Kanzaki Paper Manufacturing Co., Ltd.

Kazuyuki Shinmitsu

Shunsuke Shioi

Makoto Miyake

Masanao Tajiri

Mitsuru Kondo

Nobuo Kanda

Kazuyoshi Wakata

An improved pressure sensitive recording sheet capable of causing an improved color development which comprises a substrate and a layer containing microcapsules each containing an electron-donative chromogenic material and a hydrophobic medium containing benzyl toluene being formed on the substrate. The pressure sensitive recording sheet exhibits an excellent color-developing property and provides clear color images of high density.

Pressure sensitive recording sheet with a layer containing microcapsules

A microcapsule-containing ink composition for flexographic printing containing microcapsules, an adhesive and an ink medium, the composition being characterized in that the adhesive includes a polymer composed of a methacrylate or acrylate singly or as its main component and having an average molecular weight of 3000 to 50,000.

Microcapsule-containing ink composition for flexographic printing

A non-aqueous printing ink composition containing a microcapsule and a microencapsulated ink composition characterized in that the microcapsule has a capsule wall comprising melamine-formaldehyde resin and has an average particle size of 1.8 to 3.5.mu..

Ink composition containing microcapsules

In a microencapsulation process which comprises polycondensating a hydrophilic melamine-formaldehyde resin type precondensate in water or in a hydrophilic medium containing an emulsifier to form capsule wall film around a hydrophobic core material to obtain microcapsules, the process which is characterized in that the emulsifier is a copolymer of (1) an unsaturated monobasic acid monomer of at least 80 mole %, (2) a hydrophobic monomer and (3) a hydrophilic monomer other than a carboxylic acid.

Process for preparing microcapsules

A pressure sensitive manifold sheet characterized in that a chelate record material comprising an iron (III) compound and/or a vanadium compound, and an aromatic compound having at least one of hydroxyl group and mercapto group on the aromatic ring in combination therewith is used further in combination with an infrared absorbing organic compound.

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Nara, Japan

Kazuyuki Shinmitsu