Process for producing polymer-functionalized filler particles
AssigneeContinental Reifen Deutschland GmbH
InventorsKatharina Herzog, Phillip Vana, Lena Mueller, Bjoern Springer, Carla Recker
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Abstract
A process for producing polymer-functionalized filler particles and polymer-functionalized filler particles obtained by this process. The polymer-functionalized filler particles are used as additives for rubber mixtures. The polymers for functionalizing the filler particles are obtained in-situ starting from filler particles having a surface-bound RAFT agent. The binding of silyl-bearing RAFT agents and of Diels-Alder RAFT agents occurs via the R-group and the subsequent RAFT polymerization proceeds via a reactive site of the RAFT agent.
Claims9
A process for producing polymer-functionalized filler particles comprising:
- binding a control agent for a controlled free-radical polymerization of monomers on a surface of a filler particle;
- the control agent containing an R-group;
- the R-group containing an R1-group selected from the group consisting of a coupleable silyl group and a Diels-Alder-reactive functionality;
- the control agent further containing a reactive site for the addition of monomers;
- wherein the R1-group of the control agent becomes bound to the surface of the filler particle;
- and,
- performing the controlled free-radical polymerization of the monomers via the reactive site of the control agent bound to the filler particle to prepare a surface-bound block polymer and a second block polymer bound to the surface-bound block polymer;
- wherein the surface-bound block polymer is selected from the group consisting of a polybutadiene block and a butadiene copolymer block.
Dependencies are inferred from the claim text.