Pressure sensitive reproducing material

• US 5,070,066 A
• Filed: 05/16/1989
• Issued: 12/03/1991
• Est. Priority Date: 10/08/1986
• Status: Expired due to Fees

• Current Assignee: Adger Kogyo Co., Ltd.
• Original Assignee: Adger Kogyo Co., Ltd.
• Inventors: Iijima, Zenshiro
• Primary Examiner(s): Hess, Bruce H.
• Application Number:
  US07/352,612
• Time in Patent Office: 931 Days
• Field of Search: 106/21, 427/151, 503/209, 503/220, 503/224, 503/225, 503/201
• US Class Current: 503/201
• CPC Class Codes: B41M 5/132 Chemical colour-forming components; Additives or binders therefor
• CPC Class Codes: B41M 5/20 using electric current B41M5/24 takes precedence ; processes in which the current is transformed into a heat pattern for obtaining transfer to a receptor sheet B41M5/382; electro-coagulable or electro-adhesive printing or recording B41C1/105

Abstract

The object of the present invention is to provide a pressure sensitive reproducing material which allows reproduced letters or patterns to fade away automatically with the passage of time.

The present invention accomplished the object by a pressure sensitive reproducing material composed of a colored material supported on a substrate, in which the colored material comprises a phthalein group indicator which is color-developed by an inorganic weakly basic substance jointly used with an organic amine and contains hygroscopic material or drying inhibitor.

Claims

1. A method of drawing erasable letters and/or patterns on a piece of cloth or paper comprising the following steps:

1) placing the piece of cloth or paper underneath a pressure sensitive reproducing material composed of a substrate and a colored material supported on said substrate wherein the colored material includes a) a phthalein group indicator b) an inorganic weakly basic substance and an organic amine and c) a hygroscopic material or a drying inhibitor, said phthalein group indicator being color-developed by said inorganic weakly basic substance and said organic amine; and

2) applying a pressure with a pressure applying tool on the surface of the pressure sensitive reproducing material at desired places.

2. A method of drawing erasable letters and/or patterns on a piece of cloth or paper according to claim 1, wherein the content by weight of the phthalein group indicator is 0.1-10%, the inorganic weakly basic substance is 0.5-20%, the organic amine is 0.5-20% and the drying inhibitor or hygroscopic material is 5-80%.

3. A method of drawing erasable letters and/or patterns on a piece of cloth or paper according to claim 1, wherein the substrate is selected from the group consisting of paper, cloth, hygroscopic rubber, and plastic film.