Kao Corporation

Mitsuhiro Sasaki

Kuniyasu Kawabe

Shin-ichiro Yasuda

Tetsuya Asano

Koji Akiyama

Takashi Yamaguchi

Hiroyuki Kawaji

Kazuhiro Fujiki

Keiichi Fukuda

Harumasa Yamasaki

Koji Kameyama

Masanori Tanahashi

Nobuo Takazawa

Hideki Yamauchi

A cosmetic skin preparation containing a porous powder which contains water absorbed therein and whose surface is coated with a binder containing a crosslinked type organopolysiloxane.

Cosmetic skin preparation

The present invention is directed to an encapsulated toner for heat-and-pressure fixing having a heat-fusible core material containing at least a thermoplastic resin and a coloring agent and a shell formed thereon so as to cover the surface of the core material. An amorphous polyester is used as the main component of the shell, and the amount of the amorphous polyester is normally 3 to 50 parts by weight, based on 100 parts by weight of the core material. The encapsulated toner of the present invention is excellent in offset resistance, fixable even at a low temperature and excellent in blocking resistance when it is used for heat-and-pressure fixing using a heat roller.

Encapsulated toner for heat-and-pressure fixing and method for

The present invention is directed to an encapsulated toner for heat-and-pressure fixing whose shell contains a copolymer having one or more acid anhydride groups as the main component. The encapsulated toner of the present invention has excellent offset resistance and fixing ability even at a low fixing temperature, and also it is excellent in blocking resistance. Further, since the resin having a negative charge is used as a shell material, clear images free from background contamination can be stably formed for a large number of copying.

A toner for developing an electrostatic latent image which includes at least particulate magnetic materials and a binder resin has no particulate magnetic materials on the surface of the toner. In the toner, wherein A and b.sub.min satisfy the relationship: b.sub.min /A&gt;0.02, where A represents an average particle diameter of the toner, and b.sub.min represents a minimum distance between a particulate magnetic material located at a position closest to the surface of the toner and the toner surface.

Toner containing particulate magnetic materials

A method of forming fixed images including charging a photoconductor; exposing the photoconductor to light; developing an electrostatic latent image so that a toner is applied to the electrostatic latent image formed on the photoconductor to form a visible image; transferring the formed visible image to a recording medium; and fixing the transferred visible image onto the recording medium, such that the toner is a thermally dissociating encapsulated toner and the fixing process is carried out at a temperature of not less than 40.degree. C. and not more than 120.degree. C.

Apparatus for forming fixed images having encapsulated toner

A developing method of the present invention has the steps of forming a uniform layer of a nonmagnetic one-component toner on a developer carrying sleeve with a developer blade; rotating an electrostatic latent image forming member and the developer carrying sleeve; and applying the toner on the developer carrying sleeve onto an electrostatic latent image formed on the electrostatic latent image forming member. The toner used herein is an encapsulated toner having a heat-fusible core material and a shell formed thereon. By using this development for a nonmagnetic one-component toner of the present invention, clear images free from background can be stably formed for a large number of copying.

Method of development of nonmagnetic one-component toner and method for

The encapsulated toner for heat-and-pressure fixing which includes a heat-fusible core material containing at least a thermoplastic resin and a coloring agent, and a shell formed thereon so as to cover the surface of the core material is produced by a process having the step of carrying out in situ polymerization using a thermoplastic resin as a main component of the shell to form a shell having a structure in which a part of the heat-fusible core material is incorporated therein, the thermoplastic resin having a mechanical loss tangent (tan .delta.) in the range of from 1.0 to 20.0 based on a dynamic viscoelasticity, when measured with a sine stress having an angular frequency of 25 rad/s at a temperature of from 80.degree. to 120.degree. C. By using the encapsulated toner, good offset resistance can be obtained in the resulting toner even when its fixing speed is slow. Also, the core material is likely to be released from the encapsulated toner upon fixing while retaining good blocking resistance and good shocking resistance.

Encapsulated toner for heat-and-pressure fixing and method for producing

A method for producing an encapsulated toner for heat-and-pressure fixing, which has a heat-fusible core material containing at least a thermoplastic resin and a coloring agent and a shell formed thereon so as to cover the surface of the core material, having the steps of coating the surface of the core material with a hydrophilic shell-forming material to form precursor particles; adding at least a vinyl polymerizable monomer and an initiator for vinyl polymerization to an aqueous suspension of the precursor particles to absorb them into the precursor particles; and then polymerizing the monomer components in the precursor particles. The method of the present invention offers toners which not only have improved storage stability but also are excellent in offset resistance, fixable at a low temperature and are further capable of forming clear images free from background.

Encapsulated toner for heat - and pressure - fixing and method for

A method of forming fixed images including uniformly charging a photoconductor, selectively exposing the photoconductor to light to form an electrostatic latent image, developing the electrostatic latent image with a thermally dissociating encapsulated toner to form a visible image, transferring the formed toner image to a recording medium, and fixing the transferred the toner image onto the recording medium, the fixing process being carried out at a temperature of not less than 40.degree. C. and not more than 120.degree. C. and by using a fixing roller exerting a nip pressure of less than 4 kg/cm.

Method of forming fixed images using encapsulated toner

Method of forming fixed images

The present invention is directed to a developing method of a magnetic encapsulated toner, which can be fixed even at a nip pressure of 0.01 to 0.1 kg/cm without a supply of silicone oil onto a surface of a heat roller, using a toner projection developing device. The fixing in the present invention is carried out at a temperature of not more than 120.degree. C. and at a nip pressure of 0.01 to 4 kg/cm. By using these methods, the miniaturization of the overall apparatus can be achieved.

Developing method and method for forming fixed images using magnetic

Method of forming fixed images using heated belt

A method of forming fixed images includes charging a photoconductor; exposing the photoconductor to light; applying a thermally dissociating encapsulated toner, or an encapsulated toner whose shell is made of amorphous polyester to an electrostatic latent image formed on the photoconductor, developing the electrostatic latent image to form a visible image; transferring the formed visible image to a recording medium having a softening point of 100.degree. C. to 200.degree. C.; and fixing the transferred visible image onto the recording medium at a temperature of not less than 80.degree. C. and not more than 120.degree. C. by using a fixing roller which exerts a nip pressure of from 0.1 to 4.0 kg/cm.

The present invention is directed to an encapsulated toner for heat-and-pressure fixing, which has a heat-fusible core material containing at least a coloring agent and a shell formed thereon so as to cover the surface of the core material. The core material includes a thermoplastic resin as its main components produced by a polymerization reaction, at the time of encapsulation, of 0.05 to 20 parts by weight of the (A) .alpha.,.beta.-ethylenic copolymerizable monomer having an acid anhydride group and 99.95 to 80 parts by weight of the (B) other .alpha.,.beta.-ethylenic copolymerizable monomer. Alternatively, the core material contains a copolymer having one or more acid anhydride groups added as one component of the core material resin-constituting material at the time of encapsulation.

Growing community of inventors

Wakayama, Japan

Mitsuhiro Sasaki