Patent ID: 8173719
Filing Date: 2012-05-08
Classification: C08G,C09K,Y10T

Abstract:
1. A water-impermeable flexible polyurethane foam obtained by: reacting a polyol component with at least one polyisocyanate component in the presence of a foaming agent; wherein: the polyol component comprises at least one hydrophobic polyol; the polyisocyanate component comprises at least 30 mol % of 2,4′-methylene-bis(phenylisocyanate) isomer (2,4′MDI); the foam has a compression force of less than or equal to 12 kPa for 50% compression; and a molar ratio of isocyanate functional groups to a total of alcohol functional groups and reactive functional groups (the index) is less than or equal to 0.85.