Use of aminoplasts in coatings

During the cross-linking process, the film forming reactions involved are mainly of two types polymer-aminoplast cross-linking and aminoplast-aminoplast cross-linking. The reactions involved between aminoplast and polymer are represented schematically in 

MFs are the most widely used amino cross-linkers in the coating industry due to good mechanical properties, good chemical resi- 

BF cross-linkers are used where a combination of film flexibility and hardness is required along with good resistance to corrosion, humidity and chemicals. Due to their high cost and poor exterior durability, their use is limited to specific applications where the above merits are of prime importance and exterior durability is not a concern, such as internal can linings, coil coatings (primers only) and electro-deposition primers. 

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