Powder coating composition comprising conventional epoxides with crystalline epoxides and curing agents
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United States of America Patent
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May 9, 1995
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N/A
app pub date -
Jul 15, 1993
filing date -
May 28, 1990
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Expired
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Abstract
A powder coating composition includes one or more crystalline substances the lowest melting point of which is Mp and one or more non-crystalline substances the lowest glass transition point of which is Tg and is lower than Mp, wherein the crystalline and non-crystalline substances are selected from epoxy resins and curing agents and bonded to each other. The bonding is effected by maintaining a powdery mixture containing the crystalline and non-crystalline substances at a temperature higher than Tg but lower than Mp and the softening point of any of the the non-crystalline substances, optionally under a pressure, and cooling and pulverizing the resulting mixture.
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