Patent ID: 8535572

Claim:
A polyurethane gel producible by conversion of a polyurethane system wherein; (A1) one or more polyether alcohols which have been prepared predominantly from propylene oxide added onto a starter molecule of hydroxyl functionality from 2 to 4 and have a hydroxyl number of 28 to 90 mg KOH/g, (A2) one or more polyether alcohols which have been prepared predominantly from propylene oxide added onto a starter molecule of hydroxyl functionality from 2 to 4 and have a hydroxyl number of 240 to 850 mg KOH/g, (B1) one or more diisocyanates, (B2) one or more triisocyanates which have preferably been prepared by trimerization of diisocyanates, (A3) at least one additive which fulfills a given function and (A4) at least one additive of montmorillonite type sheet silicates having a particle size in the range from 1 to 650 nm in the presence of one or more catalysts (A5) for polyurethane formation, wherein the polyether alcohol (A1) present is an oligourea-containing long-chain polyether alcohol in which the oligoureas are obtained by depolymerization of flexible polyurethane slabstock foams by solvolysis with a mixture of at least one glycols and at least one secondary aliphatic amine, in an amount of 0.1 to 25% by weight, and has a particle diameter of 1 to 1000 μm, or with a mixture of at least two glycols and at least one secondary aliphatic amine, in an amount of 0.1 to 15% by weight, and has a particle diameter of 1 to 1000 nm.