Abstract: A process for preparing extended chain polyesters, and block or graft polyester or copolyesters by forming an intimate mixture of one or more polyesters and an effective amount of one or more phosphite compounds, and thereafter heating the intimate mixture at a temperature and for a time sufficient to form the desired amount of the desired polyester or co-polyester.
Abstract: Uranium is extracted from phosphoric acid with organophosphorus extractants supported or impregnated on polymeric resins, and especially macroreticular resins. Suitable extractants include mono and dialkylphenyl esters of phosphoric acid. Uranium may be stripped from the supported or impregnated resins with hotter or more concentrated phosphoric acid, optionally with oxidation to hexavalent form, or with aqueous fluoride solutions.
Abstract: The present invention provides a novel apparatus and process for vaporizing a liquid and condensing the vapors thereof. The apparatus and process utilize heat of compression for vaporizing the liquid. The apparatus includes a still (10), a closed refrigeration system (12), an auxiliary condensing coil (24) separate from refrigeration system (12), and a valve (28) for controlling heat extraction by auxiliary coil (24). In a particularly useful embodiment, the apparatus further includes a trough (41) for collecting the condensed vapors. The trough is located within still (10). Auxiliary coil (24) extracts from the vapors, heat in excess of that necessary to maintain thermal balance in the apparatus.
Abstract: A low shrinkage, dimensionally stable, polyester fiber is produced by a process which involves conditions of continuously spinning and drawing filaments wherein the filaments are passed through a steam impinging draw point localizing jet (25) at a temperature of about 482.degree. C. to 580.degree. C. to thereby heat the filaments substantially immediately above their second order transition temperature. The low shrinkage polyester fibers are particularly useful in the preparation of tires and industrial products, including industrial belts, conveyor belts, and reinforced elastomeric structures.
Abstract: A fiber finish composition, a process which includes treating polyester yarn therewith and polyester yarn so treated are all disclosed. The fiber finish composition comprises a triglycidyl ether of glycerol; a low viscosity diglycidyl ether having the structural formula ##STR1## wherein R is alkylene or arylene; ethoxylated castor oil; an epoxy silane having the structural formula ##STR2## wherein n=2 to 5; and a solvent. The process comprises the steps of (1) heating the yarn to a temperature of about 150.degree. C. to 230.degree. C. and (2) treating the yarn with the fiber finish composition, preferably utilized as an aqueous overfinish. The yarn is preferably used in tire cords for the construction of pneumatic passenger tires and results in excellent adhesion of tire cord to rubber.
Abstract: A method is disclosed to purify crude phenol containing acetol and alpha-methyl styrene prior to hydrogenation to cyclohexanone comprisingcontacting the crude phenol with a catalyst whileheating the crude phenol and catalyst to a temperature between about 140.degree. C. and 190.degree. C.at a pressure between about atmospheric and about 70 psigin an inert atmosphereso that the catalyst causes a reaction between the impurities acetol and alpha-methyl styrene to form cumene and pyruvic aldehyde, thenheating the resultant compounds for a period of 0.1 to about 6 hours under an inert gas sweep at a temperature of from about 150.degree. C. to about 190.degree. C. until the pyruvic aldehyde has decomposed and its decomposition products are swept away in the gas sweep.
Abstract: A wetting solution for use in a continuous dyeing process for a fabric comprised of synthetic polymer fibers characterized by a surface energy of about 18 to 20 dynes per centimeter is provided. This solution comprises water, a surfactant having a wetting speed factor of up to 1.75, and a thickening agent. A continuous dyeing process for treating the fabric is also disclosed.
Abstract: Preparation of a fluorocarbon compound used to make a soil-resistant yarn is improved by removing most of the impurities from the fluoro-carbon compound mass with heat and vacuum after the final washing step and then adding an emulsifier to the fluorocarbon compound mass so that the mass can be handled as a liquid concentrate rather than a tacky solid.
Abstract: High molecular weight linear condensation polyesters are stabilized against deterioration by heat by reacting the polyester in molten form with alkylene carbonates in the presence of a catalytic amount of a compound selected from the group consisting of sodium iodide and potassium iodide.
