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US 12,006,391 B2Granted
Medical rubber composition, medical rubber part, and pre-fillable syringe
AssigneeSumitomo Rubber Industries, Ltd.
InventorsHirofumi Konishi, Toshikazu Kondo, Masayoshi Kashibe, Hideyuki Shigemoto
Life of this patent
Estimating the term…
Abstract
A medical rubber composition can contain, comprise, consist, or consist essentially of: (a) an isobutylene-isoprene rubber: (b) a diene-based rubber; and a silica having a BET specific surface area not lower than 130 m2/g. An amount of (a) the isobutylene-isoprene rubber contained in 100 parts by mass of a rubber component composed of (a) the isobutylene-isoprene rubber and (b) the diene-based rubber can be larger than 30 parts by mass and smaller than 55 parts by mass.
Claims19
A medical rubber composition comprising:
- (a) an isobutylene-isoprene rubber;
- (b) a diene-based rubber;
- and
- a silica having a BET specific surface area not lower than 130 m2/g, wherein
- an amount of (a) the isobutylene-isoprene rubber contained in 100 parts by mass of a rubber component composed of (a) the isobutylene-isoprene rubber and (b) the diene-based rubber is larger than 30 parts by mass and smaller than 55 parts by mass,
- an amount of the silica contained per 100 parts by mass of the rubber component is 3 parts by mass to 9 parts by mass, and
- an O2 permeability coefficient of a test slab of the medical rubber composition is at least 2.0×10−9 cc·cm/cm2·sec·cmHg and a concentration of potassium permanganate reducing substance in an oozing-substance test of a test sample of the medical rubber composition is lower than 0.5 mL/100 mL,
- wherein the test slab is prepared by press-molding the medical rubber composition at 180° C. for 6 minutes and has a thicknesses of 0.5 mm to 1.0 mm, and the test sample is prepared by press-molding the medical rubber composition at 180° C. for 6 minutes and having a diameter of 17 mm and a thickness of 2 mm.
5 more elements
Dependencies are inferred from the claim text.