Patent ID: 8791058

Claim:
A composition comprising a cationic nanogel, comprising chemically crosslinked macromolecules comprising a core C, wherein said nanogel comprises: crosslinking units R derived from a crosslinking monomer R comprising at least two polymerizable groups, and core units C derived from at least one monomer C comprising only one polymerizable group, comprising: wherein the core units C comprise: cationic or potentially cationic units C cat derived from at least one cationic or potentially cationic monomer C cat , and optionally, hydrophilic or hydrophobic neutral units C N , derived from at least one hydrophilic or hydrophobic neutral monomer C N , further wherein: the nanogel is different than a star copolymer that comprises macromolecular branches at the periphery of the core, and the average size of said macromolecules ranges from 5 to 500 nm.