Patent ID: 11970599
Assignee: TRINSEO EUROPE GMBH
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 1:
2. The process of claim 1 comprising contacting the acid polymer core particles with the first layer of a shell around the polymeric acid core particles with one or more of one or more hydrophobic ethylenically unsaturated monomers, one or more hydrophilic ethylenically unsaturated monomers containing acid functionality and one or more nonionic hydrophilic ethylenically unsaturated monomers, in the presence of the emulsifier and the one or more polymerization initiators in water, wherein the concentration of the one or more hydrophilic ethylenically unsaturated monomers containing acid functionality in the mixture is less than the concentration used to form the first layer of the shell under conditions such that a second layer of the shell is formed about the first layer of the shell around the polymeric acid core particles before forming the outer layer.