Reactive flow agent for powder coatings
AssigneeBASF SE
InventorsPeter D. Clark, Cynthia A. Stants, Richard J. Foukes
Life of this patent
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Abstract
The present invention relates to a thermoset powder coating composition and method of application. The coating includes a copolymer having a reactive functionality selected from the group consisting of epoxy, carboxy, and hydroxy functionalities and mixtures thereof, a suitable crosslinking agent capable of reaction with the reactive functionality on the copolymer, and an aliphatic or aromatic crystalline, hydroxyl containing compound having a melting point of between 30.degree. C. and 150.degree. C. and a flow control agent. The powder coating is a pigmented or clear coat powder composition applied over a primer layer.
Claims11
A thermosetting powder coating composition comprising a solid particulate mixture of
- a) a film-forming resinous binder including
- i) a copolymer selected from the group consisting of epoxy, polyester and acrylic copolymers having a reactive functionality selected from the group consisting of epoxy, carboxy, and hydroxy functionalities and mixtures thereof and
- ii) a crosslinking agent capable of reacting with the reactive functionality on copolymer (i) selected from the group consisting of aminoplasts, blocked aliphatic diisocyanates, aromatic diisocyanates, acid anhydrides, dicyandiamide and its derivatives and mixtures thereof,
- b) a first flow control agent which is an aliphatic or aromatic hydroxyl containing crystalline compound having a melting point between 30.degree. C. and 150.degree. C. and
- c) a second, flow control agent different from the first flow control agent.
A thermosetting powder coating composition comprising a solid particulate mixture of
- a) a film-forming resinous binder including
- i) a copolymer selected from the group consisting of epoxy, polyester and acrylic copolymers having a reactive functionality selected from the group consisting of epoxy, carboxy, and hydroxy functionalities and mixtures thereof and
- ii) a crosslinking agent capable of reacting with the reactive functionality on copolymer (i) selected from the group consisting of aminoplasts, blocked aliphatic diisocyanates, aromatic diisocyanates, and mixtures thereof,
- b) a first flow control agent which is an aliphatic or aromatic hydroxyl containing crystalline compound having a melting point between 30.degree. C. and 150.degree. C., selected from the group consisting of trimethylolpropane, neopentyl glycol, (pentaerythritol), 2,5 dimethyl-2,5-hexanediol, 2,4,6-triphenylphenol, 2, 2' biphenol, 9-phenanthrol and p-cresol and
- c) a second, flow control agent, different from the first flow control agent.
Dependencies are inferred from the claim text.