9902.10.78 - Poly(vinyl chloride-co-hydroxypropyl acrylate) (CAS No. 53710-52-4) (provided for in subheading 3904.40.00)

This HTS category, 9902.10.78, specifically covers Poly(vinyl chloride-co-hydroxypropyl acrylate) identified by CAS number 53710-52-4. While the primary classification for this polymer would typically fall under Chapter 39 (Plastics and articles thereof), this specific provision within Chapter 99 indicates a temporary modification or restriction, often related to agricultural or trade agreement legislation as referenced in Section XXII. The material is a copolymer, meaning it is formed by the polymerization of two or more different monomers, in this case, vinyl chloride and hydroxypropyl acrylate.

Distinguishing this item from its sibling categories within Chapter 99, which are generally used for temporary legislation and import restrictions, is crucial. Unlike broader categories that might encompass various temporary measures, 9902.10.78 is highly specific, targeting a particular chemical compound. The "provided for in subheading 3904.40.00" notation is significant, as it clarifies that while the substance itself is a polymer, its import is subject to these special provisions. This suggests that other copolymers or related plastics that do not meet the specific criteria of CAS No. 53710-52-4 would be classified elsewhere within Chapter 99 or Chapter 39, depending on the nature of any applicable restrictions.

As this is a leaf node, there are no further subcategories within this specific HTS code. Classification under 9902.10.78 is the definitive designation for this particular copolymer when imported under the conditions governed by Section XXII. Importers must ensure they are handling the exact polymer specified by the CAS number to correctly apply this classification and adhere to any associated duties, quotas, or other import requirements.