Abstract: A container comprising a polyester composition with enhanced mechanical properties is provided. The polyester composition comprises a polyester and a creep control agent. In particular embodiments, the polyester composition comprises a polyester, a creep control agent, and a gas barrier additive. In particular embodiments, the creep control agents are molecules or polymers comprising dianhydrides, bis-lactams, bis-oxazoles, and epoxides.

Abstract: Multilayer oxygen absorbing structure comprising at least two reactive oxygen scavenging layers arranged in sequence: a rapidly absorbing highly reactive oxygen-scavenging system, comprising an oxygen permeable matrix polymer and an oxygen scavenger, and a long life layer comprising high passive oxygen barrier matrix polymer, and an oxygen scavenger.

Abstract: A transparent article includes a continuous polyester matrix having at least one incompatible filler dispersed therein. The incompatible filler provides domains in the polyester matrix, each domain having a particular dimension, thus providing a range of dimensions for the domains in the article. To create haze, the dimensions are within the range of from about 380 nm to about 720 nm. Once the range of dimensions is determined, a light absorbent composition can be found which absorbs light at a range of wavelengths that at least substantially covers the range of dimensions of the domains. In doing so, it has been found that the haze of the article can be substantially masked. Method for producing the article and for masking the haze are also provided.

Abstract: Compliant coatings for insertable medical articles are provided. In some aspects, the coating includes a diene polymer-containing layer, and a second coated layer that includes another polymer. The coating can be formed by coupling the polymer of the second coated layer to the first coated layer via latent reactive groups, such as photoreactive groups. In other aspects, the insertable medical article has a coating that provides different functional features to different surfaces of the article. The medical article can have a cylindrical shape with an interior surface having a first coating, and an exterior surface with a second coating, wherein the article also includes a plurality of openings.

Abstract: A multi-layer film with barrier properties having one or more layers made from a bio-based film is disclosed. In one aspect, a multi-layer packaging film including (a) an outer layer including a bio-based film, wherein the bio-based film is polylactide, (b) an adhesive layer adjacent to the outer layer and (c) a product side layer including a metalized polyolefin having barrier properties, wherein the multi-layer packaging film is a flexible film.

Abstract: A laminated resin tube is formed mainly of inexpensive materials and has improved low-permeable ability. The laminated resin tube has a plurality of laminated component resin tubes made of thermoplastic resins. At least one of the plurality of component resin tubes is a first low-permeable barrier tube made of polyamide 9T, and the rest of the component resin tubes include a resin tube made of polyamide 6 or polyamide 66.

Abstract: Oxygen-scavenging polymers and packaging for holding oxygen-sensitive products. A heat treatment process has been found to significantly increase the oxygen-scavenging performance of the polymer. The enhanced scavenging polymer can be effectively incorporated into various packaging, including transparent multilayer containers for beer and juice. In one embodiment, a multilayer package made from the scavenger provides an actual reduction in oxygen content of a contents of the package, over a long period of time (e.g., 24 weeks). The package can be stored unfilled for an extended period (without significant loss of scavenging capability) and will scavenge substantially immediately upon filling with a liquid product. The package may incorporate a relatively low weight percentage of the scavenger, thus providing enhanced scavenging in a cost-effective manner.

Abstract: A gas-barrier laminate comprises a plastic substrate (A), an inorganic thin film (B) formed on at least one surface of the plastic substrate (A), and a polyester-based resin layer (C) formed by applying a coating material containing a polyester-based resin on a surface of the inorganic thin film (B), wherein the polyester-based resin has a glass transition temperature of 50 to 70° C., a molecular weight of 1500 to 15000 and a hydroxyl value of 10 to 60 mg KOH/g, and the gas-barrier laminate has an oxygen permeability of not more than 5 cc/m2/day/atm and a water vapor permeability of not more than 5 g/m2/day.

