Publication Date: 2002-Nov-18
The IP.com Prior Art Database
Write-removable articles comprising a fluoropolymer film adhesively attached to a substrate.
This disclosure relates to write-removable surfaces that can be re-used.
In the past, traditional classroom education relied entirely upon a blackboard and chalk as the medium for demonstration construction. This technique has proven to be relatively messy due to the chalk dust and smaller pieces of broken chalk. Blackboards are also limited in the range of chalk colors they can accept due to their dark color and difficulty in completely erasing chalk colors other than white.
A more economical solution to this problem is the use of dry erasable marking systems or dry-erase boards which use erasable marking pens to provide the utility of a blackboard or chalkboard, while eliminating the mess of chalk dust and the cleanup of multiple colors. Dry-erase boards typically have a smooth, markable, coated writing surface formed by coating a substrate with a lacquer coating which is subsequently cured.
Dry-erase marking pens are typically felt tip marking instruments containing specially formulated inks which satisfactorily mark the coated writing surfaces and can be substantially fully erased from these surfaces after the ink has dried. These dry-erase markers leave substantially no mess and erasure typically requires only minimal manual effort using conventional dry erasers, cloth, or tissue paper.
Previously made dry-erase boards include writing surfaces made of coated paper or film, melamine, or ceramic which are adhered to smooth, hard, rigid substrates such as paper board, fiber board, plastic, wood, and the like. Coated paper and film based dry-erase surfaces are relatively inexpensive, however, suffer from a number of disadvantages. The erasable, markable character of these surfaces deteriorates gradually with repeated application and erasure of dry erasable inks. The chemical materials used to mark these surfaces often cause deformation of these surfaces resulting in the formation of non-removable ghost images after continued use. These surfaces are also known to exhibit poor solvent resistance and are often incompatible with certain dry-erase markers. Ceramic based dry erase surfaces provide good erasability but are relatively expensive.
The present disclosure provides a write-removable article which comprises and preferably consists essentially of a fluoropolymer film attached to a substrate via an adhesive. The adhesive may be either a pressure-sensitive adhesive or a thermoset adhesive.
“Write-removable” means either directly erasable or removable using solvent without affecting the ability of the surface to accept writing; that is, the surface is reusable. Advantages of the write-removable articles of the present disclosure include that they are impervious to fluids typically used in markers used on write erase-boards and...