Patent ID: 8491992

Claim:
A construction element, comprising a composite material, comprising: a first metallic outer layer (A); a second metallic outer layer (A′); a rigid polyurethane foam layer (C) disposed between the first metallic outer layer (A) and the second metallic outer layer (A′); and a compact polyurethane layer (B) disposed between the first metallic outer layer (A) and the second metallic outer layer (A′) which comprises a plurality of microcapsules, wherein a core of the plurality of the microcapsules comprises a latent-heat-accumulator material, wherein a wall of the plurality of the microcapsules comprises, in polymerized form, from 30 to 100% by weight of a first monomer (monomer I) selected from the group consisting of a C 1 -C 24 -alkyl ester of acrylic acid, a C 1 -C 24 -alkyl ester of methacrylic acid, acrylic acid, methacrylic acid, and maleic acid, from 0 to 70% by weight of a bi- or polyfunctional second monomer (monomer II) having no or little solubility in water, and from 0 to 40% by weight of a third monomer (monomer III), based in each case on a total weight of the first, second, third monomers (monomers I, II, and III), wherein the construction element is a sheet.