Patent ID: 7960482

Claim:
A powder coating composition comprising (A) 45 to 70 wt %, based on the total weight of the powder composition, of at least one powder coating base comprising one or more carboxylic functional polyester resins having an acid value in the range of 20 mg KOH/g, and from one or more glycidylester and/or glycidylether as hardener selected from the group consisting of triglycidyl trimellitate (TML), diglycidyl terephthalate (DGT) and glycidyl ethers based on aliphatic or cycloaliphatic epoxy resins, together with at least one coating additive, and optionally pigments and/or filler, wherein the powder coating base contains in the range of from 60 wt % to 67 wt % of the polyester resin, and (B) 55 to 30 wt %, based on the total weight of the powder coating composition, of at least one powder coating base comprising one or more carboxylic functional polyester resins having an acid value in the range of >25 to 100 mg KOH/g, and from one or more glycidylester and/or glycidylether as hardener selected from the group consisting of triglycidyl trimellitate (TML), diglycidyl terephthalate (DGT) and glycidyl ethers based on aliphatic or cycloaliphatic epoxy resins, together with at least one coating additive, and optionally pigment and/or filler, wherein the powder coating base contains in the range of from 40 wt % to 60 wt % of the polyester resin; wherein the powder coating composition is a homogeneous blend of (A) and (B) and wherein a cured layer of the powder coating composition passes test standard ECCA T7 with no cracks.