Nippon Paper Industries Co., Ltd.

Nippon Paper Papylia Company, Limited

Yasuaki Matsumori

Akihito Ogino

Yoshimi Midorikawa

Yoshiaki Ishino

Masaki Kishimoto

Kenji Hirai

Junichi Hayakawa

Yoshihide Watanabe

Katsuto Ohse

Hiroshi Kohama

Eiji Kusano

Yukiko Satou

Kento Aoshima

Kazuyo Wadagami

Kumiko Katsumata

A water-dispersible sheet is described that maintains water dispersibility while providing suppressed time degradation of the tacky adhesiveness of a tacky adhesive layer. The water-dispersible sheet has a paper substrate with a multilayer structure. One layer of the multilayer structure is an inner layer that is not in contact with the tacky adhesive layer. Another layer is a surface layer that is in contact with the tacky adhesive layer. The layers independently include mixed pulps of a wood pulp and a refined pulp with an &#x3b1;-cellulose content of 88 % by weight or more. The weight ratio of the layers and the beating degree of the mixed pulps are set in the specific ranges.

Water-dispersible sheet

A water-dispersible sheet is described having suppressed time degradation of the tacky adhesiveness of the tacky adhesive layer, while maintaining water dispersibility. The base paper of the water-dispersible sheet has a multilayer structure, including an inner layer which is not in contact with a tacky adhesive layer and a surface layer which is in contact with the tacky adhesive layer. The layers are independently mixtures of papermaking fibers and an alkalized fibrous carboxymethyl cellulose.

The objective of the present invention is to provide a thermosensitive recording medium excellent in color developing property, especially excellent in bar code readability, under severe environment. Provided is a thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer contains a specific sulfone compound and a specific urea-urethane-based compound in a specific ratio.

Thermosensitive recording medium

As a thermosensitive recording medium utilizes a coloring reaction between a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent, a thermosensitive recording medium using an environment-friendly color developing agent is provided. Provided is a thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer comprises a gluconolactone as the electron accepting color developing agent.

The purpose of the present invention is to provide a thermosensitive recording medium with an increased gloss in the blank and printed portions, excellent color developing sensitivity and excellent printing run-ability, particularly excellent printing run-ability at high-speed printing. Provided is a thermosensitive recording medium having a thermosensitive recording layer comprising a colorless or pale colored basic leuco dye and an electron accepting color developing agent, an intermediate layer and a gloss layer as an outermost layer in this order on a substrate, wherein the intermediate layer is formed by containing a carboxyl group-containing resin and the gloss layer is formed by containing a long chain alkyl group-containing resin and an emulsion type silicone copolymer resin. The long chain alkyl group-containing resin is preferably an acrylic resin containing long-chain alkyl group(s) and the silicone copolymer resin is preferably a silicone-acryl copolymer resin and/or a silicone-urethane copolymer resin.

A thermosensitive recording label is provided having a thermosensitive recording layer and a tackifier layer installed sequentially on a transparent film substrate. The thermosensitive recording label has excellent water and weather resistance.

Thermosensitive recording label

The present invention present a thermosensitive recording medium having excellent printed image quality on a thermosensitive recording surface, particularly for bar code readability, and also good record density and recording property after storage. In a thermosensitive recording medium obtained by installing on a substrate a thermosensitive recording layer containing a colorless or pale electron donating leuco dye and an electron accepting coloring agent, the water drop absorbency of the surface on which a thermosensitive recording layer is installed on said substrate is adjusted to at least 50 seconds by having at least 5 wt. % of mechanical pulp present in the substrate and controlling the sizing agent treatment of the substrate.

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Tokyo, Japan

Yasuaki Matsumori