Sub-Product

Ortho-rich MDI is a pure monomeric Diphenylmethane Diisocyanate containing 45~55% 2,4’-isomer content. Ortho Rich MDI, with a functionality of two, is a solvent-free, light yellow liquid when stored at 20~30℃. It is easily handled at room temperature. Ortho-rich MDIs with higher 2,4’- contents exhibit slower reaction rates with polyols, increased working times, improved compatibility with the polyol component, and produce prepolymers with lower viscosities due to the differential reactivity of the slower reacting 2’-Isocyanate which promotes end-capping of a Polyol vs. chain extension. Processors use Ortho-Rich MDI in the non-foam Polyurethane area as prepolymers for coating, adhesives and sealants, and in the flexible, semi-rigid Polyurethane foam area and related applications.