Bayer Aktiengesellschaft

Roland Nast

Pramod Gupta

Klaus Konig

Hanns P Muller

Jan Mazanek

Walter Schafer

Manfred Dietrich

Manfred Kapps

Hartmut Hetzel

Wolfgang Oberkirch

Franz-Moritz Richter

Erwin Windemuth

Karl-Josef Kraft

Heinrich Bormann

Ulrich Brocker

Dieter Maassen

Helmut Piechota

Herbert Echterhof

Oligoesters having hydroxyl groups and an OH number of from 200 to 600 mg KOH/g are made by reacting a cyclic dicarboxylic acid anhydride in which no halogen is present with a polyfunctional alcohol or dialkanolamine in a molar ratio of from 1:0.5 to 1:1.5 at a temperature of from 50.degree. to 150.degree. C. to form the corresponding dicarboxylic acid semiester and/or semiamide. This semiester and/or semiamide is then alkoxylated with ethylene oxide and/or propylene oxide in the presence of a catalyst at 80.degree. to 150.degree. C. The equivalent ratio of acid groups to alkylene oxide groups is from 1:0.8 to 1:1.7. The catalysts are reaction products of alkoxides with at least 3 C-atoms with ammonia, piperidine, piperazine and/or C.sub.2 -C.sub.6 aliphatic, polyamines, preferably diamines in which all of the NH-functional groups have been alkoxylated. The resultant oligoester may then be reacted with a polyisocyanate optionally in the presence of known additives, such as blowing agents and catalysts.

Process for the production of oligoesters containing hydroxy groups and

New alkoxylated aminopolyethers of the formula ##STR1## in which Q denotes a polyalkylene oxide radical which has a valency corresponding to n, which has a structure derived from an aminopolyether by removal of the terminal amino groups and which has an average molecular weight of 82 to 30,000,

Alkoxylated aminopolyethers, a process for their preparation

A process for removing alkali material from a polyether polyol. From 1-20 wt. % water and 0-30 wt. % inert organic solvent are added to an alkaline polyether polyol. The resultant emulsion is maintained at a temperature of at least 70.degree. C. for a period of at least 30 minutes with little or no stirring to effect separation of the emulsion into an organic and an aqueous phase. The aqueous phase is then separated from the organic phase and the organic phase is treated by known methods to remove residual alkali material.

Process for removing alkaline catalysts from polyether polyols

Soluble polyisocyanates of isocyanurate structure are produced by heating polyisocyanates in the presence of Mannich bases and carbamic acid esters of isocyanates and secondary alcohols. When such a process is used, the polymerization reactions begin without incubation times and the catalysts need not be inactivated by introducing additives because they deactivate themselves at high temperatures.

Process for the production of polyisocyanates of isocyanurate structure

A process for the preparation of saccharose polyethers which makes saccharose polyethers with a high functionality easily available. This is accomplished by subjecting mixtures of saccharose, a small quantity of water, a small quantity of a low molecular weight polyol, monoamine or polyamine or any combination of these to an alkoxylation reaction the reaction being carried out in suspension in aromatic hydrocarbon solvents and in the presence of alkali metal hydroxide catalysts.

Process for the preparation of saccharose-hydroxy alkyl ethers

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Roland Nast