to the core at the other end of the part, causing radial expansion of the part against the molded cavity and consolidation of the composite into a finished part. A product finished part is also disclosed and is useful as a component of an orthopedic implant.

Abstract: Methods are described for preparing aluminum nitride of controllable morphology for ceramic and heat conduction applications. The methods comprise forming spherical particles or flakes of an intermediate, RAlNH, followed by heating the spheres or flakes of RAlNH at elevated temperatures to produce high purity aluminum nitride of corresponding morphology. Spheres of RAlNH are formed by (i) freezing a suspension of RAlNH in a liquid medium and thawing, by (ii) aging the suspension, or by (iii) dissolving RAlNH in a liquid medium and precipitating it. Flakes are formed by freezing a suspension of RAlNH in a liquid medium and removing frozen medium from the frozen suspension.

Abstract: Optical elements comprising noncentrosymmetric crystalline organic compounds are provided, that are capable of second harmonic generation. The invention further provides for nonlinear optical devices and modulators incorporating the optical elements.

Abstract: A process for increasing the molecular weight of a polyamide in the presence of alumina-containing titanium dioxide, said process comprising heating a polyamide containing terminal carboxy and amino groups, and alumina-containing titanium dioxide, in the presence of a catalytically effective quantity of at least one phosphonic acid catalyst and/or ester thereof selected from:R(CH.sub.2).sub.n PO.sub.3 R.sup.1.sub.2 (I)wherein:R is 2-pyridyl or 2-methoxyphenyl;each R.sup.1 is independently selected from H or C.sub.1-10 alkyl; andn is 0 or an integer of from 2-5 with the proviso that n is 0 when R is 2-methoxyphenyl.

Abstract: This invention relates to a low-temperature process for the preparation of group III-group V semiconducting material. More particularly, in the present process at least one group III compound is reacted with at least one group V compound in an aprotic solvent to form a precursor, which is then heated to form the semiconducting material.

Abstract: This invention concerns compounds that are pyridine analogues of saccharin and that are synthetic sweeteners, compositions containing them, and their methods of use as sweetening agents.

Abstract: Preparation of high yields of tetrafluoroethylene by preferably contacting pentafluoroethane and/or trifluoromethane with hot gas, preferably argon (.gtoreq.2000.degree. K.) followed by rapid cooling of the reaction mixture, in less than one second, i.e., 0.001 to 0.1 second, to a temperature .gtoreq.800.degree. K.

Abstract: This invention relates to an improved process for increasing the molecular weight of a polyamide.

Abstract: A method for producing site-specific recombination of DNA in eukaryotic cells at regions designated lox sites is disclosed.

Abstract: The process for separating the proteinaceous materials from nucleic acids involves contacting a solution containing the proteinaceous materials and nucleic acids with a solid phase extraction material capable of binding proteins to form bound and unbound fractions and then isolating the unbound fraction containing the nucleic acids.

Abstract: The invention provides a process for the preparation of nitromethylene heterocyclic compounds of general formula ##STR1## wherein R.sup.1 represents a hydrogen atom or a formyl or acetyl group, each moiety R.sup.2 is independently selected from hydrogen atoms and C.sub.1-4 alkyl and benzyl groups, and n is 2 or 3, which process comprises reacting an alkali metal methylnitrodithioacetate with a compound of formulaH.sub.2 N--(CR.sub.2.sup.2).sub.n --OSO.sub.3 H (II)wherein R.sup.2 and n are as defined above, optionally followed by conversion of the resulting compound of Formula I wherein R.sup.1 is hydrogen to the corresponding compound of Formula I wherein R.sup.1 is formyl or acetyl. Certain compounds of Formula I are known insecticidally active compounds.