Abstract: A five layer, biaxially-oriented polyolefin film, which is sealable on both exterior surfaces and includes a base layer of polypropylene which carries polyolefinic intermediate layers on both surfaces, and two sealing layers of sealable olefin polymers which are disposed, respectively, on the intermediate layers. The intermediate layers include 0.2-2.0% by weight of a polydialkylsiloxane having a viscosity of less than about 500 mm2/s. The film is particularly well-suited for the reception of aqueous printing inks or as a substrate for aqueous coating systems.

Abstract: A biaxially-oriented film with high mechanical strength, which includes 69 to 94.99% by weight of a polyolefin, 5 to 30% by weight of a natural or synthetic resin having a softening point in the range from 70.degree. to 170.degree. C., and 0.01 to 1% by weight of a nucleating agent, based on the total weight of the film. A method for producing this film includes biaxially drawing the film at temperatures below the melting point of the polyolefin.

Abstract: A biaxially stretch-oriented film, suitable for the process of transfer metallizing, which comprises a base layer coextruded with covering layers on either side thereof and comprising an inert admixture is disclosed. The three layers are formed of polyolefin and the base layer comprises an additive which migrates from the base layer into the covering layers. The base layer contains the inert admixture in the form of finely divided particles, which partially protrude from the base layer and are completely enveloped by the covering layers. At least one of the two outer surfaces of the covering layers displays, at least in partial areas, an increased roughness attributable to the particles protruding from the base layer.

Abstract: A non-sealable, multi-layer polypropylene film which includes a base layer of polypropylene and at least one cover layer. The cover layer includes a propylene-ethylene copolymer which includes about 1.2 to 2.8% by weight of ethylene and has a distribution factor V.sub.F greater than about 10, an enthalpy of fusion .DELTA.H.sub.m greater than about 90 J/g and a melt index of about 3 to 12 g/10 min. under a load of 21.6N and about 230.degree. C. The film is particularly useful in laminating and as a support film for aqueous coating systems.

Abstract: A process for producing a metallizable, sealable, biaxially stretch-oriented multi-ply film includes the steps of: providing melts of a predominantly polypropylene base layer, and first and second polyolefinic facing layers; co-extruding the melts through a flat film die, wherein the first and second polyolefinic facing layers are co-extruded on either side of the base layer; solidifying the co-extruded film by cooling; longitudinally stretching the co-extruded film at a temperature from about 120.degree. to 130.degree. C. in a ratio of from about 5 to 7:1; transversely stretching the co-extruded film at a temperature from about 160.degree. to 170.degree. C. in a ratio of from about 8 to 10:1; and corona-treating one facing layer of the co-extruded film which is metallizable. Each of the melts contains a calcium carbonate neutralizing agent having an absolute particle size of less than about 10 .mu.m, a mean particle size of less than about 0.1 .mu.m, a specific surface area of more than about 40 m.sup.

Abstract: A shrink film comprising at least one polyolefinic layer comprising polypropylene and a resin admixture is disclosed. The film processes a shrinkability of more than 20%, measured at 90.degree. C., in the transverse direction and of less than 8%, also measured at 90.degree. C., in the longitudinal direction. The film is manufactured by coextrusion followed by stretching in the longitudinal and transverse directions, whereby stretching in the longitudinal direction is performed such that the birefringence value .DELTA.n of the longitudinally oriented film does not exceed the range from 10.times.10.sup.-3 to 13.times.10.sup.-3.

Abstract: A three layer, biaxially-oriented polyolefin film which is sealable on both exterior surfaces and includes a base layer of polypropylene which carries two sealing layers of sealable olefin polymers. The base layer includes about 0.5 to 2% by weight of polydialkylsiloxane having a viscosity of less than about 500 mm.sup.2 /s. The film is particularly well-suited for the reception of aqueous printing inks or as a substrate for aqueous coating systems.

