Abstract: Provided are a polychloroprene latex giving a rubber-asphalt composition superior in low-temperature stability and film-forming property on the material to be coated, a rubber-asphalt composition and a utilization method thereof, a sheet, and a waterproof coating film. The rubber-asphalt composition includes a major agent containing 10 to 40 mass % of the anionic polychloroprene latex comprising potassium ions in an amount of 0.7 to 1.5 parts by mass and sodium ions in an amount of controlled to be 0.2 part by mass or less with respect to 100 parts by mass of the solid matter and 60 to 90 mass % of an anionic asphalt emulsion; and a coagulating agent of an aqueous solution containing a polyvalent metal salt as the principal component.

Abstract: Provided is an optical system, which retains enhanced optical performance at any object distance, and has compact and light-weight focus lens units. Provided is an optical system including a plurality of lens units, in which an interval between adjacent lens units changes during focusing, the optical system including: a positive lens unit arranged closest to an object side; first and second focus lens units having negative refractive powers configured to move during focusing; and an intermediate lens unit having a positive refractive power and arranged between the first and second focus lens units. The first and second focus lens units are configured to move toward an image side during focusing.

Abstract: Disclosed is a structure for a front part of a vehicle body including a front sidemember that extends in a longitudinal direction of a vehicle; a bumper reinforcement, at least a part of which is positioned at the same height as the front sidemember in a vertical direction of the vehicle, and extends in a lateral direction of the vehicle so as to face the front sidemember; and a support portion. The end portion of the bumper reinforcement has an extension portion that extends in the lateral direction of the vehicle up to a position which overlaps a wheel when seen from the longitudinal direction of the vehicle. At least a front surface of the bumper reinforcement in the longitudinal direction of the vehicle and the extension portion have strength higher than that of other portions of the bumper reinforcement.

Abstract: The present invention provides a framework member by which the amount of impact absorption can be sufficiently ensured. The framework member is a framework member that is extended in a front and rear direction of a vehicle in a front portion of the vehicle. A plurality of deformation-inducing portions, in which deformations are induced by a load exerted from a front of the vehicle, are formed at points in the framework member along the front and rear direction of the vehicle. The plurality of deformation-inducing portions are alternately formed on an outer side and an inner side of the framework member along the front and rear direction of the vehicle. The closer the deformation-inducting portion is positioned to a rear of the vehicle, the greater a distance between the deformation-inducing portions becomes.

Abstract: To provide a vehicle-body side part structure that can achieve both weight reduction and collision performance. A side sill 3 is constituted of an outer panel 11, an inner panel 12 located on the inside of the outer panel 11 in the vehicle width direction, and a backup panel 13 located on the inside of the inner panel 12 in the vehicle width direction. A backup panel central bulging portion 50 bulging inward in the vehicle width direction is formed in a central portion in the vehicle longitudinal direction of the backup panel 13, an outer panel bead central portion 22 recessed inward in the vehicle width direction is formed in the outer panel 11, and an inner panel bead central portion 39 recessed outward in the vehicle width direction is formed in the inner panel 12 to increase the rigidity in the vehicle width direction.

Abstract: A front structure of a vehicle body includes a first bumper reinforcement extending in a lateral direction of the vehicle body. A second bumper reinforcement extends in the lateral direction of the vehicle body below the first bumper reinforcement. Two first crash boxes are coupled to the two ends of the first bumper reinforcement. Two second crash boxes are coupled to the two ends of the second bumper reinforcement. Two vertical posts are coupled to the rear ends of the first and second crash boxes. Two side frames are coupled to the two vertical posts opposite to the first crash boxes. Two lower members are coupled to the two vertical posts opposite to the second crash boxes. A lower support member couples the second crash boxes to each other and forms a lower portion of a radiator support.

