Useful resins are formed by the polymerization of polyfunctional amines and amides with formaldehyde. Thus, two important classes of amino resins are the condensation products of urea and of melamine with formaldehyde. They arc considered together because of the similarity in their production and applications. In general the melamine resins have somewhat better properties but are higher in price.
Chemistry & Production
Urea and formaldehyde undergo polymerization to afford a polymer with a common trade name “Beetle”. This polymer is considerably cross linked.
The first step in the preparation of urea formaldehyde resin is the reaction of urea with formaldehyde in aqueous solution to form methylol compound.