Abstract: Provided is a storage-stable polyurethane prepegs and mouldings produced therefrom composed of polyurethane compositions with liquid resin components, preferably liquid polyols. A prepeg contains(A)a fibrous support and (B)a matrix material containing a reactive polyurethane composition. The polyurethane composition contains a mixture of a liquid resin component(b)having a functional group reactive towards an isocyanate and having a glass transition temperature(Tg)or melting point below 25° C., with a hydroxyl number of 50 to 2000 mg KOH/gram, and a curing agent(a)comprising a di- or polyisocyanate internally blocked or blocked with a blocking agent. In addition, the polyurethane composition contains 0.6 to NCO equivalents or 0.3 to 1 uretdione group in (a) for each functional group of (b).

Abstract: The invention relates to a process for producing a prepreg based on polyurethane, which is notable for high storage stability at room temperature, a two-stage reaction mechanism, and adjustable adhesion on metal surfaces. It is based on the problem of making the surface tack of the prepregs controllable during processing. The solution is to assemble the PU mixture from which the matrix originates at a later stage such that the glass transition temperature of the thermoplastic polymer is above 30° C. For this purpose, the invention proposes two basically independent but certainly synergistic measures, namely: i) use of a polyol compound or a mixture of a number of polyol compounds as binder, the OH number or mean OH number of which is above 300 mg KOH/g, ii) choice of the proportion of hardener corresponding to the co-binder in the reactive composition at greater than 2% by weight, based on the total solids content of the reactive composition.

Abstract: The invention relates to a hybrid component part comprising a local stiffening made of a two-stage-crosslinked polyurethane-based fiber composite material, more particularly to the production of such a hybrid component part. Said invention has for its object to specify a technology which makes it possible in cost-effective fashion to effect local stiffening of metal parts with a fiber composite material in order thus to obtain a hybrid component part. It is a fundamental concept of the process according to the present invention to use a particular polyurethane formulation which in a first crosslinking reaction can be converted into a thermoplastic polymer and later in a second crosslinking reaction is fully crosslinked to afford a thermoset matrix material. The thermoplastic polymer is characterized by a good adhesion to metal surfaces. The metal can be subjected to further forming with the attached thermoplastic material.

Abstract: The invention relates to a process for producing storage-stable polyurethane prepregs and to moldings (composite components) produced therefrom. The prepregs and, respectively, components are produced by mixing (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalized (meth)acrylate monomers and/or hydroxy-functionalized (meth)acrylate polymers with uretdione materials. Photoinitiators can also optionally be added. This mixture or solution is applied by known processes to fiber material, e.g. carbon fibers, glass fibers or polymer fibers, and is polymerized with the aid of radiation or of plasma methods. Polymerization, e.g. at room temperature or at up to 80° C., gives thermoplastics or thermoplastic prepregs, and these can subsequently also be subjected to forming processes. The hydroxy-functionalized (meth)acrylate constituents can then be crosslinked with the uretdiones already present within the system, by use of elevated temperature.

Abstract: A method of producing a fiber composite component part, contains the following steps: a) providing two or more steel sheets; b) providing at least one textile fabric; c) providing an anhydrous mixture having one or more than one hardener containing a uretdione having an NCO functionality of not less than two, one or more than one binder having hydroxyl groups to an OH functionality of three to six, and one or more than one cobinder having oxirane groups; d) coating the textile fabric with the mixture; e) applying energy to the mixture-coated fabric for the purpose of performing a first crosslinking reaction to react hardener, binder and cobinder to form a thermoplastic polymer adhering to the textile fabric; f) hot pressing the steel sheets and the textile fabric together with the thermoplastic polymer adhering thereto into a sandwich such that the thermoplastic polymer joins the steel sheets together while enclosing the textile fabric; g) forming the sandwich into a shaped article; h) heat treating the shape

