Abstract: The invention relates to a biaxially oriented polyester film with a base layer at least 80% by weight of which is composed of a thermoplastic polyester, and with at least one matte outer layer which comprises a mixture or a blend of two components I and II wherein components I and II render the at least one outer layer matte. The invention further relates to the methods for use of the film and to a process for its production. Component I of the mixture or of the blend is a polyethylene terephthalate homopolymer or polyethylene terephthalate copolymer or a mixture of homo- or copolymers. Component II of the mixture or of the blend is a polyethylene terephthalate copolymer which is composed of the condensation product of the following monomers and/or of their derivatives capable of forming polyesters: isophthalic acid, aliphatic dicarboxylic acid, sulfomonomers and aliphatic or cycloaliphatic glycols.

Abstract: The present invention relates to a milkily translucent, biaxially oriented polyester film with at least a base layer which comprises up to 5% by weight of a cycloolefin copolymer (COC), based on the weight of the base layer, the glass transition temperature of the COC being within the range from 70 to 270° C. 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. for producing hot-stamping foils or as a label film, or for image-recording papers, printed sheets, or magnetic recording cards, or for metallization.

Abstract: The invention relates to a biaxially oriented polypropylene film which has very good optical properties and good processing performance and which, after it has been metallized or has been coated with oxidic materials, has a high oxygen barrier value, and whose structure has at least one base layer B and at least one layer A applied to this base layer, where this layer A has a specified number of elevations of specified height and specified diameter. The invention further relates to the use of the film and to a process for its production.

Abstract: The present invention relates to a single or multilayer biaxially oriented film having a thickness of ≦12 &mgr;m, in which Ts (TD) is ≧160° C., S 200 (TD) is ≦5%, S 200 (MD) is 2-5%, the shrinkage force ratio Ns 220/Ns 160 is ≧4.5; the film fixing peak is ≧210° C.; the film density is 1.39-1.41 g/cm3, and Ts (TD) is the temperature at which the transverse shrinkage begins, S 200 (TD) is the shrinkage in the transverse direction (in %) at 200° C., S 200 (MD) is the shrinkage in the machine direction (in %) at 200° C., Ns 220 is the shrinkage force (in N) at 220° C. and Ns 160 is the shrinkage force (in N) at 160° C. in the transverse direction. The invention also relates to a method for forming the film.

Abstract: The invention relates to a three-layer, biaxially oriented polyester film which has better abrasion properties than prior art films, together with very good electromagnetic properties. The structure on the two sides of the film in composed of at least one base layer B and, applied to this base layer, outer layers A and C, wherein the outer layer A has a roughness gas flow greater than 1000 sec and less than 2000 sec, and the outer layer C has a roughness profile gas flow of less than 600 sec. The invention further relates to a process for producing the film, and to its use as a magnetic tape film.

Abstract: The invention relates to a biaxially oriented polyester film which, after metallization, has low oxygen permeation and good adhesion to the metallization, and is composed of at least one base layer B and, applied to this base layer, at least one layer A, where this layer A i) has, per mm2 of film surface, a number N of elevations whose respective heights h and diameters d are correlated by the following equations: log N/mm2<Ah−Bh*log h/&mgr;m, 0.05 &mgr;m<h<1.0 &mgr;m  (1) wherein Ah=1.4; Bh=2.5 log N/mm2<Ad−Bd*log d/&mgr;m, 0.2 &mgr;m<d<10.0 &mgr;m  (2) wherein Ad=3.4; Bd=2.4 and ii) has a copolyester coating derived from isophthalic acid and a sulfomonomer.

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 copolymer or of a mixture of polymers which comprises at least 35 mol % of ethylene 2,6-naphthalate units, up to 44 mol % of ethylene terephthalate units, and from 1 to 20 mol % of ethylene isophthalate units, and also up to 20 mol % of a sulfo-substituted dicarboxylic acid and, if desired, up to 10 mol % of units from aliphatic, including cycloaliphatic, or aromatic diols and/or dicarboxylic acids (based in each case on the total content of dicarboxylic acid or diol).

