Epoxy powder coating composition for use in electrostatic coating
AssigneeSomar Corporation
InventorsKunimitsu Matsuzaki, Seitaro Iwamoto, Takeshi Watanabe, Kazuya Ono, Katsuji Kitagawa
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Abstract
A powder coating composition is disclosed which includes a particulate material containing an epoxy resin and a curing agent, and fine powder of a charge controlling agent such as an acrylic resin, silica or a mixture thereof. The charge controlling agent is deposited on surfaces of the particles of the particulate material. Additionally, a powder coating composition is disclosed in which two different charge controlling agents are used and are separately deposited on different particles of epoxy resin consisting particulate material.
Claims8
A powder coating composition comprising:
- a first particulate material consisting of first particles having a particle size in the range of 3-180 .mu.m and a volume resistivity of at least 10.sup.7 ohm.cm and each containing a first epoxy resin and a first curing agent for the first epoxy resin;
- a second particulate material consisting of second particles having a particle size in the range of 3-180 .mu.m and a volume resistivity of at least 10.sup.7 ohm.cm and each containing a second epoxy resin and a second curing agent for the second epoxy resin;
- a first, particulate, charge controlling agent deposited on surfaces of said first particulate material;
- and
- a second, particulate, charge controlling agent deposited on surfaces of said second particulate material, said first and second charge controlling agent differing in static characteristics from each other.
Dependencies are inferred from the claim text.