Abstract: A vehicle underbody structure includes a floor panel that is provided to extend in a longitudinal direction of a vehicle body; a pair of rockers that are respectively provided along both side portions of the floor panel in the vehicle body to extend in the longitudinal direction of the vehicle body; and a cross member that is mounted in a bridging manner between the pair of rockers to be apart from a floor surface of the floor panel, and that has strength greater than that of the rocker.

Abstract: A vehicle body impact absorption structure includes a bumper reinforcement, an upper vehicle body frame member, a lower vehicle body frame member, and an impact absorption box. The impact absorption box includes a rear portion, which is connected to the upper and lower vehicle body frame members, and a front portion, which is connected to the bumper reinforcement. The impact absorption box includes an upper impact absorption portion, which has a closed cross-section, a lower impact absorption portion, which has a closed cross-section, a front connection portion, which has a closed section, and a communication portion. The front connection portion connects the upper and lower impact absorption portions. The communication portion is located at the rear side of the front connection portion. The communication portion includes an opening extending through the impact absorption box in the lateral direction of the vehicle body.

Abstract: A vehicle body frame member has an impact absorbing portion, which is shaped like a rectangular tube and has four side walls and a tube axis. At least one of the four side walls has a row of protrusions configured by an odd number of protrusions aligned in the direction of the tube axis. Each of the protrusions protrudes outward in a radial direction of the impact absorbing portion and extends along the side wall in a direction perpendicular to the tube axis. The protruding amount of the even-numbered protrusions is greater than the protruding amount of the odd-numbered protrusions.

Abstract: A vehicle body rocker structure includes a plate-like inner member and a plate-like outer member that extend in a vehicle backward-forward direction and join with each other in a vehicle width direction as a structure member for constituting a rocker, wherein respective cross-sections of the inner member and the outer member include upper joint portions, lower joint portions, at least one convex portion caused to project to opposite sides joining therebetween, and concave portions disposed between the upper and lower joint portions as well as on a vehicle body upper and lower side of the convex portions, respectively, and the upper joint portions, the lower joint portions, and the convex portions of the inner member and the outer member are joined with each other, respectively and plural closed cross-sections are formed in the vehicle body up-down direction.

Abstract: Disclosed is a structure for a front part of a vehicle body including a front sidemember that extends in a longitudinal direction of a vehicle; a bumper reinforcement, at least a part of which is positioned at the same height as the front sidemember in a vertical direction of the vehicle, and extends in a lateral direction of the vehicle so as to face the front sidemember; and a support portion. The end portion of the bumper reinforcement has an extension portion that extends in the lateral direction of the vehicle up to a position which overlaps a wheel when seen from the longitudinal direction of the vehicle. At least a front surface of the bumper reinforcement in the longitudinal direction of the vehicle and the extension portion have strength higher than that of other portions of the bumper reinforcement.

Abstract: A vehicle pillar structure includes a reinforcement that is provided in a vehicle pillar and that includes a buckling portion and a strain reducing face portion, wherein the buckling portion serves as a starting point of buckling; and the strain reducing face portion is adjacent to the buckling portion in a lateral direction of the reinforcement and reduces strain that occurs when the buckling.

Abstract: To provide a vehicle-body side part structure that can achieve both weight reduction and collision performance. A side sill 3 is constituted of an outer panel 11, an inner panel 12 located on the inside of the outer panel 11 in the vehicle width direction, and a backup panel 13 located on the inside of the inner panel 12 in the vehicle width direction. A backup panel central bulging portion 50 bulging inward in the vehicle width direction is formed in a central portion in the vehicle longitudinal direction of the backup panel 13, an outer panel bead central portion 22 recessed inward in the vehicle width direction is formed in the outer panel 11, and an inner panel bead central portion 39 recessed outward in the vehicle width direction is formed in the inner panel 12 to increase the rigidity in the vehicle width direction.

