| 摘要 |
<p>ANTI-LUMPING COATING FOR POLYSTYRENE BEADS A complex is formed by the reaction of an aluminum salt such as aluminum sulfate with a high molecular weight(for example, above 60,000 M.W.) collagen. Collagenaluminum complex is dispersed in water and serves as suspension agent for suspending polystyrene beads during imprenation of a blowing agent, even when the concentration of the suspending agent is of the magnitude of 0.05% by weight of the beads. The aqueous system is drained from impregnated expandable beads, which are washed, but which retain adherent deposits of said collagen-aluminum complex in measurable amounts. The dried coated beads have minimized propensity toward lumping when pre-expanded. The prepuffed particles can pass tests concerned with resistance toward static electrical phenonomen better than corresponding prepuffed particles lacking such deposit of collagen-aluminum complex. 1.</p> |
