| 摘要 |
<p>An aq. thermosetting enamel compsn. contains (A) 10-60 wt.% of a film-former composed of (1) 60-90 wt.% of an acrylic polymer, with COOH:OH ratio of 1:0.3-1.5, acid number of 35-80, and Mw of 10,000-50,000, contg. 50-60 wt.% of methyl methacrylate (I), 30-40% of butyl acrylate (II), 5-10% of hydroxyethyl acrylate (III) and 4-12% of (meth)acrylic acid (IV) and (2) 40-10% of a hexakis(methoxymethyl)melamine (V), (B) 90-40% of a solvent for the film-former, (C) amine to give a pH of 7.1-7.5, and (D) 1-20 wt.%, w.r.t. A, of an ultraviolet light stabiliser. Of the acrylic polymer, 30-50% is dispersed, with particle size 0.01-0.1 microns, and 70-50% is in soln. The acrylic polymer has a uniformity factor of 80-95%. Compsn. is esp. used as a clear coat/colour coat finish, more partic. as the colour coat, e.g. as a finish for automobiles. The coating resists weathering.</p> |
