Ricoh Company, Ltd.

Natoco Paint Co., Ltd.

Hironori Hata

Susumu Kawakami

Shigekazu Teranishi

Yoichi Iwaki

Hiroshi Tohmatsu

Keiichi Shiokawa

Yoji Ide

Norio Yokoyama

Yutaka Sakai

Fumihiro Sasaki

Keishi Taniguchi

Satoshi Mochizuki

Shigeyuki Harada

Tohru Suganuma

Takahisa Kato

Hidefumi Gohhara

The object of the present invention is to prevent the sticking of the heat sensitive transfer recording film without generating head refuse and further to prevent transfer obstruction. More particlarly, the present invention provides a compound comprising a polydimethylsiloxane copolymer and one or more synthetic resin(s) selected from a group consisting of polyvinyl acetate derivatives, polyamide, acrylic resin, epoxy resin, unsaturated polyester resin and precursor of unsaturated polyester and/or cellulose derivatives; and sticking proof agents containing said compound; and a heat sensitive transfer film having a sticking proof layer formed by using the agents.

Composition, antisticking agents, and thermal transfer recording films

A thermal image transfer recording medium includes a substrate, a thermal image transfer ink layer provided on the substrate, and a heat resistant protective layer which is provided on the back side of the substrate, opposite to the thermal transfer ink layer with respect to the substrate, with which a thermal head comes into contact. The heat resistant protective layer is made of an organic polymeric material free from cross-linking structure, with a film strength of 10 mN or more, and the surface of the heat resistant protective layer has a contact angle with pure water of 95.degree. or more and a dynamic coefficient of friction of 0.07 or loss. The heat resistant protective layer may also be made of a modified copolymer containing (a) a main backbone chain polymer including an active-hydrogen-containing polymer which encompasses no cellulose compounds and (b) a side chain polymer which is a copolymer of a reactive silicone and a vinyl monomer.

Thermal image transfer recording medium

A thermal image transfer recording medium includes a substrate, a thermal image transfer ink layer provided on the substrate, and a heat resistant protective layer which is provided on the back side of the substrate, opposite to the thermal transfer ink layer with respect to the substrate, with which a thermal head comes into contact. The heat resistant protective layer is made of an organic polymeric material free from cross-linking structure, with a film strength of 10 mN or more, and the surface of the heat resistant protective layer has a contact angle with pure water of 95.degree. or more and a dynamic coefficient of friction of 0.07 or less. The heat resistant protective layer may also be made of a modified copolymer containing (a) a main backbone chain polymer including an active-hydrogen-containing polymer which encompasses no cellulose compounds and (b) a side chain polymer which is a copolymer of a reactive silicone and a vinyl monomer.

A carrier for a dry two-component developer, includes a core material and a silicone-modified acrylic resin layer coated on the surface of the core material, the silicone-modified acrylic resin layer including a silicone-modified acrylic resin, with the ratio of the percentage transmission of infrared spectrum Si--O stretching vibrations (T.sub.Si) of the silicone-modified acrylic resin layer to the percentage transmission of infrared spectrum C.dbd.O stretching vibrations (T.sub.C) thereof, T.sub.Si /T.sub.C, being at least 1.0. The silicone-modified acrylic resin layer can be made from a water-soluble synthetic resin solution containing a silicone macromonomer (A) with a vinyl group being introduced into one terminal thereof, and a vinyl monomer (B) which is copolymerizable with the silicone macromonomer (A), with the molecular weight of the silicone macromonomer (A) of the silicone-modified acrylic resin being in the range of 1,000 to 10,000. Methods of producing such carriers are provided.

Carrier for dry two-component developer and method of producing the same

A thermal image transfer recording medium is composed of a support, a thermal image transfer ink layer formed thereon, and a heat resistant protective layer which is composed of a cellulose-modified polymer with a backbone polymer thereof being cellulose and/or a cellulose derivative and a branch polymer thereof being a copolymer of a reactive silicone oil and a vinyl monomer, and which is formed on the back side of the support opposite to the thermal image transfer ink layer with respect to the support.

Growing community of inventors

Aichi, Japan

Hironori Hata