Polymer particles with additives encapsulated in microvoids
First Claim
1. A porous particle comprising a polymer binder and at least one additive distinct from any pore stabilizing compound present in the porous particle, wherein:
- the polymer binder comprises a solid compositionally continuous phase having an external particle surface;
discrete pores are dispersed within the solid compositionally continuous phase, forming internal pore surfaces; and
the at least one additive is present primarily in the discrete pores.
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Accused Products
Abstract
Porous particles comprising a polymer binder and at least one additive distinct from any pore stabilizing compound present in the particle, wherein: the polymer binder comprises a solid compositionally continuous phase having an external particle surface; discrete pores are dispersed within the solid compositionally continuous phase, forming internal pore surfaces; and the at least one additive is present primarily in the discrete pores. The additive may further preferably not be present in the solid compositionally continuous phase, and be substantially absent from the external particle surface. A toner set for forming a color electrophotographic image comprising a plurality of different colored toners, where at least one of the different colored toners comprise such porous particles comprising additives, and in a particular embodiment wherein at least two different colored toners each comprise different pigments present primarily in the internal pores. A process of making such porous particles.
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Citations
20 Claims
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1. A porous particle comprising a polymer binder and at least one additive distinct from any pore stabilizing compound present in the porous particle, wherein:
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the polymer binder comprises a solid compositionally continuous phase having an external particle surface; discrete pores are dispersed within the solid compositionally continuous phase, forming internal pore surfaces; and the at least one additive is present primarily in the discrete pores. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of making porous particles comprising a polymer binder and at least one additive, comprising:
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providing a first aqueous phase comprising at least one additive; dispersing the first aqueous phase in an organic solution containing a polymer binder to form a first emulsion; dispersing the first emulsion in a second aqueous phase to form a second emulsion; shearing the second emulsion in the presence of a particulate stabilizing agent to form droplets of the first emulsion in the second aqueous phase; and evaporating the organic solution from the droplets to form porous polymer particles;
wherein;
the formed polymer porous particles comprise a solid compositionally continuous polymer binder phase having an external particle surface;
discrete pores are dispersed within the solid compositionally continuous polymer binder phase, forming internal pore surfaces; and
the at least one additive is distinct from any pore stabilizing compound present in the porous particle and is present primarily in the discrete pores. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification