| 摘要 |
Lead-free thermoplastic polyvinyl chloride conductor coverings are disclosed which are free of lead and molecular sieve. The coverings comprise: 100 parts by weight polyvinyl chloride, from 5 to 100 parts by weight of plasticizer, from 3 to 50 weight parts of calcined clay and a stabilizer system consisting essentially of at least two different organometal salts, and from 0.5 to 10 weight parts of finely divided hydrotalcite having the formulae: ¢(M12+)y1 (M22+)y2! 1-x M x3+(OH)2 Ax/nn- mH2O (I) or Mg 1-x Alx (OH)2 Ax/n n- mH2O (II) or Mg 1-x Alx (OH)2+x mH2O (III) wherein M1 2+ represents at least one divalent metal cation, M2 2+ represents at least one divalent metal cation, M3+ represents a trivalent metal cation, Anrepresents at least one anion having a valency of n and x, y1, y2 and m are represented by the following expressions 0 < x ? 0.5, 0 < y1, 0 < y2, 0.5 ? (y1+y2) < 1, and 0 ? m < 2; or a product resulting from surface treatment of I, II, or III with an anionic surface active agent.
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