Patent ID: 6852418

Claim:
A composite structure with at least one polyurethane layer, a support layer, and an optional adhesive layer placed between these layers, wherein at least one polyurethane layer contains a polyurethane having the formula (I) wherein O—R 1 —O is the radical of a polyol selected from the group consisting of polyether polyols and a polyester polyols, wherein the polyether polyols and polyester polyols have hydroxyl functional end groups selected from the group consisting of primary and secondary hydroxyl functional end groups and in which the primary and secondary hydroxyl functional groups of the polyols have a ratio of between approximately 2:1 and 1:6, wherein R 1 and R 2 independently represent an organic radical which includes aliphatic, cyclo-aliphatic, aromatic and/or heterocyclic groups and n is an integer number between 1 and 50,000 wherein the polyurethane layer(s) which contain(s) the polyurethane according to formula (1) have/has a content of volatile organic chemicals (VOC) below approximately 100 ppm and wherein the composite structure has a grain.