| abstract |
Procedure for the preparation of graft polymers containing rubber by emulsion polymerization using a redox initiator system, characterized in that i) before the start of the graft polymerization reaction, the rubber latex is adjusted to a pH value of 9 to 11, ii) the resin-forming vinyl graft monomers are dosed into the rubber latex (with a glass transition temperature F 0 ° C), iii) the redox initiator components are added in amounts of 0.1 to 2 , 5% by weight (with respect to the dosed monomers) and iv) the pH value is maintained throughout the graft polymerization reaction between 11.0 and 8.8 and the pH value remains constant during the reaction in the context of an oscillation width of ± 0.5 units and a temperature difference between the start and the end of the reaction of at least 10 ° C is met. |