Patent ID: 9598518
Date: 2017-03-21
CPC Classifications: B01J,B29B,B29C,B29K,C08F,C08K

Claim:
1. A method for continuous bulk polymerization of an acrylic pressure-sensitive adhesive, the method comprising: providing a planetary roller extruder having a plurality of planetary roller zones; introducing an alkyl acrylate monomer and one or more other vinylic monomers into the planetary roller extruder; introducing an initiator into the planetary roller extruder for initiation of a free-radical polymerization of the alkyl acrylate monomer and the one or more other vinylic monomers to form an acrylic polymer; maintaining the temperature of the free-radical polymerization in the planetary roller extruder below 240° C.; and discharging a portion of the acrylic polymer from the planetary roller extruder, and returning the portion of the acrylic polymer to one or more of the plurality of planetary roller zones.