| 摘要 |
<p>Particulate polyurethane polymers (micro-bits) are prepared by comminuting a flexible polyurethane foam in an inert fluid such as water. The cell structure of the polyurethane foam has been substantially destroyed so that the particulate material comprises predominantly tripodal particles the characteristics of which are such that the polyrethane micro-bits, when slurried in water and incorporated in a paper formulation, yield paper of improved tear and tensile strength properties. The micro-bits are useful to remove such contaminants as phenols from aqueous and gaseous streams. The nature of the micro-bits may be seen in Figure 2 of the accompanying drawings.</p> |
