Verfahren zur Herstellung von Polyurethan-Schaumstoffen

The invention comprises a mixture of oxyalkylated polyhydroxy compounds, one of said polyhydroxy compounds being a polyphenol containing 2 or more hydroxyaryl groups attached to one or more alkylene radicals and another sucrose, said oxyalkylation being effected with an alkylene oxide of 2-4 carbon atoms until at least one molecule of alkylene oxide per hydroxyl group of sucrose and of the polyphenol has been introduced, and a composition obtained by mixing a partially oxyalkylated sucrose and a polyphenol, as defined above, and oxyalkylating the mixture with an alkylene oxide of 2-4 carbon atoms until the number of oxyalkyl groups introduced exceeds the number of hydroxy groups in the starting polyhydroxy compounds. Suitable polyphenols are those of the formula where R is alkylene of M.W. up to 700, R1 is C1- 12 alkyl or halogen, m is 1-3, n is 0-3, x is 1-3 and y is 0-6, one preferred class being the Novolac resins obtained by condensing polyhydroxy phenol and an aldehyde. Many other polyphenols are specified, including bisphenols and the products obtained by condensing a phenol with an unsaturated aldehyde, an hydroxy-aldehyde, a dialdehyde or petroleum resins. The partially oxyalkylated sucrose reactant may have the formula where R is hydrogen or C1- 2 alkyl, x is 0-6 and z+y is 3-8. The preferred products are those in which not more than 4 moles alkylene oxide per available hydroxy group are introduced. The novel products are used in the preparation of polyurethane foams (see Division C3). Table I describes a number of products.ALSO:The invention comprises a polyurethane made from a polyisocyanate and a polyol which is (a) a mixture of oxyalkylated polyhydroxy compounds, one of said polyhydroxy compounds being sucrose and the other a polyphenol containing 2 or more hydroxyaryl groups attached to 1 or more alkylene radicals, said oxyalkylation being such that at least one molecule of a C2- 4 alkylene oxide is introduced per hydroxy group of the sucrose and polyphenol, or (b) a composition obtained by oxyalkylating a mixture of a partially oxyalkylated sucrose and a polyphenol, as defined above, using a C2- 4 alkylene oxide until the number of oxyalkyl groups introduced exceeds the number of hydroxy groups in the initial mixture. Suitable polyphenols are those of the formula where R is alkylene of M.W. up to 700, R1 is C1- 12 alkyl or halogen, m is 1-3, n is 0-3, x is 1-3 and y is 0-6, one pref