Flexible open-cell polyurethane foam
AssigneeBASF SE
InventorsDuane A. Heyman, Theodore M. Smiecinski, Donald C. Mente
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Abstract
A flexible open-cell polyurethane is described that is the reaction product of a mixture comprising (a) a polyisocyanate component comprising monomeric or polymeric MDI, and (b) a polyol component having at least 50% of its 0H functional groups as secondary OH groups.
Claims20
A method of preparing a flexible open-cell polyurethane foam comprising the steps of
- (a) mixing
- (1) a polyisocyanate component comprising monomeric or polymeric MDI, and
- (2) a polyol component having at least 50% of its OH functional groups as secondary OH groups to form a polyurethane reaction mixture and filling a dispensing trough having an overflow weir with said polyurethane reaction mixture,
- (b) causing the polyurethane mixture to flow across the overflow weir, thereby applying the polyurethane reaction mixture onto a moving substrate to form a polyurethane bun, and
- (c) removing the polyurethane bun from the substrate.
A method of preparing a flexible open-cell polyurethane foam according to claim 22 wherein the polyol component has an equivalent weight of from 700 to 2500.
A method of preparing a flexible open-cell polyurethane foam according to claim 24 wherein the polyol component has an equivalent weight of 1000 to 2000.
Dependencies are inferred from the claim text.