US 9,809,722 B2
Transitorially erasable ink compositions and writing instruments containing same
Jiandong Zhu, Aurora, IL (US); and Wing Sum Vincent Kwan, Chicago, IL (US)
Assigned to SANFORD, L.P., Atlanta, GA (US)
Filed by SANFORD, L.P., Downers Grove, IL (US)
Filed on Jun. 30, 2015, as Appl. No. 14/788,320.
Prior Publication US 2017/0002217 A1, Jan. 5, 2017
Int. Cl. B43K 5/00 (2006.01); B43K 7/03 (2006.01); B43K 8/02 (2006.01); C09D 11/16 (2014.01); C09D 11/18 (2006.01); C09D 107/00 (2006.01)
CPC C09D 11/16 (2013.01) [B43K 5/00 (2013.01); B43K 7/03 (2013.01); B43K 8/02 (2013.01); C09D 11/18 (2013.01); C09D 107/00 (2013.01)] 20 Claims
 
1. An erasable ink composition, comprising:
an aliphatic hydrocarbon solvent;
a rubber dissolved in the aliphatic hydrocarbon solvent;
a hydrophilic pigment; and
a surfactant.