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AssigneeCiba Specialty Chemicals Corporation
InventorsWeilong L. Chiang, Boh C. Tsai, Stephen Y. Chen, Lakshmi N. Venkateshwaran
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Oxygen-scavenging compositions comprising an oxidizable metal component, an electrolyte component and a solid, non-electrolytic, acidifying component. When blended with soft, flexible polymeric resins, these compositions exhibit good oxygen-scavenging performance with improved oxidation efficiency relative to compositions containing an oxidizable metal component, an electrolyte, and an acidifying component combined with a more rigid thermoplastic resins. Selection of a thermally stable non-electrolytic, acidifying component is important when melt compounding the compositions into polymeric resins and particularly for extrusion coating applications. The compositions can be used directly as an oxygen absorbent resin melt-fabricated into a wide variety of oxygen-scavenging packaging articles or as concentrates in combination with other thermoplastic resins.
An oxygen-scavenging composition comprising an oxidizable metal component, an electrolyte component, a non-electrolytic acidifying component and a polymeric resin with a 1% secant modulus less than about 25,000 p.s.i. and/or a Shore D Hardness less than about 45.
An oxygen-scavenging composition comprising iron, sodium chloride, and a non-electrolytic acidifying component selected from the group consisting of:
An oxygen-scavenging composition comprising an oxidizable metal component, an electrolyte component, a non-electrolytic acidifying component in a polymeric resin with a 1% secant modulus less than about 20,000 p.s.i. and/or a Shore D Hardness less than about 42.
Dependencies are inferred from the claim text.