Abstract
Alkyd resins of several types are used in coatings. Oxidizing alcohols prepared using semidrying or drying oils are used in architectural gloss paints. Waterborne alkyds are best used by emulsifying oxidizing alkyds. Styrenated alkyds are used particularly in fast drying primers. Nonoxidizing alkyds are used as nonvolatile plasticizers and in baking finishes with melamine-formaldehyde or polyisocyanate crosslinkers. Uralkyds are made by using an isocyanate to replace the phthalic acid used in alkyds. They are more expensive but have superior abrasion and hydrolytic resistance. Stable waterborne oxidizing urethanes have superior stability and abrasion resistance as compared to alkyds. Similarly, epoxy resins are prepared by esterifying with drying oil fatty acids. They exhibit excellent adhesion and saponification resistance and are used in primers. Waterborne epoxy esters are made by reacting with maleic anhydride and are stale to hydrolysis.
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