摘要:
The invention is directed to coating compositions comprising A) at least one hydroxyl-functional and optionally acid-functional binder, preferably with an acid number of 0 to 150 mg KOH/g binder solids, B) at least one polyisocyanate curing agent with free isocyanate groups, C) at least one thermally latent tetrahydrocarbyl tin catalyst of general formula (I) RnR′4-nSn (I) wherein R is an alkyl group, R′ is an aryl, arylalkyl or alkenyl group and n is 1, 2 or 3, and D) optionally at least one acid-functional compound, that is different from component A), with the proviso that the acid number of a composition, consisting of the at least one binder A) and optionally of the at least one acid-functional compound D), has an acid number of at least 5 mg KOH/g solids, preferably of least 10 mg KOH/g solids, and to a process for coating substrates comprising the steps: I) applying the coating composition to an optionally pre-coated substrate, and II) curing the applied coating composition by means of thermal energy.
摘要:
The invention is directed to coating compositions comprising A) at least one hydroxyl-functional and optionally acid-functional binder, preferably with an acid number of 0 to 150 mg KOH/g binder solids, B) at least one polyisocyanate curing agent with free isocyanate groups, C) at least one thermally latent tetrahydrocarbyl tin catalyst of general formula (I) RnR′4-nSn (I) wherein R is an alkyl group, R′ is an aryl, arylalkyl or alkenyl group and n is 1, 2 or 3, and D) optionally at least one acid-functional compound, that is different from component A), with the proviso that the acid number of a composition, consisting of the at least one binder A) and optionally of the at least one acid-functional compound D), has an acid number of at least 5 mg KOH/g solids, preferably of least 10 mg KOH/g solids, and to a process for coating substrates comprising the steps: I) applying the coating composition to an optionally pre-coated substrate, and II) curing the applied coating composition by means of thermal energy.
摘要:
The invention is directed to solvent-based coating compositions comprising a binder component and a crosslinking component, wherein the binder component comprises at least one hydroxy-functional polyether A) having at least two secondary hydroxyl groups per molecule, a number average molecular weight Mn in the range of 200 to 5,000 and a polydispersity of
摘要:
Described in this invention is a catalytic process for making amide acetals from nitrites and diethanolamines. Amide acetals can be further crosslinked by hydrolyzing the amide acetal groups, and subsequently reacting the hydroxyl groups and/or the amine functions that are formed, to crosslink the composition.
摘要:
The invention is directed to coating compositions comprising: A) 20–80 wt-% of at least one orthoester compound having at least one non-cyclic orthoester group and at least one hydroxyl group per molecule, which compound is obtained by reacting a) at least one orthoester compound with b) at least one diol with a number average molecular weight (Mn) of 200–1000 g/mol, wherein solely diols are used having hydroxyl groups with different reactivity and having more than 3 carbon atoms between the hydroxyl groups, B) 0–40 wt-% of at least one hydroxy-functional binder and/or hydroxy-functional reactive diluent, different from component A) and C) 80–20 wt-% of at least one cross-linking agent with functional groups reactive with hydroxyl groups.
摘要:
Described in this invention is a catalytic process for making amide acetals from nitrites and diethanolamines. Amide acetals can be further crosslinked by hydrolyzing the amide acetal groups, and subsequently reacting the hydroxyl groups and/or the amine functions that are formed, to crosslink the composition.
摘要:
Coating compositions comprising: A) least one hydroxy-functional polyester with at least two hydroxyl groups per molecule, wherein at least one of which hydroxyl groups is a tertiary hydroxyl group, and the polyester has a number average molecular weight Mw of 200 to 5000, and contains as a structural element 10-90 wt-%, relative to the total quantity of polyester, of at least one acid ester group comprising a tertiary hydroxyl group and of the following general formula I wherein R1 is a single bond or a C1-C6 alkyl group, R2 and R3 mutually independently mean a C1-C4 alkyl group, B) optionally, at least one additional hydroxy-functional binder other than A) and C) at least one cross-linking agent which is capable of entering into a cross-linking reaction with the OH-groups of components A) and B.
摘要:
The invention is directed to coating compositions comprising: A) 20-80 wt-% of at least one orthoester compound having at least one non-cyclic orthoester group and at least one hydroxyl group per molecule, which compound is obtained by reacting a) at least one orthoester compound with b) at least one diol with a number average molecular weight (Mn) of 200-1000 g/mol, wherein solely diols are used having hydroxyl groups with different reactivity and having more than 3 carbon atoms between the hydroxyl groups, B) 0-40 wt-% of at least one hydroxy-functional binder and/or hydroxy-functional reactive diluent, different from component A) and C) 80-20 wt-% of at least one cross-linking agent with functional groups reactive with hydroxyl groups.
摘要:
The present invention is directed to a process of applying a solvent-based coating composition on a substrate to produce a multi-layer coating thereon. The binder component of the composition includes at least one hydroxy-functional polyether obtained from at least one polyol having at least three hydroxyl groups and at least one monoglycidyl ester of a branched monocarboxylic acid. The crosslinking component of the composition includes at least one cross-linking agent that is capable of entering into a cross-linking reaction with the hydroxyl groups of- the hydroxy-functional polyether. The process further includes curing the multi-layer coating. The process is well suited for producing clear coats and pigmented topcoats in automotive refinishing.