Polymethylene polyphenyl polyisocyanate CAS#9016-87-9
Polyphenyl polymethylene polyisocyanate, also known as PAPI or crude MDI, is an important chemical raw material. It typically appears as a light yellow to dark brown viscous liquid or a brown transparent liquid with a pungent odor.
It is a mixture consisting of approximately 50% MDI and 50% polyisocyanate, with an average functionality greater than 2. Its density is approximately 1.1–1.2 g/cm³ at 20–25°C, and its boiling point is about 373.4°C at 760 mmHg or 392°C at 5 mmHg.
Product Application of Polymethylene Polyphenyl Polyisocyanate CAS#9016-87-9
Polymethylene polyphenyl polyisocyanate is used in the production of polyurethane materials. It is widely used in the construction, automotive, and electrical industries, where it serves as an insulation material and is also used in products such as mattresses.
Applications
Isocyanate Synthesis: Precursor for isocyanates and isocyanurate structures.
Carbamate & Urethane Chemistry: Building block for carbamates, urethanes, and polyurethane systems.
Agrochemical & Pharmaceutical Intermediates: Raw material for nitrogen-functional compounds.
Cyanate Derivatives: Intermediate for cyanate esters and related resins.
Fine Chemical Synthesis: Reagent in specialty organic synthesis.
