p-Toluenesulfonyl Isocyanate (PTSI – CAS# 4083‐64‐1) Technical Data Sheet and Supply
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The reactivity of PTSI toward active hydrogen atoms makes it useful as a scavenger for water and other isocyanate reactive groups such as free acid in powdered aluminum alkanoates and active hydrogen present in carbon black pigments which cause polyurethane coatings, sealants and adhe‐ sives to thicken during storage.
PTSI is recommended especially for one‐component, low‐VOC polyure‐ thane coatings. The reaction of PTSI with water introduced from pigments and solvents in the paint formulation generates carbon dioxide and solu‐ ble inert chemical products. Experience has demonstrated that 13 grams of PTSI eﬀectively scavenges 1 gram of water. PTSI reacts with water in a 1 to 1 molar ratio, generating PTSA and carbon dioxide gas. This reaction occurs readily at room temperature and does not required heating. The PTSA generated in the process is essentially an inert material that does not further react with PTSI or other isocyanate groups, with the resultant formation of insoluble ureas.
Compatibility with paint binders should always be tested. This highly reactive sulfonyl isocyanate is also used as an intermediate in the synthe‐ sis of other useful chemical compounds. For further information, write or call for our bulletins “Urethane Applications” and/or “Chemical Reac‐ tions”.