Abstract: Polyester blends of polyethylene terephthalate and polyethylene isophthalate coated with an alkylene carbonate such as ethylene carbonate or propylene carbonate crystallize more quickly and at lower temperature than uncoated pellets, reducing the tendency of the pellets to stick together during the crystallization process prior to solid-state polymerization.

Abstract: Polyethylene naphthalate pellets coated with an alkylene carbonate such as ethylene carbonate or propylene carbonate crystallize more quickly and at lower temperature than uncoated pellets, reducing the tendency of the pellets to stick together during the crystallization process prior to solid-state polymerization.

Abstract: Polyester prepolymer granules with open-ended cavities provide greatly improved solid state polymerization rates by improving reaction by-product diffusion characteristics.

Abstract: Polyester prepolymer granules with open-ended cavities provide greatly improved solid state polymerization rates by improving reaction by-product diffusion characteristics.

Abstract: It is desirable to increase the modulus of rubbers utilized in a wide variety of applications. This invention discloses a technique for preparing high modulus rubber compositions. By utilizing this technique, high modulus can be attained without sacrificing other properties, such as hysteresis. The subject invention more specifically relates to a process for preparing a high modulus rubber composition which comprises: (1) polymerizing at least one diisocyanate with at least one member selected from the group consisting of diols and diamines in a polymer cement of a rubbery elastomer under conditions which result in the formation of a rubber cement having the crystalline polymer dispersed therein; and (2) recovering the high modulus rubber composition from the rubber cement.

Abstract: It is desirable to increase the modulus of rubbers utilized in a wide variety of applications. For example, it is typically desirable to increase the modulus of rubber compounds which are utilized in tire tread base compositions and in tire wire coat compounds. Unfortunately, most conventional techniques for increasing the modulus of a rubber compound are detrimental to other rubber properties, such as hysteresis and cut growth resistance. By utilizing the techniques of this invention rubber compounds can be prepared which exhibit high tensile strength, high modulus, and good cut growth resistance. The subject invention specifically relates to a process for preparing a highly dispersed blend of a polyester in an elastomer which comprises (1) blending a solution of a rubber in an organic solvent with a solution of a polyester in an organic solvent to produce a dispersion containing said rubber and said polyester, and (2) recovering the highly dispersed blend from the dispersion.

Abstract: A method of preparing a fiber reinforced elastomer by forming fibers therein in-situ and an elastomer made thereby are provided. In the method, a fiber forming material, preferably a high performance polymer, is dissolved in a compatible solvent to form a solvent/polymer mixture, and the mixture is added to the elastomer during compounding or mixing. The polymer is quickly dispersed into the elastomer, and the solvent rapidly evaporates. The shear of the mixer causes elongation of the polymer into fibers. The fibers may also be oriented by the shear of the mixer.

Abstract: It has been determined that the mechanical and thermal properties of polyesters can be improved by incorporating hydroxyalkyl trimellitic imides therein. Such polyesters are comprised of repeat units which are derived from (a) at least one diacid component, (b) at least one diol component, and (c) at least one hydroxyalkyl trimellitic imide.

Abstract: Solution or lacquer adhesives are utilized in a wide variety of applications. Such adhesives are particularly useful because they can be easily applied to a substrate. This invention relates to a copolyester which is particularly useful as an adhesive which is comprised of repeat units which are derived from (a) diacid component which is comprised of (1) from 0 to 60 mole percent terephthalic acid and (2) from 40 to 100 mole percent of at least one aliphatic dicarboxylic acid containing from 4 to 12 carbon atoms; (b) a diol component which is comprised of (1) from 0 to 75 mole percent neopentyl glycol and (2) from 25 to 100 mole percent ethylene glycol; and (c) hydroxymethyl benzoic acid.

Abstract: The labor costs associated with manufacturing wooden articles often represent a substantial portion of the total cost of producing the wooden article. This invention discloses a polymeric composition which can be easily molded into articles which have physical properties which are very similar to those of wood. By utilizing the polymeric composition and techniques of this invention, it is possible to manufacture a wide variety of wood-like articles by molding at reduced costs. This invention specifically reveals a polymeric composition which can be molded into articles having wood-like physical properties which is comprised of (1) from about 80 to about 99 weight percent polyethylene terephthalate, (2) from about 1 to about 20 weight percent of a polycarbonate, and (3) from about 0.3 to about 2 weight percent of 5-phenyltetrazole. These polymeric compositions can be prepared utilizing scrap polyethylene terephthalate, such as recycled polyethylene terephthalate beverage bottles.

