Nippon Paper Industries Co., Ltd.

Api Corporation

Naomi Sumikawa

Yoshihide Kimura

Kaoru Hamada

Yoshimi Midorikawa

Toshio Kaneko

Mamoru Suga

Yuji Tsuzuki

Hidenori Ogawa

Tastuhiko Sakamoto

Tomoniri Sekine

Kaori Suzuki

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

A thermally recording sheet which has high sensitivity in color development, satisfactory background heat resistance, and a satisfactory background color. The sheet contains a dihydroxydiphenylsulfone compound represented by general formula (1) as a color developer and a sulfonamide represented by general formula (2). In the formula, R and R each represents C alkyl, alkenyl, or halogeno; and a and b each is an integer of 0 to 3. In the formula, R represents C alkyl or electron-attracting group; and n is an integer of 0 to 2.

Thermal recording material

The present invention is to provide a thermally sensitive recording type adhesive label possessing a thermally sensitive recording layer on a substrate, and an adhesive layer and a release paper on the reverse side of the substrate, wherein said substrate is a neutral paper containing a wet strength reinforcing agent and further containing 5-20 wt. % of a filler to the total weight of pulp.

Thermally sensitive recording type adhesive level

Growing community of inventors

Tokyo, Japan

Naomi Sumikawa