BASF Group: Chemical Intermediates: Polyurea Technology

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	Polyurea Technology

Polyurea is an elastomer made from two reactive components:

A-component		B-component*
Isocyanate prepolymers (MDIbased for aromatic systems, HDI- or IPDI-based for aliphatic systems)		Amines (polyetheramines) Amine chain extenders Additives (e.g. pigments, defoamers, flame retardants, etc.)

* BASF is the leading supplier of ingredients for the B-component.

The selection of the chain extender is of vital importance: these are secondary diamines that are less reactive than primary amines and therefore extend the gel time. At the same time they raise the polymerization level and cross-link density. This improves hydrolytic stability and produces water-tight films that show excellent mechanical and chemical stability.

Moreover, other additives can be part of the curing system when specific properties are requested. Those can be pigments, flame retardants or processing auxiliaries as defoaming.