Abstract: A polyester-based composition is disclosed containing a polyether additive with high gas barrier properties, and articles of packaging comprising the same, particularly with high oxygen and carbon dioxide barrier properties, for advantageous use in the preservation of food products and complete recycling at the end of their life cycle.

Abstract: Container made from a thermoplastic molding composition comprising A) from 59.8 to 99.8% by weight of a polyester composed of from 30 to 100% by weight of a polybutylene terephthalate and 0 to 70% by weight of a polyester derived from 1,4-butanediol and a C2-12-aliphatic dicarboxylic acid and/or C6-12-cycloaliphatic dicarboxylic acid, B) 0.1 to 10% by weight of an oxidizable polyester-ether, C) 5 to 10000 weight-ppm of a salt of a transition metal, D) 0 to 40% by weight of other additional substances, where the total of the percentages by weight of components A) to B) is 100% by weight.

Abstract: A multilayer film is described made of recyclable thermoplastic material comprising a layer (A) of unoriented amorphous PET combined with at least one barrier layer (B) which comprises unoriented amorphous PET, a salt of a transition metal and an oxidizable polyester-ether, in which the quantity of unoriented amorphous PET is at least 95% in weight of the total film and in which the permeability to oxygen is below 10 cc/m2/24 h/atm. The film is particularly suitable for the production of food-grade containers and packages with high barrier effect and high transparency which, at the same time, are fully recyclable in the same application.

Abstract: A multilayer film is described made of recyclable thermoplastic material comprising a layer (A) of unoriented amorphous PET combined with at least one barrier layer (B) which comprises unoriented amorphous PET, a salt of a transition metal and an oxidisable polyester-ether, in which the quantity of unoriented amorphous PET is at least 95% in weight of the total film and in which the permeability to oxygen is below 10 cc/m2/24 h/atm. The film is particularly suitable for the production of food-grade containers and packages with high barrier effect and high transparency which, at the same time, are fully recyclable in the same application.

Abstract: Mono- or biaxially-stretched polyester resin foamed sheets and films wherein the polyester resin has a melt strength of more than 1 centinewton at 280° C., a melt viscosity of at least 1500 Pa.s at 280° C. for a shear ratio which tends to zero and a crystallization rate such that for a 10-minute heating at 120° C. the crystallinity can reach values as high as 30-35%.

Abstract: A blown foamed film of polyester resin, obtained by blow-molding a foamed tubular sheet at the outlet of a foaming extruder.

Abstract: Polyester resin foamed sheet, mono e biaxially stretched usable for the production of containers for beverages and foods, having a density lower than 700 kg/m3 and a crystallization rate such that, when the sheet is heated at 120° C. for 5 minutes, the crystallinity does not exceeds 15%. The aromatic polyester resin used for preparing the foamed sheet can be mixed with an aliphatic polyester resin to impart biodegradability and/or compostability to the sheet or with 1-10% by weight of a polyamide.

Abstract: Flame retardant compositions comprising a polyester resin having a melt strength higher than 8 centinewton an intrinsic viscosity greater than 0.8 dl/g, suitable for the preparation of foamed cellular material and a flame retardant compound capable of not reducing below 3 Nm the torque intake of the resin in a heating test at 280° C. under nitrogen for 10 minutes in the presence of 10% by weight of the flame retardant compound.

Abstract: Articles from a polyester resin obtained by melt-shaping of the resin added with a polyfunctional compound, capable of increasing the molecular weight of the resin by addition reaction in the solid state with the end groups of the resin and by upgrading treatment of the article, so as to increase by at least 0.1 dl/g the intrinsic viscosity of the starting resin.

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 compatible each other. The compositions are suitable for preparing containers and biaxially-orientated films.

Abstract: Foamed beads of polyester resin having rheological and crystallizability characteristics suitable for the preparation of foamed articles by sintering beads in a mold heated with superheated steam or with inert gas or air.

Abstract: A blown foamed film of polyester resin, obtained by blow-molding a foamed tubular sheet at the outlet of a foaming extruder.

Abstract: Transparent, articles, in particular sheets, having a thickness greater than 5 mm obtained from polyalkylene terephthalate/isophthalate resin containing 5-20% of isophthalic, acid units,. characterised by an intrinsic viscosity greater than 0.8 dl/g; a melt strength at 280° C. greater than 1 cN and a melt viscosity at 280° C. greater than 2000 Pa·s for shear rates tending to zero and not less than 200 Pa·s for shear rates of 1000 sec−1.

Abstract: A foamed cellular material which can be obtained from foamed aromatic polyester resins with a bulk density of 50 to 700 kg/m3 by heating in vacuum to temperatures which are higher than the Tg of the material and lower than its melting point. The foamed material, generally in the form of a sheet or panel, has high-level characteristics in terms of flexibility and dimensional thermostability depending on the degree of crystallinity after the vacuum treatment.

Abstract: Polyester resins containing up to 5% by weight of a polymeric liquid crystal and an upgrading agent capable of increasing the I.V. of the resin by polyaddition reaction in the solid state with the end groups of the resin. Fibers, films and biaxially oriented articles obtained from the resins.

Abstract: Articles from a polyester resin reinforced with glass fiber obtained by melt-shaping of the resin mixed with the glass fiber and a polyfunctional compound capable of increasing the intrinsic viscosity of the resin by addition reactions with the end groups of the rein using melt residence times during the shaping phase lower than 120 sec. and temperatures lower than 300.degree. C.

Abstract: Filaments from a polyester resin having an elastic modulus higher than 30 GPa and stress at break greater than 300 MPa. The filaments are obtained by upgrading under stretch filaments prepared from polyester resin mixed in the melt with a polyfunctional compound able to increase the polymer intrinsic viscosity by addition reaction in the solid state with the terminal groups of the resin.

Abstract: Polyester resins containing up to 5% by weight of a polymeric liquid crystal and an upgrading agent capable of increasing the I. V. of the resin by polyaddition reaction in the solid state with the end groups of the resin. Fibres, films and biaxially oriented articles obtained from the resins.

Abstract: A foamed cellular material from polyester resins is obtained by extrusion foaming of polyester resins having melt strength higher than 8 centinewton, intrinsic viscosity greater than 0.8 dl/g and complex melt viscosity higher than 25,000 poises.

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.