Abstract: Provided is a method for evaluating of the chemical stability of a polychloroprene latex that permits evaluation of the chemical stability of polychloroprene at high accuracy. First, an aqueous calcium hydroxide or calcium nitrate solution at a concentration of 0.05 to 0.40 mass % is added to a polychloroprene latex having a solid matter concentration of 45 to 65 mass %. The generated precipitate is then collected by filtration and the dry mass is determined, and the precipitation rate (%) is calculated according to the following Formula (I). Precipitation ? ? rate ? ? ( % ) = A { B × ( C ? / ? 100 ) } × 100 ( I ) (wherein, A represents the dry mass (g) of the precipitate; B represents the mass (g) of the polychloroprene latex, and C represents the solid matter concentration (mass %) of the polychloroprene latex.

Abstract: A vehicle underbody structure includes a floor panel that is provided to extend in a longitudinal direction of a vehicle body; a pair of rockers that are respectively provided along both side portions of the floor panel in the vehicle body to extend in the longitudinal direction of the vehicle body; and a cross member that is mounted in a bridging manner between the pair of rockers to be apart from a floor surface of the floor panel, and that has strength greater than that of the rocker.

Abstract: The present invention provides a framework member by which the amount of impact absorption can be sufficiently ensured. The framework member is a framework member that is extended in a front and rear direction of a vehicle in a front portion of the vehicle. A plurality of deformation-inducing portions, in which deformations are induced by a load exerted from a front of the vehicle, are formed at points in the framework member along the front and rear direction of the vehicle. The plurality of deformation-inducing portions are alternately formed on an outer side and an inner side of the framework member along the front and rear direction of the vehicle. The closer the deformation-inducting portion is positioned to a rear of the vehicle, the greater a distance between the deformation-inducing portions becomes.

Abstract: A floor member includes a floor member front arranged at a front side and a floor member rear arranged at a rear side. A member rear upper is mounted on the floor member front. The floor member front and the floor member rear respectively have a front upper bead and a rear lower bead that extend in a longitudinal direction of a vehicle.

Abstract: There is provided a shock absorbing structure that can improve shock absorption performance by stabilizing the compressive deformation of a shock absorbing member in an axial direction. High-strength portions controlling deformation and low-strength portions controlling deformation are alternately disposed. Accordingly, when a shock is applied to a front side member from the front side of a vehicle, the front side member can be deformed in the shape of a bellows. Further, the respective low-strength portions, which are disposed closer to a rear end side in a longitudinal direction, have higher strength. Therefore, the front side member can be sequentially deformed from a front end side.

Abstract: Provided is a polychloroprene latex that shows favorable low-temperature stability without deterioration in the rubber agglutinating property during production of the dip-molded article, a rubber composition, and a dip-molded article, prepared by using the same. Prepared is a polychloroprene latex of a chloroprene copolymer obtained by polymerization of raw monomers at least containing chloroprene and 2,3-dichloro-1,3-butadiene, which is dispersed in water, wherein the 2,3-dichloro-1,3-butadiene content in the raw monomers is controlled to 1 to 30 mass % and the potassium ion content is adjusted to 0.7 to 1.5 parts by mass and the sodium ion content to 0.2 part or less by mass with respect to 100 parts by mass of the solid matter. In addition, a metal oxide: 1 to 10 parts by mass, sulfur: 0.1 to 3 parts by mass, an aging inhibitor: 0.1 to 5 parts by mass and a surfactant: 0.

Abstract: Provided is a method for evaluating of the chemical stability of a polychloroprene latex that permits evaluation of the chemical stability of polychloroprene at high accuracy. First, an aqueous calcium hydroxide or calcium nitrate solution at a concentration of 0.05 to 0.40 mass % is added to a polychloroprene latex having a solid matter concentration of 45 to 65 mass %. The generated precipitate is then collected by filtration and the dry mass is determined, and the precipitation rate (%) is calculated according to the following Formula (I). Precipitation ? ? rate ? ? ( % ) = A { B × ( C ? / ? 100 ) } × 100 ( I ) (wherein, A represents the dry mass (g) of the precipitate; B represents the mass (g) of the polychloroprene latex, and C represents the solid matter concentration (mass %) of the polychloroprene latex.