p-toluenesulfonyl isocyanate
CAS Number
4083-64-1
EC Number
223-810-8
Abbreviation
PTSI
What is p-toluenesulfonyl isocyanate?
p-Toluenesulfonyl isocyanate (CAS 4083-64-1), also known as tosyl isocyanate or PTSI, is a reactive isocyanate reagent.
Where is p-toluenesulfonyl isocyanate used?
- Coatings and adhesives: crosslinker that improves chemical resistance and film hardness without elevated cure temperatures
- Sealants and elastomers: moisture scavenger that extends pot life and shelf stability
- Textile and leather finishing: bonds functional coatings to fiber substrates via surface hydroxyl groups
- Polymer manufacturing: reactive building block in specialty monomers
- It reacts with hydroxyl and amine groups to build or stabilize polymer networks.
Commercial specifications
- Technical grade, purity typically 97% upward
- Packaging from small reagent quantities to drum-scale volumes
Other Names (Synonyms)
Tosyl isocyanate|4-Methylbenzenesulfonyl isocyanate|p-Toluenesulphonyl isocyanate|Benzenesulfonyl isocyanate, 4-methyl-|Additive ti|H9004FJX6V|p-Toluenesulfonic acid, anhydride with isocyanic acid|PTSI
What are the physical properties of p-toluenesulfonyl isocyanate?
Melting Point 188-189 °C
Boiling Point 75-80 °C @ Press: 0.05-0.1 Torr
Density 3.877 g/cm³ @ Temp: 827 °C
Flash Point >230 °F
Appearance clear liquid
Color Clear colorless to yellow
Odor acrid odor
Form Liquid
Water Solubility reacts
Vapor Pressure 1 mm Hg ( 100 °C)
Refractive Index n 20/D 1.534(lit.)
Log P 0.6 at 30℃
How is p-toluenesulfonyl isocyanate classified and handled safely? Learn More
Danger
GHS07· Irritant GHS08· Health Hazard GHS06· Toxic
Hazard Statements
H315 Causes skin irritation
H317 May cause an allergic skin reaction
H319 Causes serious eye irritation
H330 Fatal if inhaled
Precautionary Statements
P233 Keep container tightly closed.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
Which trade and regulatory codes apply to p-toluenesulfonyl isocyanate?
HS Code 29309090
UN Number 2206
ADR Class 6.1
Packing Group III
Storage Class 10 - Combustible liquids
WGK (Germany) 1