| abstract |
PROBLEM TO BE SOLVED: To provide an excellent hydrolysis resistance effect, a good hue when kneaded with a resin, and no defects such as discoloration of processing and toxicity, and workability after mixing with resin. Provided is an organic phosphorus-based antioxidant capable of improving antioxidant properties. A specific ratio of (a) an organic phosphite and / or an organic phosphonite and (b) a metal salt antacid treated with a specific ratio of a surface treatment agent, wherein the surface treatment agent is a silane coupling agent. Organic phosphorus antioxidants selected from the group of specific compounds such as |