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CURAMINE polyamides are condensation products of multi-functional carboxylic acids with amines. As with amido-amines an almost equivalent ratio of material results in low residual “free amine” levels and as such, this class of curing agent also has low volatility and irritation potential.
Polyamides have much higher molecular weight than the amido-amine range and as such are generally higher in viscosity. They have even greater tolerance to mix ratio violation and may be selectively used at variable ratios to influence the toughness. Deviation above and below stoichiometric concentrations enables the performance to vary from hard and rigid films through to soft and flexible coatings with increasing curing agent level. Again selected process techniques can enable specific imidazoline levels to be obtained and the resultant variation in cure.
An alternate approach is the adduction of the polyamide with epoxy in order to improve subsequent compatibility with the epoxy component of the system. This technique is employed in some of our products and the resultant grades have improved surface appearance, especially when cured at lower temperatures. They may still be blended with other types of curing agents to tailor performance.
Many of the polyamides and adducted polyamides are high in viscosity and are offered “pre-cut” in solvents. In addition to standard xylene solutions we offer unique customer dilutions to satisfy specific requirements and will be pleased to discuss these options. Additionally, we offer medium viscosity “non-solvated” polyamide adducts developed for solvent free coatings. We recommend discussion with our technical sales staff in order to establish the optimum product types for your application.
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