초록 ▼

In a process for producing rigid foams based on isocyanate, the blowing agent used is a mixture of at least one low-boiling hydrocarbon having from 3 to 7 carbon atoms, low molecular weight monohydric alcohols containing primary or secondary hydroxyl groups and having from 1 to 4 carbon atoms, and,

In a process for producing rigid foams based on isocyanate, the blowing agent used is a mixture of at least one low-boiling hydrocarbon having from 3 to 7 carbon atoms, low molecular weight monohydric alcohols containing primary or secondary hydroxyl groups and having from 1 to 4 carbon atoms, and, if desired, the carbon dioxide formed from water and isocyanate. The rigid foams can be used as insulation material.

대표청구항 ▼

A process for producing rigid foams based on isocyanate comprising reacting a) organic polyisocyanates, modified organic polyisocyanates or mixtures of organic and modified organic polyisocyanates with b) at least one compound containing at least two reactive hydrogen atoms and c) optionally chain e

A process for producing rigid foams based on isocyanate comprising reacting a) organic polyisocyanates, modified organic polyisocyanates or mixtures of organic and modified organic polyisocyanates with b) at least one compound containing at least two reactive hydrogen atoms and c) optionally chain extenders, crosslinkers, or mixtures of chain extenders and cross linkers, in the presence of d) blowing agents, and e) catalysts wherein the blowing agent (d) comprises a mixture of at least one low boiling hydrocarbon having from 3 to 7 carbon atoms and a low molecular weight monohydric alcohol containing a primary or secondary hydroxyl group and having from 1 to 4 carbon atoms.