ES422476A1 - Polyether urethane foams and polysiloxane fluids thereof - Google Patents

Abstract

A process for producing high elasticity polyether-urethane foams, said process comprising foaming and reacting a mixture comprising: (I) an organic polyol selected from the group consisting of: (A) a polyether-triol containing at least 40 mole percent of primary hydroxyl groups and having a molecular weight of from about 2,000 to about 8,000 and (B) a mixture of said polyether triol and another polyether having a mixture of at least two hydroxyl groups, said polyether triol ascending of said mixture to at least 40 weight percent of the total polyol content; (II) an organic polyisocyanate, said organic polyol and said polyisocyanate being present in the mixture in a major amount and in the relative amount required to produce the urethane; (III) a blowing agent in a secondary amount sufficient to foam the reaction mixture; (IV) a catalytic amount of catalyst for the production of urethane and (V) a cyanoalcohyl modified siloxane fluid having the average formula: (X) zR3-zSiO (R2SiO) x [(X) (R) SiO] y3iR3-zXz where x has a value from 1 to 6 inclusive; y has a value from 0 to 6 inclusive; z has a value from 0 to 1 inclusive; R is a lower alcohol or phenyl radical; and X is a cyanoalkyl radical of the formula - (O) nR'CN where n has a value of 0 or 1 and R'is an alcoholic radical having 2 to 4 carbon atoms; said siloxane containing at least one of said cyanoalcohyl radicals and having an average molecular weight in the range of about 400 to about 1500, in an amount sufficient to stabilize the foam against voids and shrinkage. (Machine-translation by Google Translate, not legally binding)