The invention particularly relates to a method of applying a permanent coating to a plastic surface of a first part, comprising the following steps: applying to said plastic surface a layer of a polyamide-based hot-melt material, maintaining this layer of hot-melt material on said plastic surface for a period of time ranging from a few minutes to several hours, removing this layer of hot-melt material from this plastic surface; and applying a permanent coating to said surface, said permanent coating being based on polyurethane, an epoxy resin or polyesters, a polycarbonate and/or an acrylic resin; as well as the use of such a method in the automotive industry.

This disclosure is directed to methods directly adhering epoxy-based, and other thermosetting surfacing films to solid thermoplastic surfaces and the structures derived or derivable from these methods. In some embodiments, the disclosure is also directed to composite structures comprising a thermoplastic substrate directly bonded to a thermoset(ting) surfacing film; wherein the direct bonding defines an interface between a thermoplastic surface of the thermoplastic substrate and a first surface of the thermoset(ting) surfacing film.

A method for surface preparation of composite substrates prior to adhesive bonding. A curable surface treatment layer containing blocked isocyanate compounds is applied onto a curable composite substrate, followed by co-curing. The surface treatment layer may be a resin layer without fibers or a removal peel ply composed of resin-impregnated fabric. After surface preparation, the composite substrate is provided with a chemically-active, bondable surface that can be adhesively bonded to another composite substrate to form a covalently-bonded structure.

A method for surface preparation of composite substrates prior to adhesive bonding. A curable surface treatment layer containing blocked isocyanate compounds is applied onto a curable composite substrate, followed by co-curing. The surface treatment layer may be a resin layer without fibers or a removal peel ply composed of resin-impregnated fabric. After surface preparation, the composite substrate is provided with a chemically-active, bondable surface that can be adhesively bonded to another composite substrate to form a covalently-bonded structure.

A primer-attached thermoplastic resin material having a thermoplastic resin material and one or plural primer layers laminated on the thermoplastic resin material, wherein at least one layer of the primer layers is an in-situ polymerizable composition layer of an in-situ polymerizable composition polymerized on the thermoplastic resin material.

A method is provided for manufacturing an adhesively bonded structure including first and second components including first and second outer surfaces, respectively, at least the first component being a first metal component, the first and second outer surfaces facing one another and partially overlapping, and the adhesively bonded structure including an adhesive layer received between overlapping portions of the first and second outer surfaces. The method includes deforming the first outer surface of the first metal component along a first isolated path extending beside the first edge of the adhesive layer along at least a majority of a length of the first edge of the adhesive layer.

A method of modifying a 3D-printed polymer structure is provided. The method can include providing an initial 3D-printed polymer structure having at least one exposed surface; treating the exposed surface of the initial 3D-printed polymer structure with plasma to obtain a treated 3D-printed polymer structure having a treated surface; administering an adhesive to the treated surface of the treated 3D-printed polymer structure; and contacting a complementary 3D-printed polymer structure with the treated surface of the treated 3D-printed polymer structure to obtain a modified 3D-printed polymer structure.

A method of modifying a 3D-printed polymer structure is provided. The method can include providing an initial 3D-printed polymer structure having at least one exposed surface; treating the exposed surface of the initial 3D-printed polymer structure with plasma to obtain a treated 3D-printed polymer structure having a treated surface; administering an adhesive to the treated surface of the treated 3D-printed polymer structure; and contacting a complementary 3D-printed polymer structure with the treated surface of the treated 3D-printed polymer structure to obtain a modified 3D-printed polymer structure.

A method for curing a patch. The method includes generating the patch according to a negative of a scan of a scarf in a composite material. The method also includes pre-curing the patch.

A method for curing a patch. The method includes generating the patch according to a negative of a scan of a scarf in a composite material. The method also includes pre-curing the patch.