US 11,866,603 B2
Color-change and erasable writing compositions, writing instruments, and systems
Michael Moskal, Pottstown, PA (US); Abigail E. Meyer, West Point, NY (US); and Margaret Katherine Brogan, Downingtown, PA (US)
Assigned to Crayola LLC, Easton, PA (US)
Filed by Crayola LLC, Easton, PA (US)
Filed on Jan. 3, 2020, as Appl. No. 16/733,916.
Claims priority of provisional application 62/787,842, filed on Jan. 3, 2019.
Prior Publication US 2020/0216704 A1, Jul. 9, 2020
Int. Cl. C09D 13/00 (2006.01); C09D 9/00 (2006.01); B43K 19/14 (2006.01)
CPC C09D 13/00 (2013.01) [B43K 19/14 (2013.01); C09D 9/00 (2013.01)] 10 Claims
 
1. A writing composition comprising:
a phenolic resin;
stearic acid in an amount of between about 35 wt % and 50 wt % and stearyl alcohol in an amount between 35 wt % and 50 wt %;
at least one leuco dye; and
optionally at least one additive; and
an inert mineral filler comprising calcined clay.