Bayer Aktiengesellschaft

Roland Gipp

Hanns P Muller

Jan Mazanek

Johannes Blahak

Erwin Muller

Kuno Wagner

Peter Haas

Rolf Dhein

Helmut-Martin Meier

Heinrich Heine

Wolfgang Oberkirch

Peter Seifert

Otto Berenstecher

Horst Renziehausen

Robert Zollner

Kuuno Wagner

Novel polyurethanes are prepared by reacting

Process for preparing polyurethanes from an organic diisocyanate ester

A process for the preparation of 4-hydroxyphenyl 4-hydroxy-benzoate by esterification of hydroquinone and p-hydroxybenzoic acid is described, wherein an esterification catalyst is used and wherein the reaction is carried out in a reaction medium in which the reactants are substantially dispersed. The use of the compound, accessible by the above process in high yield and good industrial purity, for the preparation of linear polycarbonates or copolycarbonates is furthermore claimed.

Process for the preparation of 4-hydroxyphenyl 4-hydroxybenzoate and the

The invention relates to new, liquid-crystalline diglycidyle compounds of optionally ring-substituted 4-hydroxyphenyl 4-hydroxybenzoates, a synthesis of p-epoxypropoxy-phenyl p-epoxy-propoxybenzoate, furthermore epoxy resin mixtures containing the new diglycidyle compounds, and the use of the new diglycidyl compounds and the epoxy resin mixtures thereof in curable mixtures.

Liquid-crystalline diglycidyl compounds, the preparation of these, and

A process is described for the preparation of polymeric networks having superstructures, resulting from the use of liquid-crystalline, (poly)functional units, characterized in that build-up into polymers is carried out by the polymerization, polyaddition or polycondensation process within the liquid-crystalline, preferably nematic, temperature range of the (poly)functional units, having a liquid-crystalline character, used for building up the networks. Polymeric networks which are accessible by this process, and the use thereof, are also claimed.

Process for the preparation of polymeric networks having

Novel, finely divided, redispersible dispersions of high melting polyesters in low melting polyhydroxyl compounds are disclosed. Disclosed also is a process for their preparation and their use as polyol components containing fillers in the production of cellular or non-cellular polyurethanes.

Dispersions of high melting polyesters in polyhydroxyl compounds, a

This invention relates to new high molecular weight polyurethanes which contain a very small amount of urethane and urea groups. These new synthetic resins are built up as block copolymers and contain relatively high molecular weight segments which are derived from high melting and low melting polyols and linked together through ester and/or urethane and/or urea groups.

Segmented polyurethane resins

Process for the preparation of new segmented polyurethane resins derived

Quaternary N-(2,3-epoxyalkyl)-ammonium compounds of the formula ##STR1## IN WHICH Y represents a sulphur atom, a CH.sub.2 group, a simple C-C bond or especially an oxygen atom,

Quaternary N-(2,3-epoxyalkyl)-ammonium compounds

A segmented thermoplastic elastomeric copolyester comprising alternating hard segments of polyalkylene terephthalate and soft segments of a polyester containing ether groups, the said soft segments resulting from a polyester having a molecular weight greater than 6000 and a process for the production of said copolyesters.

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Cologne, Germany

Roland Gipp