Oxygen absorber for blending in a resin and method of producing the same
View Patent ↗An oxygen absorber for blending in a resin, comprising a mixed powder containing an iron powder, a metal halide and an alkaline substance, and having a half-peak width on a plane (110) of 0.20°/2θ (Co—Kα) or less as measured by a powder X-ray diffraction method, a specific surface area of 0.5 m 2 /g or more, and an average particle size of 1 to 40 μm. The oxygen absorber effectively suppresses the generation of hydrogen, features excellent safety, exhibits excellent oxygen-absorbing capability and offers an advantage of high productivity due to the suppressed occurrence of coarse particles in the step of producing the oxygen absorber.
1. An oxygen absorber for blending in a resin, comprising a mixed powder obtained by mixing and pulverizing an iron powder, a metal halide and an alkaline substance, followed by heat treatment in the presence of oxygen, said mixed powder having a half-peak width on a plane (110) of iron of 0.20°/2θ (Co—Kα) or less as measured by a powder X-ray diffraction method, a specific surface area of 0.5 m 2 /g or more, and an average particle size of 1 to 40 μm, the surfaces of said iron powder being coated with an iron oxide, and the content of metal iron in the iron powder being 60 to 80% by weight.
2. The oxygen absorber for blending in a resin according to claim 1 , wherein said alkaline substance is a calcium hydroxide or a calcium oxide.
3. The oxygen absorber for blending in a resin according to claim 1 , wherein said alkaline substance is blended in an amount of 0.5 to 2 parts by weight per 100 parts by weight of the iron powder.
4. An oxygen-absorbing resin composition containing the oxygen absorber for blending in a resin of claim 1 .
5. An oxygen-absorbing container containing the above oxygen-absorbing resin composition of claim 4 .