9902.11.52 - α-Alkenes, C14-C20, polymers with maleic anhydride, 2-(1-piperazinyl) ethylimides, plasticized with diisononyl phthalate (CAS No. 28553-12-0) and bis(1-methylethyl)-naphthalene (CAS No. 38640-62-9) (provided for in subheading 3911.90.90)

This HTS classification, 9902.11.52, designates specific, temporarily regulated chemical products. It covers polymers derived from alpha-alkenes (with carbon chain lengths C14 to C20) that have been reacted with maleic anhydride and further modified with 2-(1-piperazinyl) ethylimides. The material is then plasticized using diisononyl phthalate and bis(1-methylethyl)-naphthalene, both identified by their CAS numbers. This precise formulation falls under the temporary provisions of Chapter 99, indicating a temporary modification or restriction related to trade agreements or agricultural adjustment measures, and references its primary classification under subheading 3911.90.90 for its base polymer characteristics.

Distinguishing this category from its numerous sibling entries within the broader HTS structure is crucial. Unlike the sibling categories which generally cover live animals, agricultural products, or broadly defined manufactured goods, 9902.11.52 pertains to a highly specific, compounded polymer product with defined chemical constituents and temporary trade treatment. The siblings represent fundamental categories of goods, whereas this entry signifies a specialized item subject to particular regulatory oversight beyond its inherent material classification.

As this is a leaf node within the HTS database, there are no further subcategories. Classification under 9902.11.52 is final for goods meeting the exact description. Importers and exporters must ensure the product precisely matches the described polymer composition, plasticizers, and its provision under the temporary legislation, as any deviation could result in classification under a different HTS code or a different set of regulatory requirements.