Sumitomo Naugatuck Co., Ltd.

Nobujiro Izaki

Saburo Mishiba

Sadao Sekiguchi

Kojiro Matsumoto

Tetsuo Ishikawa

Masashi Nakayama

A color developer sheet sensitized in a color developing property on contact with a chromogenic material and improved in the light-resistance of the developed color, which comprises a support sheet and a coating composition comprising an organic color developer and, as a binder, a latex of a copolymer prepared by polymerization of a mixture essentially consisting of about 20 to 70% by weight of one or more aliphatic conjugated diolefin monomers, about 0.5 to 15% by weight of one or more unsaturated carboxylic acid monomers and about 15 to 79.5% by weight of one or more other olefin monomers copolymerizable with them and having a gel content of about 95 to 100% by weight applied onto a surface of the said support sheet to make a color developer layer.

Color developing sheet for pressure-sensitive recording systems

Color developing sheet with organic developer and latex binder

A composition for paper coating which comprises a pigment and, as a pigment binder, a synthetic copolymer latex comprising about 24.5 to 50 parts by weight of at least one aliphatic conjugated diolefin, about 0.5 to 10 parts by weight of at least one ethylenically unsaturated carboxylic acid and about 40 to 75 parts by weight of at least one monoolefinic monomer copolymerizable with the aliphatic conjugated diolefin and the ethylenically unsaturated carboxylic acid, the synthetic copolymer having a gel content of not more than about 60 % by weight based on the weight of the synthetic copolymer.

Composition for paper coating

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Niihama, Japan

Nobujiro Izaki