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:
Dec. 21, 2010
Filed:
Dec. 08, 2006
Tomoaki Kirino, Tokyo, JP;
Tomoaki Kirino, Tokyo, JP;
Tokai Carbon Co., Ltd., Tokyo, JP;
Abstract
A surface-modified carbon black pigment suitable as electronic paper black particles, a silicone oil dispersion of the carbon black pigment, and a process for producing the carbon black pigment are disclosed. The carbon black pigment includes surface-modified carbon black, a diphenylmethane group that is bonded to the carbon black via a urethane bond through a functional group on the surface of the carbon black being bonded to a polysiloxane group. The carbon black dispersion includes a silicone oil and the carbon black pigment, the carbon black pigment being dispersed in the silicone oil at a concentration of 1 to 20 wt %. The process for producing a carbon black pigment for electronic paper includes reacting a functional group on the surface of carbon black with a diphenyl compound having isocyanate groups on both ends in a non-reactive organic solvent so that a diphenylmethane group is bonded to the surface of the carbon black via a urethane bond, and causing the diphenylmethane group to be bonded to a polysiloxane in a silicone oil.