4,4'-Methylenebis(2-chloroaniline) (MOCA)
4,4'-Methylenebis(2-chloroaniline), commonly known as MOCA, is an aromatic polyamine derivative used primarily as a curing agent in polyurethane elastomers. It falls under HTS 2921.59.80 as it is a derivative of aromatic polyamines (specifically a dianiline derivative) that does not fit into more specific subheadings within 2921.59. This classification aligns with chapter notes prioritizing the last numerical heading for amine-function compounds.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as o,o'-, m,m'-, o,m'-, or similar simple diaminotoluenes
Simpler aromatic diamine structures without additional substituents like methylene bridges fall earlier in numerical order per Chapter 29 note 3.
If imported as a quaternary ammonium salt derivative
Certain amine derivatives converted to quaternary salts are classified under heterocyclic compounds if they form ring structures, per Chapter 29 exclusions.
If imported as a formulated mixture with solvents or stabilizers exceeding Chapter 29 put-up limits
Mixtures not qualifying under Chapter 29 note (e) for transport-only solvents shift to chemical preparations in Chapter 38.
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Import Tips & Compliance
• Verify chemical purity and provide Certificate of Analysis (CoA) to confirm it meets 'other' aromatic polyamine derivative criteria under Chapter 29 notes
• Include Safety Data Sheet (SDS) detailing toxicity (known carcinogen) for CBP review and compliance with TSCA import requirements
• Avoid misclassification as a simple diamine; ensure documentation specifies polyamine structure to prevent reclassification to 2921.51
Related Products under HTS 2921.59.80
4,4'-Diaminodiphenylmethane (DADPM)
4,4'-Diaminodiphenylmethane (DADPM), also known as MDA, is a key aromatic polyamine used in epoxy resin curing and polyurethane production. Classified under HTS 2921.59.80 as an 'other' derivative of aromatic polyamines, it features two aniline rings linked by a methylene group, fitting Chapter 29's amine-function compounds not covered by prior subheadings.
4,4'-Diamino-3,3'-dichlorodiphenylmethane
This chlorinated aromatic polyamine derivative serves as a curing agent in specialty polymers. HTS 2921.59.80 covers it as an 'other' derivative, as halogenated polyamine structures are included under amine-function headings per Chapter 29 note on halogenated derivatives.
Benzidine Sulfate
Benzidine sulfate is the salt form of the aromatic polyamine benzidine, used in analytical chemistry and dye production. As a salt of an aromatic polyamine, it falls under HTS 2921.59.80 per Chapter 29 note 3(C)(1), classifying inorganic salts with organic amine compounds in the organic compound's heading.
p,p'-Diaminostilbene
p,p'-Diaminostilbene is an aromatic polyamine featuring a stilbene backbone, used in optical brighteners. As a derivative not covered by prior 2921.59 subheadings, it is classified in HTS 2921.59.80 under the last applicable amine-function heading.
4,4'-Diaminobenzanilide
4,4'-Diaminobenzanilide is an aromatic polyamine amide derivative used in polymer synthesis. HTS 2921.59.80 captures it as an 'other' polyamine derivative, where the amine functions predominate over amide per Chapter 29 classification hierarchy.
m-Phenylenediamine Technical Grade
Technical grade m-phenylenediamine is a diaminobenzene polyamine used in epoxy hardeners, though 'pure' grades may have specific codes. As an aromatic polyamine not fitting earlier subheadings, HTS 2921.59.80 applies to impure or derivative forms per Chapter 29 impurity allowances.