Next Generation Can Coatings - Interior

Why are Interior Can Coatings Important?

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Metal can interiors are prepared and coated to prevent corrosion & to maintain freshness for a variety of foodstuffs and beverages.  These coatings have traditionally been derived from epoxy resins, but they offer little to no chemical resistance in the final performance.  Eastman’s cycloaliphatic intermediates (CHDA and CHDM) exhibit an exceptional balance of both delivered hardness and flexibility for premium protection.  

When it comes down to brass tax, the numbers don't lie. The table below details several key metrics in coating performance between AD, Eastman's 1,4-CHDA and PIA in a polyester-melamine enamel (Resin:NPG/TMP/Diacid/PIA [1.97/0.30/1.00/1.00]). Learn more about Eastman's CHDA ►
 

^aPencil hardness scale from least to most hard: HB, F, H, 2H, 3H, etc.
^bEffects scale: N = none, VS = very slightly, S = slight, and M = moderate
 

Hydrolytic Stability

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Coating performance can vary greatly under basic or acidic conditions, especially in regard to overall hydrolytic stability. Eastman's CHDA diester out performs a range of common cycloaliphatic intermediates like adipic acid and PIA. The chart below measures hydrolysis of an NPG glycol diester at an elevated temperature of 120°C.