Abstract: Polyester films which comprise, alongside thermoplastic polyester, e.g. polyethylene terephthalate, from 5-45% by weight of poly(m-xyleneadipamide) and optionally from 0.02 to 1% by weight of fillers. The inventive films, which are produced by a sequential stretching process, feature improved mechanical properties, such as a modulus of elasticity greater than 3500 N/mm2 in both orientation directions, high gloss, low haze, and very good barrier properties with respect to oxygen transmission. The inventive films are therefore suitable as packaging material for foods and for other consumable items.

Abstract: Three-layer, highly oriented polyester films having an A-B-C layer construction, preferably made of polyethylene terephthalate, which, in addition to a base layer B have a smooth surface layer A which contains no external particles and a rough surface layer C which contains external particles such as antiblocking agents or pigments, preferably SiO2, in defined amounts and particle sizes, and the surface layer A is additionally provided with an acrylate-containing layer D feature in particular good producibility and processibility, high gloss of the film surface A and low opacity. The very smooth surface A or D is suitable in particular for coating with materials, for example SiOx, by means of plasma polymerization of hexamethyldisiloxane by the CVD or PECVD method, which provides the film with a high oxygen barrier and is suitable in particular as packaging for light- and air-sensitive foods or other consumable items.

Abstract: Three-layer, highly oriented polyester films having an A-B-C layer construction, preferably made of polyethylene terephthalate, which, in addition to a base layer B have a smooth surface layer A which contains no external particles and a rough surface layer C which contains external particles such as antiblocking agents or pigments, preferably SiO2, in defined amounts and particle sizes, and the surface layer C is additionally provided with an acrylate-containing layer D feature in particular good producibility and processibility, high gloss of the film surface A and low opacity. The very smooth surface A is suitable in particular for coating with materials, for example SiOx, by means of plasma polymerization of hexamethyldisiloxane by the CVD or PECVD method, which provides the film with a high oxygen barrier and is suitable in particular as packaging for light- and air-sensitive foods or other consumable items.

Abstract: The invention relates to a single- or multilayer, white, biaxially oriented polyester film. Films of the invention are formed from thermoplastic polyester and are coated on at least one side with a water-soluble adhesion-promoting layer that includes a hydrolyzed amino-functional silane. The invention further relates to the use of the film and to a process for its production.

Abstract: The application discloses a transparent, biaxially oriented polyester film having a base layer at least 80% by weight of which is composed of a thermoplastic polyester, and having at least one outer layer, wherein the outer layer is composed of a polymer, or of a mixture of polymers, which comprises at least 40% by weight of ethylene 2,6-naphthalate units and up to 40% by weight of ethylene terephthalate units and/or units from cycloaliphatic or aromatic diols and/or dicarboxylic acids, with the proviso that the Tg2 value of the polyester film is above the Tg2 value of the base layer but below the Tg2 value of the outer layer, and at least one film surface has a surface tension of from 35 to 65 mN/m and/or has been provided with a functional coating of thickness from 5 to 100 nm. The film has low atmospheric oxygen transmission. It is particularly suitable for packaging uses, specifically for packaging foods and other consumable items, and for laminating, metallizing and printing.

Abstract: The present application relates to a white, biaxially oriented, flame-retardant, UV-resistant polyester film with at least one base layer which comprises, based on the weight of the base layer, from 2 to 60% by weight of a cycloolefin copolymer (COC), where the glass transition temperature of the COC is within the range from 70 to 270° C. The film also comprises from 0.01 to 5.0% by weight of a UV stabilizer as light stabilizer and also comprises from 0.5 to 30% by weight of flame retardant, based in each case on the weight of the layer comprising the UV stabilizer and/or comprising the flame retardant. The film of the invention is suitable for packing foods or other consumable items which are sensitive to light and/or to air, or for use in industry, e.g. in the production of hot-stamping foils or as a label film, or for image-recording papers, printed sheets or magnetic recording cards.

Abstract: A process for producing a biaxially oriented polyester film which has a base layer (B) and has a heatsealable outer layer (A) that can be peeled from polyester, where the outer layer (A) includes from 60 to 99% by weight of polyester which is composed of from 12 to 89 mol % of units derived from an aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid, where the total of the molar percentages is 100, encompassing the steps of a) extruding of at least the base layer (B) to give an unoriented film; b) stretching this film in a first direction; c) stretching this film in a second direction perpendicular to the first d) heat-setting the stretched film, and e) producing the outer layer (A) on the base layer (B) by using lamination to apply the outer layer film (A) produced in a separate process, where the lamination step e) takes place prior to step b) or between steps b) and c).