Abstract: The extruded, biaxially oriented dielectric film is composed of high-purity electrical film raw material. It is suitable as electrical insulating film in particular as a dielectric in an electrical capacitor, and exhibits improved dielectric properties for this prupose. The film comprises propylene polymers and stabilizers for the propylene polymers. The raw material of the film has an idealized thermo-oxidation temperature in the range from 260.degree. to 300.degree. C., preferably 260.degree. to 280.degree. C. The dielectric film has an idealized thermo-oxidation temperature of 250.degree. to 300.degree. C., in particular 250.degree. to 280.degree. C. The content of organic neutralizing agents, in particular calcium stearate, in the raw material is less than/equal to 100 ppm.

Abstract: Disclosed is an opaque, biaxially stretch-oriented, polyolefinic multilayered film comprising an opaque core layer and two transparent top layers. The core layer contains a mixture of1) about 45 to 90% by weight of a thermoplastic polymer comprising propylene,2) about 5 to 25% by weight of an inert, particulate filler, and3) about 5 to 30% by weight of a hydrocarbon resin being compatible with the thermoplastic polymer and having a softening point in the range from about 100.degree. to 160.degree. C.,the percentages being each time related to the total weight of the mixture. The top layers are free from admixtures comprising particulate filler and resin. The film possesses high resistance to delamination.

Abstract: Moldings having a thickness of 1 to 60 mm and made of flexible webs or rigid sheet of plastic are passed through a corona discharge treatment system consisting of high-voltage electrodes and a counter-electrode and a high-frequency alternating current voltage of 20 to 25 kHz and 20 to 70 kV is applied to the high-voltage electrodes by a generator. A corona discharge forms in the gap between the high-voltage electrodes and the counter-electrode. An aerosol formed by atomizing a liquid is blown into the corona discharge zone by means of an air or gas stream. The aerosol modifies the surface of the sheet-like molding in the desired manner.

Abstract: A self-supporting sheet-like article is described which is comprised of a substrate layer and an antistatic coating applied to at least one surface of the substrate layer. The antistatic coating is produced by the treatment of at least one surface of the substrate layer with an electrical corona discharge which runs between a live electrode and a counter electrode. Simultaneously, i.e. during the corona discharge, an aerosol is introduced into the corona discharge area, which aerosol contains an antistatic agent. Furthermore, a procedure for the production of a self-supporting sheet-like article with an antistatic coating as well as a firmly adhering antistatic coating on a polymer substrate are described.

Abstract: A sheet-like structure consists of an adhesion-promoting coating on at least one surface of the substrate. The adhesion-improving coating is produced by treating this substrate surface with an electrical corona discharge between high voltage electrodes and a grounded counter-electrode while simultaneously spraying an aerosol into the corona discharge zone. The aerosol contains, for example, an aqueous emulsion of thermoplastic and/or crosslinkable components as an adhesion-promoting agent.

Abstract: A metallizable, heat-sealable, biaxially oriented multi-layer film for metallizing applications is described which comprises a base layer comprising polypropylene, a first polyolefinic heat-sealable surface layer and a second polyolefinic metallizable surface layer. The second polyolefinic metallizable surface layer comprises a propylene-ethylene copolymer, which has an ethylene content of 1.2 to 2.8% by weight, a distribution factor V.sub.F greater than 10, an enthalpy of fusion .DELTA. H.sub.m greater than 90 J/g and a thermo-oxidation temperature T.sub.ox greater than 240.degree. C.

Abstract: An opaque polyolefin film having a base layer composed essentially of propylene polymers and having sealing layers present on both sides, composed essentially of sealable olefin polymers, is disclosed. From about 0.2% to 1.5% by weight, relative to the layer of polydialkylsiloxane is incorporated in one of the two sealing layers, and this layer has not been subjected to corona treatment. The other sealing layer has been subjected to corona treatment and has polydialkylsiloxane, not incorporated, but present on the outer surface of this layer, the polydialkylsiloxane having been transferred to this layer by contact between the sealing layer in which polydialkylsiloxane is incorporated. The relative polydialkylsiloxane occupancy of this layer, which is determined by means of ESCA spectroscopy, is not more than 15. The three-layer opaque polyolefin film is prepared by the coextrusion process. It is particularly suitable for use as a packaging film on high-speed packaging machines.

