Abstract: Propylene polymers and propylene resin compositions containing the polymers are used as molded articles used under stress for a long period such as automotive parts, housing parts, home appliance parts and electric power tool parts. Stress-resistant molded articles of the invention are obtained from these materials. A propylene homopolymer (A) satisfies the following requirements (1) to (3), and a polypropylene resin composition contains the propylene homopolymer (A). (1) The ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) according to GPC is in the range of 1.2 to 3.5. (2) Mn is in the range of 35,000 to 400,000. (3) The content of components soluble in o-dichlorobenzene at 90° C. is not more than 4 wt %.

Abstract: A carbon fiber-reinforced resin composition including (A) a polyolefin resin, (B) an acid-modified polyolefin resin and (C) modified carbon fibers of which the adhesion amount of an amino group-containing modified polylolefin resin is 0.2 to 5.0 mass %, wherein the mass ratio of (A):(B) is 0 to 99.5:100 to 0.5 and the mass ratio [(A)+(B)]:(C) is 40 to 97:60 to 3.

Abstract: An acid-modified polyolefin-based resin for glass fiber treatment having: (1) an amount of components extractable with boiling methyl ethyl ketone of 8 mass % or less; (2) a number average molecular weight (Mn), measured by gel permeation chromatography (GPC), of 6,000 to 48,000; and (3) an amount of an acid which has been added, measured by Fourier transform infrared spectroscopy, of 0.1 to 12 mass %.

Abstract: A carbon fiber-reinforced resin composition including (A) a polyolefin resin, (B) an acid-modified polyolefin resin and (C) modified carbon fibers of which the adhesion amount of an amino group-containing modified polylolefin resin is 0.2 to 5.0 mass %, wherein the mass ratio of (A):(B) is 0 to 99.5:100 to 0.5 and the mass ratio [(A)+(B)]:(C) is 40 to 97:60 to 3.

Abstract: The present invention relates to a carbon fiber bundle to which an amino group-containing modified polyolefin resin has applied, wherein the amount of applying amino group-containing modified polyolefin resin is 0.2 to 5.0% by mass. This carbon fiber bundle can be produced by applying 0.2 to 5.0% by mass of the amino group-containing modified polyolefin resin to the surface of the carbon fiber bundle. The present invention can exhibit excellent interface adhesion to a polyolefin resin, particularly to a polypropylene resin, and can provide a carbon fiber bundle useful for reinforcing the polyolefin resin and a method of producing the same.

Abstract: The propylene homopolymers and the polypropylene resin compositions containing the propylene homopolymers according to the present invention give molded articles excellent in vibration fatigue strength and creep properties. The molded articles are therefore suitably used as parts requiring reliability for a long period such as automotive parts and housing parts.

Abstract: A fiber-reinforced resin composition comprising: (A) a polyolefin-based resin; (B) glass fibers having (B1) an average diameter of 3 to 30 ?m and (B2) an average aspect ratio of 50 to 6000; and (C) an acid-modified polypropylene-based resin exhibiting (C1) a change in amount of acid added, measured by Fourier transform infrared spectroscopy, before and after being treated in methyl ethyl ketone at 70° C. for three hours of 0.8 mass % or less, and having (C2) a melt flow rate (load: 2.16 kg, temperature: 230° C.) of 20 to 2000 g/10 min; the composition containing the components (A) to (C) at such a ratio (mass ratio) that (B):[(A)+(C)]=5 to 80:95 to 20 and (A):(C)=0 to 99.5:100 to 0.5.

Abstract: An acid-modified polyolefin-based resin for glass fiber treatment having: (1) an amount of components extractable with boiling methyl ethyl ketone of 8 mass % or less; (2) a number average molecular weight (Mn), measured by gel permeation chromatography (GPC), of 6,000 to 48,000; and (3) an amount of an acid which has been added, measured by Fourier transform infrared spectroscopy, of 0.1 to 12 mass %.

Abstract: A polyolefin resin composition including the following (A), (B) and (C), or the following (A), (B), (C) and (D): (A) a polymer synthesized from an ?-olefin having 3 or more carbon atoms, (B) a modified propylene based polymer satisfying the following (1) to (4): (1) the content of polar group moieties resulting from a compound containing in the same molecule thereof an ethylenic double bond and a polar group is from 0.10 to 0.30 mmol/g, (2) the intrinsic viscosity ([?]A) measured at 135° C. in tetralin is from 0.8 to 3.0 dl/g, (3) the molecular weight distribution (Mw/Mn) is more than 2.5, and (4) the content of components having a molecular weight (Mw) of 10000 or less is 5% or less by weight, (C) an organized layer inorganic compound, and (D) a rubbery polymer.

Abstract: Disclosed are a flexible polypropylene resin suitable as thermoplastic elastomer, a propylene based elastomer composition containing the flexible polypropylene resin, and a process for producing the above flexible polypropylene resin and the propylene based elastomer composition. The above flexible polypropylene resin is composed of specific boiling heptane-soluble polypropylene and specific boiling heptane-insoluble polypropylene. The above propylene based elastomer composition comprises the above flexible polypropylene resin and an ethylene/propylene copolymer or an ethylene/propylene/polyene copolymer. The above process for the production of olefin polymers may be carried out by non-solvent polymerization methods such as a gas phase one-step polymerization method, and a gas phase multi-step polymerization method, using a specific catalyst.

Abstract: Disclosed are a flexible polypropylene resin suitable as thermoplastic elastomer, a propylene based elastomer composition containing the flexible polypropylene resin, and a process for producing the above flexible polypropylene resin and the propylene based elastomer composition. The above flexible polypropylene resin is composed of specific boiling heptane-soluble polypropylene and specific boiling heptane-insoluble polypropylene. The above propylene based elastomer composition comprises the above flexible polypropylene resin and an ethylene/propylene copolymer or an ethylene/propylene/polyene copolymer. The above process for the production of olefin polymers may be carried out by non-solvent polymerization methods such as a gas phase one-step polymerization method, and a gas phase multi-step polymerization method, using a specific catalyst.