Silicon reactive oligomers and coating compositions made therefrom

A process for producing a coating on the surface of a substrate, said process comprising:

• applying a layer of a curable coating composition on said surface, wherein a binder in said composition comprises a silicon/hydroxy component and a crosslinking component, said silicon/hydroxy component consists essentially of:
• (I). A silicon/hydroxy reactive oligomer having a linear or branched non-epoxy containing cycloaliphatic moiety and at least two functional groups with at least one of said groups being a silicate and the remaining groups being hydroxyl groups;
• (II). A silicon reactive oligomer having a linear or branched non-epoxy containing cycloaliphatic moiety and having at least two functional groups being silicate or a combination of silane and silicate and a hydroxy acrylic polymer, a hydroxy polyester, a silicon free reactive oligomer having a linear or branched cycloaliphatic moiety and at least two hydroxyl groups or a combination thereof;
• or
• (III). A combination of said (I) and (II);
• wherein said silicon/hydroxy reactive oligomer, said silicon reactive oligomer and said silicon free reactive oligomer all having a GPC weight average molecular weight not exceeding 4,000 and a polydispersity not exceeding about 1.7;
• and said crosslinking component comprising a blocked crosslinker or an unblocked crosslinker;
• wherein said blocked or unblocked crosslinkers being provided with at least two isocyanate groups and wherein the ratio of equivalents of isocyanate per equivalent of hydroxyl groups is in the range of from 0.3/1 to 2.0/1.

A curable coating composition comprising a binder, which comprises:

• a silicon/hydroxy component and a crosslinking component, said silicon/hydroxyl component comprising:
• (I). A silicon/hydroxy reactive oligomer having a linear or branched non-epoxy containing cycloaliphatic moiety and at least two functional groups with at least one of said groups being a silane or a silicate, the remaining groups being hydroxyl groups;
• (II). A silicon reactive oligomer oligomerized by the reaction of a multifunctional alcohol having a linear or branched non-epoxy containing cycloaliphatic moiety with isocyanato silane compound;
• wherein said silicon/hydroxy reactive oligomer, and said silicon reactive oligomer all having a GPC weight average molecular weight not exceeding 4,000 and a polydispersity not exceeding about 1.7;
• and
• said crosslinking component comprising a blocked crosslinker or an unblocked crosslinker;
• wherein said blocked or unblocked crosslinker being provided with at least two isocyanate groups and wherein the ratio of equivalents of isocyanate per equivalent of hydroxyl groups is in the range of 0.3/1 to 2.0/1.