Patent ID: 8188156

Claim:
A polyurethane foam produced by foaming a foaming composition prepared from a polyol composition comprising: an aromatic polyester polyol having a hydroxyl value of 300 to 500 mg KOH/g and an average functionality of 2.0 to 2.5; a medium-chain polyether polyol comprising oxyalkylene units wherein the oxyalkylene units consist of polyoxypropylene units and having a hydroxyl value of 100 to 250 mg KOH/g and an average functionality of 2.0 to 4.0; and a long-chain polyether polyol having a hydroxyl value of 15 to 40 mg KOH/g and an average functionality of 2.0 to 4.0, mainly made of a polyoxypropylene unit having an oxyethylene content of 14% by weight or less, a polyisocyanate, a catalyst, a blowing agent, and a foam stabilizer, wherein the polyurethane foam produced has an air flow of at least 0.3 cm 3 ·cm −2 ·s −1 .