Abstract: The invention relates to biaxially orientated, co-extruded polyester films, which have at least one base layer that contains a thermoplastic polyester, preferably polyethylene terephthalate and approx. 2 to 60 wt.-% of a cycloolefin copolymer that is preferably composed of norbornene and ethylene units and which have at least one cover layer that is devoid of a COC and which optionally have additional cover or intermediate layers and can contain conventional additives such as stabilisers and anti-blocking agents. Said films are characterized in particular by a degree of whiteness>70%, an opacity>55% and a gloss, (at least on one side)>100 and are therefore suitable for numerous industrial applications. During the production of the films in accordance with the co-extrusion process, up to 70 wt.-% of reclaimed product can be used, without having a noticeable negative effect on the physical properties of the film.

Abstract: Biaxially oriented polyester films which have a polyester-containing base layer (B) and a matt overlayer (A), and are characterized by the following features: a) the transverse shrinkage of the film is between 1 and 2.3%, b) the transverse linear expansion of the film during thermo-mechanical analysis is smaller than or equal to 0.2%, c) the matt overlayer comprises particles, preferably SiO2, whose median diameter is from 2 to 10 ?m and whose SPAN98 is smaller than or equal to 2, and d) the matt overlayer (A) comprises a polyester which has from 4 to 30 mol % of isophthalic acid units are notable in particular for low opacity, high transparency and low gloss of the overlayer (A), and are therefore suitable as flexible packaging films and for the purposes of hot lamination.

Abstract: The invention relates to a process for producing a biaxially oriented polyester film which has a base layer (B) and has a heatsealable outer layer (A) that can be peeled from polyester, where the outer layer (A) includes from 60 to 99 % by weight of polyester which is composed of from 12 to 89 mol % of units derived from at least one aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid, where the total of the molar percentages is 100, encompassing the steps of a) coextrusion of at least the base layer (B) and of the outer layer (A) to give an unoriented film, b) simultaneous, biaxial stretching of this unoriented film, and c) heat-setting of the stretched film.

Abstract: Coextruded, biaxially oriented polyester films which have a base layer (B) and have a heatsealable outer layer (A) that can be peeled from APET/CPET and from CPET, where the outer layer (A) includes a) from 60 to 99% by weight of polyester and b) from 1 to 10% by weight of inorganic and/or organic particles with a median diameter d50 of from 2 to 8 ?m, and where c) the polyester is composed of from 12 to 89 mol % of units derived from at least one aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid, and the non-sealable surface of the film has been rendered adhesion-promoting. The films of the invention are suitable as a packaging material for foods and other consumable items, and as a lid film for APET/CPET or CPET trays.

Abstract: The invention relates to a white, biaxially-oriented and coextruded polyester film which is matt on at least one side with at least one base layer B, which contains a cycloolefin copolymer (COC) in amounts of 4 to 60 wt. %, based on the weight of the base layer, in addition to polyester starting material. The glass transition temperature Tg of the COC lies in the range from 70 to 270° C. Said film has at least one matt outer layer (A), made from polyester and is particularly suitable for use in fast running machines such as winding, metallising, printing or laminating machines.

Abstract: Coextruded, biaxially oriented polyester films which have a white base layer (B) and have a heatsealable outer layer (A) that can be peeled from APET/CPET and from CPET, where the outer layer (A) includes a) from 80 to 99% by weight of polyester and b) from 1 to 10% by weight of inorganic and/or organic particles with a median diameter d50 of from 2.5 to 12 ?m, and where c) the polyester is composed of from 12 to 89 mol% of units derived from at least one aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid, and d) the ratio calculated from the particle size d50 of the particles and the layer thickness dA of the outer layer (A) is greater than or equal to 1, and the base layer (B) comprises an inorganic white pigment and/or a polymer incompatible with polyester. The films of the invention are suitable as a packaging material for foods and other consumable goods or as a lid film for APET/CPET or CPET trays.

Abstract: Coextruded, biaxially oriented polyester films which have a base layer (B) and have a heatsealable outer layer (A) that can be peeled from APET/CPET and from CPET, where the outer layer (A) comprises from 80 to 99% by weight of polyester and from 1 to 10% by weight of inorganic and/or organic particles with a median diameter d50 of from 2.5 to 12 ?m, and where the polyester is composed of from 12 to 89 mol % of units derived from at least one aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid, and the ratio calculated from the particle size d50 of the particles and the layer thickness dA of the outer layer (A) is ?1, and the base layer (B) comprises poly(-xyleneadipamide). The films of the invention are suitable, owing to their increased oxygen barrier, as a packaging material for foods and other consumable goods or as a lid film for APET/CPET or CPET trays.

