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US 5,990,184 AGranted
Polyisocyanate based aerogel
AssigneeImperial Chemical Industries PLC
InventorGuy Leon Jean Ghislain Biesmans
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Abstract
Process for making polyisocyanate based aerogels by trimerisation of an organic polyisocyanate in an organic solvent in the presence of a (co)polymer containing an isocyanate-reactive group, gellation and supercritically drying of the obtained sol-gel.
Claims18
Method for preparing an organic aerogel comprising the steps of
- a) mixing an organic polyisocyanate, a (co)polymer containing at least one isocyanate-reactive group and an isocyanate trimerisation catalyst in a solvent,
- b) maintaining said mixture in a quiescent state for a period of time until said mixture forms a polymeric gel, and
- c) supercritically drying the obtained gel,
- wherein said (co)polymer is derived from ethylenically unsaturated monomers or is obtained by condensation of aldehydes or ketones or mixtures of aldehydes and ketones.
1 more element
Dependencies are inferred from the claim text.