| 摘要 |
Disclosed is an emulsion polymerization process for the preparation of polybutadiene grafted with styrene and acrylonitrile monomers, having a very low end content or unreacted residual monomers, thereby eliminating the necessity of a subsequent stripping of the obtained product to remove the residual monomers that are known to have a negative impact on the thermal properties of the product and on the appearence of the subsequently manufactured article. In accordance with this process, the conversion of the graft monomers is increased from the values of 92 to 94% usually obtained, to values very close to 98%, by carrying out a suplemental redox-type reaction in the latter stages of the graft polymerization process, in the presence of an additional aliquot of acrylonitrile and of catalytic system. |
