Abstract: 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 ⅕ 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.

Abstract: A painted polyacetal article comprises a polyacetal substrate comprising 90-99.5 wt % polyacetal and 0.5-10 wt % of semicrystalline or amorphous thermoplastic non-polyacetal resin of molecular weight 1,000-50,000; and a paint applied to the polyacetal substrate from a solvent-borne, water-borne or powder 1K paint system onto a surface of the polyacetal substrate pretreated to enhance exposure of said semicrystalline or amorphous thermoplastic non-polyacetal resin of the substrate to the applied paint. The paint is a thermoplastic or partly thermoplastic non-thermosetting paint. A layer of thermosetting paint or varnish can be applied over the thermoplastic paint. The painted polyacetal article has improved paint adhesion and good retained physico-mechanical properties.

Abstract: Polyacetal articles are etched to prepare the surface for subsequent treatments, in particular plating and painting, by immersing the articles in a mixed acid bath containing the following four acids and water in the following quantities and proportions:

Abstract: The present invention relates to layered articles comprising (a) a substrate comprising 99.5-40 weight percent of an polyoxymethylene polymer; and 0.5-60 weight percent of at least one non-acetal thermoplastic polymer; and (b) at least one additional layer deposited thereon.