| 摘要 |
An opacifying particle including 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, the pigment particle being at least partially encapsulated in a polymeric shell having a calculated thickness of from 35 nm to 200 nm, wherein the polymeric shell includes at least a first polymer phase and a second polymer phase, wherein the first polymer is substantially in contact with the surface of the pigment particle providing a calculated shell thickness of at least 25 mm. and wherein the first polymer has a refractive index of at least 0.03 units less than the refractive index of the second polymer is provided as is a composition such as, for example, a coating or a plastic including the opacifying particle. Further provided is a composition including pigment particles having an average particle diameter of from 0.15 micron to 1.0 micron and a refractive index of at least 1.8, the pigment particles being at least par tially encapsulated in a shell of a first polymer having a calculated thickness of from 25 nm to 200 nm, and the encapsulated pigment particles in contact with from 10% to 600% by weight, based on the weight of the first polymer, second polymer, wherein the first polymer has a refractive index of at least 0.03 units less than the refractive index of the second polymer.
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