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

Claim 12:
13. The process according to claim 1, wherein the product formed is a structure comprising the shell having two or three layers surrounding a void, wherein the first shell layer comprises one or more polymers of the one or more hydrophobic ethylenically unsaturated monomers and optionally, one or more hydrophilic ethylenically unsaturated monomers containing acid functionality and/or one or more nonionic hydrophilic ethylenically unsaturated monomers; the optional second shell layer comprises one or more polymers of, the one or more hydrophobic ethylenically unsaturated monomers and, optionally, the one or more hydrophilic ethylenically unsaturated monomers containing acid functionality and/or one or more nonionic hydrophilic ethylenically unsaturated monomers; the second layer having a lower percentage of the one or more hydrophilic ethylenically unsaturated monomers containing acid functionality than the first layer; and the outer layer comprises one or more copolymers of one or more hydrophilic ethylenically unsaturated monomers containing acid functionality, the one or more hydrophobic ethylenically unsaturated monomers and optionally, one or more nonionic hydrophilic ethylenically unsaturated monomers wherein the third layer has a lower concentration of the one or more hydrophilic ethylenically unsaturated monomers containing acid functionality than the second layer; wherein adjacent to the first layer is the polymeric acid core and a void is formed inside the shell, and the structure has an mean volume particle size of 700 nm to 2000 nm, the concentration of residual monomers is 200 parts per million or less and the volume void inside the shell is 40 percent or greater based on the volume of the hollow polymeric spheres.