| 摘要 |
Acrylic coating resins with attached light stabilizer functional groups are provided, which resins are prepared by reacting light stabilizer hydrazides, LS-C(=O)-NR<3>-NH2, with an acrylic prepolymer containing at least two different types of reactive functional groups, one of which is a hydroxyalkyl ester group and the other is carboxyl, anhydride, epoxy or isocyanate. LS is a light stabilizer moiety, e.g., of formula <CHEM> wherein R<3> is, e.g., hydrogen and R<1><5> is, e.g., a direct bond. The reaction may be carried out in an inert solvent or in the bulk state. The acrylic resins so produced are particularly useful in the stabilization of enamel or lacquer coatings and exhibit outstanding weatherability and durability. As a result of being chemically bound, the light stabilizers are resistant to loss due to volatility and extractability during typical coatings bake operations and exposure to the elements of weather. |
