9902.11.41 - 1,3 Benzenedicarboxylic acid, polymer with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, hexanedioic acid, 1,6-hexanediol, 1,3-isobenzofurandione and 1,1'-methylenebis[4-isocyanatobenzene], di-ethyl malonate-blocked (CAS No. 200414-59-1) (provided for in subheading 3909.50.50)

This HTS category, 9902.11.41, specifically covers a chemically complex polymer identified by CAS No. 200414-59-1. This material is a polymer formed from a specific combination of monomers: 1,3 Benzenedicarboxylic acid, 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, hexanedioic acid, 1,6-hexanediol, 1,3-isobenzofurandione, and 1,1'-methylenebis[4-isocyanatobenzene]. A key characteristic of this polymer is that it is "di-ethyl malonate-blocked," a process that modifies its reactivity or properties.

This provision is located within Chapter 99, which pertains to temporary legislation and special classification provisions. Unlike the broader, primary HTS chapters (such as Chapters 01 through 98) that classify goods based on their inherent nature and function, Chapter 99 codes are typically used to implement specific trade policies, quotas, or temporary modifications. Therefore, this category for the blocked polymer distinguishes itself from other Chapter 99 provisions by its precise chemical identification and the specific blocking agent used.

As a leaf node within the HTS database, HTS code 9902.11.41 has no further subcategories. Its function is to provide a dedicated classification for this particular blocked polymer, likely due to specific trade or policy considerations that necessitate its distinct treatment. The classification is further referenced as being "provided for in subheading 3909.50.50," indicating that without this specific Chapter 99 provision, the material would otherwise fall under a broader classification for polymers of isocyanates and formaldehydes. This cross-reference highlights the temporary or special nature of the 9902 code.