SUBSTANTIALLY CLOSED-CELL RIGID FOAMS CONTAINING URETHANE, UREA AND BIURET GROUPS AND A PROCESS FOR THEIR PRODUCTION

Rigid substantially closed cell foams are made by reacting an organic isocyanate with a mixture of high molecular weight polyols in the presence o f water, a catalyst and other optional materials such as chain extenders, crosslinking agents and flameproofing agents. The reactants are used in quantit...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	WELTE, RAINER, SCHOLL, HANS-JOACHIM
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	Rigid substantially closed cell foams are made by reacting an organic isocyanate with a mixture of high molecular weight polyols in the presence o f water, a catalyst and other optional materials such as chain extenders, crosslinking agents and flameproofing agents. The reactants are used in quantities such that the isocyanate to hydroxyl group index is from about 90 to about 150. The mixture of high molecular weight polyols is composed of (1) a polyester having at least two hydroxyl groups and OH number greater than 150 and/or a polyether having at least two hydroxyl groups and an OH number greater than 200 and (2) a polyether having at least two hydroxyl groups and an OH number below 100. The foams produced in accordance with this process are useful as insulating materials and as structural reinforcing materials.