ELASTOMER COMPOSITION AND MEDICAL CONTAINER STOPPER FORMED BY MOLDING SAME

1 . A elastomer composition comprising a thermoplastic elastomer composition comprising 20 to 80% by weight of component (A), 1 to 25% by weight of component (B), and 1 to 70% by weight of component (C) with respect to a total amount of the following component (A), component (B), and component (C):

Component (A): at least one block copolymer selected from: a block copolymer having a polymer block derived from a vinyl aromatic compound and a polymer block derived from at least one selected from a conjugated diene and isobutylene; and a block copolymer obtained by hydrogenating the block copolymer;

Component (B): a polypropylene resin containing component (B1) below

Component (B1): a modified polypropylene obtained by graft-modifying a polypropylene resin with a diene compound; and

Component (C): a softener for hydrocarbon rubbers.

2 . The elastomer composition according to claim 1 , wherein the diene compound of the component (B1) is a conjugated diene compound.

3 . The elastomer composition according to claim 2 , wherein the conjugated diene compound of the component (B1) is isoprene.

4 . The elastomer composition according to claim 1 , wherein the component (B1) has a melt flow rate (ISO 1133 (230° C., load 2.16 kg)) of 0.1 to 200 g/10 min.

5 . The elastomer composition according to claim 1 , wherein a weight average molecular weight (Mw) of the component (A) is 100,000 to 500,000.

6 . The elastomer composition according to claim 1 , wherein the elastomer composition has durometer hardness A (ISO 7619-1) of 10 to 40.

7 . The elastomer composition according to claim 1 , wherein the elastomer composition is an elastomer composition for a medical container stopper.

8 . A medical container stopper formed from the elastomer composition according to claim 1 .

9 . The medical container stopper according to claim 8 , wherein the medical container stopper is a medical rubber stopper.