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US 6,063,826 AGranted
Polyisocyanate based xerogels
AssigneeImperial Chemical Industries PLC
InventorsGuy Leon Jean Ghislain Biesmans, Andy Mertens, Els Kinnaes
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Abstract
Process for making polyisocyanate based xerogels by trimerisation of an organic polyisocyanate in an organic solvent in the presence of a (co)polymer containing an isocyanate-reactive group, gellation and drying of the obtained sol-gel.
Claims18
Method for preparing a polyisocyanate-based xerogel comprising the steps of
- a) mixing an organic polyisocyanate, an isocyanate trimerisastion catalyst and a (co)polymer containing at least one isocyanate reactive group in a suitable solvent,
- b) maintaining said mixture in a quiescent state for a sufficiently long period of time to form a polymeric gel, and
- c) drying the obtained gel, characterised in that said (co)polymer is derived from ethylenically unsaturated monomers or is obtained by condensation of aldehydes and/or ketones.
Dependencies are inferred from the claim text.