Amino resin cross-linkers

Amino resins are the most important curing agent for hydroxyl functional polyester resins to give baking finishes with adequate curing rate and very good mechanical and chemical resistance pro­perties. Mainly butylated melamine and urea formaldehyde resins are used, up to 40 % by weight of the total binder, depending upon the characteristics of the polyester and final properties required. Acid catalysts are generally used to reduce baking temperature. The residual carboxylic acid group can also take part in the curing reaction.

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