Injection bag and injection preparation assembly

1. An injection bag that is formed of a multilayer film, the injection bag comprising:

an innermost layer that is formed of a polypropylene-based resin;

an outermost layer that is formed of a polypropylene-based resin;

an intermediate layer that is situated between the innermost layer and the outermost layer; and

two adhesive layers that are situated on either side of the intermediate layer,

the intermediate layer including a mixture of 60 to 90 mass % of a crystalline polyamide resin and 10 to 40 mass % of a noncrystalline polyamide resin,

the crystalline polyamide resin having a combined content of a monomer and a low-molecular-weight polymer of 0.8 mass % or less,

the noncrystalline polyamide resin including a semi-aromatic polyamide, and

the injection bag having a maximum UV absorbance measured in accordance with the Test Methods for Plastic Containers specified in the Japanese Pharmacopoeia 16th Edition of 0.08 or less.

2. The injection bag according to claim 1 , wherein the polypropylene-based resin of at least one of the outermost layer and the innermost layer contains a polyolefin-based resin other than the polypropylene-based resin.

3. The injection bag according to claim 1 or 2 , wherein the polypropylene-based resin has a flexural modulus of 300 to 700 MPa.

4. The injection bag according to claim 1 or 2 , wherein the polypropylene-based resin contains a polyolefin-based elastomer.

5. The injection bag according to claim 1 or 2 , wherein the intermediate layer has a thickness of 20 to 42 micrometers.

6. The injection bag according to claim 1 or 2 , wherein the crystalline polyamide resin is a polyamide 6-66 copolymer.

7. The injection bag according to claim 1 or 2 , wherein the noncrystalline polyamide resin is an isophthalic acid/terephthalic acid/hexamethylenediamine polycondensate.

8. The injection bag according to claim 1 or 2 , wherein part of the multilayer film on the inner side of the intermediate layer has a thickness of 70 micrometers or more.

9. An injection preparation assembly comprising the injection bag according to claim 1 or 2 , and a drug solution that is contained in the injection bag.

10. The injection preparation assembly according to claim 9 , wherein the injection bag is a multi-chamber container structure.

11. The injection preparation assembly according to claim 10 , wherein the drug solution contains bicarbonate ions.

12. The injection preparation assembly according to claim 11 , wherein the drug solution includes bicarbonate ions in an amount of 27 mEq/l or more.

13. The injection preparation assembly according to claim 9 , wherein the drug solution includes bicarbonate ions.

14. The injection preparation assembly according to claim 13 , wherein the drug solution includes bicarbonate ions in an amount of 27 mEq/l or more.

15. The injection preparation assembly according to claim 9 , wherein the polypropylene-based resin has a flexural modulus of 300 to 700 MPa.

16. The injection preparation assembly according to claim 9 , wherein the polypropylene-based resin contains a polyolefin-based elastomer.

17. The injection preparation assembly according to claim 9 , wherein the intermediate layer has a thickness of 20 to 42 micrometers.

18. The injection preparation assembly according to claim 9 , wherein the crystalline polyamide resin is a polyamide 6-66 copolymer.

19. The injection preparation assembly according to claim 9 , wherein the noncrystalline polyamide resin is an isophthalic acid/terephthalic acid/hexamethylenediamine polycondensate.

20. The injection preparation assembly according to claim 9 , wherein part of the multilayer film on the inner side of the intermediate layer has a thickness of 70 micrometers or more.