Thermoplastic resin pellets and method for preparing same

摘要

The present invention relates to resin pellets which comprises a thermoplastic resin (A) and an oxidation catalyst (B) which is not supported by any carrier, wherein if the peak area in the vicinity of 1715 cm−1 is defined to be Ic and the peak area observed in the vicinity of 1470 cm−1 is defined to be Im in the IR spectroscopic measurement of the pellets, the ratio: Ic/Im observed for the surface of the pellet is greater than that observed for the interior thereof. The pellets are thermoplastic resin pellets excellent in the oxygen-absorbing capacity and accordingly, they can suitably used as pellets for molding an oxygen absorptive resin article.

主权项

1. Resin pellets which comprise a thermoplastic resin (A) and an oxidation catalyst (B) which is not supported by any carrier, wherein if the peak area in the vicinity of 1715 cm−1 is defined to be Ic and the peak area in the vicinity of 1470 cm−1 is defined to be Im in the IR spectroscopic measurement of the pellets, the ratio: Ic/Im observed for the surface of the pellet is greater, by not less than 0.01, than that observed for the interior thereof, wherein the surface of the pellets is strongly oxidized as compared with the inside of the pellets, the resin pellets being prepared by melt-kneading a raw material comprising a thermoplastic resin (A) and an oxidation catalyst (B) which is not supported by any carrier in a non-oxidizing atmosphere, forming the molten raw material into a resin strand and optionally cutting the resulting strand into resin pellets; and then making the resulting strand or the pellets absorb oxygen (i) in an oxidizing atmosphere of not less than 40° C. for 1 to 6 hours.