Patent ID: 7662469

Claim:
A composite element, comprising: a rigid polyurethane foam inner layer and two outer layers, wherein at least one outer layer is a self-supporting particle board comprising a mixture of microcapsules, an adhesive resin, and at least one of lignocellulose particles and lignocellulose fibers, wherein the lignocellulose particles or the lignocellulose fibers are present in an amount of 50 to 93% by weight based on the weight of the particle board, wherein said microcapsules comprise a polymer as capsule wall and a capsule core comprising mainly a latent-heat-accumulator material, said latent heat-accumulator material being a lipophilic substance with a solid/liquid phase transition in the temperature range from −20 to 120° C., and wherein the microcapsules are uniformly dispersed in the particle board in an amount of from 2 to 30% by weight based on the weight of the particle board.