Nippon Soda Co., Ltd.

Satoshi Kodama

Kazumi Jyujyo

Toshio Aihara

Tadashi Kawakami

Hiroshi Fujii

Hiroshi Sakai

Shuntaro Kinoshita

Tadahiro Kondo

Shinichi Satoh

Toshiyuki Fukami

A rewritable recording material can be provided which contains at least one kind of phenolic compounds represented by formula (I) and which is capable of stably repeating coloring and discoloring for a long period of time as well as exerting superior storage properties such as heat resistance and moisture and heat resistance of the colored image and light resistance of the background. Also provided are a composition for forming a rewritable color-forming layer which is capable of forming a color-forming layer of the recording material, and a composition of a color-developing agent for a rewritable recording material. 

Rewritable recording material

Provided is a color-developing composition containing a molecular compound which has as a component compound a compound represented by formula (I) [wherein Y represents a C1-C12 hydrocarbon group which is chained or branched and saturated or unsaturated, or a C1-C8 hydrocarbon group which is chained or branched, saturated or unsaturated and has an ether or thioether bond; R, R, Rand Reach independently represent a C1-C6 alkyl group or C2-C6 alkenyl group; n, p, q and r each represents any integer of 0 to 4; and m represents any integer of 0 to 2]. Also provided is a recording material with a sufficient color-forming sensitivity, superior storage stability, and especially with an extremely little background fogging in a heat resistance test.

Color developing composition containing molecular compound, and recording material

An object of the present invention is to provide a recording material or a recording sheet that is excellent in background and image stabilities and further excellent in color-developing sensitivity. The recording material of the present invention contains a color-forming compound, an additive, and at least one compound represented by formula (I) [wherein Rand Reach independently represent a C-Calkyl group or the like; p represents 0 or any integer of 1 to 4; q represents 0 or any integer of 1 to 5; when p and q represents 2 or more, each of Rand each of Rare the same or different; Rand Reach independently represent a hydrogen atom or the like; Rrepresents a hydrogen atom or the like; and the bond represented by the wavy line represents E, Z, or a mixture thereof].

Recording material using phenolic compound

Provided is a recording material with a superior heat resistance and having a low content of a dihydroxydiphenylsulfone derivative, and a color-developing composition for producing the recording material. With the use of this color-developing composition, a recording material with a superior heat resistance at the background part can be provided and the content of a dihydroxydiphenylsulfone derivative, such as 4,4'-dihydroxydiphenylsulfone, in the color-developing composition can be reduced to 2% by mass or less, or further to 1% by mass or less.

Color-developing composition and recording material containing the same

Provided is a recording material with a superior storage property for the background and image, particularly with a remarkable superiority in any of light resistance of the background, and light, moisture and heat resistance of the image. The recording material contains a phenolic compound represented by formula (I) [wherein R-Reach independently represent a hydrogen atom or C-Calkyl group; Rrepresents a hydrogen atom, C-Calkyl group or C-Calkoxy group, with the proviso that when Ris a hydrogen atom, Ris a C-Calkyl group, when Ris a C-Calkyl group, Ris a hydrogen atom, and when Ris a C-Calkoxy group, Ris a C-Calkoxy group]. 

Phenolic compound and recording material

An object of the present invention is to provide a recording material that is excellent in color-developing properties and background and image stabilities, and a compound used therein. The present invention relates to a compound represented by the formula (I) [wherein Rto Reach independently represent a halogen atom or the like; n, p, q, and r each independently represent 0 or any integer of 1 to 4; m represents 0 or any integer of 1 to 2; a represents any integer of 1 to 10; Rrepresents a hydrogen atom or the like; Rrepresents an ORgroup or the like; and Rand Reach independently represent a hydrogen atom or the like], a composition containing the compound, a method for producing the compound, a recording material containing at least one compound represented by the formula (I), and a recording sheet having the recording material.

Provided is a color-developing composition for recording materials having a superior heat resistance. The color-developing composition is a reaction composition containing a mixture of compounds represented by formula (III) obtained by reacting a dihydroxydiphenylsulfone derivative represented by formula (I) with a dihalide represented by formula (II) X&#x2014;Y&#x2014;X (II), wherein, in a composition where the content of a compound with n=1 in said reaction composition is from 5 to 80% by mass of the total solid content of the composition, at least 10% by mass of the compound with n=1 is a crystalline material. 

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Ichihara, Japan

Satoshi Kodama