Oxygen-absorbing resin composition and oxygen-absorbing multilayer injection-molded article and oxygen-absorbing multilayer container using same
An oxygen-absorbing resin composition containing a polyester compound, and a transition metal catalyst, and wherein the polyester compound is a polyester compound having a tetralin ring obtained by synthesis using a zinc compound contained in a catalyst; the zinc compound contained in a catalyst is present together with the obtained polyester compound in the oxygen-absorbing resin composition; the transition metal catalyst is different from the zinc compound contained in a catalyst; and the oxygen-absorbing resin composition is obtained by mixing the transition metal catalyst with the polyester compound present together with the zinc compound contained in a catalyst.
1. An oxygen-absorbing resin composition comprising a polyester compound and a transition metal catalyst,
wherein the polyester compound has at least one constituent unit having a tetralin ring selected from the group consisting of constituent units represented by the following general formulas (5) to (7):
wherein the polyester compound is a polyester compound having a tetralin ring obtained by synthesis using a zinc compound contained in a catalyst;
wherein the zinc compound contained in a catalyst is present together with the obtained polyester compound in the oxygen-absorbing resin composition;
wherein the transition metal catalyst is different from the zinc compound contained in a catalyst;
wherein the oxygen-absorbing resin composition is obtained by mixing the transition metal catalyst with the polyester compound present together with the zinc compound contained in a catalyst;
wherein the transition metal catalyst is contained in an amount from 0.001 parts by mass or more to 10 parts by mass or less in terms of a transition metal based on 100 parts by mass of the polyester compound;
wherein the zinc compound is contained in the oxygen-absorbing resin composition in an amount from 0.001 parts by mass or more to 10 parts by mass or less in terms of a zinc metal based on 100 parts by mass of the polyester compound; and
wherein the content of the tetralin ring-containing polyester compound is at least 90% by mass based on a total amount of the oxygen-absorbing resin composition.
2. The oxygen-absorbing resin composition according to claim 1 ,
wherein the transition metal catalyst comprises at least one transition metal selected from the group consisting of manganese, iron, cobalt, nickel and copper.
3. An oxygen-absorbing multilayer injection-molded article comprising an oxygen-absorbing layer formed of the oxygen-absorbing resin composition according to claim 1 and a resin layer comprising a thermoplastic resin.
4. An oxygen-absorbing multilayer container obtained by molding the oxygen-absorbing multilayer injection-molded article according to claim 3 into a cup or bottle form.
5. The oxygen-absorbing multilayer container according to claim 4 ,
wherein the molding is stretch blow molding.
6. An oxygen-absorbing multilayer injection-molded article comprising an oxygen-absorbing layer formed of the oxygen-absorbing resin composition according to claim 2 and a resin layer comprising a thermoplastic resin.
7. The oxygen-absorbing resin composition according to claim 1 , wherein the transition metal catalyst comprises cobalt.
8. The oxygen-absorbing resin composition according to claim 1 , wherein the catalyst for producing a polyester compound further comprises titanium.