Layered composite material comprising various pre-hardened resin layers
In a laminated composite comprising a support made of a thermoplastic polymer, an intermediate layer located thereon which is likewise made of a thermoplastic polymer and a heat-cured layer applied to the intermediate layer, a resin layer (a) having a degree of curing of at least 20% is additionally inserted between the support and the intermediate layer and a resin layer (c) having a degree of curing of at least 60% is inserted between the intermediate layer and the heat-cured layer.
1. A laminated composite comprising a support made of thermoplastic polypropylene, an intermediate layer located thereon which is made of a thermoplastic polymer and a heat-cured layer applied to the intermediate layer, wherein a resin layer (a) having a degree of curing of at least 20% is additionally inserted between the support and the intermediate layer, a resin layer (c) having a degree of curing of at least 60% is inserted between the intermediate layer and the heat-cured layer and a resin layer (b) located on the intermediate layer and having a degree of curing at least 20% is additionally inserted between the intermediate layer and the resin layer (c) having a degree of curing of at least 60% and an additional decorative layer is applied to this resin layer (b), and wherein the degree of curing of the individual resin layers (a), (b) and (c) increases from the supoort in the direction of the heat-cured layer.
2. A laminated composite as claimed in claim 1 , wherein the degree of curing of the resin layer (a) is at least 30%, the degree of curing of resin layer (b) is at least 40% and the degree of curing of the resin layer (c) is at least 80%.
3. A laminated composite as claimed in claim 1 , wherein the intermediate layer comprises a resin-impregnated nonwoven made of the thermoplastic.
4. A laminated composite as claimed in claim 1 , wherein the resin layezs (a) and (b) comprise a urea resin or a phenolic resin.
5. A laminated composite as claimed in claim 1 , wherein the resin layer (c) comprises a melamine resin or an acrylic resin.
6. A process for producing a laminated composite as claimed in claim 1 , which comprises providing the materials for the intermediate layer, the decorative layer and the heat-cured layer and for the resin layers (a), (b) and (c), in each case in the form of thin sheets and subsequently joining them to the support at from 150 to 300° C.
7. A process as claimed in claim 6 , wherein the individual resin layers (a), (b) and (c) are joined to support, the intermediate layer, the decorative layer and the beat-cured layer by injection molding.
8. A process as claimed in claim 6 , wherein the individual resin layers (a), (b) and (c) are joined to the support, the intermediate layer, the decorative layer and the heat-cured layer by extrusion.
9. A process as claimed in claim 6 , wherein the individual resin layers (a), (b) and (c) are joined to the support, the intermediate layer, the decorative layer and the heat-cured layer by hot pressing.
10. A process as claimed in claim 6 , wherein the individual resin layers (a), (b) and (c) are joined to the support, the intermediate layer, the decorative layer and the heat-cured layer by welding.