Patent ID: 7932191

Claim:
A composition comprising particles which comprise a core material within a polymeric shell, wherein the core material comprises a hydrophobic substance, in which the amount of the polymeric shell forms 8% to 15% of the total weight of the particles, wherein the polymeric shell comprises a copolymer formed from a monomer blend which comprises, A) 20 to 90% by weight of an ethylenically unsaturated water soluble monomer which water soluble monomer is anionic or cationic, B) 5 to 90% by weight of a multifunctional monomer, wherein the multifunctional monomer is ethoxylated bisphenol A diacrylate, propoxylated neopentyl glycol diacrylate, tris(2-hydroxyethyl) isocyanurate triacrylate, trimethylolpropane triacrylate, 1,3-butylene glycol diacrylate, 1,6-hexanediol diacrylate, or 1,4-butanediol diacrylate, and C) 10 to 50% by weight other monomer, and wherein the amount of the polymeric shell and the proportions of A, B and C are such that the particles exhibit a half height of at least 350° C.