Abstract: The invention relates to a metallized or ceramically coated, biaxially oriented polyester film with high oxygen barrier and built up from at least one base layer B and, applied to this base layer, at least one outer layer A, where this outer layer A has a defined number of elevations of defined height and diameter, and where at least this outer layer A is metallized or ceramically coated. The invention also 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 a mixture of polymers which comprises at least 40% by weight of ethylene 2,6-naphthalate units and up to 60% by weight of ethylene terephthalate units and/or of units from aliphatic, including cycloaliphatic, or aromatic diols and/or dicarboxylic acids, with the proviso that the T.sub.g 2 value of the polyester film is above the T.sub.g 2 value of the base layer but below the T.sub.g 2 value of the outer layer, and the base layer comprises particles. The film has low oxygen transmission. It is particularly suitable for packaging applications, specifically for packaging foods and other consumable items, or as a can liner, a lid film or a thermo-transfer ribbon.

Abstract: The invention relates to a biaxially oriented polyester film having one or more layers and a thickness of .ltoreq.10 .mu.m, where the mechanical consolidation coefficient MC, given by the following equation, lies within the ranges given below:MC here is .gtoreq.-2, preferably >0 and in particular >0.5, particularly preferably .gtoreq.1, and is .ltoreq.50, preferably .ltoreq.30 and particularly preferably <5 ##EQU1## S200.sub.TD is the transverse shrinkage in % at 200.degree. C. after 15 min.S200MD is the longitudinal shrinkage in % at 200.degree. C. after 15 min.T2% is the temperature in .degree. C. at which the film elongates by 2% under a constant tension of 5 N/mm.sup.2.E.sub.TD is the transverse modulus of elasticity (tensile modulus) at room temperature (21.degree. C.) in N/mm.sup.2.

Abstract: A device for laying a molten film 3 emerging from a slot die 2 onto a rotating take-off chill roll 1 has at least one electrode which is arranged parallel to and at a short distance from the surface of the take-off roll 1 and to which a high voltage in the range from 4 to 12 kV is applied. This electrode is, for example, a metal strip 5 which has a tapering sharp edge 6 that is oriented toward the surface of the take-off roll 1. In addition to this metal strip 5, a second electrode 27 is arranged at a distance from the surface of the take-off roll. This second electrode is a metal strip without a strip edge and has applied to it a voltage of a magnitude that is equal to or different from that of the metal strip 5. As a result, electric fields are formed in addition to the electric field from the one metal strip electrode 5.

Abstract: A thermoplastic raw material, such as a polyester, containing particles (I) having an average particle diameter of <0.5 .mu.m and particles (II) having an average particle diameter of from 3.3 to 4.0 .mu.m, is useful, for example, in the production of an oriented monolayer or multilayer film having a total thickness of .ltoreq.4 .mu.m and a roughness on at least one film surface of R.sub.a <30 nm, the surface gas flow time t on at least one film surface being <2900 sec and the winding stability of the film being at least 8000. The film is useful, for example, as a capacitor film.

Abstract: The application discloses a transparent, biaxially oriented polyester film having a base layer of at least 80% by weight which is composed of at least a thermoplastic polyester, and having at least one cover layer, wherein the cover layer is composed of a polymer or a mixture of polymers which comprises at least 40% by weight of ethylene 2,6-naphthalate units and optionally up to 60% by weight of ethylene terephthalate units and/or optionally units from aliphatic, cycloaliphatic or aromatic diols, and/or optionally aliphatic, cycloaliphatic and aromatic dicarboxylic acids, with the proviso that the T.sub.g 2 value of the polyester film is above the T.sub.g 2 value of the base layer but below the T.sub.g 2 value of the cover layer. The film has low atmospheric oxygen transmission. It is particularly suitable for packaging applications, specifically for packaging foodstuffs and other consumable items.

Abstract: Biaxially oriented films containing at least one layer of polyethylene naphthalate bibenzoate (PENBB) copolyester wherein the copolyester contains from about 60 to about 40 mol % of a first recurring unit of the formula (II). ##STR1## and about 40 to about 60 mol % of a second recurring unit of formula (I). The copolyester preferably contains less than 10 mol % of recurring units derived from terephthalate or other dicarboxylic acids. The films have a total thickness of 0.05-500 .mu.m and may contain inert particles.