| 摘要 |
Solid compsns. (I) contain (a) a solid, oligomeric, cationically polymerisable polyglycidyl ether or ester (II), or a mixt. of (II) with a liq. or crystalline monomeric mono-, di- or poly-epoxy resin, or a mixt. of (II) with a cyclic acetal, where (II) are the above mixt. have a Tg of above 35 degrees C, (b) a multifunctional nucleophilic chain transfer agent, (c) 0.05-3 wt.% photoinitiator for cationic polymerisation (w.r.t. amt. of a), and opt. (d) normal additives for coating powders. These compsns. either contain no cpds. with prim., sec. or tert. N atoms, or they contain not more than 50 mole% of such cpds., w.r.t. the amt. of component (c). Also claimed are crosslinked coatings obtd. by spraying (I) electrostatically onto a substrate, heating to melt the coating, and crosslinking by irradiation with UV and opt. by heating (pref. with IR radiation).
|
