POLYURETHANE AND/OR POLYUREA DISPERSIONS IN ACTIVE HYDROGEN-CONTAINING COMPOSITIONS

摘要

Polyurethane and/or polyurea dispersions are prepared by reacting certain coreactants with a poly- isocyanate in the presence of a preformed polyurethane and/or polyurea dispersion. The resulting products are especially useful to prepare flexible polyurethane foams which exhibit low shrinkage. In addition, polyurethane and/or polyurea dispersions having a bimodal particle size distribution are disclosed.