Tiangang® TAD

Tiangang® TAD

Hindered amine intermediate · TAD

multi-functional reactive additive for PA polymerization to improve dyability, spinning conditions, and prevention of yellowing

In one sentence: A core intermediate for hindered amine synthesis, also used in pharmaceuticals, agrochemicals, polymerisation inhibitors and epoxy curing.

  • Molecular weight: 156 g/mol (source: spec table on this page)
  • Density (20 °C): 0.8965 g/cm³ (source: spec table on this page)
  • Boiling point: 201 °C (source: spec table on this page)
  • Flash point: 80 °C (source: spec table on this page)
  • Viscosity (20 °C): 7 cP (source: spec table on this page)

What it is

Tiangang® TAD is a hindered amine intermediate. These are the raw materials or monomers used to build hindered amine light stabilizers. They are not end-use additives: the buyer still polymerises, esterifies or aminates them into finished grades such as 944, 622 or 2020. Product identifiers: chemical name 4-Amino-2,2,6,6-Tetramethylpiperidine; CAS 36768-62-4; molecular weight 156.

Technical data

Chemical name4-Amino-2,2,6,6-Tetramethylpiperidine
CAS number36768-62-4
Molecular weightDensity,
g/cm3, @20oC		Boiling point
oC		Flash point
oC		Viscosity
cP, @20oC		Water solubility
Tiangang® TAD1560.8965201807Soluble
Tiangang® TAD200L plastics drums (160KG of product)
Tiangang® TADThe use of proper protective equipment is recommended. Excess exposure to the product should be avoided. Wash thoroughly after handling. Store the product in a cool, dry, well-ventilated area away from incompatible materials.
Disclaimer
The information supplied is presented in good faith and has been derived from sources believed to be reliable. Since conditions of use are beyond our control, all risks are assumed by the user. No representation is expressed or implied, and nothing herein shall be construed as permission or recommendation to practice a patented invention without license.

Molecular weight around 156 — low-MW territory: fast diffusion and early onset, at the cost of volatility and migration, which suits thin parts.

Where it is used, and at what loading

Downstream use concentrates on HALS synthesis; some grades also serve pharmaceuticals, agrochemicals, polymerisation inhibitors and epoxy curing. Specifications are usually tighter than for end additives, because purity, water and colour all carry into the next reaction step.

As a synthesis raw material it is charged by reaction stoichiometry, not by part loading.

Choosing between similar grades

Three things decide the choice for TAD: molecular weight and volatility, basicity, and compatibility with the other components in the system. TAD (4-amino-2,2,6,6-tetramethylpiperidine, MW 156) is used to build monomeric HALS such as 770; downstream is sensitive to colour and monofunctional impurities.

Frequently asked questions

How much does intermediate purity affect downstream?

Directly. Impurities carry into the polymerisation and shift molecular-weight distribution and colour, which finally shows up as light-stabilising efficiency in the finished HALS. We control purity, water content and colour on these grades.

Why does one intermediate come in several specifications?

Because downstream processes differ. Polymerisation cares about monofunctional impurities, esterification about hydroxyl value, polymerisation inhibition about radical scavenging. The specification differences are downstream differences.

Can an intermediate be used directly as a light stabilizer?

A few can, where a low-MW piperidinol gives useful stabilisation in a specific system. Most cannot: the molecular weight is too low, so volatilisation and migration are too fast for long-service outdoor parts.

The figures and guidance above follow Tiangang's published technical material and common industry practice. For a specific formulation, refer to the batch COA and the technical agreement between the parties.

Technical reviewTiangang Technical CenterVersion2026-11-07
Specifications and application notes on this page are compiled from Tiangang's published technical data. Actual values are governed by the COA shipped with each lot and the technical agreement confirmed by both parties.

Certifications

  • National High-Tech Enterprise
  • Vice Chairman Unit, China Plastics Processing Industry Association (CPPIA)
  • Vice Chairman Unit, Agricultural Plastics Branch, China Agricultural Plastics Application Technology Society
  • Member, Ageing Methods Subcommittee, National Technical Committee on Plastics (SAC/TC15/CS5)
  • Member, Society of the Plastics Industry (SPI), USA

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