C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 5/03 (2006.01) C08G 18/08 (2006.01) C08G 18/16 (2006.01) C08G 18/24 (2006.01) C08G 18/42 (2006.01) C08G 18/80 (2006.01) C09D 175/06 (2006.01)
Patent
CA 2078610
A powder coating composition comprises 100 weight parts of the total of a polyester resin having a hydroxyl value in the range from 20 to 100 KOH mg/g and a blocked polyisocyanate compound, 0.01 to 3 weight parts of an organotin compound and 0.01 to 10 weight parts of a carboxylic acid compound having an acid value of 1000 KOH mg/g or less which can form a complex compound by reaction with the organotin compound. The amount of the polyester resin is in the range from 95 to 50 weight 96 and the amount of the blocked polyisocyanate compound is in the range from 5 to 50 weight % respectively based on the total of the polyester resin and the blocked polyisocyanate compound. A precoat steel plate is prepared by coating the powder coating composition described above on a steel plate by a electrostatic powder coating method to form a coating layer having a thickness in the range from 20 to 120 µm and curing the coating composition by baking at a temperature in the range from 190 to 300°C for a time in the range from 20 seconds to 10 minutes. The powder coating composition can be cured without formation of blisters and pin holes under a desired condition by controlling the rate of the curing reaction.
Okamoto Shingo
Sagawa Chiaki
Shimada Eiji
Basf Nof Coatings Co. Ltd.
Gowling Lafleur Henderson Llp
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