| 摘要 |
<p>A process for the aqueous suspension polymerization of vinyl chloride or a mixture of vinyl chloride and other vinylic monomers(s) to produce a porous resin, having the step of polymerizing vinyl chloride or said mixture at a polymerization temperature in the presence of a dispersant composition, wherein said dispersant composition comprises a polymeric emulsifier which: a) has both hydrophilic functional groups and hydrophobic functional groups in a ratio ranging from 30:70 to 99:1; b) has a molecular weight of at least 100,000; and c) displays a cloud point above said polymerization temperature during the polymerization step.</p> |
