Production of polyurethane foams

The invention describes a composition for producing rigid polyurethane foams, comprising at least one isocyanate component, a polyol component, optionally a catalyst that catalyzes the formation of urethane or isocyanurate bonds, characterized in that the composition has hydrocarbons having 3, 4 or 5 carbon atoms as blowing agent; a hydrofluorocarbon; a hydrofluoroolefin (HFO); a hydrohaloolefin; an oxygen-containing blowing agent and/or a hydrochlorohydrocarbon, and further comprising an acrylate and/or methacrylate copolymer as a foam stabilizer. 本发明描述了用于生产硬质聚氨酯泡沫的组合物，其包含至少一种异氰酸酯组分、多元醇组分、任选存在的催化氨基甲酸酯或异氰脲酸酯键的形成的催化剂，其特征在于所述组合物具有作为发泡剂的具有3、4或5个碳原子的烃；氢氟烃；氢氟烯烃(HFO)；氢卤烯烃；含氧发泡剂和/或氢氯烃，并且还包含作为泡沫稳定剂的丙烯酸酯和/或甲基丙烯酸酯共聚物。