Ricoh Company, Ltd.

Other

Kunitoshi Sugiyama

Hideyuki Kobori

Yoshihiko Hotta

Masafumi Torii

Masafumi Moriya

Kazuo Hosoda

Koji Kawai

Katsushi Sugiyama

Katsuaki Kokubo

Shuji Hanai

Tadafumi Ajiri

Kunio Arai

Tsutomu Kagawa

Kunichika Moroboshi

Hideyuki Santoh

Yoshihiko Itoh

Kunichika Morohoshi

A method for use in two-components electrostatic image developers is disclosed, in which secure separation of a carrier coating resinous materials from a core magnetic material is achieved without affecting the properties of the core materials through process steps benign to the environment in super- or sub-critical water compositions under the conditions of a temperature of 300&#xb0; C. or more and a pressure of 20 MPa. The core magnetic material is subsequently recycled for forming carrier. This method may also be useful for processing waste including magnetic materials with silicone resin coating.

System for separating electrophotographic carrier compositions and recycling the compositions

A reversible thermosensitive recording medium includes a reversible thermosensitive recording layer including a matrix resin and an organic low-molecular-weight material dispersed in the matrix resin, of which transparency is reversibly changeable depending upon the temperature thereof, and having (1) a transparentizing upper-limit temperature of 125&deg; C. or more, (2) a temperature difference of 20&deg; C. or less between said transparentizing upper-limit temperature and an opaqueness initiation lower-limit temperature, and (3) a transparentizing initiation temperature of less than 95&deg; C., and a method of recording and erasing images, using the recording medium, a method of producing the recording medium, and the application thereof a card, a label, writable or rewritable disk cartridge, disk and tape cassette are proposed.

Reversible thermosensitive recording medium, method of producing the medium, information recording devices using the medium, and image formation and erasing method using the medium

A method for use in two-components electrostatic image developers is disclosed, in which secure separation of a carrier coating resinous materials from a core magnetic material is achieved without affecting the properties of the core materials through process steps benign to the environment in super- or sub-critical water compositions under the conditions of a temperature of 300&deg; C. or more and a pressure of 20 MPa. The core magnetic material is subsequently recycled for forming carrier. This method may also be useful for processing waste including magnetic materials with silicone resin coating.

Method of separating electrophotographic carrier compositions and recycling the compositions

A reversible thermosensitive recording medium is capable of assuming a first color in a first temperature range which is above room temperature, having a first color assuming initiation temperature and a first color assuming upper-limit temperature, and assuming a second color when heated to a second temperature range which is above the first temperature range and then cooled, having a second color assuming lower-limit temperature, (a) the first color assuming upper-limit temperature being 125&deg; C. or more, (b) the difference between the first color assuming upper-limit temperature and the second color assuming lower-limit temperature being 20&deg; C. or less, and (c) the first color assuming initiation temperature being 95&deg; C. or more, and a method of recording and erasing images, using the recording medium, a method of producing the recording medium, and the application thereof a card, a label, writable or rewritable disk cartridge, disk and tape cassette are proposed.

Reversible thermosensitive recording medium, card, label, disk, disk cartridge, tape cassette, method of producing the recording medium, and method of recording and erasing images using the same

A reversible thermosensitive recording material composed of a support, and a reversible thermosensitive recording layer formed on the support, containing a matrix resin and an organic low-molecular-weight material, the organic low-molecular-weight material being dispersed in the form of discrete domains in the matrix resin, thereby constituting a phase-separation structure, with the periodic distance of the phase-separation structure of the reversible thermosensitive recording layer being 1.3 .mu.m or less. This reversible thermosensitive recording material can be produced by applying a coating liquid containing the organic low-molecular-weight material and the matrix resin which are dissolved in a solvent to the support to form the reversible thermosensitive recording layer on the support; and drying the applied coating liquid under such conditions controlled so as to obtain a 1.3 .mu.m or less periodic distance of the phase-separation structure of the reversible thermosensitive recording layer, while measuring the scattering angle of a light transmitted through the reversible thermosensitive recording layer by the light-scattering method.

Method for producing a reversible thermosensitive recording material

Reversible thermosensitive recording material and method for producing

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Numazu, Japan

Kunitoshi Sugiyama