Patent ID: 6864335
Filing Date: 2005-03-08
Classification: C08F,C08L,C09J

Abstract:
1. A process for preparing solid polymeric pressure sensitive adhesive microspheres comprising: (a) contacting a polymerizable aqueous emulsion of at least one non-ionic monomer of an alkyl acrylate or alkyl methacrylate ester of a non-tertiary alcohol and at least one ionic monomer copolymerizable with said non-ionic monomer and at least one non-free radically polymerizable acid, wherein said non-free radically polymerizable acid is contacted with said (b) polymerizable aqueous emulsion prior to achieving about 95% conversion of said non-ionic monomer; and polymerizing the emulsion to form an aqueous suspension of said solid polymeric pressure sensitive adhesive microspheres; wherein said non-free radically polymerizable acid is sulfuric acid.