Patent ID: 9487598
Filing Date: 2016-11-08
CPC Classification: A61K,A61Q,C08F,C09D,C09J,C09K

Claim Text:
1. A process for preparing a polymer, comprising a step (E1) of dispersed-phase polymerization in the presence of a reactive stabilizer, wherein the following are placed in contact in an aqueous phase: at least one ethylenically unsaturated monomer; a redox initiator comprising tert-butyl hydroperoxide as oxidizing agent, combined with a reducing agent selected from the group consisting of ascorbic acid and sodium sulfite; and a reactive stabilizer comprising a polymer chain including N-(vinyllactam) monomer units and a thiocarbonylthio group —S(C═S)—; wherein step (E1) is performed in the absence of surfactants.