Nippon Paper Industries Co., Ltd.

Api Corporation

Mitsubishi Chemical Corporation

Mamoru Suga

Yoshimi Midorikawa

Yoshimune Aosaki

Yukiko Sato

Yoshihide Kimura

Akihito Ogino

Mai Higuchi

Keiichiro Inada

Aya Kato

Tatsuo Nagai

Junpei Natsui

Takashi Date

Naomi Sumikawa

Katsuto Ohse

Hiroshi Kohama

Tatsuyuki Kurihara

Nanako Okamoto

Kaori Suzuki

The present invention provides a compound represented by the formula (1). The compound represented by the formula (1) is a developing agent superior in both color-developing sensitivity with low energy and image stability [in the following formula, wherein Ris a hydrogen atom, an alkyl group, an alkenyl group, an aryl group or an aralkyl group, 

Phenolsulfonic acid aryl ester, developing agent, and heat-sensitive recording material

The invention provides a phenolsulfonic acid aryl ester represented by formula (1) wherein each symbol is as defined in the description. The phenolsulfonic acid aryl ester is useful as a developer to provide a thermal recording material with good color-developing sensitivity, image density when printed at a low application energy (i.e., high start-up sensitivity), and heat and plasticizer resistance. The invention also provides a thermal recording material using the developer.

Phenolsulfonic acid aryl ester derivative, and heat-sensitive recording material using same

The present invention provides a thermosensitive recording medium with excellent color developing sensitivity, moist heat resistance and plasticizer resistance, as well as excellent heat resistance, background coloring, light resistance and the like in the printed image. A diphenyl sulfone derivative containing a hydroxyl group on one end and an alkoxy group on the other end has a higher melting point than the one containing hydroxyl groups on both ends. As a result, the thermosensitive recording medium obtained using the diphenyl sulfone derivative as the color developing agent in the thermosensitive color developing layer has excellent heat resistance. However the color developing sensitivity of the thermosensitive recording medium generally declines simultaneously, when a color developing agent with a high melting point is ordinarily used. The thermosensitive recording medium of the present invention that uses a combination of the diphenyl sulfone derivative and a specific phenol derivative in the thermosensitive color developing layer has a good color developing sensitivity and an improved balance among the properties such as moist heat resistance, plasticizer resistance and the like.

Thermosensitive recording medium

Provided is a thermal recording material superior in color development sensitivity, and having good preservation properties such as in heat resistance, moisture resistance, water resistance and the like. A thermal recording material comprising a support and a thermal recording layer comprising a colorless or pale basic leucodye and a developer to develop color of the basic leucodye, wherein the aforementioned developer comprises a first developer which is a condensate or condensed composition represented by the following formula (I) and a second developer other than the first developer, and the proportion of the first developer to the total amount of the developers is not less than 2 wt % and less than 50 wt %: wherein R is a hydrogen atom, a halogen atom, a hydroxyl group, a lower alkyl group, an alkoxyl group, a cyano group, a nitro group, an aryl group or an aralkyl group, R in the number of m may be the same or different, m is an integer of 0 to 3, n is an integer of 0 to 3, and X and Y are each a hydrogen atom, an alkyl group or an aryl group.

Thermal recording material

The present invention relates to a developer mixture for a thermal recording material, which comprises a mixture of the first organic developer comprising a condensate or a condensed composition represented by the formula (I): wherein R is a lower alkyl group or an aralkyl group, n is an integer of 0 to 5, and X and Y are each a hydrogen atom, an alkyl group or an aryl group, andthe second organic developer other than the first organic developer (except 2,2-bis(3-methyl-4-hydroxyphenyl)propane), a developer mixture for a thermal recording material, and a thermal recording material having a heat-coloring layer containing the developer mixture. Using the developer mixture for a thermal recording material of the present invention, a thermal recording material sufficiently satisfying the recent requirement for high sensitivity, and having superior preservation stability of color images and non-image areas can be realized.

Developer mixture for thermal recording materials and thermal recording materials

The object of the present invention is to provide a novel developer capable or realizing a thermal recording material superior in preservation stability (i.e., heat resistance, moisture resistance) of color images and non-image areas, while satisfying the recent request for high sensitivity, and a thermal recording material using the developer. The developer for a thermal recording material of the present invention is characterized in that it consists of a composition containing, of condensates represented by the formula (I): wherein R is a halogen atom, a hydroxyl group, an alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, a cyano group, a nitro group, an aryl group or an aralkyl group, R in the number of m may be the same or different and m is an integer of 0&#x2013;3, and n is an integer of 0&#x2013;3, a condensate having two cores wherein n=0 as a main component, and at least one kind of condensate of the formula wherein n=1&#x2013;3, and that a thermal recording material obtained using this developer shows high sensitivity, high dynamic color density, and superior preservation stability.

Developers for thermal recording materials and thermal recording materials

Growing community of inventors

Tokyo, Japan

Mamoru Suga