Back to results
US 6,433,032 B1Granted
Process for rigid polyurethane foams
AssigneeImperial Chemical Industries PLC
InventorAlan James Hamilton
Life of this patent
Estimating the term…
Abstract
Process for the preparation of open celled rigid polyurethane or urethane-modified polyisocyanurate foams by reaction of a polyfunctional isocyanate-reactive composition with a polyisocyanate composition comprising a prepolymer of NCO-value 21-30% based on a high molecular weight oxyethylene-containing polyol.
Claims14
Process for the preparation of an open-celled rigid polyurethane or urethane-modified polyisocyanurate foam comprising:
- reacting a polyisocyanate composition with a polyfunctional isocyanate-reactive composition under foam-forming conditions,
- wherein the polyisocyanate composition has a free NCO-value of 21 to 30% by weight and comprises the reaction product of
- a stoichiometric excess of an organic polyisocyanate and
- an isocyanate-reactive material comprising a polyether polyol having a molecular weight between 1000 and 10000 and an average nominal hydroxyl functionality of from 2 to 6 and containing from 10 to 50% by weight of oxyethylene units.
1 more element
Dependencies are inferred from the claim text.