Composite particles
AssigneeRohm and Haas Company
InventorsRavi Mukkamala, Chao-Jen Chung
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Abstract
In the present invention a composite particle including: a first polymeric particle having a diameter of from 100 nm to 3.5 microns including a core and a shell: the core including, when dry, at least one void; and the shell polymer having a calculated glass transition temperature (“Tg”) greater than 50° C.; and a second polymeric particle disposed on the surface of the first polymeric particle, the second polymeric particle having a minimum film-forming temperature of greater than 20° C.; wherein the ratio of the diameter of the first polymeric particle to the diameter of the second polymeric particle is from 1 to 50; and wherein the ratio of the weight of the first polymeric particle to the weight of the second polymeric particle is from 0.1 to 40, is provided.
Claims9
A composite particle comprising:
- a first polymeric particle having a diameter of from 100 nm to 3.5 microns comprising a core and a shell:
- said core comprising, when dry, at least one void, and
- said shell polymer having a calculated glass transition temperature(“Tg”) greater than 50° C., and
- a second polymeric particle disposed on the surface of said first polymeric particle, said second polymeric particle having been prepared by emulsion polymerization and having a minimum film-forming temperature of greater than 20° C.;
- wherein the ratio of the diameter of said first polymeric particle to the diameter of said second polymeric particle is from 1 to 50;
- and
- wherein the ratio of the weight of said first polymeric particle to the weight of said second polymeric particle is from 0.1 to 40.
Dependencies are inferred from the claim text.