Isobutyl 3,5-diamino-4-chlorobenzoate

Isobutyl 3,5-diamino-4-chlorobenzoate (CAS 32961-44-7) is an aromatic diamine chain extender and curative, commercially known under trade names including RC 1604, Baytec 1604, Xylink 1604, Addolink 1604, and Baytec XL 1604. It carries no assigned E-code and is classified within the monomers and building blocks category.

In polyurethane and polyurea elastomer systems, this compound reacts with isocyanate-terminated prepolymers to extend and cross-link polymer chains, controlling hardness, elasticity, and mechanical strength. It is also employed in coatings and adhesive formulations where controlled cure kinetics and improved chemical resistance are required compared to faster-reacting amine curatives.

This material is supplied as a gray to dark gray particulate solid and is subject to REACH registration requirements for EU market supply. Procurement teams should confirm supplier documentation including Safety Data Sheets and certificates of analysis, with packaging formats typically available in drum or bag quantities depending on volume requirements.