National Institute for Materials Science

Riso Kagaku Corporation

Mitsubishi Materials Corporation

Akiko Yamamoto

Shinji Tanaka

Keiichiro Oishi

Hidetoshi Somekawa

Toshiji Mukai

Sachiko Hiromoto

Norio Maruyama

Shinichiro Shimura

Toshihiro Endo

Junzo Tanaka

Yoshifumi Watanabe

Asayo Nishimura

Koichi Kita

Tetsuo Hosoya

Komei Kato

Junzo c/o Tokyo Institute Of Technology Tanaka

The present invention provides a surface treatment method that improves antimicrobial activity of copper or a copper alloy and enhances immediate effects of antimicrobial actions on the surface of the copper or the copper alloy. A surface treatment method for copper or a copper alloy according to the present invention comprises preparing a reducing agent solution containing a biological reducing substance, and treating the surface of the copper or the copper alloy with the reducing agent solution. The present invention also provides a surface treatment liquid for sterilizing copper or a copper alloy, in which the surface treatment liquid contains a biological reducing substance. The present invention also provides a sterilization method that comprises bringing copper or a copper alloy treated by the surface treatment method into contact with a surface of an object to sterilize the surface of the object.

Surface treatment method for copper or copper alloy, surface treatment liquid for sterilizing copper or copper alloy, and sterilization method using copper or copper alloy treated by said method

An oil-based inkjet ink set including two or more liquid compositions, for use with an inkjet head having two or more discharge port arrays, wherein at least one of the two or more liquid compositions is an oil-based inkjet ink, the initial boiling point of each of the two or more liquid compositions is, independently, 280&#xb0; C. or higher, and the difference in the specific gravities of any pair of liquid compositions in the two or more liquid compositions is at least 0.005 but not more than 0.012, is disclosed. A method for producing a printed item is also disclosed.

Oil-based inkjet ink set and method for producing printed item

A the non-aqueous pigment ink containing at least a non-aqueous solvent and a pigment that is self-dispersed in the solvent, wherein the self-dispersed pigment is treated with a compound represented by R1-X or R2-Y-R3, where X is any of &#x2014;SH, &#x2014;NCO, &#x2014;NH2 and &#x2014;NHR (where R is an alkyl group), Y is any of &#x2014;CO&#x2014;O&#x2014;O&#x2014;CO&#x2014; and &#x2014;CO&#x2014;O&#x2014;O&#x2014;, R1, R2 and R3 are alkyl groups with a carbon number of 8-22, the alkyl groups may be linear or branched, and R2 and R3 may be the same with or different from each other. Alternatively, the non-aqueous inkjet ink may contain at least a non-aqueous solvent and a pigment that is self-dispersed in the solvent, wherein a content of a polymer component in the ink is 20 mass % or less relative to the pigment, and the ink has a specific heat of 3.0 J/(g&#xb7;K) or less.

Non-aqueous pigment ink

A magnesium-based medical device which can adjust a degree of corrosion within a wide range of period such that the device can maintain a sufficient strength only during a desired period and disappears within a desired period thereafter and a manufacturing method thereof are provided. A magnesium-based medical device of the present invention is a magnesium-based medical device in which a base material is made of magnesium or a magnesium alloy, wherein a corrosion-resistant film is formed on a surface of the base material, and variation in surface hardness of the formed corrosion-resistant film in the in-plane direction is less than 21 in terms of a dispersion value of Vickers hardness.

Magnesium-based medical device and manufacturing method thereof

The invention provides a medical device in which a metallic porous body is joined to at least a part of a surface of the main body of a medical device, and a surface modification method for the medical device. The metallic porous body is formed in multilayers.

Medical device and surface modification method for medical device

A method of forming a dense image in non-aqueous inkjet composite printing wherein a black ink and at least one color ink are ejected in the same printing scan, comprising the step of:

Method of non-aqueous inkjet composite printing and ink set

As a novel biodegradable metallic material the degradation speed of which in vivo can be controlled over a broad scope while achieving desired mechanical properties such as strength, work hardening and ductility without restricting the shape of an implant device, it is intended to provide a magnesium-based biodegradable metallic material which comprises Mg containing Mg as the major composition and having a concentration of inevitable impurities equal to or less than 0.05 atomic %, is free from precipitates or intermetallic compounds, and has an average grain size being regulated to equal to or less than &#xbc; of the minimum part of the material.

Growing community of inventors

Ibaraki, Japan

Akiko Yamamoto