| 摘要 |
Vinyl chloride or a mixture of vinyl monomers containing vinyl chloride as its main component, and an aqueous medium containing a protective colloidal substance and an anionic surface active agent are subjected to an initial stirring, in the presence of an oil-soluble catalyst. Before the rate degree of conversion reaches 30 percent, an inorganic polyvalent metal salt and/or an amine hydrochloride is added to the polymerization system. The anionic surface active agent is thereby rendered water-insoluble. The polymerization is then completed. A polymer having uniform particle size distribution, superior porosity and a high rate of plasticizer absorption is produced.
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