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US 9,382,375 B2Granted
Curable polyisocyanate composition
AssigneeHuntsman International LLC
InventorsChristian Esbelin, Hugo Verbeke, Hans Godelieve Guido Verbeke
Life of this patent
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Abstract
Stable polyisocyanate composition comprising a compound comprising a group having the structure —CO—NH—O— in such an amount that the ratio of the number of —CO—NH—CO— groups to the number of isocyanate groups is at most equal to 1. Curable composition comprising this polyisocyanate composition, lithium halide, urea and an epoxy resin.
Claims18
A curable composition for making a polyisocyanurate material by allowing the curable composition to react at elevated temperature above 50° C. comprising:
- a polyisocyanate composition comprising a compound comprising a group having the structure —CO—NH—CO— in such an amount that the ratio of the number of —CO—NH—CO— groups to the number of isocyanate groups is at most 1, and
- a lithium halide, and
- a urea compound, having an average molecular weight of 500-15000 and optionally comprising biuret groups, and
- an epoxy resin,
- wherein the number of moles of lithium halide per isocyanate equivalent ranges from 0.0001-0.04 and the number of urea+biuret equivalents per isocyanate equivalent ranges from 0.0001-0.4 and the number of epoxy equivalents per isocyanate equivalent ranges from 0.003-1;
- and wherein the curable composition is stable up to 40° C.
3 more elements
Dependencies are inferred from the claim text.