Ricoh Company, Ltd.

Shuhei Shiraishi

Shigeyuki Harada

Minoru Hakiri

Masanaka Nagamoto

Junko Yamaguchi

Toshinobu Nishizaki

Toshiyuki Osawa

A thermal image transfer recording medium comprising a support, and a thermal image transfer layer formed thereon, comprising as its main components an acrylic resin having a molecular weight of 1,000,000 or more and a glass transition temperature of 5.degree. to 60.degree. C., and a coloring agent. In the recording medium, a releasing layer comprising as its main component a wax having a melting point or softening point of 70.degree. to 120.degree. C. can be interposed between the support and the thermal image transfer layer; and an additional thermal image transfer layer comprising as its main component a thermoplastic resin whose glass transition temperature is equal to or higher than that of the acrylic resin contained in the thermal image transfer layer can also be interposed between the releasing layer and the thermal image transfer layer.

Thermal image transfer recording medium

A thermal image transfer recording medium is disclosed, which comprises a support; a releasing layer formed on the support, comprising a wax component; and a thermal image transfer layer formed on the releasing layer, comprising a copolymer prepared from an alkylmethacrylate and a (meth)acrylonitrile, optionally in addition thereto a vinyl monomer, with a glass transition temperature of 30.degree. C. or more, and a coloring agent, the thermal image transfer layer having fine cracks having a length of 0.8 to 8 .mu.m with the number thereof being 25 to 100 per 1000 .mu.m.sup.2 on the surface thereof. In this recording medium, the thermal image transfer layer may further comprise a crosslinked acrylic resin with a glass transition temperature of 10.degree. C. or more and a number average molecular weight of 1,000,000 or more. Furthermore, an auxiliary thermal image transfer layer comprising a thermoplastic resin with a glass transition temperature of 30.degree. C. or more may also be interposed between the releasing layer and the thermal image transfer layer.

A thermal image transfer sheet comprises a support and an ink layer formed thereon, which ink layer comprises as the main components a colorant and at least one binder resin selected from the group consisting of polyvinyl butyral resin, vinyl chloride resin, vinylidene chloride resin, vinylidene chloride-acrylonitrile copolymer resin, fluorine-containing resin, polyamide or a copolymer thereof, polyethylene resin, polypropylene resin, polyester resin, NBR, and ethylene - vinyl acetate copolymer resin, and a thermal image transfer recording medium comprises the thermal image transfer sheet and an image-receiving member is composed of a support and an image-receiving layer preferably comprising as the main component a polyamide and/or a copolymer of the polyamide, or an image-receiving layer made of nylon 6 or nylon 66.

Thermal image transfer sheet and thermal image transfer recording medium

A thermal image transfer recording medium is disclosed which comprises a substrate, a first image transfer layer formed thereon comprising as the main components styrene resin particles having a melting or softening point ranging from 72.degree. to 140.degree. C., and a wax component having a melting or softening point ranging from 70.degree. C. to 130.degree. C., and a second image transfer layer formed on the first image transfer layer, comprising as the main components a dye or a pigment, and adhesiveness-providing resin particles having a melting or softening point ranging from 60.degree. C. to 110.degree. C., and a wax component having a melting or softening point ranging from 70.degree. C. to 130.degree. C.

A thermal image transfer recording medium is disclosed, which comprises a substrate, a first image transfer layer formed thereon comprising as the main components styrene resin particles having a melting or softening point ranging from 75.degree. C. to 140.degree. C., and a wax component having a melting or softening point ranging from 70.degree. C. to 130.degree. C., and a second image transfer layer formed on the first image transfer layer, comprising as the main components a dye or a pigment, and adhesiveness-providing resin particles having a melting or softening point ranging from 60.degree. C. to 110.degree. C., and a wax component having a melting or softening point ranging from 70.degree. C. to 130.degree. C.

The present invention provides an overcoated sheet which comprises forming, on at least one surface of a substrate, an overcoat layer consisting essentially of styrene/butylmethacrylate/unsaturated organic acid system copolymer, and is used as a transfer sheet for use in a plain-paper copier, a drafting film, a diazo second original film and the like.

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Mishima, Japan

Shuhei Shiraishi