Polyester Polyols Polyester polyols Chemical Structure Composition Production Polyester polyols are typically produced by the condensation reaction of a glycol with a dicarboxylic acid. Main acids utilized are Adipic, Phtalic anhydride, Isophtalic, Terephtalic, Succinic, Sebacic Main glycols utilized are MEG, DEG, BDO, HDO, NPG, TMP. There are two different types of polyester polyols: Standard polyester polyols are typically quite viscous because of the nature […]
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Methylene Diphenyl Diisocyanate (MDI)
Methylene Diphenyl Diisocyanate is produced by a 4 steps reaction based on benzene as feedstock.
There are 3 isomers of MDI : 2,2-MDI, 2,4-MDI, and 4,4-MDI. The 4,4 isomer is known as pure or monomeric MDI (mMDI).The Polymeric MDI so called Crude MDI contains monomeric MDI and products with higher MW (pMDI).
MDI is used to produce foam for Insulation, PU elastomer, shoe soles, systems houses, synthetic leather, cold stores, sport floor, foundry, mining, …
MDI is the least hazardous of the commonly available isocyanates because of its low vapour pression but it is not benign.
Arpadis is one of the largest chemical distributor in Europe.
Arpadis is handling the storage, transport, export & import formalities of Methylene Diphenyl Diisocyanate globally.