May 13, 2008  (45)  Date of Patent:  (IO)  Patent No.:  US 7,371,273 B2  c12)  United States Patent  Vincent et al.  (54)  LATEXES AND INK-JET INKS PREPARED  USING BLOCKED ACID MONOMERS  (75)  Inventors:  Kent D. Vincent,  Cupertino, CA (US);  Sivapackia Ganapathiappan,  Los  Altos, CA (US)  (73)  Assignee:  Hewlett-Packard Development  Company, L.P.,  Houston, TX (US)  ( *)  Notice:  Subject to any disclaimer, the term of this  patent is extended or adjusted under 35  U.S.C. 154(b) by  O  days.  (21)  Appl. No.:  10/741,536  (22)  Filed:  Dec. 19, 2003  (65)  Prior Publication Data  (56)  References Cited  U.S. PATENT DOCUMENTS  US 2005/0137319 Al  Jun. 23, 2005  (51)  Int. Cl.  (52)  U.S. Cl.  ..................  106/31.25;  106/31.6; 524/547;  524/556; 524/599; 524/609; 524/610; 524/612;  524/853  (58)  Field of Classification Search  ............. 106/31.25,  106/31.6; 524/547, 556, 599, 609, 610, 612,  524/853  See application file for complete search history.  9 Claims, No Drawings  (57)  ABSTRACT  FOREIGN PATENT DOCUMENTS  C09D 11100  (2006.01)  C08F 8112  (2006.01)  C08F 246100  (2006.01)  C08F 212114  (2006.01)  C08F 220118  (2006.01)  5,936,008 A *  5,981,651 A *  5,990,202 A  6,031,019 A *  6,057,384 A  6,239,193 Bl*  6,306,994 Bl *  6,417,249 Bl  6,541,590 Bl*  8/1999 Jones et al. ................. 523/161  11/1999 Patel et al. . ................ 524/773  11/1999 Nguyen et al.  2/2000 Tsutsumi et al ............ 523/160  5/2000 Nguyen et al.  5/2001 Cheng et al. ............... 523/160  10/2001 Donald et al. ........... 526/317.1  7/2002 Nguyen et al.  4/2003 Johnson et al. ............. 526/281  2002/0198287 Al*  12/2002 Ohta et al. .................. 523/160  2003/0176532 Al*  9/2003 Chung et al. ............... 523/160  EP  869160 A2 *  10/1998  EP  1108758 A2 *  6/2001  FR  2 676 451  11/1992  JP  62283174 A  *  12/1987  WO  WO 01/85808 Al  11/2001  * cited by examiner  Primary Examiner-Kelechi  C. Egwim  The present is drawn to the use of blocked acid monomers  for the incorporation of highly acidic groups, such as strong  acids and multiple acids, on the surface oflatex particles via  emulsion polymerization. In accordance with this, a method  of forming latex particulates having high charge density  surfaces can comprise the steps of preparing a monomer  emulsion including an aqueous phase and an organic mono› mer phase, wherein the organic monomer phase includes at  least one blocked acid monomer; polymerizing the organic  monomer phase to form blocked acid latex particulates  dispersed in the aqueous phase; and unblocking the blocked  acid latex particulates to form acidified latex particulates.  5,708,095 A *  1/1998 Grezzo Page et al. ...... 525/301  US007371273B2 