The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2012
Filed:
Sep. 25, 2009
Ravi Mukkamala, Lansdale, PA (US);
Chao-jen Chung, North Wales, PA (US);
Ravi Mukkamala, Lansdale, PA (US);
Chao-Jen Chung, North Wales, PA (US);
Rohm and Haas Company, Philadelphia, PA (US);
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. In certain embodiments the composite particle further includes pigment particles having a diameter of from 10 nm to 5 microns disposed on the surface of the composite particle, wherein the ratio of the weight of the pigment particles to the weight of the composite particle is from 0.1 to 10. Also provided is a method for forming the composite particles, a thermosensitive recording material including the composite particles and a method for providing the thermosensitive recording material.