| 摘要 |
<p>The lacquers contain moisture-hardenable urethane pre-polymers or mono-components of type II of the ASTM classification, and natural or synthetic mother-of-pear pigment and/or pigments which give a white coating, and/or other pigments and/or organic soluble dyes. The compositions may contain silicones, cellulose resins or vinyl chloride- vinyl acetate copolymers. The pigments may be omitted, giving a colourless lacquer. The lacquers are prepared in a dry, inert atmosphere, and are sold in hermetically sealed containers under dry nitrogen. The lacquers are used to beautify and protect natural or artificial teeth, or as nail varnishes.</p> |