Abstract: Coextruded, biaxially oriented polyester films which have a base layer (B) and have a heatsealable outer layer (A) that can be peeled from APET/CPET and from CPET, where the outer layer (A) includes a) from 80 to 98% by weight of polyester and b) from 2 to 10% by weight of inorganic and/or organic particles with a median diameter d50 of from 3 to 12 ?m, and where c) the polyester is composed of from 12 to 89 mol % of units derived from at least one aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid, and d) the ratio calculated from the particle size d50 of the particles and the layer thickness dA of the outer layer (A) is greater than or equal to 1.5, and the shrinkage of the films, at least in one direction, is more than 5%. The films of the invention are especially suitable, owing to their property of self-venting, as a lid film for APET/CPET or CPET trays.

Abstract: The present invention relates to a high-whiteness, biaxially oriented polyester film with at least a base layer made from polyester. The base layer of the polyester film of the invention also comprises from 2 to 60% by weight of a cycloolefin copolymer (COC), from 0.1 to 25% by weight of a white pigment, and, if desired, from 0 to 5% by weight of an optical brightener, based on the weight of the base layer. The glass transition temperature of the COC here is to be within the range from 70 to 270° C. The film is particularly suitable for packing foods or other consumable items which are sensitive to light and/or to air, or for use in industry, e.g. for producing hot-stamping foils or as a label film, or for image-recording papers, printed sheets, or magnetic recording cards, or for processing on high-speed machinery for winding, metallizing, printing or laminating.

Abstract: Biaxially oriented, co-extruded polyester films comprising a base layer consisting of at least 90 wt. % thermoplastic polyester, preferably polyethylene terephthalate (PET), at least one sealable outer layer and a second non-sealable outer layer and, optionally, other intermediate layers, in addition to at least one flame-retardant agent, preferably organic phosphorous compounds. The inventive films are characterized by low inflammability, no embrittlement when subjected to thermal stress and a surface which is devoid of troublesome opacity, and are suitable for a multiplicity of uses both indoors and outside. The outer layers contain anti-blocking agents such as silicic acid having a particle diameter of preferably less than 50 nm and/or more than 2 ?m. Preferably, the sealable outer layer consists of a copolyester which is made of ethylene terephthalate and ethylene isophthalate units.

Abstract: This invention relates to coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable from at least APET, the heatsealable and peelable top layer (A) consisting of a) 80-98% by weight of polyester and b) 2-10% by weight of inorganic and/or organic particles having an average diameter d50 of from 2.5 to 8.0 ?m (based on the mass of the top layer (A)), wherein c) the polyester being composed of 12-89 mol % of units which derive from at least one aromatic dicarboxylic acid and 11-88 mol % of units which derive from at least one aliphatic dicarboxylic acid, the sum of the dicarboxylic acid-derived molar percentages being 100, d) the ratio of particle size d50 and layer thickness dA of the top layer (A) being greater than 1.2 and e) the layer thickness of the top layer (A) dA being from 1.0 to 5 ?m. The invention further relates to a process for producing the film and to its use.

Abstract: The invention more particularly relates to a coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable from at least APET, the heatsealable and peelable top layer (A) consisting of a) 80-98% by weight of polyester and b) 2-10% by weight of inorganic and/or organic particles having an average diameter d50 of from 2.0 to 8.0 ?m (based on the mass of the top layer (A)), wherein c) the polyester being composed of 30-95 mol % of units which derive from at least one aromatic dicarboxylic acid and 5-70 mol % of units which derive from at least one aliphatic dicarboxylic acid, d) the ratio of particle size d50 and layer thickness dA of the top layer (A) being greater than 1.3 and e) the layer thickness of the top layer (A) dA being from 0.5 to 2.5 ?m.

Abstract: This invention relates to a coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable from at least the APET side of an APET/CPET tray, the heatsealable and peelable top layer (A) consisting of a) 50-95% by weight of polyester and b) 5-40% by weight of a polyester-incompatible polymer (=anti-PET polymer) based on the mass of the top layer (A), wherein c) the polyester is composed of 20-95 mol % of units derived from at least one aromatic dicarboxylic acid and 5-80 mol % of units derived from at least one aliphatic dicarboxylic acid, and d) the layer thickness dA is from 1.3 to 3.0 ?m. The invention further relates to a process for producing the film and to its use.