Thermosetting powder coating composition.

摘要

The invention provides a powder coating composition characterised by: (a) about 1 percent to about 25 percent by weight based on the weight of resin solids of a first acid group-containing polymer having a Tg in the range of about -20 DEG C to about 30C; (b) about 40 percent to about 75 percent by weight based on weight of resin solids of a second acid group-containing polymer having a Tg in the range of about 40C to about 100 DEG C; and (c) a curing agent capable of reacting with acid groups in (a) and (b) to form a cross-linked product. The invention also includes a method of preparing a powder coating composition including the preparation of a polymer blend of components (a) and (b) and forming a co-reactable mixture of the blend with a curing agent capable of reacting with acid groups in the polymer blend to form a crosslinked product.