Abstract: The present invention relates to a sheet, characterized in that two opposite surfaces have elements which can transmit significant tensile forces in the plane of the sheet.

Abstract: Flat composites of plastic are manufactured by thermal adhesive bonding of at least two plastic parts which are heated at their surfaces and which comprise a base material coated with a plastic layer, wherein the Vicat softening point of the plastic of layer is 5 to 40° C. lower than that of the base material, wherein the base material has a thickness of 1 to 200 mm and the plastic layer has a thickness of 5 to 400 ?m, and each of the parts is heated on the surfaces coated with the plastic layer and then welded under pressure.

Abstract: Flat composites of plastic are manufactured by thermal adhesive bonding of at least two plastic parts which are heated at their surfaces and which comprise a base material coated with a plastic layer, wherein the Vicat softening point of the plastic of layer is 5 to 40° C. lower than that of the base material, wherein the base material has a thickness of 1 to 200 mm and the plastic layer has a thickness of 5 to 400 &mgr;m, and each of the parts is heated on the surfaces coated with the plastic layer and then welded under pressure.

Abstract: Multilayer plastic composites containing at least two incompatible plastics, A and B, in which the layering sequence alternates between A and B, the layers of plastic B are discontinued at regular intervals, and the resulting gaps in the layers are filled in with plastic A, exhibit good adhesion between the layers. In preferred embodiments of the invention, the amorphous, crystalline, or semi-crystalline plastic B has a higher coefficient of thermal expansion than the amorphous plastic A. The plastic composite is preferably produced via coextrusion.

Abstract: A light-permeable, IR-reflecting body which contains a stiff, amorphous base material comprised of light-permeable plastic and IR-reflecting particles which are oriented parallel to the surface, said light-permeable IR-reflecting body having a transmissivity (T) in the visible range of 45-75%, an overall energy permeability (g) of 30-60%, and a T/g ratio of >1.15, and the IR-reflecting particles oriented parallel to the surface are disposed in a coating layer comprised of a transparent water-insoluble binder, which layer is 5-40 micron thick and adheres to the base material, wherewith red-reflecting particles with a layer of titanium dioxide 60-120 nm thick on a platelet-shaped carrier pigment are present in the aforesaid coating layer in the amount of 20-40 wt. % of said coating layer.

Abstract: A light-permeable, IR-reflecting body which contains a stiff, amorphous base material comprised of light-permeable plastic and IR-reflecting particles which are oriented parallel to the surface, said light-permeable IR-reflecting body having a transmissivity (T) in the visible range of 45-75%, an overall energy permeability (g) of 30-60%, and a T/g ratio of >1.15, and the IR-reflecting particles oriented parallel to the surface are disposed in a coating layer comprised of a transparent water-insoluble binder, which layer is 5-40 micron thick and adheres to the base material, wherewith red-reflecting particles with a layer of titanium dioxide 60-120 nm thick on a platelet-shaped carrier pigment are present in the aforesaid coating layer in the amount of 20-40 wt. % of said coating layer.

Abstract: The invention relates to the use of special plastic panels comprising integrated cavities as what are termed separator plates for plate separators in sewage treatment.

Abstract: The invention relates to optical diffuser plates (1) made of transparent plastics such as polycarbonate or polymethacrylate. Several thin strips (2) made of plastic B inserted into plates made of transparent plastic A with the proviso that A and B are incompatible and the strips (2) made of plastic B are subsequently withdrawn. The hollows that are formed in the plate (1) made of plastic A are used to deflect light.

Abstract: A photovoltaic element having two plane or curved plates (1) and (2), which are joined by a circumferential seal (3) at a spacing ranging from 2 to 20 mm, thus forming a cavity (4) in which there are enclosed a plurality of photovoltaic cells (5), each of which is attached to only one of the two plates (2) using an adhesive (6), at least this plate (2) being transparent, wherein both plates are made of plastic that is permeable to water vapor and the adhesive with which the photovoltaic cells are attached covers at most 30% of the area of the individual photovoltaic cells can be used for applications such as roofing and illuminating bus stops.

Abstract: Multilayer plastic composites containing at least two incompatible plastics, A and B, in which the layering sequence alternates between A and B, the layers of plastic B are discontinued at regular intervals, and the resulting gaps in the layers are filled in with plastic A, exhibit good adhesion between the layers. In preferred embodiments of the invention, the amorphous, crystalline, or semi-crystalline plastic B has a higher coefficient of thermal expansion than the amorphous plastic A. The plastic composite is preferably produced via coextrusion.

