The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 1994
Filed:
Nov. 06, 1992
Niro Watanabe, Tokyo, JP;
Atsushi Kijima, Tokyo, JP;
Yuji Nakatsu, Tokyo, JP;
Susumu Watanabe, Tokyo, JP;
Toppan Printing Co., Ltd., Tokyo, JP;
Abstract
A rewritable thermosensitive recording medium having a recording layer, the transparency of which reversibly changes depending on the temperature thereof. Further, the recording layer contains a matrix material and an organic low-molecular-weight material dispersed in the matrix material as main components thereof. Moreover, an alicyclic dicarboxylic acid compound is added to the organic low-molecular-weight material dispersed in the matrix material. Furthermore, by adding the alicyclic dicarboxylic acid compound to the organic low-molecular-weight material, the eutectic point of the organic low-molecular-weight material and the alicyclic dicarboxylic acid compound becomes higher than the melting point of the organic low-molecular-weight material. Additionally, in spite of the fact that the amount of the alicyclic dicarboxylic acid compound to be added to the organic low-molecular-weight material is small, the difference between the eutectic point of the organic low-molecular-weight material and the alicyclic dicarboxylic acid compound and the melting point of the organic low-molecular-weight material is much larger than those obtained in cases of conventional recording materials. Consequently, the range of temperature, to which the recording layer should be heated for changing a state thereof from an opaque state to a transparent state, can be considerably enlarged without reducing the opacity of the recording layer.