11th December 2018

DYMAX DEVELOPS NEW CELLULOSE ESTERS

New UV-curable cellulose ester additives and binders from Dymax researchers provide are claimed to offer improved surface hardness and solvent resistance in hard coating and ink applications.UV-curable cellulose ester additives do not disturb clarity; therefore, they are recommended for clear, very low haze coatings and glossy inks.

The introduction of an acrylic functional pendant substituent to a cellulose ester provides greater hardness and more scratch and solvent resistance when compared with unmodified cellulose ester in UV-cured coatings. By varying the functionality, type and amount of substituent, a wide range of properties can be obtained.

Commercially available acrylamidomethyl functional cellulose esters (AACEs) are typically used in formulations at two to 10 percent by weight. They are used in coatings and inks as reactive thickeners and adhesion promoters. When compared to coatings formulated with silica additives, coatings formulated with cellulose ester additives have less haze.

As plastics replace glass in many applications, the need for scratch- and chemical-resistant coatings increase. The new modified cellulose esters are designed to improve scratch resistance and create impact-resistant coatings.

Urethane acrylate modified cellulose esters provide improved surface hardness compared to acrylamidomethyl functional cellulose ester. They are capable of improving the pencil hardness of soft coatings without reducing impact resistance. In hard coating formulations they can be used to improve flexibility and impact resistance without changing pencil hardness. UV-curable cellulose esters do not disturb clarity and, therefore, they can be used as additives for inks and optically clear coatings.

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