Abstract: The present invention relates to polymer structures such as thermoplastic films having improved aroma barrier properties and methods for making the polymeric structures, which may be in the form of a resealable container. Aroma barrier is improved by incorporating a barrier layer of polymeric material including at least about 10 mole percent of polymerized cyclo-olefin moieties.

Abstract: The invention describes a flexible tubular article for transport of volatile hydrocarbons comprising: (a) an inner layer of a polyvinylidene difluoride (PVDF) polymer or a polyvinylidene difluoride copolymer; (b) an intermediate thermoplastic polyurethane (TPU) layer extruded in tubular form over the inner PVDF layer, and (c) a polyvinyl chloride polymer extruded in tubular form over the outside surface of the intermediate layer and being coextensive therewith. The tubular articles of the invention have a maximum permeation rating of 15 g/m2/day under SAE J1737 test conditions.

Abstract: A multilayer elastomer laminate that is impermeable to inflation gases, which is capable of adhering to a diene elastomer composition and which can be used in an inflatable article provided with such a diene composition, said laminate comprising at least two superposed elastomer layers (phr signifying parts by weight per hundred parts of elastomer, in each elastomer composition considered): as a gastight first layer, a first elastomer composition comprising more than 50 phr of a copolymer containing polystirene and polyisobutylene blocks; as an adhesive second layer, a second elastomer composition comprising more than 50 phr of an unsaturated thermoplastic stirene copolymer and optionally a liquid plasticizing agent at a content from 0 to less than 100 phr. This multilayer laminate possesses very good impermeability properties and a reduced hysteresis compared to layers based on butyl rubber, and also a high adhesion to a diene elastomer third layer.

Abstract: Methods of improving the shelf life of beverages may involve applying a coating mix to a label thereby forming a coated label, curing the coated label, applying the coated label to a container, and adding a beverage to the container, wherein the coated label increases a gas barrier property of the container. Beverage containers such as PET containers may be tailored for specific beverages using certain coated labels.

Abstract: The invention provides coated substrates comprising a substrate; and a coating on at least one surface of the substrate comprising vermiculite, polymer capable of forming a film, dispersion agent for the vermiculite in the polymer, said dispersion agent bearing a negative charge, and cross-linking agent. The invention also provides articles coated with such coatings and methods for making the coated substrates and articles.

Abstract: The presently disclosed subject matter is directed to a barrier film that maintains an oxygen barrier after being subjected to autoclaving conditions. The film comprises one EVOH layer positioned as a core layer, and one EVOH layer positioned directly adjacent to an outer layer comprising highly permeable material having a moisture vapor permeability greater than about 40 g-mil/100 in2-day-atm. During autoclaving, the barrier properties of the EVOH layer positioned adjacent to the outer layer allows improved recovery of oxygen barrier properties. In addition, during rewetting applications, the internal EVOH layer maintains the oxygen barrier. Also disclosed are methods of making and using the disclosed barrier film.

Abstract: A hollow molded article including a polyolefin resin-based layer (A), a modified polyolefin resin-based layer (B) and a fluororesin-based layer (C), wherein the fluororesin-based layer (C) constitutes at least one of the innermost and outermost layers of the hollow molded article.

Abstract: The invention relates to a composite material (1), to containers made therefrom and to a method for producing the composite material (1), which comprises a substrate (2) and a coating (3) on the substrate (2), wherein the coating (3) provides at least a first region (31) facing the substrate (2) and at least a second region (32) facing away the substrate (2), and wherein the first region (31) comprises a barrier layer (4) and the second region (32) a passivation layer (5).

Abstract: A transparent article includes a continuous polyester matrix having at least one incompatible filler dispersed therein. The incompatible filler provides domains in the polyester matrix, each domain having a particular dimension, thus providing a range of dimensions for the domains in the article. To create haze, the dimensions are within the range of from about 380 nm to about 720 nm. Once the range of dimensions is determined, a light absorbent composition can be found which absorbs light at a range of wavelengths that at least substantially covers the range of dimensions of the domains. In doing so, it has been found that the haze of the article can be substantially masked. Method for producing the article and for masking the haze are also provided.

