Abstract: Linear, melt processable, crosslinkable, thermotropic wholly aromatic ("liquid crystal") polyesters are prepared by polymerizing difunctional stilbene or tolan derivatives as comonomers with non-ethylenically and non-acetylenically unsaturated aromatic diols, dicarboxylic acids, hydroxy acids or reactive derivatives thereof. Shaped structures made from these polyesters are crosslinked using electron-poor monomers, such as maleic anhydride.

Abstract: Novel elastomer/oxymethylene polymer blends are disclosed whose impact strength or resistance has been enhanced, with no appreciable diminution in their outer useful properties, by the inclusion therein of a novel elastomer/oxymethylene graft copolymer compatibilizing agent prepared by grafting polyformaldehyde or oxymethylene copolymer chains onto a halogenated elastomeric polymer by means of a reaction initiated at graft sites, i.e., at the sites of the haloelastomer's halo substituents, using, e.g., an initiated site-forming cationic salt.

Abstract: The manufacture of yarn is disclosed by a machine which coats a filament with synthetic plastics material and then applies discrete textile fibres to the tacky layer. The fibres are obtained by tearing a sliver using toothed wheels. All those parts of the machine which are not essentially in the same environment as the wheels are on the opposite side of partitioning to the wheels. Thus the parts which are separated from the wheels by the partitioning are in a substantially fibre free atmosphere, and can be in a closed, pressurized room thus minimising the flow of fibres to these parts.

Abstract: The invention comprises a package having a pair of concave mating portions and an elastic membrane secured in elastic tension to the periphery of the mouth of each mating portion, the tension being such as to permit the positioning of articles between the membranes. The package is adapted to function as a fluid damped device in which damping results from restricted gas flow and in which the membranes act as a damped compound spring to protect articles positioned therebetween from mechanical shock and vibration.

Abstract: Nucleating agents have been discovered which enable molded articles to be prepared with smooth glossy surfaces from blends of polyethylene terephthalate and polybutylene terephthalate in the "wet state", i.e., without the resin having been subjected to a predrying stage.The present invention is directed to polyalkylene terephthalate resin compositions. Specifically, it is directed to undried blends of polyethylene terephthalate and polybutylene terephthalate resins with nucleating agents which enable these resin blends to be molded into articles with smooth glossy surfaces. In a preferred embodiment, fillers and/or reinforcing materials are added without subjecting the resin to a predrying treatment which has been heretofore necessary in the prior art.

Abstract: This invention provides a process for preparing a stable aqueous emulsion composition which has excellent properties for application as a wet abrasion-resistant paper coating binder. The dispersed copolymer of the aqueous emulsion composition comprises a major proportion of vinyl acetate and a minor proportion of an amino-containing vinyl monomer. An important aspect of the emulsion preparation method is the addition of an aqueous solution of the amino-containing vinyl monomer as a separate feedstream, wherein the amine group in the said vinyl monomer is in the form of an amine-acid salt.

Abstract: An improved process for the thermal stabilization of an acrylic fibrous material or film is provided. The fibrous material or film initially is contacted with aniline provided at an elevated temperature. Such aniline treatment (as described) has been found to render the fibrous material or film capable of undergoing thermal stabilization on a more expeditious basis. Subsequently the resulting fibrous material or film is heated in an oxygen-containing atmosphere at a temperature of approximately 200.degree. to 360.degree. C. until a stabilized fibrous material or film is formed.

Abstract: The present invention provides an improvement in a process for providing a dyed, false twist texturized, fibrous material comprising at least 85 mole percent polyethylene terephthalate which is subject to variations in dye uptake induced by the false twist texturizing treatment conducted on said fibrous material prior to or concurrently with a dyeing process by enhancing the uniformity of dye uptake of the fibrous material. The enhancement in the uniformity of dye uptake is achieved by subjecting the fibrous material, which has been previously oriented but prior to false twist texturizing, to an annealing step at a specifically defined temperature for a specifically defined length of time while controlling the length of the fibrous material in a specifically defined manner.

Abstract: A core extender and seal are provided which may be used in combination with cartridge filters. The core extender includes a body having first and second ends which are connected by longitudinal communication means through the core extender body. A radially extending shoulder extends from the body and is axially spaced from at least one end of the body, and preferably is a flange having on at least one lateral surface thereof an annular sealing ring. An external surface extends from at least one end to the radially extending shoulder. The portion of the body defined by an external surface may be inserted into the longitudinal bore of the filter cartridge in order to perform a sealing and connecting function between adjacent filters or a cartridge filter and the filter housing.

