A building aperture cover frame, such as a window frame, having at least one frame profile for framing an insulated glass unit, where the frame profile includes: an insulating core of insulating polyurethane foam core material enclosed by a core surface of the insulating core, where the insulating polyurethane foam core material having at least 85% by weight polyurethane, and where the insulating polyurethane foam core material is of a material density of less than 60 kg/m.sup.3, such as less than 50 kg/m.sup.3, preferably less than 40 kg/m.sup.3, a profile shell encapsulating the insulating core and having an inner shell surface facing the core surface, where the profile shell is made of at least 90% by weight polyurethane, and where the profile shell is of a material density of at least 600 kg/m.sup.3, such as at least 750 kg/m.sup.3, preferably at least 850 kg/m.sup.3, and one or more metal reinforcement element(s) located between opposing parts of the inner shell surface and the core surface.

The process for the realization of door and window frames made of plastic material comprises: a step of providing a profiled element (1) made of plastic material for the realization of door and window frames; a step of providing a reinforcing element (8) made of metal material, the profiled element (1) having a containment seat (6) of the reinforcing element (8); a step of inserting the reinforcing element (8) inside the containment seat (6); a step of fixing the reinforcing element (8) to the profiled element (1) by means of fixing means (9) between at least a portion of the profiled element (10) and at least a portion of the reinforcing element (11);
wherein the fixing step comprises a heating step of the portion of the reinforcing element (11) by means of electromagnetic induction means (12), the fixing means (9) being adapted to cooperate with at least one of the portion of the profiled element (10) and the heated portion of the reinforcing element (11) for the fixing of the portion of the reinforcing element (11) to the portion of the profiled element (10).

A building aperture cover frame, such as a window frame, having at least one frame profile for framing an insulated glass unit, where the frame profile includes an insulating core of insulating polyurethane foam core material enclosed by a core surface of the insulating core, where the insulating polyurethane foam core material having at least 85% by weight polyurethane, and where the insulating polyurethane foam core material is of a material density of less than 60 kg/m.sup.3, such as less than 50 kg/m.sup.3, preferably less than 40 kg/m.sup.3, a profile shell encapsulating the insulating core and having an inner shell surface facing the core surface, where the profile shell is made of at least 90% by weight polyurethane, and where the profile shell is of a material density of at least 600 kg/m.sup.3, such as at least 750 kg/m.sup.3, preferably at least 850 kg/m.sup.3, and one or more metal reinforcement element(s) located between opposing parts of the inner shell surface and the core surface.

An acrylic-polyurethane hybrid sealant composition is provided with desirable physical and mechanical properties such as superior adhesion, tensile strength, rheology and bond strength. In particular, the sealant composition of the invention is formulated with isocyanate modified acrylic polymer The composition includes an acrylic pre-polymer, an isocyante functional monomer, a triacrylate as a cross-linker, and a catalyst. A process for preparing the composition is also provided. The hybrid sealant composition is well suited for sealing and bonding requirements in fabrication of articles such as window glazing, back bedding, construction, aerospace and appliances industries. A hybrid sealant composition is provided that develops adequate adhesion and bond strength equivalent to commercially available sealants when used in sealing and bonding applications and is readily formulated to be self-leveling. Articles so fabricated using the hybrid sealant composition are also provided.