Abstract: A method of producing a fiber composite component part has the following steps: a) providing two or more metal sheets each comprising an aluminum material; b) providing at least one textile fabric; c) providing an anhydrous mixture having one or more than one hardener having a uretdione having an NCO functionality of not less than two, one or more than one binder having hydroxyl groups to an OH functionality of three to six, and one or more than one cobinder having oxirane groups; d) coating the textile fabric with the anhydrous mixture, to obtain a mixture-coated fabric; e) applying energy to the mixture-coated fabric for the purpose of performing a first crosslinking reaction to react hardener, binder and cobinder to form a thermoplastic polymer adhering to the textile fabric; f) hot pressing the metal sheets and the textile fabric together with the thermoplastic polymer adhering thereto into a sandwich such that the thermoplastic polymer joins the metal sheets together while enclosing the textile fabric; g

Abstract: Provided is a prepreg composed of a fibrous substrate impregnated with a reactive or highly reactive polymer composition as a matrix material. The reactive or highly reactive polymer composition contains a (meth)acrylate-based resin comprising at least one of a hydroxyl group, an amine group, a thiol group, an initiator and/or accelerator, and a di- or polyisocyanate which has been internally capped, capped with a capping agent, or a combination thereof. The (meth)acrylate-based resin contains from 20% by weight to 70% by weight of at least one (meth)acrylate monomer and from 1% by weight to 50% by weight of at least one prepolymer.

Abstract: The invention relates to a process for producing storage-stable polyurethane prepregs and mouldings produced therefrom (composite components). For production of the prepregs or components, for example, (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalized (meth)acrylate monomers and/or hydroxy-functionalized (meth)acrylate polymers are mixed with non-(meth)acrylic polyols and with uretdione materials. This mixture or solution is applied to fibre material, for example carbon fibres, glass fibres or polymer fibres, by known methods and polymerized thermally, via a redox initiation or with the aid of radiation or plasma applications. Polymerization, for example at room temperature or at up to 80° C., gives rise to thermoplastics or thermoplastic prepregs which can subsequently be subjected to a forming operation.

Abstract: The invention relates to a process for producing semi-finished composites and composite components. For production of the semi-finished products or components, (meth)acrylate monomers, (meth)acrylate polymers, polyfunctionalized (meth)acrylates, hydroxy-functionalized (meth)acrylate monomers and/or hydroxy-functionalized (meth)acrylate polymers are mixed with di- or polyisocyanates or with uretdione materials. This liquid mixture is applied by known processes to fibre material, for example carbon fibres, glass fibres or polymer fibres, and polymerized with the aid of a first temperature increase or of a redox accelerator or by means of photoinitiation. Polymerization, for example at room temperature or at up to 120° C., gives rise to thermoplastics which can still be subjected to a forming operation. The hydroxy-functionalized (meth)acrylate constituents can subsequently be crosslinked in a press with isocyanates or uretdiones already present in the system at a second temperature at least 20° C.

Abstract: The invention relates to a process for producing a prepreg based on polyurethane, which is notable for high storage stability at room temperature, a two-stage reaction mechanism, and adjustable adhesion on metal surfaces. It is based on the problem of making the surface tack of the prepregs controllable during processing. The solution is to assemble the PU mixture from which the matrix originates at a later stage such that the glass transition temperature of the thermoplastic polymer is above 30° C. For this purpose, the invention proposes two basically independent but certainly synergistic measures, namely: i) use of a polyol compound or a mixture of a number of polyol compounds as binder, the OH number or mean OH number of which is above 300 mg KOH/g, ii) choice of the proportion of hardener corresponding to the co-binder in the reactive composition at greater than 2% by weight, based on the total solids content of the reactive composition.

Abstract: The invention relates to a hybrid component part comprising a local stiffening made of a two-stage-crosslinked polyurethane-based fibre composite material, more particularly to the production of such a hybrid component part. Said invention has for its object to specify a technology which makes it possible in cost-effective fashion to effect local stiffening of metal parts with a fibre composite material in order thus to obtain a hybrid component part. It is a fundamental concept of the process according to the present invention to use a particular polyurethane formulation which in a first crosslinking reaction can be converted into a thermoplastic polymer and later in a second crosslinking reaction is fully crosslinked to afford a thermoset matrix material. The thermoplastic polymer is characterized by a good adhesion to metal surfaces. The metal can be subjected to further forming with the attached thermoplastic material.

