ES372183A1 - A procedure for the preparation of an open cell flexible foam. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A procedure for the preparation of a flexible open-cell foam, consisting of reacting a polyether polyol or polyester polyol, with an average equivalent weight of at least 500, and 1-10 parts by weight of water per 100 parts of polyol with 0.7-1.3 equivalents of an aliphatic polyisocyanate for each equivalent of water plus polyol, the reaction being carried out between the water and the isocyanate group in the presence of at least one substituted guanidine of the formula **(See formula)** where R1, R2, R3 and R4 are independently substituted C1-C4 alkyl, where the substituent is at least one C1-C4 alkoxy, or one or two of the pairs R1-R2 and R3-R4 are bonded together to form a 5- to 7-membered ring consisting of carbon atoms and no more than 2 heteroatoms, including the guanidine nitrogen atom, from the group consisting of nitrogen, sulfur, and oxygen and X is phenyl or substituted phenyl in which the substituents are one or more C1-C12 alkyl or C1-C4 alkoxy groups; or X is an alkyl radical of the formula **(See formula)** where R5, R6 and R7 are independently hydrogen, C1-C4 alkyl or substituted C1-C4 alkyl wherein the substituents are phenyl, substituted phenyl, C1-C4 alkoxy, C6-C15 aryloxy, nitrile or carboalkoxy; or R7 may additionally be C5-C18 alkyl phenyl, substituted phenyl, or C1-C4 alkoxy, or one or two of the pairs R5-R6, R5-R7, and R6-R7 are bonded together to form a 5-7 membered ring consisting of carbon atoms and no more than one hetero atom from the group consisting of nitrogen, sulfur and oxygen. (Machine-translation by Google Translate, not legally binding)