Abstract: A film-like graphite that satisfies the following condition (1) or condition (2) described below. Condition (1): a graphite crystal orientation degree P is 96% or more with respect to a film plane. Condition (2): a graphite crystal orientation degree P is 94% or more with respect to a film plane and a thickness is 42 ?m or more.

Abstract: A method for producing a carbon material, the method including a step of performing a carbonization treatment by heating an organic polymer material to a temperature higher than 400° C. in a non-oxidizing atmosphere containing a gaseous substance (A) composed of at least one of acetylene and an acetylene derivative.

Abstract: Obtained is a polypropylene fiber that selectively satisfies any of the following requirements: the degree of amorphous orientation being not lower than 85%; the degree of crystalline orientation being not lower than 90%; the degree of crystallinity being 60-75%; the strength being not lower than 7 cN/dtex; the initial elastic modulus being not lower than 100 cN/dtex; the rupture elongation being 10-30%; and the single fiber fineness being 3-20 dtex. This polypropylene fiber, in which a crystalline chain and an amorphous chain are highly oriented and that has high strength and high initial elastic modulus, is produced through a two-stage drawing method and by controlling the drawing tension of the final stage while maintaining production speed.

Abstract: An object of the present invention is to provide a polyolefin fiber, particularly a core-sheath composite polypropylene fiber which is possible to be easily deformed corresponding to a stress applied from a direction perpendicular to a fiber axis, to be less fibrillated, and to have an excellent knot strength. The problem of the present invention is solved by providing the polyolefin fiber having a compressive strength of 30 to 51 MPa calculated by the following formula 1 when compressed and deformed by 30% with respect to a fiber diameter in a direction perpendicular to the fiber axis in each single fiber.

Abstract: Obtained is a polypropylene fiber that selectively satisfies any of the following requirements: the degree of amorphous orientation being not lower than 85%; the degree of crystalline orientation being not lower than 90%; the degree of crystallinity being 60-75%; the strength being not lower than 7 cN/dtex; the initial elastic modulus being not lower than 100 cN/dtex; the rupture elongation being 10-30%; and the single fiber fineness being 3-20 dtex. This polypropylene fiber, in which a crystalline chain and an amorphous chain are highly oriented and that has high strength and high initial elastic modulus, is produced through a two-stage drawing method and by controlling the drawing tension of the final stage while maintaining production speed.

Abstract: A method for producing a carbon material, the method including a step of performing a carbonization treatment by heating an organic polymer material to a temperature higher than 400° C. in a non-oxidizing atmosphere containing a gaseous substance (A) composed of at least one of acetylene and an acetylene derivative.

Abstract: A resin composition for a light guide article-preform is described, which enables the formation of a foamed layer having a large light scattering effect on the surface of a shaped article by laser irradiation processing at low cost. More specifically, the present invention relates to: a resin composition for a light guide article-preform, which contains a resin having a mass average molecular weight of 60,000 to 150,000, and has a 30% thermal mass reduction temperature of 310° C. or lower and a difference between a 40% thermal mass reduction temperature and a 20% thermal mass reduction temperature of 7° C. or less when a thermal mass measurement is performed with starting from the state at 100° C. under air at a temperature rising rate of 5° C./min.

Abstract: A resin composition for a light guide article-preform is described, which enables the formation of a foamed layer having a large light scattering effect on the surface of a shaped article by laser irradiation processing at low cost. More specifically, the present invention relates to: a resin composition for a light guide article-preform, which contains a resin having a mass average molecular weight of 60,000 to 150,000, and has a 30% thermal mass reduction temperature of 310° C. or lower and a difference between a 40% thermal mass reduction temperature and a 20% thermal mass reduction temperature of 7° C. or less when a thermal mass measurement is performed with starting from the state at 100° C. under air at a temperature rising rate of 5° C./min.

Abstract: Provided is an acrylic film for punching excellent in transparency and free from breakage or whitening even if it is punched. The present invention is an acrylic film for punching containing a polymer (C) containing a di(meth)acrylate (A) unit represented by general formula (1) below and a mono(meth)acrylate (B) unit: —CH2—CR1—COO—(X)n—COCR1—CH2—??(1) wherein (X) represents at least one repeat unit selected from C2H4O, C3H6O and C4H8O; the molecular weight of (X)n is 500 or more; and R1 represents H or CH3.

Abstract: Provided is an acrylic film for punching excellent in transparency and free from breakage or whitening even if it is punched. The present invention is an acrylic film for punching containing a polymer (C) containing a di(meth)acrylate (A) unit represented by general formula (1) below and a mono(meth)acrylate (B) unit: —CH2—CR1—COO—(X)n—COCR1—CH2—??(1) wherein (X) represents at least one repeat unit selected from C2H4O, C3H6O and C4H8O; the molecular weight of (X)n is 500 or more; and R1 represents H or CH3.

Abstract: A high quality surface light source in which various kinds of unevenness in luminance due to use of small number of spot-like primary light sources for reducing power consumption is eliminated, and a light guide for use therein. The planar light guide (4) guides light emitted from a plurality of spot-like primary light sources (2) and has an incoming end face (41) of lights emitted from the primary light source (2) and an outgoing face (43) of guided light. A high light diffusion region (431) extends substantially along the direction of directivity of light entering the light guide (4) in a plane extending along the outgoing face (43), in the vicinity of the incoming end face of at least one of the outgoing face (43) and its rear surface (44) on the opposite side. The high light diffusion region (431) has a mean inclination angle larger than that of an adjacent region (434).

