TCD DIAMINE 

TCD-diamine — a rigid, aliphatic, bicyclic/tricyclic diamine — is a specialty diamine used as an epoxy-curing agent, polyurethane intermediate (via diisocyanates), and as a building block for high-performance polymers (dental resins, coatings, adhesives). 
It combines a relatively compact, constrained tricyclic skeleton with two primary aminomethyl functionalities, giving accelerated reactivity vs. some linear aliphatic diamines while also imparting improved thermal and hydrolytic stability and reduced shrinkage in cured networks. 
Industrial production routes typically start from dicyclopentadiene (DCP) via hydroformylation → oxidative/hydrogenation steps → reductive amination (or direct reductive amination of dialdehyde intermediates). 
Patents describe batch and continuous hydroformylation/hydrogenation sequences optimized for yield and stereoisomer control. 
The material's application set includes room-temperature-curing epoxy hardeners, light-stable polyurethane systems, dental composites, and specialty polyamides.

Common name : TCD-diamine (sometimes written TCD-diamines)
Systematic names / synonyms: 3(4),8(9)-bis(aminomethyl)tricyclo[5.2.1.0(2,6)]decane; octahydro-4,7-methanoindene-1(2),5(6)-dimethanamine; 3(4),8(9)-bis(aminomethyl)tricyclo[5.2.1.0²,⁶]decane.
Primary CAS reported in supplier/patent literature: 1888470-05-0

TCD-diamine's core is tricyclo[5.2.1.0(2,6)]decane bearing aminomethyl substituents at the 3 and 8 positions (commonly written 3(4),8(9)-bis(aminomethyl)-tricyclo[...]decane). 
The rigid polycyclic backbone drastically reduces conformational freedom relative to linear diamines and gives the compound several stereoisomers (endo/exo variants and stereochemical configurations). 
The rigid cage leads to distinctive steric shielding of the amine groups combined with aliphatic (non-aromatic) hydrocarbon character.

Structural consequences:
Steric environment: the aminomethyl groups are attached to bridgehead-adjacent carbons; their accessibility and basicity are influenced by the ring geometry.
Reactivity: primary amine hydrogens remain reactive toward epoxides and carbonyls but exhibit a different kinetic profile (often faster curing at ambient temperatures than highly hindered secondary amines, and less yellowing than aromatic amines).
Physical properties: relatively high density for an aliphatic diamine (~1.04 g·cm⁻³ reported in supplier data), a moderately high flash point (~160 °C reported for some commercial grades), and low vapor pressure typical of heavy aliphatic diamines. 

Synthesis / industrial production routes
Overview / feedstock
Commercial TCD-diamine processes typically start from dicyclopentadiene (DCP) because DCP provides the bicyclic skeleton necessary to build the tricyclic TCD core. 
Hydroformylation (oxo reaction) of DCP, followed by hydrogenation and subsequent conversion of formyl or hydroxymethyl intermediates to the corresponding amines (reductive amination) is the common strategy described in patents and technical literature. 

Typical stepwise sequence (industry patents)
Hydroformylation of DCP → gives mono- and bis-formyl tricyclic aldehyde intermediates (e.g., 8(9)-formyl-tricyclo[…]dec-3-ene and the bis-formyl derivative). 
Control of regioselectivity is important and achieved via catalyst selection (group VIII transition metal catalysts with phosphorus ligands; heterogeneous and homogeneous approaches are described). 

Hydrogenation/isomerization → saturates remaining double bonds and forms stable tricyclic dialdehyde or diol intermediates. 
Patent families describe either two-stage hydroformylation/hydrogenation or tandem processes in different phases to maximize conversions. 

Reductive amination of the dialdehyde (or conversion of diol → dialdehyde → reductive amination) with ammonia or primary amine equivalents (H₂ + NH₃ / hydrogenation with catalysts or via catalytic transfer hydrogenation) yields the bis(aminomethyl) product (TCD-diamine). 
Reductive amination conditions (catalyst, pressure, temperature) are chosen to maximize conversion and limit over-reduction or side products. 

Alternative routes / derivatives
Production of the TCD-diol (dimethanol) and subsequent functionalization (e.g., conversion to diisocyanate for polyurethanes or to acrylates for UV curable oligomers) is common; these related intermediates carry separate CAS numbers. 
Process considerations
Catalyst selection: Rh/P or Co/ligand systems for hydroformylation; noble metals (Pd, Pt, Raney-Ni) or supported metal catalysts for hydrogenation/reductive amination are discussed in patent literature.

