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    • 4. 发明申请
    • POWDER COATING MATERIALS
    • 粉末涂料
    • US20090136737A1
    • 2009-05-28
    • US11995502
    • 2006-07-11
    • John RingSteven Antony SpencerAndrew George Cordiner
    • John RingSteven Antony SpencerAndrew George Cordiner
    • B32B5/16B29B9/00
    • C09D5/031C09D5/033C09D163/00Y02P20/582Y10T428/25Y10T428/2982C08L2666/54
    • The present invention pertains to a powder coating material comprising particles having a particle size distribution which satisfies the following equation: [d(s,90)/d(s,10)]2÷[d(s,90)−7]≦3.5 and in which d(s,90) is greater than 7 μm, d(s,90) and d(s,10) being measured in microns. The powder coatings can be obtained via a grinding-classification process or an agglomeration process. In a preferred embodiment the particles are prepared by a process which comprises mechanical fusion of a powder coating material, wherein the powder is brought to a maximum temperature in the range of from the Tg of the powder to 15° C. above the Tg, at a heating rate for at least the last 3° C., preferably at least the last 4° C., up to the maximum temperature of no more than 4° C. per minute, and after a period in the range of from 0 to 40 minutes at the maximum temperature the powder is cooled.
    • 本发明涉及包含粒度分布满足以下等式的颗粒的粉末涂料:[d(s,90)/ d(s,10)] 2 / [d(s,90)-7] = 3.5,其中d(s,90)大于7μm,d(s,90)和d(s,10)以微米计。 粉末涂料可以通过研磨分级方法或凝聚过程获得。 在优选的实施方案中,颗粒通过包括粉末涂料的机械熔融的方法制备,其中将粉末的最大温度设定在高于Tg的15℃以上的范围内,在 至少最后3℃,优选至少最后4℃,至最高温度不超过4℃/分钟的加热速率,并且在0至 在最高温度下40分钟,粉末被冷却。