Patent ID: 8716365
Filing Date: 2014-05-06
Classification: C01P,C08K,C09C,C09D,Y10T

Abstract:
1. An opacifying particle comprising a pigment particle having an average particle diameter of from 0.15 micron to 1.0 micron and a refractive index of at least 1.8, said pigment particle being at least partially encapsulated in a polymeric shell having a calculated thickness of from 35 nm to 200 nm, wherein said polymeric shell comprises at least a first polymer phase and a second polymer phase, wherein said first polymer is substantially in contact with the surface of said pigment particle providing a calculated shell thickness of at least 25 nm. and wherein said first polymer has a refractive index of at least 0.03 units less than the refractive index of said second polymer.