Abstract: The invention relates to a novel composition comprising at least one polyphthalamide reactively extruded with at least one other polyamide, a polyester, and a modifier. The composition can be further modified with fillers to add increased strength. Other additives such as colorants, flame retardants, and UV degradation inhibitors are also contemplated. This composition exhibits superior barrier to organic vapors, impact strength and heat distortion temperatures. Also disclosed are articles using this novel composition such as fuel tanks for gasoline engines used to power lawn mowers and garden machinery.

Abstract: A cable jacket includes an extruded polymer made from PVDF, PVC and a compatibilizing agent, where a ratio of PVDF, PVC and a compatibilizing agent is substantially 7:3:1.

Abstract: A flexible hose for transporting food liquids, particularly for irrigation or the like, comprising at least one outer protective layer (2) of a first flexible polymer material and at least one inner layer (3) in direct contact with the fluid to be transported, made of a second flexible polyvinyl chloride (PVC)-containing polymer material. The second polymer material includes a plasticizer agent having as low a migration level as to maintain the flexibility of said second polymer material substantially unaltered with time. The plasticizer agent is selected from the group comprising non-phthalate additives, so that it can be non-toxic and non-polluting for the food products to be transported.

Abstract: A transparent article includes a continuous polyester matrix having at least one incompatible filler dispersed therein. The incompatible filler provides domains in the polyester matrix, each domain having a particular dimension, thus providing a range of dimensions for the domains in the article. To create haze, the dimensions are within the range of from about 380 nm to about 720 nm. Once the range of dimensions is determined, a light absorbent composition can be found which absorbs light at a range of wavelengths that at least substantially covers the range of dimensions of the domains. In doing so, it has been found that the haze of the article can be substantially masked. Method for producing the article and for masking the haze are also provided.

Abstract: A transparent article includes a continuous polyester matrix having at least one incompatible filler dispersed therein. The incompatible filler provides domains in the polyester matrix, each domain having a particular dimension, thus providing a range of dimensions for the domains in the article. To create haze, the dimensions are within the range of from about 380 nm to about 720 nm. Once the range of dimensions is determined, a light absorbent composition can be found which absorbs light at a range of wavelengths that at least substantially covers the range of dimensions of the domains. In doing so, it has been found that the haze of the article can be substantially masked. Method for producing the article and for masking the haze are also provided.

Abstract: A transparent article includes a continuous polyester matrix having at least one incompatible filler dispersed therein. The incompatible filler provides domains in the polyester matrix, each domain having a particular dimension, thus providing a range of dimensions for the domains in the article. To create haze, the dimensions are within the range of from about 380 nm to about 720 nm. Once the range of dimensions is determined, a light absorbent composition can be found which absorbs light at a range of wavelengths that at least substantially covers the range of dimensions of the domains. In doing so, it has been found that the haze of the article can be substantially masked. Method for producing the article and for masking the haze are also provided.

Abstract: To provide an oxygen-absorbing barrier resin composition which has excellent oxygen-barrier properties even under high-humidity conditions and can give a multilayer structure having excellent peel strength; an oxygen-absorbing barrier film comprising the oxygen-absorbing barrier resin composition; a multilayer structure including a layer comprising the oxygen-absorbing barrier film; and a packing container comprising the multilayer structure. The oxygen-absorbing barrier resin composition comprises a resin (A) having an oxygen permeability of at most 100 cc/m2-day-atm and a resin (B) having an oxygen absorption rate of at least 0.001 cc/cm2·day, wherein the resin (B) is dispersed in the matrix of the resin (A) and the resin (B) is in the form of rods in which the average of the maximum diameters of cross sections perpendicular to the lengthwise direction is at most 1.0 ?m.

