N,N'-Diphenyl-p-phenylenediamine
N,N'-Diphenyl-p-phenylenediamine (DPPD) is a substituted aromatic polyamine used as an antioxidant in rubber. Classified in HTS 2921.59.80 as a derivative where phenyl substitutions maintain polyamine character under Chapter 29 amine-function rules.
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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 pure p-phenylenediamine without N-substituents
Unsubstituted parent has specific earlier subheading.
If imported as rubber antioxidant compound
End-use in rubber compounding shifts to Chapter 38 per functional use.
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Import Tips & Compliance
• Molecular weight and substitution pattern confirmation via MS/NMR
• Rubber accelerator end-use docs; avoid Chapter 38.12 classification
• Melting point specs (144-148°C) verify identity
Related Products under HTS 2921.59.80
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.
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.