Abstract: The invention relates to a process for producing storage-stable polyurethane prepregs and to mouldings (composite components) produced therefrom. The prepregs and, respectively, components are produced by mixing (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalised (meth)acrylate monomers and/or hydroxy-functionalised (meth)acrylate polymers with uretdione materials. Photoinitiators can also optionally be added. This mixture or solution is applied by known processes to fibre material, e.g. carbon fibres, glass fibres or polymer fibres, and is polymerised with the aid of radiation or of plasma methods. Polymerisation, e.g. at room temperature or at up to 80° C., gives thermoplastics or thermoplastic prepregs, and these can subsequently also be subjected to forming processes. The hydroxy-functionalised (meth)acrylate constituents can then be crosslinked with the uretdiones already present within the system, by use of elevated temperature.

Abstract: A method of producing a fibre composite component part has the following steps: a) providing two or more metal sheets each comprising an aluminium material; b) providing at least one textile fabric; c) providing an anhydrous mixture having one or more than one hardener having a uretdione having an NCO functionality of not less than two, one or more than one binder having hydroxyl groups to an OH functionality of three to six, and one or more than one cobinder having oxirane groups; d) coating the textile fabric with the anhydrous mixture, to obtain a mixture-coated fabric; e) applying energy to the mixture-coated fabric for the purpose of performing a first crosslinking reaction to react hardener, binder and cobinder to form a thermoplastic polymer adhering to the textile fabric; f) hot pressing the metal sheets and the textile fabric together with the thermoplastic polymer adhering thereto into a sandwich such that the thermoplastic polymer joins the metal sheets together while enclosing the textile fabric;

Abstract: A method of producing a fibre composite component part, contains the following steps: a) providing two or more steel sheets; b) providing at least one textile fabric; c) providing an anhydrous mixture having one or more than one hardener containing a uretdione having an NCO functionality of not less than two, one or more than one binder having hydroxyl groups to an OH functionality of three to six, and one or more than one cobinder having oxirane groups; d) coating the textile fabric with the mixture; e) applying energy to the mixture-coated fabric for the purpose of performing a first crosslinking reaction to react hardener, binder and cobinder to form a thermoplastic polymer adhering to the textile fabric; f) hot pressing the steel sheets and the textile fabric together with the thermoplastic polymer adhering thereto into a sandwich such that the thermoplastic polymer joins the steel sheets together while enclosing the textile fabric; g) forming the sandwich into a shaped article; h) heat treating the shape

Abstract: The invention relates to storage-stable polyurethane prepregs and mouldings produced therefrom composed of polyurethane compositions with liquid resin components, preferably liquid polyols.

Abstract: The invention relates to a process for producing polyurethane prepregs which are stable during storage, and to mouldings (composite components) produced therefrom. The prepregs or components are produced by mixing (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalized (meth)acrylate monomers and/or hydroxy-functionalized (meth)acrylate polymers with uretdione materials and moreover with aromatic amines which accelerate a free-radical polymerization reaction. This mixture or solution is applied by known processes to fibre material, e.g. carbon fibres, glass fibres or polymer fibres, and is polymerized at room temperature or higher temperatures with the aid of initiators, e.g. dibenzoyl peroxide. Instead of amine acceleration and subsequent hardening with initiators, it is also possible to use other known room-temperature curing systems, e.g. permaleate systems. Polymerization, e.g. at room temperature or at up to 80° C.

Abstract: The invention relates to prepregs based on a storage-stable reactive or highly reactive polyurethane composition for producing composite components having visible carbon fibre fabrics or scrims.

Abstract: The invention relates to prepregs based on storage-stable reactive or highly reactive polyurethane composition with fixed film and the composite component produced therefrom.

Abstract: The invention relates to prepregs coloured with pigment or dye preparations and based on a storage-stable reactive or highly reactive polyurethane composition.

Abstract: The invention relates to a process for the surface-finishing of plastics substrates, preferably polymethyl methacrylate (abbreviated hereinafter to PMMA), by coating with a clear coating material comprising nanoparticles (hereinafter nanocomposite coating material) and irradiating the same with vacuum UV light of wavelength 172 nm from an Xe* excimer lamp. This process leads to excellent adhesion of the coating substance on the substrate. It is moreover possible to give the coating surface a topography. The mechanical and chemical properties and performance characteristics of uncoated substrate are substantially exceeded when a substrate is coated in this way.