Bayer Aktiengesellschaft

Ulrich Leyrer

Pramod Gupta

Volker Eckhardt

Ralf Pakull

Hans R Kricheldorf

Hans-Joachim Sandhagen

Werner Betz

Martin Hoppe

Jurgen Engelhardt

High functionality, low viscosity, light colored sucrose-based polyethers are prepared by reacting a starter mixture containing i) approximately 100 parts by weight of sucrose, ii) from about 30 to about 1000 parts by weight of a low molecular weight, relatively high valency alcohol and/or an alkoxylation product of such an alcohol and iii) an alkali metal hydroxide which has been prepared at a temperature of from about 20.degree. to about 110.degree. C. with an alkylene oxide at a temperature of from about 90.degree. to about 130.degree. C. and at a pressure of from about 0.3 to about 4 bar excess nitrogen pressure. These polyether polyols are particularly useful for the production of polyurethanes, particularly rigid polyurethane foams.

Process for the production of low viscosity high functionality, light

The substituted polyheterocycles containing recurring structural units corresponding to the formula ##STR1## in which X is an oxygen atom, a sulfur atom or N-H, show good solubility in mixtures of methanesulfonic acid and methylene chloride or trifluoroacetic acid and methylene chloride. They may be used for the production of mixtures with thermoplastic polymers.

Stiff-chain polyheterocycles having improved solubility, a process for

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Leverkusen, Germany

Ulrich Leyrer