Abstract: Flat composites of plastic are manufactured by thermal adhesive bonding of at least two plastic parts which are heated at their surfaces and which comprise a base material coated with a plastic layer, wherein the Vicat softening point of the plastic of layer is 5 to 40° C. lower than that of the base material, wherein the base material has a thickness of 1 to 200 mm and the plastic layer has a thickness of 5 to 400 &mgr;m, and each of the parts is heated on the surfaces coated with the plastic layer and then welded under pressure.

Abstract: Multilayer plastic composites containing at least two incompatible plastics, A and B, in which the layering sequence alternates between A and B, the layers of plastic B are discontinued at regular intervals, and the resulting gaps in the layers are filled in with plastic A, exhibit good adhesion between the layers. In preferred embodiments of the invention, the amorphous, crystalline, or semi-crystalline plastic B has a higher coefficient of thermal expansion than the amorphous plastic A. The plastic composite is preferably produced via coextrusion.

Abstract: A photovoltaic element having two plane or curved plates (1) and (2), which are joined by a circumferential seal (3) at a spacing ranging from 2 to 20 mm, thus forming a cavity (4) in which there are enclosed a plurality of photovoltaic cells (5), each of which is attached to only one of the two plates (2) using an adhesive (6), at least this plate (2) being transparent, wherein both plates are made of plastic that is permeable to water vapor and the adhesive with which the photovoltaic cells are attached covers at most 30% of the area of the individual photovoltaic cells can be used for applications such as roofing and illuminating bus stops.

Abstract: A multiribbed plate of an impact-resistant polymethyl methacrylate SP, wherein the impact-resistant polymethyl methacrylate SP is made of:p1) 4-30 wt % of an elastomer phase E of crosslinked polymer particles VP, made of 60-99.9 parts by weight alkyl acrylate, aryl acrylate or a mixture thereof, 0.1-10 parts by weight of one or more crosslinking agents, and 0-30 parts by weight of one or more monofunctional ethylenically unsaturated comonomers; andp2) 70-96 wt % of a thermoplastic matrix phase M of polymethyl methacrylate P, containing from 0 to 20 parts by weight, relative to 100 parts by weight P, of units from one or more comonomers,wherein the elastomer phase E and the matrix phase M have refraction indices which are the same or which deviate from one another by a value n, wherein n.ltoreq.0.02, and the sum of p1) and p2) is 100 wt %, and wherein the multiribbed plate has specific geometric construction requirements providing high impact-resistance and hail resistance.

Abstract: A process for the extrusion of plastic plates with very finely structured surface using an extrusion system which is equipped with an extruder and a three roll polishing stack containing a roller with the structuring surface. The system is designed for coextrusion and the plastic plates are produced via two extruders as a coextrudate CX from a highly viscous basic molding compound BF and a low viscosity molding compound NF which is extruded on BF. The surface of said plates is structured via the three roll polishing stack. Fresnel lenses produced by the process may be used in solar collectors.

Abstract: The invention relates to composites VS comprising at least two plastic layers A and C, suitable for the production of articles which, on one surface, come into contact with water at temperatures between 0.degree. and 90.degree. C., wherein the layer A, which comes into contact with water, comprises a thermoplastic, impact-resistant polymethyl methacrylate plastic SP having a Vicat softening temperature of at least 95.degree. C. according to ISO 306 procedure B and a notch impact resistance of at least 3.0 kJm.sup.-2 according to ISO 180 1A, and layer C comprises an impact-resistant acrylonitrile-styrene copolymer VP. In a preferred specific embodiment of the invention, another layer B, made of a thermoplastic polymethyl methacrylate plastic P, is placed between layers A and C.

Abstract: A process for the extrusion of plastic plates with very finely structured surface using an extrusion system which is equipped with an extruder and a three roll polishing stack containing a roller with the structuring surface. The system is designed for coextrusion and the plastic plates are produced via two extruders as a coextrudate CX from a highly viscous basic molding compound BF and a low viscosity molding compound NF which is extruded on BF. The surface of said plates is structured via the three roll polishing stack. Fresnel lenses produced by the process may be used in solar collectors.