POWDERY LACQUER AND COATING AND BONDING OBTAINED BY USING THE SAME

Coating powder (CP), comprising a mixture of (A) powdered polyisocyanate of formula R-Ä-R1-NCOÜn (I) which is solid at below 50 degrees C and liquid at above 160 degrees C. In (I) R = one of the groups of formulae (a), -NHCOOR2OCONH- (b), C2H5C(CH2OCONH-)3 (c), -NHCON(X)RrN(X)CONH- (d), with R2 = 2-...

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Zusammenfassung:Coating powder (CP), comprising a mixture of (A) powdered polyisocyanate of formula R-Ä-R1-NCOÜn (I) which is solid at below 50 degrees C and liquid at above 160 degrees C. In (I) R = one of the groups of formulae (a), -NHCOOR2OCONH- (b), C2H5C(CH2OCONH-)3 (c), -NHCON(X)RrN(X)CONH- (d), with R2 = 2-12C (cyclo)alkylene, and X = H and/or 1-12C (cyclo)alkyl; R1 = 1,4-cyclohexylene, bis-(4-cyclohexylene)- methane, isophoronedi-yl or alpha , alpha , alpha ', alpha '-tetramethylxylylene- diyl; n = 2-5; and (B) a powdered polyhydroxy component with solid/liquid limits as above, in which the ratio of sec. to prim. OH groups is at least 3:1, in a mix ratio such that the equiv. ratio of NCO:OH groups = (0.5:1)-(1.3:1).