Process for the production of polyurethane foam resins

Abstract

Abstract A PROCESS FOR THE PRODUCTION OF POLYURETHANE FOAM RESINS FROM POLYISOCYANATES, POLYETHERS WHICH CONTAIN HYDROXYL GROUPS, WATER AND OPTIONALLY OTHER BLOWING AGENTS AND OPTIONALLY FLAME RETARDING AGENTS, EMULSIFIERS, ACTIVATORS AND OTHER ADDITIVES IS PROVIDED WHICH IS CHARACTERIZED IN THAT THE POLYISOCYANATES USED ARE 20% TO 85% SOLUTIONS IN LIQUID MONOMERIC POLYISOCYANATES(WHICH ARE FREE FROM URETHANE GROUPS OR BIURET GROUPS) OF URETHANE-CONTAINING POLYISOCYANATES HAVING MOLECULAR WEIGHTS OF ABOUT 410 TO 3000 OR OF BIURET-CONTAINING POLYISOCYANATES OF THE GENERAL FORMULA: OCN-R-N(-CO-N(-X)-R-NCO)2 IN WHICH R REPRESENTS A DIVALENT ALIPHATIC, ARALIPHATIC, CYCLOALIPHATIC OR AROMATIC RADICAL AND X REPRESENTS HYDROGEN OR THE GROUP: X = -(CO-N(-R-NCO))N-H (N REPRESENTS AN INTEGER OF FROM 0 TO 5), AND THE POLYETHERS USED ARE MIXTURES OF POLYETHERS HAVING AN ALKYLENE OXIDE CONTENT OF FROM ABOUT 65% TO ABOUT 100% BY WEIGHT AND PREFERABLY 100% BY WEIGHT OF ETHYLENE OXIDE, THE POLYETHER MIXTURES CONTAINING FROM ABOUT 25% TO ABOUT 75% NBY WEIGHT, AND PREFERABLY 40% TO 60% BY WEIGHT OF DIFUNCTIONAL AND/OR TRIFUNCTIONAL POLYETHERS AND FROM ABOUT 75% TO ABOUT 25% BY WEIGHT, PREFERABLTY 60% TO 40% BY WEIGHT, OF POLYETHERS HAVING A FUNCTIONALITY OF 4 TO 8. THIS INVENTION ALSO CONTEMPLATES THE USE OF AN ADDITIONAL POLYISOCYANATE WHICH CONTAINS URETHANE GROUPS AND HAS AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 410 TO 3000 IN LIQUID MONOMERIC POLYISOCYANATES WHICH ARE FREE FROM BIURET GROUPS.

Inventors

• 👤 W Dietrich
• 👤 D Maaben
• 👤 H Conrad
• 👤 K Uhlig
• 👤 K Wagner
• 👤 H Bormann
• 👤 H Piechota

Bibliographic Details