Silicone stabilizers for flame-retarded rigid polyurethane or polyisocyanurate foams

摘要: The invention relates to a process for producing rigid polyurethane or polyisocyanurate foams by reacting an isocyanate with polyol in the presence of urethane and/or isocyanurate catalysts, water, optionally further blowing agents, flame retardants and additives (e.g. fillers, emulsifiers, purely organic stabilizers surfactants, viscosity reducers, dyes, antioxidants, UV stabilizers, antistatics) using foam general formula (I) R-Si(CH3)2-O-[-Si(CH3)2-O-]n-[-Si(CH3)R- O-]m-Si(CH3)2-R, where R=-(CH2)x-O-(CH2-CHR'-O )y- R".