Daicel Polymer Ltd.

Micro Co., Ltd.

Daicel Miraizu Ltd.

Masahiko Itakura

Takayuki Uno

Toshio Oguni

Masahiro Katayama

Kiyoshi Shimizu

Hiroshi Sagane

Shigeyuki Kousaka

Yuichi Oe

Norihisa Wada

Takehiko Shima

Hiromoto Sasaki

Provided are a rare earth magnet precursor having a roughened structure on a surface or a rare earth magnet molded body having a roughened structure on a surface, and a method for manufacturing the same. In the rare earth magnet precursor or the rare earth magnet molded body, recesses and protrusions are formed on the surface having the roughened structure, and the recesses and protrusions satisfy at least one of the following (a) to (c): (a) an arithmetic mean height (Sa) (ISO 25178) from 5 to 300 &#x3bc;m, (b) a maximum height (Sz) (ISO 25178) from 50 to 1500 &#x3bc;m, and (c) a developed interfacial area ratio (Sdr) (ISO 25178) from 0.3 to 12.

Rare earth magnet precursor or rare earth magnet molded body having roughened structure on surface and method for manufacturing same

A sealing method for sealing an opening of a metallic molded body with a resin molded body, the metallic molded body having a cavity therein and an opening connected to the cavity, includes a step of irradiating laser light onto a joining surface on a periphery of the opening of the metallic molded body in an energy density of 1 MW/cmor more and at an irradiation rate of 2000 mm/sec or more to roughen the surface, and a step of placing, in a mold, a portion including the joining surface of the metallic molded body roughened in the preceding step and sealing the opening with a resin molded body formed by injection molding or compression molding of a resin.

Sealing method

A fiber-reinforced resin composition contains a resin-adhered long fiber bundle including composition (A), a thermoplastic resin, and component (B), a rayon fiber, wherein the rayon fiber of component (B) satisfies the following requirements (b1), (b2) and (b3), and the resin-adhered long fiber bundle is obtained by adhering and integrating the thermoplastic resin of component (A) in a molten state to and with a strand of longitudinally-arranged rayon fibers of component (B), and cutting the strand into a length of 3 to 30 mm,

Fiber-reinforced resin composition

A method for roughening a surface of a metal molded body which can be used as an intermediate for manufacturing a composite molded body of a metal molded body with a resin, a rubber, a metal, or the like is provided. The method for roughening a metal molded body surface includes a step of irradiating the surface of the metal molded body with laser light at an irradiation rate of 2000 mm/sec or more with an energy density of 1 MW/cmor more using a laser apparatus, and the laser light irradiation step is a step of irradiating laser light so that laser light-irradiated portions and non-laser light-irradiated portions are generated alternately when the laser light is irradiated to be in a straight line, a curved line, or a combination of a straight line and a curved line on the surface of the metal molded body to be roughened.

Method for roughening metal molded body surface

A fiber-reinforced resin composition which is capable of providing a light-weight molded article that has a high mechanical strength. The fiber-reinforced resin composition contains (A) a thermoplastic resin and (B) resin-impregnated filament bundles containing rayon fibers. The rayon fibers of the component (B) have a fiber diameter of 5-30 &#x3bc;m and an X-ray orientation degree of 86% or more. The resin-impregnated filament bundles are obtained by: tying 2,000-30,000 rayon fibers of the component (B) lined up in the longitudinal direction together in a bundle; integrating the bundle of the rayon fibers by impregnating the bundle with the thermoplastic resin of the component (A) in a molten state; and then cutting the integrated bundle into pieces 3-30 mm long.

The present invention provides a direct liquid-writing instrument without ink leakage from the pen-tip even after a long period of use. Specifically, it provides a direct liquid-writing instrument having an ink-retaining part in a bellows-like shape, in which at least the ink-retaining part in a bellows-like shape is made of: 20 to 95% by mass of (A) a polyamide-based resin; and 80 to 5% by mass of (B) at least one resin selected from a styrene-based resin, an olefin-based resin, and a polyphenylene ether resin.

Direct liquid-writing instrument

The present invention provides a joining method using a method of laser welding wherein two resin molded bodies can be joined with high welding strength. Specifically, this is a method that joins two thermoplastic resin molded bodies using a method of laser welding; the first resin molded body is a laser light transmissive molded body comprising a thermoplastic resin and cellulose fibers with an &#x3b1;-cellulose content of 80% or more; the second resin molded body is a laser light absorbent molded body containing a thermoplastic resin and a colorant; and the first resin molded body and the second resin molded body are welded by irradiating laser light from the first resin molded body side.

Growing community of inventors

Tokyo, Japan

Masahiko Itakura