Abstract: Polyethylene naphthalate is a polyester resin that is highly useful in numerous applications. For instance, polyethylene naphthalate can be molded into a wide variety of products which have outstanding properties. However, polyethylene naphthalate does not crystallize rapidly at temperatures which are normally used in molding operations. This invention discloses a modified polyethylene naphthalate which crystallizes rapidly at much lower temperatures than does polyethylene naphthalate homopolymer. The modified polyethylene naphthalates of this invention contain a small amount of polyether glycol. This invention more specifically relates to a polyester comprised of repeat units which are derived from (a) a naphthalate dicarboxylic acid and (b) a diol component which is comprised of (1) at least one glycol containing from 2 to 12 carbon atoms and (2) from about 1 to about 12 weight percent of at least one polyether glycol based upon the total weight of the polymer.

Abstract: The labor costs associated with manufacturing wooden articles often represent a substantial portion of the total cost of producing the wooden article. This invention discloses a polymeric composition which can be easily molded into articles which have physical properties which are very similar to those of wood. By utilizing the polymeric composition and techniques of this invention, it is possible to manufacture a wide variety of wood-like articles by molding at reduced costs. This invention specifically reveals a polymeric composition which can be molded into articles having wood-like physical properties which is comprised of (1) from about 80 to about 99 weight percent polyethylene terephthalate, (2) from about 1 to about 20 weight percent of a polycarbonate, and (3) from about 0.3 to about 2 weight percent of 5-phenyltetrazole. These polymeric compositions can be prepared utilizing scrap polyethylene terephthalate, such as recycled polyethylene terephthalate beverage bottles.

Abstract: High molecular weight polyester resins are sometimes produced from low molecular weight polyester prepolymers having the same composition by solid state polymerization. Polyester prepolymers are generally converted from the amorphous state to the crystalline state prior to solid state polymerization in order to raise their sticking temperature. This is done in order to keep the polyester prepolymer from sticking together as a solid mass in the solid state polymerization reactor. Such polyester prepolymers have traditionally been crystallized by heating them to elevated temperatures. It has been found that polyester prepolymers can be crystallized by exposing them to the vapors of certain volatile organic compounds. By utilizing such vapors to crystallize polyester prepolymers the need for a thermal crystallization step can be eliminated.

Abstract: It has been determined that the mechanical and thermal properties of polyesters can be improved by incorporating bis-hydroxyalkyl pyromellitic diimides therein. Such polyesters are comprised of repeat units which are derived from (a) at least one diacid component and (b) a diol component which is comprised of (1) from 2 to 90 mole percent of at least one bis-hydroxyalkyl pyromellitic diimide and (2) from 10 to 98 mole percent of one or more members selected from the group consisting of glycols containing from 2 to 12 carbon atoms and glycol ethers containing from 4 to 12 carbon atoms.

Abstract: Polyester compositions which are dispersible or soluble in water based systems can be very valuable as adhesives, coatings, paints, and the like. The use of water based solvent systems eliminates recovery and toxicity problems normally related with many organic solvents. The polyester compositions of this invention have an increased affinity for water based systems by the incorporation therein salts of organic sulfonic acid monomers and by carboxyl terminating these polyesters to a very substantial degree. The water based systems in which these modified polyesters are useful contain an alcohol in addition to water.

Abstract: Polyester compositions which are dispersible or soluble in water based systems can be very valuable as adhesives, coatings, paints, and the like. The use of water based solvent systems eliminates recovery and toxicity problems normally related with many organic solvents. The polyester compositions of this invention have an increased affinity for water based systems by the incorporation therein salts of organic sulfonic acid monomers and by carboxyl terminating these polyesters to a very substantial degree. The water based systems in which these modified polyesters are useful contain an alcohol in addition to water.

Abstract: A blend of about an equivalent of a carboxyl terminated polyester having a carboxyl end group equivalent weight of 900 to 1200 with 0.8 to 1.2 equivalents of an epoxy curing agent having an equivalent weight of about 70 to 1000, 0 to 50% by weight of a copolyester melt adhesive and sufficient powdered metal to make 20 to 70% but preferably about 30 to 50% metal by weight based on recipe without the copolyester melt adhesive.

Abstract: This invention relates to random elastomeric copolyesters containing units of low molecular weight glycol, poly(alkylene oxide)glycol, dimer acid and 1,2 bis(4-carbomethoxy phenoxy)ethane.

Abstract: Water soluble polyester compositions which, upon cure, are water insoluble. These water-based polyesters are made utilizing hydantoin compounds with salts of a compound containing a sulfo acid group therein. Such compositions are useful as coatings, paints, and the like and eliminate any recovery problems or toxicity problems normally related with many organic solvents.

Abstract: An elastomeric copolyester resin having high melt strength and capable of being blow-molded. The copolyester resin is made by adding to the polymerizing or initial mixture small amounts of an alkali salt of a dialkyl sulfoisophthalate. The copolyester resin contains units of terephthalic acid, butane diol, polytetramethylene glycol, and dimer acid.