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What is a polyurea coating?

In your March 2003 article entitled "100% Solids Polyurethane and Polyurea Coatings Technology," there was a very misleading definition of pure polyurea attributed to the Polyurea Development Association (PDA). We would like to set the record straight. The PDA definition does not allow for 20% polyol in the resin side as described in the article, rather no intentional polyol is allowed in pure polyurea formulations. The PDA definition is:

"A polyurea coating/elastomer is that derived from the reaction product of an isocyanate component and a resin blend component. The isocyanate can be aromatic or aliphatic in nature. It can be monomer, polymer or any variant reaction of isocyanates, quasi-prepolymer or a prepolymer. The prepolymer, or quasi-polymer, can be made of an amine-terminated resin, or a hydroxyl-terminated polymer resin.

The resin blend must be made up of amine-terminated polymer resins, and/or amine-terminated chain extenders. The amine terminated polymer resins will not have any intentional hydroxyl moieties. Any hydroxyls are the result of incomplete conversion to the amine-terminated polymer resins. The resin blend may also contain additives, or non-primary components. These additives may contain hydroxyls, such as pre-dispersed pigments in a polyol carrier. Normally, the resin blend will not contain a catalyst(s)."

Additional information, including the definition of pure polyurea, can be found on the PDA web site at www.pda-online.org.

--Ray Scott, president

Polyurea Development Association

Kansas City, MO
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Author:Scott, Ray
Publication:Coatings World
Article Type:Letter to the Editor
Date:Aug 1, 2003
Words:232
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