| 摘要 |
Vinyl chloride is polymerized alone or with vinyl acetate in aqueous medium in the presence of at least 0,02% by weight of the monomer or monomers of a cetyl quaternary pyridinium compound. Any of the usual catalysts and polymerization aids may be used. In the example, the catalyst was hydrogen peroxide and a silicone antifoam agent was used. Cetyl pyridinium bromide was the emulsifying agent for a copolymer of vinyl chloride and vinyl acetate. The mixed monomers were fed in at constant pressure and the pyridinium compound added dropwise. When polymerization was finished further pyridinium compound was added. The products have useful antistatic properties and may be made into gramophone records. |
