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US 9,481,776 B2Granted
Foams of high thermal stability
AssigneeCovestro Deutschland AG
InventorsDirk Wegener, Stephan Reiter, Harald Rasselnberg, Marcel Schornstein, Hans-Detlef Arntz, Dirk Brüning
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Abstract
The invention relates to foams of high thermal stability, to the production thereof from organic polyisocyanates and polyepoxides, and to the use of the foams.
Claims11
A high temperature resistant foam obtained by reaction of
- a) at least one organic polyisocyanate with
- b) at least one organic compound having at least two epoxide groups, in such an amount as corresponds to an equivalent ratio of 1.2:1 to 500:1 for isocyanate groups to epoxide groups,
- e) optionally in the presence of auxiliary and additive agents,
- wherein the reaction is carried out in the presence of formic acid as a blowing agent and optionally further chemical and/or physical blowing agents T) and an isocyanate/epoxide reaction catalyst f).
1 more element
A process for producing the high temperature resistant foam comprising:
- reacting
- a) at least one organic polyisocyanate with
- b) at least one organic compound having at least two epoxide groups, in such an amount as corresponds to an equivalent ratio of 1.2:1 to 500:1 for isocyanate groups to epoxide groups,
- e) optionally in the presence of auxiliary and additive agents,
- wherein the reaction is carried out in the presence of formic acid as blowing agent and optionally further chemical and/or physical blowing agents T) and an isocyanate/epoxide reaction catalyst f) with foaming into a foamed state.
2 more elements
Dependencies are inferred from the claim text.