Erasable marking composition
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United States of America Patent
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Mar 16, 2004
Issued Date -
N/A
app pub date -
Oct 10, 2001
filing date -
Mar 27, 2000
priority date (Note) -
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Abstract
A water-based, erasable marking composition comprising 1-86% by weight water, 0.3-38% by weight pigment, 13-45% by weight polyurethane, and 0-85% by weight glycerin, wherein said polyurethane has a viscosity which increases by at least a factor of 10 when said polyurethane is dried from a 30% dispersion of said polyurethane in water to a 65% polyurethane dispersion in water. The present invention also includes an application instrument comprising an outer body having a first end, an applicator at the first end of the outer body, a reservoir included within the outer body and in fluid communication with the applicator, and a water-based, erasable marking composition within the reservoir. The water-based, erasable marking composition comprises the composition of the invention.
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