| abstract |
Fiber-containing polyurethane foams having improved compression properties, especially at deformations of greater than 50%, are obtained by incorporating in the foam-forming composition from 0.1 to 10% by weight, based on the weight of finished foam, of polyolefin fibers, e.g., polyethylene or polypropylene fibers, that have been treated to provide them with functional groups that are reactive with isocyanates. The reactive fibers may be obtained by fixing to the fiber surface or incorporating in the fiber polyfunctional compounds, e.g., starch, methylcellulose, carboxy methylcellulose, saccharin, polyglycols, polyvinyl alcohol, hydroxyl-group-containing block copolymers, completely saponified copolymers of ethylene and vinylacetate and oxidation products of a polyolefin. |