Abstract: A metallizable, sealable, biaxially stretch-oriented multi-ply film comprises a base layer essentially of polypropylene, a first polyolefinic facing layer and a second polyolefinic facing layer. All of the layers contain a neutralizing agent and a stabilizer against thermal degradation. The neutralizing agent is a calcium carbonate having an absolute particle size of less than 10.0 .mu.m, a mean particle size of less than 0.1 .mu.m, a specific surface area of more than 40 m.sup.2 /g and a whiteness of more than 90% and, the stabilizer comprises a phenolic stabilizer having a molecular weight of more than 1,000 g/mol. One polyolefinic facing layer contains an anti-blocking agent. In addition, a process for producing the metallizable multi-ply film is described, and its use as a packaging material is indicated.

Abstract: A coextruded, biaxailly oriented multilayer film comprises a base layer comprising an extremely pure raw material and outer layer. It is suitable for use as an electrically insulating film, as a dielectric in an electrical capacitor, and has improved dielectrical properties for this purpose. The base layer and the outer layer or layers contain propylene polymer on one or both sides and stabilizers for propylene polymers. The raw material for the base layer has an idealized thermal oxidation temperature in the range of 260.degree. to 300.degree. C., preferably in the range 260.degree. to 280.degree. C., and the raw material for the outer layer or layers has an idealized thermal oxidation temperature in the region of 240.degree. to 300.degree. C., preferably in the range 240.degree. to 270.degree. C. The multilayer film as a whole has an idealized thermal oxidation temperature in the range 250.degree. to 290.degree. C., in paticular in the range 250.degree. to 275.degree. C.

Abstract: Pretreating the surface of electrically conducting molded materials, such as metal foil or plastic films in whose polymer matrix electrically conducting particles have been incorporated, by means of electrical corona discharge is provided. A generator subjects the high voltage discharge electrodes of the corona discharge to a high-frequency alternating current of high voltage. The metal core of a roller, over whose metallic circumference a film web or foil is transported, serves as the grounded metallic counter-electrodes. A housing encloses the high voltage electrodes of the corona discharge and is connected via a line to an atomizer apparatus, in which a liquid is atomized to give a suspendible aerosol by means of a piezoelectric ultrasonic vibrator system or by two-material atomizer nozzles operating at the speed of sound.

Abstract: For surface pre-treatment of a plastic article, such as a film sheet or the interior of a plastic molded article, by means of electrical corona-discharge, a device is provided having a generator 5 and a corona discharge device 11. The generator applied a high-frequency, high-voltage alternating current to the discharge electrodes 4 of the corona-discharge device 11. The grounded counterelectrode used is the metal core 2 of a roller 10 over whose peripheral coating 3 a film sheet 1 is transported. A housing 6 encompasses the electrodes 4 of the corona-discharge device 11 and is connected via a line 7 to an atomizer 8 in which a liquid is atomized to form an aerosol by means of a piezoelectrically operating ultrasonic vibration system or by two-component atomizer nozzles which operate at ultrasonic speed. A fan 9, the throughput rate of which can be regulated, is connected to the atomizer 8 and pushes the carrier gas, for example, air, for the aerosol through the atomizer into the corona-discharge device 11.

Abstract: A biaxially stretch-oriented multilayer film is disclosed which is produced by coextrusion and is suitable as a release sheet in the production of decorative laminate panels having a matte surface finish. The film comprises a base layer essentially comprising polypropylene and at least one top layer. The top layer essentially comprises(a) 98.5% to 99.6% by weight of a propylene homopolymer and(b) 0.4% to 1.5% by weight of a polydiorganosiloxane,relative to the weight of the top layer.

Abstract: A process is described for the production of an oriented, heat-set polyester film including an admixture of polydiorganosiloxane in the amount of 0.001 to 2% by weight, as well as further additives, such as inert inorganic and/or organic particles. The thermoplastic material is melted in an extruder and extruded through an appropriate die to give a cast film, is then quenched, reheated, stretch oriented, and heat set. The characteristic criteria is the addition of the polydiorganosiloxane to the polydiorganosiloxane-free polyester in the form of a masterbatch.