Bayer Aktiengesellschaft

Other

Gunter Oertel

Josef Pedain

Klaus Konig

Kuno Wagner

Bernd Quiring

Hans J Meiners

Hans-Jurgen Muller

Jurgen Ick

Gunter Hauptmann

Richard Kopp

Marianne Dislich

Eckehard Weigand

Rolf Wiedermann

Hans D Golitz, Deceased

The present invention is directed to the production of free-rise polyurethane foams using sterically hindered diamines of the formula (e) ##STR1## and/or ##STR2## in which R.sup.1 and R.sup.2 may be the same or different and represent C.sub.1 -C.sub.4 -alkyl and

Process for the production of polyurethane foams using sterically

The instant invention is directed to a process for the production of cold setting, flexible foams which contain urethane groups by the reaction of polyethers with a molecular weight of 400 to 10,000 which contain at least two hydroxyl groups and in which at least 10% by weight of the hydroxyl groups are primary hydroxyl groups, with a mixture of diphenyl methane diisocyanates and oligomeric polyphenyl-polymethylene polyisocyanates in the presence of blowing agents and optionally in the presence of catalysts and other foaming aids, the improvement wherein the mixture of diphenyl methane diisocyanates and polyphenyl-polymethylene polyisocyanate mixtures is substantially free of carbodiimide groups, has an isocyanate content greater than 30%, and contains from 60 to 90% by weight of 4,4' diphenyl methane diisocyanate and from 3 to 30% by weight of 2,4' diphenyl methane diisocyanate.

Process for the production of cold setting foams which contain urethane

The instant invention is directed to a process of preparing a silyl substituted urea derivative comprising reacting an isocyanate of the formula ##STR1## wherein R represents a C.sub.1 -C.sub.18 alkyl group, a C.sub.4 -C.sub.14 cycloalkyl group or a phenyl group,

Process for the preparation of silyl substituted urea derivatives

The amount of unreacted 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane (IPDI) mixed with an adduct of IPDI and a polyhydroxyl compound having two or three hydroxyl groups in a solution thereof in a conventional lacquer solvent is reduced by mixing the solution with from 0.1 to 10 mols monohydric alcohol per mol of unreacted IPDI in the solution to provide a polyisocyanate solution adapted for use in making coating materials such as lacquers.

Organic polyisocyanate solutions adapted for use in laquer

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Leverkusen, Germany

Gunter Oertel