| 摘要 |
<p>A polyacetal mixture for processing into a polyacetal article to be acid-etched and plated comprises a polyacetal resin blend comprising 97-99.9 wt % polyacetal and 0.1-3 wt % of semicrystalline or amorphous thermoplastic non-polyacetal resin of molecular weight 5,000-50,000; and acid-soluble particles such as calcium carbonate. The acid-soluble particles are present in an amount from 2 to 6% by weight of the polyacetal blend, at least 98% of said acid-soluble particles being in the size range preferably from 0.1 to 2 micrometers. The mixture preferably also comprises acid-insoluble inorganic particles in particular fumed silica, present in an amount from 1/5 to {fraction (1/50 the weight of the acid-soluble particles, the size of the acid-insoluble particles being from {fraction (1/20 to {fraction (1/100 the size of the acid-soluble particles. The plated polyacetal articles have superior aesthetic appearance while retaining good plating adhesion and good resistance of the polyacetal to chemical attack.</p> |
