Open-celled rigid foams based on isocyanate

US5880168A · kind A · utility

Assignee

• BASF SE

Inventors

• Marion Heinz · Bernsdorf, DE
• Werner Wiegmann · Rahden, DE
• Udo Rotermund · Ortrand, DE
• Anja Biedermann · Senftenberg - Zły Komorow, DE
• Michael Reichelt · Ruhland, DE

Key dates

• Filing date: Sep 24, 1998
• Grant date: Mar 9, 1999
• Expiry date: Sep 24, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F25D2201/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a process for producing open-celled rigid foams by reacting a) polyisocyanates with b) compounds containing hydrogen atoms which are reactive toward isocyanates, in the presence of c) water, d) if desired, organic compounds acting as physical blowing agents, e) catalysts, auxiliaries and/or additives, the compounds containing reactive hydrogen atoms used are substances having the structure I: ##STR1## where m is 0-15 PA0 n is 0-1 PA0 o is 0-15 PA0 p is 0-1 PA0 q is 0-15 PA0 r is 0-1 PA0 s is 0-15 PA0 t is 0-1 PA0 u is 0-10 PA0 v is 0-15 PA0 x is 1-5 PA0 y is 1-4 or mixtures of 1-3 where r+n.noteq.0 PA0 z is 0-3 PA0 z.sub.i is 0.1-3 R.sub.1 is an aliphatic structure without OH groups based on the structure of polyhydric alcohols, preferably ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol and dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,3-butanediol, trimethylolpropane, trimethylolethane, glycerol, pentaerythritol, where these substances can also be used in the esterification as any mixture among one another and R.sub.1 can therefore also be a mixture of the corresponding structures, R.sub.2 is the radical of a polycarboxylic…