Oxygen-absorbing multilayer body, oxygen-absorbing container, oxygen-absorbing airtight container, oxygen-absorbing push-through pack, and storage method using same
Provided is an oxygen-absorbing multilayer body including an oxygen-absorbing layer containing an oxygen-absorbing composition and a thermoplastic resin layer containing a thermoplastic resin (b), wherein the oxygen-absorbing composition includes at least one compound having a tetralin ring represented by Formula (1), a transition metal catalyst, and a thermoplastic resin (a).
1. An oxygen-absorbing multilayer body comprising:
an oxygen-absorbing layer containing an oxygen-absorbing composition; and
a thermoplastic resin layer containing a thermoplastic resin (b), wherein
the oxygen-absorbing composition comprises at least one compound having a tetralin ring represented by Formula (1), a transition metal catalyst, and a thermoplastic resin (a):
where R 1 to R 12 each independently represent a hydrogen atom or a monovalent substituent, the monovalent substituent being at least one selected from the group consisting of a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, a phenyl group, a naphthyl group, a monovalent substituent having one hydrogen atom removed from a five- or six-membered aromatic or non-aromatic heterocyclic compound having 1 to 12 carbon atoms, a cyano group, a hydroxy group, a carboxyl group, an ester group, an amide group, a nitro group, an alkoxy group, an aryloxy group, an acyl group, an amino group, a thiol group, an alkylthio group, an arylthio group, a heterocyclic thio group, an imide group, a substituent represented by Formula (1a), and a substituent represented by Formula (1b), which each optionally further have a substituent; two of the substituents represented by R 1 to R 12 are optionally bonded to each other to form an aromatic, aliphatic, or hetero ring having 4 to 7 carbon atoms, provided that the hetero ring is an acid anhydride ring being glutaric anhydride ring or adipic anhydride ring; and at least one hydrogen atom is bonded to a benzylic position of the tetralin ring;
where each R independently represents a monovalent substituent, the monovalent substituent being at least one selected from the group consisting of a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, a cyano group, a hydroxy group, a carboxyl group, an ester group, an amide group, a nitro group, an alkoxy group, an aryloxy group, an acyl group, an amino group, a thiol group, an alkylthio group, an arylthio group, a heterocyclic thio group, and an imide group, which each optionally further have a substituent; two of the substituents each represented by R are optionally bonded to each other to form a ring; W represents a bond or a bivalent organic group, the bivalent organic group being at least one selected from the group consisting of an aromatic hydrocarbon group, a saturated or unsaturated alicyclic hydrocarbon group, a linear or branched saturated or unsaturated aliphatic hydrocarbon group and a heterocyclic group, —C(═O)—, —OC(═O)—, —N(H)C(═O)—, and an arbitrary combination thereof; m represents an integer of 0 to 4; n represents an integer of 0 to 7; p represents an integer of 0 to 8; and q represents an integer of 0 to 3.
2. The oxygen-absorbing multilayer body according to claim 1 , wherein the compound having a tetralin ring represented by Formula (1) has two or more carbonyl groups.
3. The oxygen-absorbing multilayer body according to claim 2 , wherein in Formula (1), at least two of R 1 to R 12 are monovalent substituents represented by Formula (2):
—C(═O)—X (2)
where X represents one selected from the group consisting of a hydrogen atom, a hydroxy group, an alkyl group, an alkoxy group, a monoalkylamino group, and a dialkylamino group; and a plurality of X may be the same or different.
4. The oxygen-absorbing multilayer body according to claim 1 , wherein the compound having a tetralin ring represented by Formula (1) has two or more tetralin rings.
5. The oxygen-absorbing multilayer body according to claim 1 , wherein a proportion of the amount of the compound having a tetralin ring represented by Formula (1) to the total amount of the compound having a tetralin ring represented by Formula (1) and the thermoplastic resin (a) in the oxygen-absorbing composition is 1% to 30% by mass.
6. The oxygen-absorbing multilayer body according to claim 1 , wherein the thermoplastic resin (a) is at least one selected from the group consisting of a polyolefin, a polyester, a polyamide, an ethylene-vinyl alcohol copolymer, and a chlorine-containing resin.
7. The oxygen-absorbing multilayer body according to claim 1 , wherein the transition metal catalyst contains at least one transition metal selected from the group consisting of manganese, iron, cobalt, nickel, and copper.
8. The oxygen-absorbing multilayer body according to claim 1 , wherein the transition metal catalyst is contained in an amount of 0.001 to 10 parts by mass in terms of the transition metal amount, in the oxygen-absorbing composition, based on 100 parts by mass of the total amount of the compound having a tetralin ring represented by Formula (1) and the thermoplastic resin (a).
9. The oxygen-absorbing multilayer body according to claim 1 , wherein
the thermoplastic resin layer is a sealant layer; and
the oxygen-absorbing multilayer body is composed of at least three layers including the sealant layer, the oxygen-absorbing layer, and a gas barrier layer containing a gas barrier material in this order.
10. An oxygen-absorbing paper container prepared by molding an oxygen-absorbing multilayer body being composed of at least four layers including the oxygen-absorbing multilayer body according to claim 9 and a paper base layer laminated to the gas barrier layer side of the oxygen-absorbing multilayer body.
11. An oxygen-absorbing container comprising the oxygen-absorbing multilayer body according to claim 1 .
12. The oxygen-absorbing container according to claim 11 , being one selected from the group consisting of a pouch, a cup, a tray, and a bottle.
13. The oxygen-absorbing multilayer body according to claim 1 , being an oxygen-absorbing multilayer injection-molded article.
14. An oxygen-absorbing sealed container comprising:
an oxygen-absorbing multilayer container body prepared by molding the oxygen-absorbing multilayer body according to claim 1 ; and
a gas barrier lid member being composed of at least two layers including an inner layer containing a thermoplastic resin (c) and a gas barrier layer containing a gas barrier material in this order, wherein
the thermoplastic resin layer in the oxygen-absorbing container body and the inner layer in the gas barrier lid member are joined to each other.
15. An oxygen-absorbing PTP packaging body comprising:
an oxygen-absorbing bottom member prepared by molding the oxygen-absorbing multilayer body according to claim 1 ; and
a gas barrier lid member being composed of at least two layers including an inner layer containing a thermoplastic resin (d) and a gas barrier layer containing a gas barrier material in this order, wherein
the thermoplastic resin layer in the oxygen-absorbing bottom member and the inner layer in the gas barrier lid member are joined to each other.
16. A storage method comprising storing at least one selected from the group consisting of cooked rice, an alcoholic beverage, fruit juice and/or vegetable juice, and a drug solution in an oxygen-absorbing container including the oxygen-absorbing multilayer body according to claim 1 .