Abstract: A layered composite which includes the following layers (I) and (II), wherein layer (I) includes (a) from 0 to 80 part by weight of at least one particular polyamide; (b) from 0 to 100 parts by weight of at least one polyamine-polyamide copolymer; and (c) from 0 to 80 parts by weight of at least one particular polyamide which is different from (a), wherein various monomer units are present in at least 20 parts by weight of the entirety of (a) and (b) and various other monomer units are present in at least 20 parts by weight of the entirety of (b) and (c); and layer (II) includes at least one ethylene-vinyl alcohol copolymer.

Abstract: Multiple layer structures comprising one or more poly(vinylidene chloride) layers and containers made from the multiple layer structures are provided. In a general embodiment, the present disclosure provides a multiple layer structure comprising one or more PVDC layers comprising a component selected from the group consisting of a poly(vinylidene chloride), a poly(vinylidene chloride) copolymer, and combinations thereof. The multiple layer structure further comprises one or more tie layers attached to the PVDC layer. The tie layer comprises a component selected from the group consisting of (a) polyether polyester copolymers, (b) polyurethanes having a melting temperature above about 121° C., (c) a blend comprising a polyamide and an ethylene copolymer containing an amine reactive functional group, and combinations thereof.

Abstract: The present invention relates to a preformed liner of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer adhered to the surface of a pipe, and in particular, an oil well pipe, without the need for either a primer layer or an adhesive. The liner comprises an effective amount of metal powder which provides adhesion between the liner and the surface of the pipe. The present invention also relates to a process for making such pipe, where in a preferred embodiment, the liner is co-extruded to form an inner layer and an outer layer. This co-extrusion embodiment is particularly useful in applications where high purity is necessary. In this case, the inner layer comprises an effective amount of metal powder and the outer layer is pure tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.

Abstract: A heat-shrinkable film suitable for forming an easy opening cook-in bag is provided. The film comprises at least five layers, including an inner layer, an inner frangible layer, a barrier layer, an outer frangible layer, and an outer layer. The film is capable of being formed into a bag comprising a lap seal, a top end seal, and a bottom end seal, wherein the seals are heat sealed to a closed condition to contain and protect a product disposed therein. The lap seal, top end seal, and bottom end seal each are able to remain sealed during cook-in conditions. Additionally, the lap seal, top end seal, and bottom end seal each are peelable and easily openable by application of force.

Abstract: A process for producing a nanocomposite of a halogenated elastomer and an inorganic, exfoliated clay includes the in-situ protonation of a modifier, which may be an alkylamine, arylamine or an alkylarylamine. This process can be integrated with a polymer halogenation process. The nanocomposite so formed has improved air barrier properties and is suitable for use as a tire innerliner or innertube.

Abstract: The invention provides for an extended shelf life package comprising a material for human ingestion that degrades by oxidation, comprising an oxygen scavenger comprising a transition metal oxygen scavenger, a container substantially impervious to oxygen, wherein the container has a filter suspended in the container, the filter holds the material for human ingestion, and the container also holds the oxygen scavenger. In another embodiment, the invention provides for an extended shelf life package comprising human ingestible material that degrades by giving off CO2 comprising a carbon dioxide scavenger, a container substantially impervious to carbon dioxide, wherein the container has a filter suspended in the container, the filter holds the human ingestible material, and the container also holds the carbon dioxide scavenger.

Abstract: The invention relates to the papermaking art and, in particular, to the manufacture of paper substrates, paper-containing articles such as multilayered paper or paperboard packaging, containing a fluorine-containing compound and having enhanced glueability and/or grease resistance.

Abstract: The present invention relates to hollow bodies with improved barrier action, where the hollow bodies are composed of a three-layer sandwich structure with a shell made of polystyrene and with a middle layer as vapor barrier.

