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US 2010/0010151 A1Published application
Low gloss coil powder coating composition for coil coating
AssigneeDuPont Powder Coatings France SAS
InventorsRoger Fugier, Vincent Berger
Life of this patent
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Abstract
A powder coating composition obtainable by homogeneous mixing of at least two separately produced powder coating compositions as powder coating bases to yield coating compositions having good storage stability and coatings with controlled low gloss levels as well as high exterior durability and stable flexibility.
Claims6
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.
A process for preparing a powder coating composition comprising
- (A) 45 to 70 wt %, based on the total weight of the powder coating composition, of at least one powder coating base prepared from one or more saturated 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 prepared from one or more saturated carboxylic functional polyester resins having an acid value in the range of >25 to q 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 process comprises:
- (i) preparing component A) and component B) separately from each other by combining their respective ingredients into separate homogeneous mixtures;
- and
- (ii) homogeneously mixing component A) with component B) within said claim-defined wt % range to form the composition.
3 more elements
Dependencies are inferred from the claim text.