Abstract: A plate-shaped light guide for a planar light source device that guides a light emitted from a primary light source includes a light incident end face, a light emitting face and a back surface on the opposite to the light emitting face, wherein a plurality of first elongated lenses having an average slant angle of 0.5 to 60° are continuously or intermittently formed on one of the light emitting face and the back surface, and at least a portion of a surface of each first elongated lens, or at least a portion of the other one of the light emitting face and the back surface, or at least the portion of the surface of each first elongated lens and at least the portion of the other one of the light emitting face and the back surface includes a rough surface having an average slant angle of 0.1 to 8°.

Abstract: An actinic-energy-ray-curable resin composition (10) is supplied to the nip between a roll-shaped die (7) obtained by subjecting the peripheral surface of a roll-shaped metal member to blasting to thereby form a finely roughened structure and a filmy light-transmitting substrate (9) disposed along the peripheral surface of the roll-shaped die (7), thereby forming the actinic-energy-ray-curable resin composition (10) into a thin film. The finely roughened structure in the peripheral surface of the roll-shaped die (7) is transferred to a surface of the thin film. This actinic-energy-ray-curable resin composition (10) is cured to form a light-transmitting thin film. This film is bonded to the surface of the light-transmitting substrate (9) to obtain an antiglare film. That surface of the light-transmitting thin film which has the finely roughened structure has an arithmetic average inclination angle of 0.5-3.5 degrees.

Abstract: A planar light source device has a primary light source (1), a light guide (3) having a light incident surface (31) on which light emitted from the primary light source (1) is incident and a light emitting surface (33) for emitting light guided in the light guide, and a light deflector (4) opposed to the light emitting surface of the light guide. The light deflector (4) has a light input surface (41) to which light is inputted and a light output surface (42) which is disposed on the opposite side of the light input surface and outputs the inputted light. Elongated prisms each having two prism faces are arranged in parallel to each other on the light input surface (41). At least one of the two prism faces is a non-single planar surface. The vertex split angle ? of one of the prism faces is 2 to 25 degrees, and the vertex split angle ? of the other prism face is 33 to 40 degrees. The difference (|???|) between the vertex split angle ? and the vertex split angle ? is 8 to 35 degrees.

Abstract: A prism sheet provided with an elongated prism formed surface (41) on which a plurality of elongated prisms (411) extend in parallel to each other. The elongated prism formed surface (41) has roughened portions (412) each having a width W 0.04 to 0.5 times the arranging pitch P of the elongated prisms and arranged between adjacent elongated prisms (411). The surface of the roughened portion (412) has a center-line average roughness Ra of 0.3-2 ?m and a ten-point average roughness Rz of 1-3 ?m, and the prism surface (411a, 411b) of elongated prism has a center-line average roughness Ra of less than 0.3 ?m and a ten-point average roughness Rz of less than 1 ?m.

Abstract: An optical deflector element has a light incoming surface (41) in which light enters and a light outgoing surface (42) located opposite the light incoming surface and from which light exits. In the light incoming surface (41) are arranged elongated prisms (41A) in parallel to each other. Each of the elongated prisms (41A) is formed by a top end flat face (46) located at the top end of the elongated prism and having an inclination angle (b) of 1 to 50 degrees, a first prism face (44) located at one side of the flat face, and a second prism face (45) at the other side. A light source device is formed by combining the optical deflector element, light guide and a primary light source. The light guide has a light incident face in which light emitted from the primary light source enters, and a light emitting face from which guided light exits.

Abstract: [The present invention provides] a light source device comprising: a light conductor which has a first light incident end surface, a second light incident end surface and a light emitting surface; a first primary light source and a second primary light source which are disposed respectively adjacent to the first light incident end surface and second light incident end surface; and a light deflecting element which has a light incident surface disposed facing the light emitting surface and a light emitting surface, wherein a directional light emitting functional part with an average inclination angle of 0.5 to 15° is formed on at least one surface of the light conductor, i.e.

Abstract: A planar light guide (4) having a light entrance end face (41) receiving light from a spot-like primary light source and a light exit face (43) outputting the entered light, wherein a plurality of lens arrays (42) are formed, at least a part of the light entrance end face, to extend from the light exit face toward the opposite face substantially in parallel with each other. The lens array (42) has an asymmetric cross-sectional shape defined by a combination of at least two different curves. When the light guide (4) is combined with a primary light source disposed oppositely to the light entrance end face (41) and a light deflecting element disposed oppositely to the-light exit face (43), a high quality planar light source having a high uniformity and no variation in luminance is provided even when a relative small number of spot-like light sources are used as the primary light source.

Abstract: An area light source comprising an LED primary light source (2), a plate-like light guide (4) and a light deflector (6) is provided with a direct light incoming prevention means closed of a light-blocking member (9). The light guide (4) has a light incoming end face (41) and a light outgoing face (43) and guides a light emitted from the LED primary light source (2). The light deflector (6) is arranged adjacently to the light outgoing face (43) and has a light entering face (61) and a light exiting face (62). The direct light incoming prevention means prevents a light, which is emitted from the LED primary light source (2), from entering into the light deflector (6) without passing through the light guide (4). The light-blocking deflector (9) is disposed on a first region of the light outgoing face (43) which is located near the edge of the light incoming end face side of the light outgoing face (4).

Abstract: A plate-shaped light guide for a planar light source device that guides a light emitted from a primary light source includes a light incident end face, a light emitting face and a back surface on the opposite to the light emitting face, wherein a plurality of first elongated lenses having an average slant angle of 0.5 to 60° are continuously or intermittently formed on one of the light emitting face and the back surface, and at least a portion of a surface of each first elongated lens, or at least a portion of the other one of the light emitting face and the back surface, or at least the portion of the surface of each first elongated lens and at least the portion of the other one of the light emitting face and the back surface includes a rough surface having an average slant angle of 0.1 to 80°.