Abstract: An improved apparatus for cutting material such as filamentary tows into predetermined lengths comprising (a) a cutting assembly including a plurality of spaced apart knife edges secured to a mounting member at equal radial distances from a point on said mounting member thereby forming a reel, each of said radial distances in every instance being less than the distance from said point to the periphery of said mounting member; (b) said cutting assembly having means adapted to receive successive wrappings of material to be cut in contact with a plurality of said knife edges so that no relative movement occurs between said material and said knife edges longitudinally of said material; and (c) means for forcing said material between adjacent knife edges thereby severing said material into lengths of controlled dimensions, wherein the improvement comprises: means for preventing at least most of said knives from moving in a direction longitudinal of said knife edges.

Abstract: An improved process for the manufacture of stretched polymeric films. In this process more than two plies of polymeric film are simultaneously stretched. The process of this invention is particularly applicable to those films which must remain free of surface irregularities. For example, the properties of microporous polymeric films are significantly improved by the process of this invention.

Abstract: Aqueous polymeric emulsions are formed by the inter-polymerization reaction product of at least one monomer having a reactive CH.sub.2 =C< group (e.g., vinyl acetate and alkyl acrylates) and an alkyd resin which is modified by the incorporation therein of certain ethylenically unsaturated monomers.

Abstract: Pyridine is prepared by reacting acetaldehyde, ammonia and oxygen at elevated temperatures and in the presence of a condensation catalyst, the oxygen (or air) oxidatively demethylating, in situ, the picolines and/or higher condensation products produced along with pyridine. A second embodiment includes incorporating methanol in the above reaction mixture. A third embodiment includes incorporating isobutyraldehyde in the above reaction mixture. These processes obviate the need for formaldehyde as a reactant.

Abstract: An improved thermoplastic molding resin comprising intimately blended polybutylene terephthalate polymers or polypropylene terephthalate polymers, and reinforcing agents in the presence of a thermoplastic phenoxy resin.

Abstract: An improved stuffer box crimper and a process employing such apparatus, the process involving feeding a tow of parallel filaments in the form of a sheet of constant thickness into a stuffer box crimper in which a primary crimp is imparted to the filaments by controlling the pressure against which the tow is delivered to the stuffer box and the secondary crimp is imparted to filaments by adjusting the denier per inch width at which the tow is delivered to the stuffer box, the imparted crimp being heat set by heating with a fluid while the tow is in the stuffer box.

Abstract: An improved process is provided for the production of polymeric filamentary material or film. Molten melt-spinnable polymeric material capable of undergoing crystallization (e.g., a polyester) is extruded through a shaped orifice to form a filamentary material or film under high stress conditions, quenched to below its glass transition temperature to form a solid filamentary material or film, and sequentially passed for a brief residence time through a thermal conditioning zone at a temperature between its glass transition temperature and its melting temperature wherein the internal structure thereof is modified and substantial crystallization of the previously solidified filamentary material or film takes place. The filamentary material or film is withdrawn from the conditioning zone at a rate of 1000 to 6000 meters per minute while under a relatively high stress of about 0.1 to 1.0 gram per denier.

Abstract: An apparatus for the continuous filtration and flow of molten thermoplastic polymer from a melt source to a shaping apparatus. The apparatus is characterized by the employment of a melt reservoir whose level is regulated by a level control means. Melt flow to the shaping apparatus is regulated by the level control means which controls the flow rate from the melt source as a function of the level in the melt reservoir.

Abstract: A synthetic material adapted for use in smoking products which, upon combustion, yields a lower amount of smokestream components which may be deleterious to the smoker than does tobacco, while having an acceptable smouldering rate and taste is prepared by the combination of a combustible material, such as carboxymethyl cellulose with a portion of a filler material.

Abstract: Blow molded polybutylene terephthalate articles and a process for making them. A polybutylene terephthalate melt at a temperature in the range of the melt temperature of polybutylene terephthalate and 495.degree.F., and having an intrinsic viscosity of at least 1.05 deciliters per gram is blow molded in an extrusion blow molding apparatus the mold of which is maintained at a temperature of less than 150.degree.F. to produce polybutylene terephthalate blown articles possessing excellent strength characteristics. Bottles, especially aerosol pressurized bottles, are a primary application of the type of articles produced by this process.