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US 4,996,110 AGranted
White board
AssigneeBridgestone Corporation
InventorsItsuo Tanuma, Hiromi Otsuru, Toshio Honda
Life of this patent
Estimating the term…
Abstract
A white board comprises a front surface layer composed of a polyester film having undergone a hard coat treatment and a rear surface layer composed of a sheet-like magnet. The white board can be easily attached to and detached from steel walls, glass plates, etc. and stored in a rolled state when not in use.
Claims7
A white board comprising;
- a front surface layer composed of a colored polyester film having undergone a hard coat treatment to provide a hard coat layer and, a rear surface layer composed of a magnetic sheet comprising a magnet in which a magnetic pressure sensitive adhesive composed of a pressure sensitive adhesive composition containing a ferromagnetic material is formed in a sheet, wherein said hard coat treatment is a treatment by which a surface of said transparent polyester film is treated with a hard coat treating agent consisting essentially of polysiloxane.
A white board comprising;
- a front surface layer composed of a transparent polyester film having undergone a hard coat treatment to provide a hard coat layer and, a rear surface layer composed of a magnetic sheet comprising a magnet in which a magnetic pressure sensitive adhesive composed of a pressure sensitive adhesive composition containing a ferromagnetic material is formed in a sheet, the white board further comprising an intermediate layer composed of a colored plastic film disposed between the front surface layer and said rear surface layer, wherein said hard coat treatment is a treatment by which a surface of said transparent polyester film is treated with a hard coat treating agent consisting essentially of polysiloxane.
A white board comprising;
- a front surface layer composed of a transparent polyester film having undergone a hard coat treatment to provide a hard coat layer and, a rear surface layer composed of a magnetic sheet comprising a magnet in which a magnetic pressure sensitive adhesive composed of a pressure sensitive adhesive composition containing a ferromagnetic material is formed in a sheet, the white board further comprising an intermediate layer composed of a colored plastic film disposed between the front surface layer and said rear surface layer and, wherein said hard coat treatment consists of a treatment by which a surface of said polyester film is treated with polysiloxane.
A white board comprising;
- a front surface layer composed of a colored polyester film having undergone a hard coat treatment to provide a hard coat layer and, a rear surface layer composed of a magnetic sheet comprising a magnet in which a magnetic pressure sensitive adhesive composed of a pressure sensitive adhesive composition containing a ferromagnetic material is formed in a sheet, wherein said hard coat treatment consists of a treatment by which a surface of said polyester film is treated with polysiloxane.
Dependencies are inferred from the claim text.