UCD® SF solvent-free colorants provide a broad color spectrum in a colorless, unsaturated, low-molecular-weight polyester resin containing no solvents or reactive monomers.
These products are formulated at maximum pigment loading to minimize the effects of the polyester vehicle on the coating film while maintaining a pourable colorant system.
These colorants were designed for cross-linkable coatings. The unsaturation allows for cross-linking through double bonds in peroxide-cured polyesters or MMA coatings. The acid end groups provide a reactive group to crosslink the polyester resin in amine-cured epoxy systems. Additionally, the secondary hydroxyl groups provide a means to crosslink the resin with polyisocyanates. When crosslinked or covalently reacted, as in gel coats, the UCD® SF vehicle is fully converted as part of the final coating film.
Although the UCD® SF colorants are primarily used in curing formulations, the vehicle is also compatible with a variety of non-crosslinking resins, including vinyls, alkyds, nitrocellulose, acetates and acrylic lacquers.
The plasticizing effect of the SF resin occurs at levels above 15% of total vehicle solids. Therefore, when considering total pigmentation with SF colorants, carefully evaluating the potential impact of SF resin properties on film integrity is key.
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