Patent application number | Description | Published |
20080255280 | Oxygen-scavenging polymer blends suitable for use in packaging - Polymer blends suitable for packaging are disclosed that include a transition metal; one or more polyamide homopolymers or copolymers; and one or more polyethylene terephthalate homopolymers or copolymers obtained by a melt phase polymerization using a catalyst system comprising aluminum atoms in an amount, for example, from about 3 ppm to about 60 ppm and one or more alkaline earth metal atoms, alkali metal atoms, or alkali compound residues in an amount, for example, from about 1 ppm to about 25 ppm, in each case based on the weight of the one or more polyethylene terephthalate homopolymers or copolymers The polymer blends disclosed exhibit improved oxygen-scavenging activity compared with blends made using polymers prepared with conventional catalyst systems. | 10-16-2008 |
20080299344 | Polyester blends exhibiting low temperature toughness - Polymer blends suitable for packaging are disclosed that include one or more impact modifiers; and one or more polyethylene terephthalate homopolymers or copolymers obtained by a melt phase polymerization using a catalyst system comprising aluminum atoms in an amount, for example, from about 3 ppm to about 60 ppm and one or more alkaline earth metal atoms, alkali metal atoms, or alkali compound residues in an amount, for example, from about 1 ppm to about 25 ppm, in each case based on the weight of the one or more polyethylene terephthalate homopolymers or copolymers The polymer blends disclosed exhibit improved low temperature toughness compared with blends made using polymers prepared with conventional catalyst systems. | 12-04-2008 |
20090131627 | POLYESTER POLYMER PARTICLES HAVING A SMALL SURFACE TO CENTER MOLECULAR WEIGHT GRADIENT - There is now provided a polyester polymer particle having an It.V., a surface, and a center, wherein the It.V. at the surface of the particle is less than 0.25 dL/g higher than the It.V. at the center of the particle. The polyester polymer particle is desirably crystalline to prevent the particles from sticking to each other while drying, and desirably contains less than 10 ppm acetaldehyde. A polyester container, preferably a preform or beverage bottle, is made by feeding crystallized polyester particles having an It.V. of at least 0.70 dL/g to an extrusion zone, melting the particles in the extrusion zone to form a molten polyester polymer composition, and forming a sheet or a molded part from extruded molten polyester polymer, wherein at least a portion of the polyester particles have an It.V. at their surface which does not vary from their It.V. at their center by more than 0.25 dL/g, and the particles have not been solid state polymerized. Such polyester compositions have an It.V. suitable for containers, yet lose less It.V. during melt processing than existing polyesters. | 05-21-2009 |
20090315219 | SCREW DESIGNS HAVING IMPROVED PERFORMANCE WITH LOW MELTING PET RESINS - Disclosed is a process for a melt processing a polyethylene terephthalate resin characterized by one or more of the following. The polyester particles may have at least two melting peaks wherein one of the at least two melting peaks is a low peak melting point with a range from 140° C. to 220° C., or from 140° C. to 230° C., and having a melting endothermic area of at least the absolute value of 1 J/g. The polyester particles may have one or more melting peaks at least one of which when measured on a DSC first heating scan has a heating curve departing from a baseline in the endothermic direction at a temperature of less than or equal to 200° C. The polyester particles may have an It.V. at their surface which is less than 0.25 dL/g higher than the It.V. at their center. The polyester particles may have not been solid stated. The melt processing device comprises a screw with a total length, L, a feed zone length in the range from 0.16L and 0.45L, a taper angle, φ, in the range from 0.5 degrees and 5.0 degrees and a compression ratio, CR, in the range from 2.0 and 5.0. | 12-24-2009 |
20110031210 | PET Polymer with Improved Properties - Polyester compositions having desirable injection molding properties and that retain good crystallization rates and natural stretch ratio characteristics are described. These polyesters are suitable for the manufacture of beverage containers, bulk continuous filaments, and other articles that can benefit from such improved properties. | 02-10-2011 |
20110034630 | Late Addition to Effect Compositional Modifications in Condensation Polymers - A process for preparing modified polymer by withdrawing a slip stream of polymer melt from the discharge line of a continuous polymerization reactor, admixing in a highly modified polymeric additive into the polymer melt within the slip stream, then introducing the modifier containing slip stream late in the manufacturing process prior to the slip stream withdrawal point. The improved processes of the invention have particular utility for large-scale, continuous reactor where transitions and short production runs are economically prohibitive thereby limiting the product breath. The process is particularly suited for producing a family of copolyesters using a continuous melt phase production process. | 02-10-2011 |
20110034665 | Polyester Polymer Particles Having a Small Surface to Center Molecular Weight Gradient - There is now provided a polyester polymer particle having an It.V., a surface, and a center, wherein the It.V. at the surface of the particle is less than 0.25 dL/g higher than the It.V. at the center of the particle. The polyester polymer particle is desirably crystalline to prevent the particles from sticking to each other while drying, and desirably contains less than 10 ppm acetaldehyde. A polyester container, preferably a preform or beverage bottle, is made by feeding crystallized polyester particles having an It.V. of at least 0.70 dL/g to an extrusion zone, melting the particles in the extrusion zone to form a molten polyester polymer composition, and forming a sheet or a molded part from extruded molten polyester polymer, wherein at least a portion of the polyester particles have an It.V. at their surface which does not vary from their It.V. at their center by more than 0.25 dL/g, and the particles have not been solid state polymerized. Such polyester compositions have an It.V. suitable for containers, yet lose less It.V. during melt processing than existing polyesters. | 02-10-2011 |
20110040067 | Low Melting Polyester Polymers - A bulk of polyester polymer particles comprising polyester polymer comprising greater than 75% virgin polyester polymer, the particles having:
| 02-17-2011 |
20110092663 | SPHEROIDAL POLYESTER POLYMER ARTICLES - In one embodiment of the present invention, spheroidal polyester polymer particles, as well as articles such as films, sheets, tubes, and the like made from the spheroidal particles, are provided. According to various embodiments of the invention, the particles may have an intrinsic viscosity (It.V.) of at least 0.65 dL/g and a degree of crystallinity less than about 45 percent. In another embodiment, the polyester polymer can comprise at least 4 mole percent and no more than 20 mole percent of residues other than ethylene glycol residues. | 04-21-2011 |
20110318519 | POLYESTER BLENDS EXHIBITING LOW TEMPERATURE TOUGHNESS - Polymer blends suitable for packaging are disclosed that include one or more impact modifiers; and one or more polyethylene terephthalate homopolymers or copolymers obtained by a melt phase polymerization using a catalyst system comprising aluminum atoms in an amount, for example, from about 3 ppm to about 60 ppm and one or more alkaline earth metal atoms, alkali metal atoms, or alkali compound residues in an amount, for example, from about 1 ppm to about 25 ppm, in each case based on the weight of the one or more polyethylene terephthalate homopolymers or copolymers The polymer blends disclosed exhibit improved low temperature toughness compared with blends made using polymers prepared with conventional catalyst systems. | 12-29-2011 |