Abstract: Novel linear random copolyesters which exhibit a high degree of solubility in organic solvents, are completely or essentially free of cyclic oligomeric contaminants and are useful for bonding metallic oxide pigments to magnetic tape substrates.

Abstract: Polyurethane compositions containing milled glass fibers alone tend to have anisotropic properties. This effect is cured by adding an effective amount of mica, preferably about 22 to 25 percent for each 5 to 8 percent of milled glass fiber.

Abstract: This invention relates to a solid state polymerization apparatus comprising a vertically oriented tube through which particulate resin flows downwardly in a plug flow fashion to the cone-shaped bottom portion of the reactor. The apparatus contains as an improvement a resin distribution means in the top portion thereof to distribute added resin in an orderly fashion to maintain a uniform level of polymer and also a double cone perforated gas distribution means in the bottom thereof to prevent backmixing and assure that a uniform plug flow condition is maintained as the polymer descends down the apparatus to a discharge valve at the bottom thereof.

Abstract: A copolyester resin having minimal carboxyl terminated ends, is disclosed, as well as the method for making it. The esterification-condensation reaction is employed reacting a diol, a dicarboxylic compound, and a chain branching agent. The chain branching agent is limited in concentration to less than 10 mole percent of the dicarboxylic compound and is charged prior to the condensation stage of the reaction. The copolyester resin so produced achieves minimal carboxyl terminated ends, which when used in coatings, yields a clear resin free of carbon dioxide impurities.

Abstract: The invention relates to copolyesters of ethylene terephthalate-tetrachlorobenzenedimethylene terephthalate. They can be random or block copolyester. The products have high second order transition temperatures and can be formed into products that can be sterilized.

Abstract: This invention comprises an improvement in the preparation of high molecular weight polyester, said improvement comprising simultaneously and continuously crystallizing, drying and heating low molecular weight particulated, melt polymerized linear condensation polyester prepolymer resin by subjecting said prepolymer resin to a high frequency energy field in the range from about 20.0 to about 300 megahertz for a period of time ranging from about 20 to 90 seconds.

Abstract: This invention relates to random linear copolyesters containing units of terephthalic acid, butane diol, polytetramethylene glycol and dimer acid. The copolymers are elastic materials and can be made into films, fibers and molded products.

Abstract: The invention relates to the removal of acetaldehyde from crystalline polyethylene terephthalate granules by passing a dry inert gas through a bed of resin at a temperature of 170.degree. C. to 250.degree. C. for a time sufficient to remove the aldehydes.

Abstract: Novel compositions of matter comprising polymethylene terephthalate t-butyl isophthalate copolyesters wherein the t-butyl isophthalate repeating units range from 1 to 50 mole percent and the ethylene terephthalate repeating units range from 99 to 50 mole percent, said percentages being based on the sum of the moles of ethylene terephthalate and t-butyl isophthalate repeating units in said compositions.

Abstract: A method for decreasing the amount of ether as a by-product in polyesters (for example terephthalic-based) by initially utilizing a deficient amount of a glycol (for example, ethylene glycol) in the early reaction stages and utilizing an excess of the glycol in the final or end stages. The polyesters produced are of better quality, have a high melting point, possess increased thermal stability, and yield improved fiber properties.

Abstract: This invention relates to a method for the removal of vinyl chloride monomer from polyvinyl chloride resins by lowering the Tg (glass transition temperature) of the polyvinyl chloride resins at an elevated temperature while in the presence of reduced pressure thus allowing the vinyl chloride monomer to escape from the polyvinyl chloride resins.

Abstract: The invention relates to polymers containing units of indane, 1-pentene and 2-pentene. These polymers can be formed by the polymerization of meta- or para-diisopropyl benzene diol or by the polymerization of meta- or para-diisopropenyl benzene in the presence of acid activated clay or other acidic catalysts.

Abstract: The present invention provides as compositions of matter, linear random copolyester resins having intrinsic viscosities ranging from 0.5 to 1.0 deciliters per gram, said copolyester resins being the polymeric reaction products of a mixture of reactants consisting of ethylene glycol, terephthalic acid or a lower C.sub.1 -C.sub.4 dialkyl ester thereof, phthalic acid or phthalic anhydride, and an aliphatic dicarboxylic acid or lower C.sub.1 -C.sub.4 dialkyl ester thereof and said copolyester resins having utility as solution adhesives.

Abstract: This invention relates to copolyesters for making containers by blow molding. The copolyesters are crosslinked just short of network formation to the point of forming gel to improve the strength of the copolyesters in molten state to the point that a pre-form maintains its shape and size and does not sag at molding temperature.

Abstract: The invention of this application relates to strings for game rackets which are formed of large monofilaments of thermoplastic, fiber-forming resin in which the monofilaments are twisted to form a bundle and two or more bundles are cabled and twisted in the opposite direction from the twist of the bundle, the composite string being oriented and heat set to prevent unravelling of the string. The strings are laced into a game racket such as a tennis racket under a tension of about 50 pounds to form a racket which has good playing properties as well as tensile retention and good resilience retention.

Abstract: This invention concerns a method for the removal and recovery of synthetic polymers from solvents using dropwise impingement of a solution of the polymer in a solvent upon a mobile capillary inactive liquid surface to volatilize and recover the solvent, leaving the previously dissolved synthetic polymer on the surface of the capillary inactive liquid. The solvent is recovered by condensation for reuse and the polymer is recovered from the surface of the liquid by mechanical means.

Abstract: The invention relates to an improvement in the solid state polymerization of polyester prepolymer comprising the use of low molecular weight prepolymer having an intrinsic viscosity ranging from about 0.1 to about 0.35 and essentially in the form of discrete spherical beads.

Abstract: The invention relates to a process for preparing high molecular weight polyester resin by reacting ethylene glycol with terephthalic acid in the absence of a catalyst and polymerizing the product under solid state polymerization conditions to form high molecular weight polyester.

Abstract: The invention relates to a process for preparing catalyst-free high molecular weight polyester resin by preparing a low polymer having an intrinsic viscosity of from about 0.1 to 0.4 said low polymer being essentially free of catalyst and polymerizing the low polymer under solid state polymerization conditions to form high molecular weight polyester.

Abstract: This invention relates to thermosetting copolyesters of terephthalic acid, trimellitic acid and neopentyl glycol units. The compositions can vary from about 95/5 neopentyl terephthalate trimellitate to about 85/15 neopentyl terephthalate trimellitate. They can be cured to form excellent coatings on industrial goods and consumer items such as outdoor furniture.