Layer structure for producing a hinge, in particular for producing multi-layered book covers

A hingeable layer structure comprising:

• layers arranged in a sequence of a/b/d/c/d′/b′, wherein only one of layer d and layer d′ is present or both d and layer d′ are present in the layer structure, wherein
• layer a is an outermost layer containing at least one thermoplastic elastomer comprising at least 50 wt % polyurethane, and layer a contacts layer b,
• layers b and b′ contains at least one material selected from the group consisting of a polymer, a metal, a textile, a paper, a synthetic paper, or a combination thereof, and layer b either (i) contacts layer d if layer d is present, or (ii) contacts layer c if layer d is not present,
• layer c contains at least one thermoplastic polyurethane which is formed at least in regions as a foam layer, and layer c either (i) contacts layer d′ if layer d′ is present, or (ii) contacts layer b′ if layer d′ is not present,
• layer(s) d and/or d′ contain(s) at least one thermoplastic polyurethane having a hardness of ≥60 Shore A to ≤95 Shore D according to DIN ISO 7619-1, wherein layer d, if present, contacts layer c and layer d′, if present, contacts layer b′, and
• layer b comprises a cutout of any desired form, wherein layer a, layer c, and layer(s) d and/or d′ extend across the cutout defining a hinge region.