| 摘要 |
In a method for inhibiting the corrosion-causing tendency and coloration of an olefin polymer or copolymer containing a halogen component by incorporating about 0.01 to about 5 parts by weight of a hydrotalcite; the improvement which comprises mixing an olefin polymer or copolymer containing a halogen component attributed to a polymerization catalyst and/or to post-halogenation, with a hydrotalcite of the formula Mg1-xAlx(OH)2An-x/n.mH2O wherein 0<x</=0.5, m is a positive number, and An- represents an anion having a valence of n, or a product resulting from the surface-coating of said hydrotalcite with an anionic surface-active agent, said hydrotalcite having (i) a BET specific surface area of not more than 30 m2/g, preferably not more than 20 m2/g, (ii) an average secondary particle size of not more than 5 microns, preferably not more than 1.5 microns, and preferably (iii) a crystallite size, in the <003> direction determined by an X-ray diffraction method, of at least 600 A, preferably at least 1000 A.
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