MASSAS PARA REVESTIMENTO DE ENDURECIMENTO AO CALOR

Heat-hardening coating composition contains (A) a carboxyl-functional polyester obtained by condensing (cyclo)aliphatic polyols with (cyclo)aliphatic or aromatic polycarboxylic acids and anhydrides, the polyester having a Tg in the range 30-80 degrees C and an acid no. of 20-100 mgKOH/g; (B) a b-hydroxyalkylamide, in which the equivalent ratio of b-hydroxy alkylamide to carboxylic acid is 0.6-1.6:1; and (C) a compound of formula (I)-(X) or their mixtures, (where in (I): R1 = OH; R2 =OR7; R3-R7 = H or 1-10C alkyl or halogen; in (II): R1 =OH; R4 = OR7; R2-R7 = H or 1-10C alkyl or halogen; in (III): R1 = OH; R2 =OR9; R3-R9 = H or 1-10C alkyl or halogen; in (IV): R1 = OH; R4 = OR9; R2-R9 = H or 1-10C alkyl or halogen; in (V): R1 = OH; R8 =OR9; R2-R9 = H or 1-10C alkyl or halogen: in (VI): R2+OH; R6 =OR9; R2-R9=and R1 except R4 H or 1-10C alkyl or halogen: in (VII) R1 = OH; R4 = OR11; R2-R11 H, 1-10C alkyl or halogen; in (VIII): R2 = OH; R6 = OR11; R1 and R3-R11, except R2 and R6 = H, 1-10C alkyl or halogen; in (IX): R9 =OH; R10=OR11; R1-R11, except R9 and R10=H, 1-10C alkyl or halogen; and in (X): R9 =OH; R10=OR11; R1 - R11= H or 1-10C alkyl or halogen); and optionally pigments, fillers and heat stabilisers, preferably phosphate or tribo additives and further additives. Production of powder lacquers is also claimed.