Daicel-evonik Ltd.

Daicel Polymer Ltd.

Takayuki Uno

Mitsuteru Mutsuda

Yoshiki Nakaie

Masahiko Itakura

Masahiro Katayama

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) A reinforcing fiber, (B) a resin particle, and (C) a matrix resin are combined to prepare a resin composition which improves a reinforcing effect by the reinforcing fiber. The reinforcing fiber (A) contains a carbon fiber. The resin particle (B) contains a semicrystalline thermoplastic resin, the semicrystalline thermoplastic resin in the resin particle (B) has an exothermic peak in a temperature range between a glass transition temperature of the semicrystalline thermoplastic resin and a melting point of the semicrystalline thermoplastic resin, the peak being determined by heating the resin particle (B) at a rate of 10&#xb0; C./min. by differential scanning calorimetry (DSC), and the resin particle (B) has an average particle size of 3 to 40 &#x3bc;m. The semicrystalline thermoplastic resin may be a polyamide resin having a melting point of not lower than 150&#xb0; C. (particularly, a polyamide resin having an alicyclic structure and a glass transition temperature of not lower than 100&#xb0; C., or a polyamide resin having a &#x3b3;-type crystal structure or a degree of crystallinity of not more than 50%). The matrix resin (C) may be a thermosetting resin.

Fiber-reinforced resin, process for producing same, and molded article

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

Polyamide particles including polyamide and having a water absorption rate of 0.5 to 2.5 wt. % are prepared to improve toughness of a cured product of a curable resin. The polyamide may be a semicrystalline polyamide. The polyamide has a glass transition temperature of approximately 100 to 150&#xb0; C. The polyamide may have an alicyclic structure. The polyamide particles of this invention have an average particle size of approximately 5 to 40 &#x3bc;m and a specific surface area determined by the BET method of approximately 0.08 to 12 m/g. The polyamide particles of the present invention may also be spherical and have an average particle size of approximately 15 to 25 &#x3bc;m. Furthermore, the polyamide particles of the present invention may have an exothermic peak in a temperature range between the glass transition temperature and a melting point of the polyamide upon heating the polyamide particles at a rate of 10&#xb0; C./min by differential scanning calorimetry (DSC).

Growing community of inventors

Himeji, Japan

Takayuki Uno