| http://www.w3.org/ns/prov#value | - Known powdery calcium hydroxide or magnesium hydroxide can be used in the present invention, but in view of the hydrogen chloride-capturing property and the dispersibility in a chlorine-containing polymer, calcium hydroxide or magnesium hydroxide in the fine particulate form having a median diameter smaller than 20 ??m, especially smaller than 10 ??m, based on the volume is preferably used.
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