Abstract: The invention provides a label for in-mold forming which tenaciously adheres to molded articles regardless of the materials of the molded articles, is usable under a wide range of molded-article molding conditions, and has an excellent print finish. The invention relates to: a label for in-mold forming, which comprises a resin film comprising a heat-sealable layer and a printing layer, wherein the heat-sealable layer has a rate of surface aperture of 6-30%, the printing layer has a dot skipping of 5% or lower, and the printing layer has a Bekk's surface smoothness (JIS-P-8119) of 650-20,000 seconds; and a molded article using the label.

Abstract: Bags or liners having incorporated therein an effective amount of odor management agents including a counteractant agent, a neutralizing agent and optionally, a masking agent, whereby the odor management agent imparts no perceptible scent to the bags or liners, such that the bags or liners are substantially free of fragrance while the odor management agent reduces malodor emanating from products disposed within the bag. Further, the invention is drawn to web materials for use in forming the bags or liners having odor management agents. The odor management agent is disposed within the bag or dispersed substantially uniformly throughout the web.

Abstract: An improved fluoroplastic lined elastomeric tube that can maintain a stable flow rate while pumping aggressive chemicals in a peristaltic pump for an extended period of time and is fabricated in sizes ranging from 0.5 mm to 100 mm in inside diameter. The inner fluoroplastic liner comprises a composite of expanded polytetrafluoroethylene and a fluoroplastic polymer resulting in improved flex life over single component fluoroplastics. The inventive liner is bonded to either an unreinforced elastomer or a fiber reinforced elastomer for use in both low and high pressure peristaltic pump applications.

Abstract: A multilayer blow molded container having a layer structure that a polyglycolic acid layer is provided as a core layer, and thermoplastic polyester resin layers are arranged as inner and outer layers, wherein the core layer formed of the polyglycolic acid layer is not present between the inner and outer layers in at least part of an opening end portion of the container, and the core layer formed of the polyglycolic acid layer is not present between the inner and outer layers in at least part of a bottom of the container, wherein the melt viscosity x of a polyglycolic acid forming the polyglycolic acid layer is 300 to 900 Pa·s as measured at a temperature of 270° C. and a shear rate of 122 sec?1, the melt viscosity y of a thermoplastic polyester resin forming the thermoplastic polyester resin layers is 250 to 600 Pa·s as measured at a temperature of 290° C. and a shear rate of 122 sec?1, and a melt viscosity ratio x/y between both melt viscosities is 0.85 to 1.80, and a production process thereof.

Abstract: Films comprising a liquid-absorbant layer and an impermeable layer are provided. Processes for manufacturing these films is also provided. The films are suitable for preparation of tubular casings and shrinkbags, in particular, casings for smoked foodstuffs. Also described are foodstuffs processed in the tubular casings.

Abstract: A can that features superior resistance against puncture under higher puncture strength, and superior resistance against flange cracking. The resin-coated aluminum seamless can body of the present invention features superior resistance against cracks in the can wall during distribution, and resistance against flange cracking, wherein the inner and/or outer surface of the can of the aluminum seamless can 10 is coated with a layer of thermo-plastic resin, the thickness of the thermoplastic resin layers of the inner surface and the outer surface is a total of 2-50 ?m, with a minimum thickness of the aluminum plate of the side wall of the can 0.

Abstract: Disclosed are polymer compositions having high transparency and low haze comprising immiscible blends of one or more thermoplastic polymers selected from polyesters, polycarbonates, and polyarylates, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend which have refractive indices which differ by about 0.006 to about ?0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. The blends of the present invention are useful in producing shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce oxygen-scavenging compositions.

Abstract: Films comprising a liquid-absorbant layer and an impermeable layer are provided. Processes for manufacturing these films is also provided. The films are suitable for preparation of tubular casings and shrinkbags, in particular, casings for smoked foodstuffs. Also described are foodstuffs processed in the tubular casings.

