Daicel Polymer Ltd.

Toshio Oguni

Masahiko Itakura

Shigeyuki Kousaka

Hiroshi Sagane

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 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.

A resin composition comprises 1 to 60 parts by weight of a wollastonite fiber (in which the number-average fiber length is 1 to 30 &#x3bc;m, the number-average fiber diameter is 0.1 to 10 &#x3bc;m, and the proportion of the number of a fiber having a fiber length of 5 to 25 &#x3bc;m relative to the total number of the fiber is 20 to 75%) and 0.1 to 20 parts by weight of an acid- or epoxy-modified olefinic resin having a melting point of 100 to 170&#xb0; C., relative to 100 parts by weight of a thermoplastic resin (e.g., a polycarbonate-series resin). The weight-average molecular weight of the modified olefinic resin may be about 2.5&#xd7;10to 30&#xd7;10. The resin composition may comprise a flame retardant. The combination use of the wollastonite fiber and the modified olefinic resin improves heat resistance, impact resistance and weld strength, even in the case of using a wollastonite fiber having a number-average fiber diameter of about 4 to 7 &#x3bc;m and an average aspect ratio of about 1.5 to 3. The present invention provides a thermoplastic resin composition for improving the impact resistance, weld strength and surface property without deteriorating the heat resistance.

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Himeji, Japan

Toshio Oguni