Abstract: An apparatus for making metallic glass powder is disclosed. A jet of a molten glass forming metal alloy is impinged under an acute angle against the inner surface of a rotating cylindrical chill body, whereon it is atomized into a stream of droplets of molten alloy, which again impinge on the chill surface to be rapidly quenched into metallic glass powder.
Abstract: A polyester composition comprising: the sodium salt of a hydrocarbon acid; and the ester of an aliphatic carboxylic acid having at least one carboxyl group and from 2 to 8 carbon atoms; and an alcohol having one hydroxyl group and from 1 to 10 carbon atoms. The sodium salt is preferably sodium stearate and the ester is preferably di(2-ethyl-hexyl)adipate. The composition can be filled and have impact modifiers.
December 22, 1980
Date of Patent:
April 27, 1982
Allied Chemical Corporation
Nicholas Vanderkooi, Jr., Harold W. Tuller
Abstract: This invention is a method to reduce pressure drop in polyamide process piping comprising injecting linear polyethylene glycol having a molecular weight above 10,000 around the periphery of the piping and forming a coating of the polyethylene glycol on the internal surface of the piping where it lubricates the flowing polyamide.
Abstract: A laminate structure comprising at least one layer of a polyamide and at least one layer of polyethylene containing from 0.1 to 20 percent based on the weight of the polyethylene of oxidized high density polyethylene.
December 29, 1980
Date of Patent:
March 30, 1982
Allied Chemical Corporation
Harold W. Tuller, Stephen R. Schulze, George S. Wilson
Abstract: Isotope separation, particularly separation of isotopes of lithium, is achieved by exposing a beam of atoms to radiation that selectively excites atoms of a particular isotope without exciting atoms of other isotopes of that element. The excited atoms are ionized by solar radiation and the ions attracted to an ion collector plate maintained at a negative potential. The atoms not ionized are condensed on a grounded atom collector plate. Optionally, the solar radiation not absorbed by the system may be used to generate electricity. Lithium isotopes are useful in nuclear reactors and nuclear weapons.
Abstract: The present invention provides a novel process for producing 1,2-dichloro-1,1,2,2-tetrafluoroethane substantially free of the 1,1-isomer. The process includes contacting, in the vapor phase, an organic feed composition containing a major amount of the 1,2-isomer and a minor amount of 1,1-isomer with hydrogen in the presence of a hydrodechlorination catalyst. The process selectively degrades the 1,1-isomer. Also provided is a process for producing high purity 1,2-isomer.
December 8, 1980
Date of Patent:
March 9, 1982
Allied Chemical Corporation
William J. Cunningham, Addison M. Smith, Robert A. Wiles
Abstract: A yarn finish composition is disclosed for incorporation with synthetic organic polymer yarn or yarn products to render the same oil repellent and resistant to soiling. The composition comprises (a) a solution of a salt of dioctyl sulfosuccinate, propylene glycol and water, (b) a fluorochemical compound consisting of polycarboxybenzene esterified with certain partially fluorinated alcohols and with hydroxyl-containing organic radicals such as 2-hydroxyethyl, glyceryl, and chlorohydryl or bromohydryl, and (c) a dispersant selected from the group consisting of a salt of a polycarboxylic acid, a salt of a sulfonated naphthalene-formaldehyde condensate, and a salt of an alkyl naphthalene sulfonate.
Abstract: Electrical energy is generated from acid-base neutralization reactions in electrodialytic cells. Permselective bipolar membranes in these cells are contacted on their cation selective faces by aqueous acid streams and on their anion-selective faces by aqueous base streams. Spontaneous neutralization reactions between the basic anions and acidic cations through the bipolar membranes produce electrical potential differences between the acid and base streams. These potential differences are transmitted to electrodes to produce electrical energy which is withdrawn from the cell.
Abstract: Poly(ester aromatic dihydric alcohol) polymers having carbonate moieties, aromatic or cycloaliphatic dicarboxylic acid moieties and carbonate moieties and having high glass transition temperatures (over 100.degree. C.) and being melt processable. At least part of the aromatic dihydric alcohol moieties have the 4-carbon of each of two phenoxies covalently bonded to the same ring carbon of a carbocyclic or heterocyclic moiety. Representative poly(ester carbonates) are formed from bisphenol-A, phenolphthalein, terephthaloyl chloride and phosgene.