White board

• US 4,996,110 A
• Filed: 08/19/1986
• Issued: 02/26/1991
• Est. Priority Date: 09/20/1985
• Status: Expired due to Term

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Otsuru, Hiromi, Tanuma, Itsuo, Honda, Toshio
• Primary Examiner(s): Thibodeau, Paul J.
• Application Number:
  US06/897,951
• Time in Patent Office: 1,652 Days
• Field of Search: 428/900, 428/480, 428/343, 428/356, 434/408, 434/409, 434/430
• US Class Current: 428/343
• CPC Class Codes: B43L 1/045 with magnetic action
• CPC Class Codes: Y10S 428/90 Magnetic feature
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2857 including metal or compound thereof or natural rubber
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

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.

Claims

1. 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.

2. A white board according to claim 1 wherein said hard coat treatment is a treatment by which a surface of said polyester film is treated with a hard coat treating agent.

3. A white board according to claim 1, wherein said magnetic sheet is so constructed as to be flexible.

4. 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.

5. A white board according to claim 4, wherein said magnetic sheet is so constructed as to be flexible.

6. 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.

7. 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.