Basf Aktiengesellschaft

Eckhard Ropte

Bruno Sander

Rolf Steinberger

Kurt Scherling

Jenoe Kovacs

Heinz Berbner

Wolfgang Jarre

Joachim Kunde

Gerhard Mueller

Otmar Zipp

Hansjuergen Kessler

Uwe Hartwig

A process for the preparation of a hard foam containing urethane groups or containing urethane and isocyanurate groups involves reacting

Preparation of hard foams containing urethane groups or containing

The invention concerns a process for the manufacture of flame resistant flexible polyurethane foams by reacting a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates having a functionality greater than 2 containing 40 to 90 percent by weight diphenylmethane diisocyanate based on the total weight of said mixture; polyols, cyanic acid derivatives such as cyanamide, dicyandiamide, guanidine, biguanidine, melamine, cyanuric alkyl esterhydrazides and -amides as flame inhibitors, and blowing agents; as well as, possibly, chain extenders and other additives. The flexible polyurethane foams are suited for the familiar areas of applications, but especially as sound-insulation material for the construction industry.

Process for manufacture of flexible polyurethane foams with cyanic acid

Fibrids are prepared by introducing a solution of a polymer into a liquid precipitation medium while exposing it to shearing forces. A poly(amide-imide) resin solution is admixed with a solvent which is miscible with the resin solvent but which is a non-solvent for the resin itself.

Manufacture of fibrids from poly(amide-imide) resins

The manufacture of paper-like and textile-like sheet materials by the use of fibrids which have been obtained by dissolving poly(amide-imide) resins in an organic solvent, mixing the resulting solution with a liquid which is a non-solvent for the polymer and introducing the resulting solution into a liquid precipitation medium while exposing it to shearing forces.

Manufacture of paper-like and textile-like sheets

Growing community of inventors

Ludwigshafen, Germany

Eckhard Ropte