| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject auxiliary comprising a specific calcium hydrogenphosphate, excellent in stabilizing effect when added to a resin, having high safety, useful for polypropylene, etc. SOLUTION: This stabilizing auxiliary for resin comprises calcium hydrogenphosphate shown by CaHPO4 and has 10-60m<2> /g specific surface area, >=4L/g static specific bulk volume and 0.1-10μm primary particle diameter. Preferably the calcium hydrogenphosphate is coated with one or more selected from a higher fatty acid, a higher fatty acid salt, a higher fatty acid phosphoric ester and a coupling agent. The calcium hydrogenphosphate, for example, is preferably obtained by reacting phosphoric acid with an alkali calcium compound (e.g. quick lime, etc.) in a water medium in the presence of a polyfunctional organic acid having coordinating property such as citric acid, etc., to give a columnar calcium hydrogenphosphate and treating the calcium hydrogenphosphate hydrothermally at >=60 deg.C.
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