Separation: organic/aqueous phase separations, distillation and hydrogenation reactors must be adapted for the polycyclic intermediates' low volatility.

Stereoisomer control: many industrial processes produce mixture of stereoisomers; product properties (viscosity, reactivity) are characterized for the mixture rather than a single stereoisomer. 

Physicochemical properties (typical/commercial grade)

(Values below are typical ranges reported by suppliers and technical datasheets for commercial TCD-diamine grades — always consult the product SDS/spec sheet for the exact material you buy.)
Molecular formula: C₁₂H₂₂N₂ (typical). 

Molar mass: ~194.3 g·mol⁻¹. 

Appearance: pale yellow to white solid or low-melting solid / viscous liquid depending on isomer mixture and purity. Supplier entries sometimes list white powder or low-melting waxy solid. 

Density: ~1.04 g·cm⁻³ (reported). 

Flash point: ~160 °C (closed cup values reported for typical grades). 

Amine value / basicity: being primary diamine, the material has two primary NH₂ groups (amine number ~ 500–600 mg KOH/g depending on purity and presence of tertiary/secondary amine impurities); exact amine equivalent must be measured for stoichiometric curing calculations. (See analytical section.)

Solubility: miscible/soluble with many aliphatic solvents and polar organic solvents; limited solubility in water (typical for heavy aliphatic diamines) but can be emulsified or solubilized with amine salts. 

Reactivity and role as a curing agent / intermediate
Epoxy curing behavior

TCD-diamine is primarily used as an aliphatic diamine epoxy hardener. As a primary diamine, it reacts with epoxide groups to form secondary amines and crosslinked poly(amine-epoxy) networks. 
Its aliphatic, non-aromatic backbone reduces discoloration/yellowing versus aromatic amines and provides good toughness and chemical resistance in cured systems. 
Because of its rigid tricyclic core, TCD-diamine imparts higher glass transition temperature (Tg) and reduced post-cure shrinkage compared with flexible linear aliphatic diamines of similar functionality. Patents and technical literature list TCD-diamine among valuable hardeners for low-yellowing, light-stable epoxy coatings and adhesives. 

Stoichiometry: two active primary amine hydrogens per amino group initially; use equivalent-based calculations (epoxy equivalent weight, EEW) to set stoichiometry (typical epoxy:amine ratios ~ stoichiometric 1:1 equivalents, but room-temperature/room-cure formulations often use slight excess epoxy or accelerator). 

Polyurethane and other derivatives
Diisocyanate route: TCD-diamine can be converted to TCD-diisocyanate (via phosgenation or safer phosgene substitutes) to give rigid aliphatic diisocyanates used in specialty polyurethanes. Patents cite TCD derivatives for light-stable polyurethane systems. 

Photocurable and UV/EB systems (via acrylates)
The corresponding TCD-dimethanol can be acrylated to give TCD-diacrylate monomers/oligomers used in high-refractive-index UV-curable inks and coatings — related chemistry indicates the TCD skeleton is valuable across curing chemistries (radical and step-growth). 

SAFETY INFORMATION ABOUT TCD DIAMINE

First aid measures:
Description of first aid measures:
General advice:
Consult a physician. 
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
 
If inhaled:
If breathed in, move person into fresh air. 
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately. 
Wash off with soap and plenty of water.
Consult a physician.
 
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
 
If swallowed:
Do NOT induce vomiting. 
Never give anything by mouth to an unconscious person. 
Rinse mouth with water. 
Consult a physician.
 
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
 
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment. 
 
Avoid breathing vapours, mist or gas. 
Evacuate personnel to safe areas.
 
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste. 
Keep in suitable, closed containers for disposal.
 
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
 
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place. 
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
 
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
 
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles. 
Faceshield (8-inch minimum). 
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
 
Skin protection:
Handle with gloves. 
Gloves must be inspected prior to use. 
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product. 
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. 
Wash and dry hands.
 
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
 
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls. 
 
If the respirator is the sole means of protection, use a full-face supplied air respirator. 
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so. 
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions. 
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
 
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company. 
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product