Teijin Limited

Takuro Kitamura

Kazunari Kosaka

Yasuyuki Kondo

Shinichiro Shoji

Takeshi Matsuda

Masaki Mitsunaga

Yuichi Matsuno

Masatsugu Furuki

Jitsuo Oda

Yoshitaka Shibata

The present invention provides a method for producing a molded article by pressing a composite material containing a resin composition and carbon fibers, wherein the resin composition contains a polyamide resin, a copper compound and potassium halide, and (1) the copper compound content is 0.1 parts by mass or more relative to 100 parts by mass of the polyamide resin.

Method for producing molded article

Disclosed is a method for manufacturing a composite material, which includes performing press molding of a fiber matrix structure including reinforcing fibers and a matrix resin mainly including a polyester-based resin having a crystallization temperature of 185&#xb0; C. or lower. Furthermore, the polyester-based resin is preferably a polyester-based copolymer. In addition, it is preferred that the matrix resin includes a carbodiimide, and that the carbodiimide has a cyclic structure. Moreover, it is preferred that the press molding is cold pressing in which a die temperature is 170&#xb0; C. or lower; that the reinforcing fibers are carbon fibers; and that the discontinuous fibers are randomly oriented in the structure.

Method for manufacturing composite material

A resin composition which comprises polylactic acid, does not release an isocyanate group at the time of production and has excellent hydrolysis resistance and a low environmental burden. The resin composition comprises:

Polylactic acid composition

A fiber-reinforced composite material obtained by reinforcing a matrix resin with fibers, wherein the matrix resin contains a thermoplastic resin and a carbon black, the fibers are discontinuous carbon fibers, a part of the discontinuous carbon fibers forms fiber bundles, and the thickness of a thinnest part of the matrix resin which is located between an outermost surface of the composite material and the fibers existing in an inside of the composite material is less than 100 &#x3bc;m. Further, it is preferred that the thermoplastic resin is a polyamide-based resin, that the discontinuous carbon fibers have a length of from 3 to 100 mm, and that the orientation of the discontinuous carbon fibers is random. Furthermore, it is preferred that the size of the primary particle diameter of the carbon black is within a range of 7 to 75 nm.

Growing community of inventors

Tokyo, Japan

Takuro Kitamura