Abstract: The invention relates to the use of compounds of the general formula (VII) as stabilizers in the preparation of polyurethane foams.

Abstract: The invention relates to a process for producing rigid polyurethane or polyisocyanurate foams by reacting an isocyanate with a polyol in the presence of urethane and/or isocyanurate catalysts, water, optionally further blowing agents, optionally flame retardants and optionally further additives (e.g. fillers, emulsifiers, purely organic stabilizers and surfactants, viscosity reducers, dyes, antioxidants, UV stabilizers, antistatics) using foam stabilizers of the 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?.

Abstract: The invention relates to a trimerization catalyst system comprising at least 50% by weight of potassium octoate and a hydroxy-group-free and amino-group-free solvent which, under the reaction conditions, is inert toward the isocyanates used, to its use for the trimerization of isocyanates to give isocyanurates and/or polyisocyanurates, and to a process for production of PIR foams using the inventive trimerization catalyst system and PIR foams.

Abstract: The invention relates to the use of compounds of the general formula (VII) in which R1, R2, R3, R4 and R5 are identical or different radicals selected from linear or branched, saturated, monounsaturated or polyunsaturated alkyl, aryl, alkylaryl or arylalkyl radicals having 1 to 20, in particular 1 to 10, carbon atoms, haloalkyl groups having 1 to 20 carbon atoms, siloxy groups and triorganosiloxy groups, in particular where each of the organo moieties independently having 1 to 8 carbon atoms or is phenyl; R6 is at least one radical selected from the group consisting of CH2—CH2—(CH2)a-A or CH?CH—(CH2)a-A, where a is an integer between 0 and 10; and A is a radical which is selected from polyoxyalkylene radicals or linear, branched or cyclic, saturated, monounsaturated or polyunsaturated alkyl, aryl, alkylaryl or arylalkyl radicals having 1 to 100, in particular 1 to 50, carbon atoms, which optionally contain hetero atoms; Z is a triorganosilyl radical, in particular where each of the organo moieties ind

Abstract: The invention relates to the use of cyclic organic carbonates as additives in formulations for the production of polyurethane foams.