Teijin Limited

Katsuyuki Hagihara

Naoaki Sonoda

Yuhei Konagai

Takeru Ohki

Takeshi Naito

Toru Kaneko

Masatomo Teshima

Makoto Ootsubo

Takashi Ito

Yukino Oosawa

Takeru Ooki

Kaori Nagakura

Masaru Sato

Jirou Sadanobu

Noboru Okimoto

There is provided a random mat including carbon fibers and a matrix resin, wherein the carbon fibers in the random mat have an average fiber length in a range of 3 mm to 100 mm, a fiber areal weight of the carbon fibers is 25 to 10,000 g/m, the carbon fibers include a specific carbon fiber bundles having a specific opening degree in a specific amount per the total carbon fibers, and the specific carbon fiber bundles with a thickness of 100 &#x3bc;m or more are included in a ratio of less than 3% of the number of the total specific carbon fiber bundles.

Random mat and fiber-reinforced composite material

There is provided a random mat including carbon fibers having an average fiber length of from 3 mm to 100 mm and a thermoplastic resin, wherein a fiber areal weight of the carbon fibers is from 25 to 10,000 g/m, a proportion of carbon fiber bundles (A) constituted by single carbon filaments of a critical single fiber number or more defined by the formula (1) to the total amount of fibers in the random mat is from 40 to 99 Vol %, and an average number (N) of fibers in the carbon fiber bundles (A) satisfies the formula (2):critical single fiber number=600/&#x2003;&#x2003;(1)2.0&#xd7;10&#x3c;8.0&#xd7;10&#x2003;&#x2003;(2)

Random mat, shaped product of fiber reinforced composite material, and carbon fiber mat

A random mat contains reinforcing fibers having an average fiber length of 3 to 100 mm and a thermoplastic resin, the reinforcing fiber contains reinforcing fiber bundle (A) defined as the bundle composed of the reinforcing fibers of a critical number of single fiber (defined by the following formula (1)) or more, an average thickness of the reinforcing fiber bundles (A) is 100 &#x3bc;m or less, and the number (n) of the reinforcing fiber bundles (A) per unit weight (g) of the reinforcing fibers satisfies the following formula (I): Critical number of single fiber=600/D (1) (wherein D is the average fiber diameter (&#x3bc;m) of the reinforcing fiber), and 0.65&#xd7;10/L&#x3c;N (I) (wherein L is the average fiber length (mm) of the reinforcing fiber).

Random mat and fiber-reinforced composite material shaped product

There is provided a fiber-reinforced composite material is constituted by reinforcing fibers with an average fiber length of 5 mm to 100 mm and a thermoplastic resin, in which in a viscoelastic characteristic that is defined by following formulas (1) and (2), an average value in a range of &#x2212;25&#xb0; C. of the melting point of a matrix resin to +25&#xb0; C. of the melting point of a matrix resin satisfies following formula (3):tan &#x3b4;=&#x2003;&#x2003;(1)tan &#x3b4;'=&#xd7;tan &#x3b4;/(100&#x2212;)&#x2003;&#x2003;(2)0.01&#x2266;tan &#x3b4;&#x2032;&#x2266;0.2&#x2003;&#x2003;(3)

Fiber-reinforced composite material

A method for manufacturing a reinforcing fiber strand is provided, in which a strand including reinforcing fibers passes through an uneven jig and a widening jig in this order, the uneven jig including a plurality of uneven portions having notched and protrusion portions, and the strand is divided by the protruding portions.

Method for manufacturing reinforcing fiber strand

There is provided a composite base material, including: carbon fibers having an average fiber length of 3 mm or more and 100 mm or less; and a thermoplastic resin is firmly fixed to the carbon fibers in an amount of 3 to 100 parts by mass with respect to 100 parts by mass of the carbon fibers, wherein a void ratio is more than 7 vol % to less than 100 vol %.

Composite base material

A carbon fiber bundle includes carbon fibers and a copolymerized polyolefin attached to the surface of the carbon fibers. The copolymerized polyolefin contains an aromatic vinyl compound and an acid and/or acid anhydride as copolymerization components. The amount of the copolymerized polyolefin attached is 0.01 to 10 parts by mass per 100 parts by mass of the carbon fiber bundle. The carbon fiber bundle may be used or contained in a random mat, a composite material, and various molded articles.

Carbon fiber bundle, method for producing the same, and molded article made thereof

There is provided a random mat of the present invention including: reinforcing fibers having an average fiber length of 5 to 100 mm; and a thermoplastic resin,

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Matsuyama, Japan

Katsuyuki Hagihara