Sumitomo Chemical Company, Limited

Teijin Fibers Limited

Katsuhisa Kitano

Yoshiaki Oobayashi

Kenji Atarashi

Takashi Sanada

Kenji Watanabe

Kazunori Teraoka

Shinichi Takahashi

A resin composition includes a fiber and a polyolefin resin and can provide a molded article having excellent mechanical strength such as flexural strength and impact resistance. The resin composition includes (i) a surface-treated fiber (A) which comprises 100 parts by weight of a fiber (A-I) comprising a polyalkylene terephthalate and/or a polyalkylene naphthalene dicarboxylate and 0.1 to 10 parts by weight of a sizing agent (A-II) adhered to the surface of the fiber (A-I), and (ii) a polyolefin resin modified with an unsaturated carboxylic acid and/or an unsaturated carboxylic acid derivative (a modified polyolefin resin (B)) as a resin component.

Surface-treated fiber, resin composition, and molded article of the composition

Disclosed is a composite material comprising: resin (I) comprising 10 to 99% by weight of a crystalline thermoplastic resin which is defined as component (A), and 1 to 90% by weight of a crystalline thermoplastic resin having a crystallization temperature lower than that of component (A) by at least 10&#xb0; C., which resin is defined as component (B), and 5 to 400 parts by weight, based on 100 parts by weight of the resin (I), of fiber, which is defined as component (C), wherein the contents of the component (A) and the component (B) are each based on a combined content of these two components.

Fiber-crystalline thermoplastic resin composite material and pellet thereof

Disclosed is a polyolefin resin composition comprising 100 parts by weight of component (A), 0.001 to 10 parts by weight of component (B) and 0.01 to 100 parts by weight of component (C):

Polyolefin resin composition

There is provided a process for producing a modified polypropylene resin, which comprises the steps of mixing the following components (A) to (D), and reacting them with one another:

Process for producing modified polypropylene resin

Disclosed is a fiber/resin composite comprising fibers (A), polypropylene resin (B) and modified polyolefin resin (C), the weight ratio of the polypropylene resin (B) to the modified polyolefin resin (C) being 99.9/0.1 to 60/40, the modified polyolefin resin (C) having a melt flow rate of 30 to 150 g/10 min, the fibers (A) being arranged parallel to each other in one direction, the composite having a length of 2 to 100 mm along the direction in which the fibers (A) are arranged, the fibers (A) having a weight average length equal to the length of the composite, wherein the polypropylene resin (B) is composed of propylene homopolymer segment (B- ) and propylene-ethylene copolymer segment (B- ), the propylene homopolymer segment (B- ) having an isotactic pentad fraction of at least 0.980 and the content of the propylene-ethylene copolymer segment (B- ) in the polypropylene resin (B) being 10 to 40% by weight.

Fiber/resin composite and molded article formed from the same

Disclosed is a fiber-reinforced polyolefin resin composite containing a polyolefin resin (components (A)), fibers (component (B)) and a heavy metal deactivator (component (C)), the ratio of the weight of component (A) to the weight of component (B), (component (A)/component (B)), being from 20/80 to 95/5, the ratio of the weight of component (C) to the combined weight of component (A) and component (B), (component (C)/&lsqb;component (A)&plus;component (B)&rsqb;), being from 0.001/100 to 5/100, wherein in the composite substantially all the component (B) have lengths of 2 mm or more. The composite has an improved durability under circumstances of contact with metal. A molded article obtained from the composite is also disclosed.

Growing community of inventors

Ichihara, Japan

Katsuhisa Kitano