Modified aminoplast crosslinkers and powder coating...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 12/40 (2006.01) C08G 12/26 (2006.01) C08G 18/54 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01) C08L 61/26 (2006.01) C08L 61/32 (2006.01) C09D 161/26 (2006.01) C09D 161/32 (2006.01)

Patent

CA 2455782

A crosslinking agent is provided, prepared by reacting (A) an aminoplast resin; (B) a reactive urethane group-containing adduct and (C) at least one other compound having active hydrogen groups reactive with aminoplast resin (A). Compound (C) is selected from: (i) compounds having the structure (I), wherein X is aromatic; R1, R2, and R3 each independently represents H, (cyclo)alkyl having from 1 to 12 carbon atoms, aryl, alkaryl, aralkyl, or an active hydrogen-containing group, (ii) compounds having the structure (II) or (III), where R' and R" each independently represents an aromatic group or an alkyl group having 1 to 12 carbon atoms; and (iii) compounds different from (i) and (ii), having a melting point of at least 80 ~C. Further provided are methods for preparing the crosslinking agent curable compositions containing the crosslinking agent, and coated substrates.

La présente invention concerne un agent de réticulation préparé par la réaction (A) d'une résine aminoplaste ; (B) d'un adduit contenant un groupe uréthane réactif et (C) d'au moins un autre composé comprenant des groupes hydrogène actif qui réagissent avec la résine aminoplaste (A). Le composé (C) est sélectionné parmi: (i) des composés présentant la structure (I) dans laquelle X représente un constituant aromatique; R?1¿, R?2¿, et R?3¿ représentent chacun indépendamment H, (cyclo)alkyle comprenant de 1 à 12 atomes de carbone, aryle, alcaryle, aralkyle ou un groupe contenant de l'hydrogène réactif, (ii) des composés présentant la structure (II) ou (III), dans laquelle R' et R" représentent chacun indépendamment un groupe aromatique ou un groupe alkyle comprenant de 1 à 12 atomes de carbone; et (iii) des composés différents de (i) et de (ii), qui ont un point de fusion au moins égal à 80 ·C. La présente invention concerne également des procédés de préparation des compositions durcissables d'agent de réticulation contenant ledit agent de réticulation et des substrats recouverts.

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