Abstract: A laminated gasket (13) to be used for a medical syringe is provided, which includes a main body (14) made of an elastic material, and a film (15) provided on a surface of the main body (14). The gasket (13) has a circumferential surface portion (17) to be brought into contact with an inner peripheral surface (16) of a syringe barrel (11) of the syringe. The gasket (13) further includes a projection (22) provided on a surface portion of the film (15) present in the circumferential surface portion (17) as extending circumferentially of the gasket. The projection (22) has a height of not less than 15 ?m and not greater than 55 ?m and a width of not less than 30 ?m and not greater than 75 ?m. With this arrangement, the laminated gasket is excellent in sealability.

Abstract: A medical rubber closure according to the present invention includes a disc-shaped flange portion and a leg portion formed to be continuous to a lower surface side of the flange portion, and a region at the lower surface side of the flange portion and the leg portion are made of a nitrile based rubber, a region at a top surface side of the flange portion is made of a butyl based rubber, and the leg portion is laminated with a coating layer made of a fluorine based resin film.

Abstract: A laminated gasket (13) to be used for a medical syringe is provided, which includes a main body (14) made of an elastic material, and a film (15) provided on a surface of the main body (14). The gasket (13) has a circumferential surface portion (17) to be brought into contact with an inner peripheral surface (16) of a syringe barrel (11) of the syringe. The gasket (13) further includes a projection (22) provided on a surface portion of the film (15) present in the circumferential surface portion (17) as extending circumferentially of the gasket. The projection (22) has a height of not less than 15 ?m and not greater than 55 ?m and a width of not less than 30 ?m and not greater than 75 ?m. With this arrangement, the laminated gasket is excellent in sealability.

Abstract: The present invention aims to provide a medical rubber stopper that is excellent in chemical resistance and airtightness while having good productivity. The present invention relates to a medical rubber stopper including: a disk-shaped head portion with a flange region; and a cylindrical leg portion protruding from the lower surface of the head portion and having a smaller diameter than the head portion, the lower surface of the flange region and the leg portion being laminated with an inert film, the lower surface of the flange region and/or the outer periphery of the leg portion being provided with an annular groove through which the base rubber is exposed.

Abstract: A gasket is provided, which is laminated with an inert resin film and has a reduced sliding resistance and a higher liquid sealability. The gasket (10) is used for a medical syringe (30), and includes a main body (11) made of an elastic material and an inert resin film (12) provided on a surface of the main body (11). The gasket (10) has a short cylindrical shape, and includes a plurality of annular ribs (13, 14, 15) provided on an outer circumferential surface (20) thereof and each having a sliding contact portion (16) to be kept in sliding contact with an inner peripheral surface of a syringe barrel. The plurality of annular ribs are axially arranged from a distal end to a rear end of the gasket (10). The sliding contact portion (16) of a distal annular rib (13) has a width that is 1 to 25% of a length of the outer circumferential surface (20) of the cylindrical gasket as measured axially of the gasket.

Abstract: The present invention provides, medical rubber parts that do not physically and chemically affect the quality of preparations. The present invention relates to a medical rubber part obtained by press-molding an unvulcanized rubber mainly containing a rubber for forming a liquid-contacting portion and an unvulcanized rubber mainly containing a butyl-based rubber for forming a non-liquid-contacting portion, wherein a color difference dE between the liquid-contacting portion and the non-liquid-contacting portion is 6.0 or more in NBS units.

Abstract: A medical rubber closure according to the present invention includes a disc-shaped flange portion and a leg portion formed to be continuous to a lower surface side of the flange portion, and a region at the lower surface side of the flange portion and the leg portion are made of a nitrile based rubber, a region at a top surface side of the flange portion is made of a butyl based rubber, and the leg portion is laminated with a coating layer made of a fluorine based resin film.

Abstract: A medical rubber part according to the present invention comprises a rubber composition including at least one type of rubber component, selected from the group consisting of butyl rubbers and halogenated butyl rubbers, and not less than 3 parts by mass and not more than 50 parts by mass, with respect to 100 parts by mass of the total amount of the rubber component, of silica with a BET specific surface area of not less than 1 m2/g and not more than 60 m2/g and a bulk specific gravity of not less than 30 g/liter and not more than 130 g/liter.

Abstract: The present invention provides, medical rubber parts that do not physically and chemically affect the quality of preparations. The present invention relates to a medical rubber part obtained by press-molding an unvulcanized rubber mainly containing a rubber for forming a liquid-contacting portion and an unvulcanized rubber mainly containing a butyl-based rubber for forming a non-liquid-contacting portion, wherein a color difference dE between the liquid-contacting portion and the non-liquid-contacting portion is 6.0 or more in NBS units.