Abstract: Disclosed are oxygen-scavenging polymer compositions having high transparency and low haze comprising immiscible blends of one or more thermoplastic polymers selected from polyesters, polycarbonates, and polyarylates, a copolyamide or a transamidized, homogeneous blend of a least two polyamides, and a metal catalyst. The components of the immiscible blend which have refractive indices which differ by about 0.006 to about ?0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. The blends of the present invention are useful in producing shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties.

Abstract: Disclosed is a process for the preparation of shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles, having high transparency and low haze, and comprising immiscible blends of at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend have refractive indices which differ by about 0.006 to about ?0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce shaped articles having oxygen-scavenging properties.

Abstract: Disclosed are oxygen-scavenging polymer compositions having high transparency and low haze comprising immiscible blends of at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol, a copolyamide or a transamidized, homogeneous blend of a least two polyamides, and a metal catalyst. The components of the immiscible blend which have refractive indices which differ by about 0.006 to about ?0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. The blends of the present invention are useful in producing shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties.

Abstract: A deep drawing heat shrinkable multilayer film includes: an intermediate layer made of a vinylidene chloride copolymer resin (a); and a resin layer made of a first thermoplastic resin (b) layered on at least one surface of the intermediate layer. The multilayer film has hot water shrinkabilities in longitudinal and transverse directions at a temperature of 90° C. range from 3% to 35% respectively.

Abstract: A domed lid 12 for a food container 10 is configured for ease of engagement and removal from a container base 14. The lid characteristically includes: (a) a dome portion 16 with a top wall 24 and a sidewall 26; (b) a flange portion 28 extending outwardly away from a lower portion of the sidewall; and (c) a tab portion 30 extending outwardly from the flange. The flange portion is provided with a rim 32 having a variable profile around the rim characterized in that: (i) the rim is provided with a securing undercut portion 36 extending around the majority of its periphery adapted to secure the lid to an outer border of base 14; and (ii) the rim has a pair of relatively passive engagement profile portions 42, 44 on either side of tab 30, extending to the securing undercut portion of the rim, the passive engagement profile portions are configured so that they are undercut less than the securing undercut portion of the lid, thereby facilitating engagement of the lid with, or removal of the lid from, base 14.

Abstract: Disclosed is a process for the preparation of shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles, having high transparency and low haze comprising immiscible blends of one or more thermoplastic polymers selected from polyesters, polycarbonates, and polyarylates, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend which have refractive indices which differ by about 0.006 to about ?0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce shaped articles having oxygen-scavenging properties.

Abstract: A weld joint has a weld portion for being welded and bonded to a rim portion around an opening of a resin fuel tank. The weld portion is made of a resin alloy material that is obtained by alloying EVOH or PA with a modified HDPE. A highly-weldable layer is provided in an extremity portion of the weld portion throughout an entire circumference of the weld portion. The highly-weldable layer is made of HDPE and/or a modified HDPE having good weldability to the resin fuel tank. An extremity end surface of the highly-weldable layer serves as a weld surface for welding the weld portion to the resin fuel tank.

Abstract: Disclosed are polymer compositions having high transparency and low haze comprising immiscible blends of at least one polyester comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend have refractive indices which differ by about 0.006 to about ?0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. The blends of the present invention are useful in producing shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce oxygen-scavenging compositions.

Abstract: An inflatable automotive protective cushion and method of formation. The protective cushion includes a multilayer film coating with an adhesive layer and an overlying barrier layer. The adhesive layer is adapted to bond to a textile substrate and the barrier layer is adapted to block air permeability.

Abstract: Compositions comprising a polyester resin and a polyamide derived from a dicarboxylic acid with 6-22 carbon atoms and from m-xylylene diamine having high-level gas barrier properties, obtained by mixing in the melted state the polyester resin premixed with a dianhydride of a tetracarboxylic acid and the polyamide, operating under conditions such as to render the polymeric components theologically rheologically compatible with each other. The compositions are suitable for preparing containers and biaxially-orientated films.