3905.91.10.00 - Containing by weight 50 percent or more of derivatives of vinyl acetate

This HTS classification covers copolymers that are primarily composed of vinyl acetate or other vinyl esters, specifically those containing 50 percent or more of derivatives of vinyl acetate by weight. These materials, when in their primary forms (e.g., powders, granules, flakes), are considered polymers within Chapter 39 of the Harmonized Tariff Schedule. Examples include vinyl acetate copolymers used as binders in adhesives, coatings, and paints, where the vinyl acetate component is dominant.

Distinguishing this category from its sibling, 3905.91.50.00 (Other), relies on the precise chemical composition. While both fall under "Other copolymers" within polymers of vinyl acetate or other vinyl esters, this specific classification is reserved for those where vinyl acetate derivatives constitute 50% or more of the total weight. The sibling category would encompass copolymers where vinyl acetate is present but not the predominant component by weight, or where other vinyl ester combinations not meeting the 50% threshold are present.

As this is a leaf node, there are no further subcategories. Therefore, the classification is determined by the explicit weight percentage of vinyl acetate derivatives. Importers should ensure their product's chemical analysis confirms the stated 50% or greater proportion of vinyl acetate derivatives to correctly apply this HTS code.