Claims
- 1. A powder coating composition comprising an epoxy resin particulate material selected from the group consisting of particles having good chargeability and particles having poor chargeability, said particulate material 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 of said particles containing an epoxy resin and a curing agent for the epoxy resin, and a charge controlling agent selected from the group consisting of an acrylic resin having an average particle size in the range of 0.01-1 .mu.m, with the proviso that said acrylic resin is negatively chargeable in contact with iron powder when said epoxy resin particulate material has good chargeability and said acrylic resin is positively chargeable in contact with iron powder when said epoxy resin particulate material has poor chargeability, the amount of said charge controlling agent being 0.01-5% based on the total weight of said particulate material and said charge controlling agent, and said charge controlling agent being present on surfaces of said particles of said particulate material.
- 2. A composition according to claim 1, wherein said acrylic resin is 0.01-1.0% by weight based on the total weight of said acrylic resin and said particulate material.
- 3. A composition according to claim 1, wherein said acrylic resin has an average particle size in the range of 0.15-0.6 .mu.m.
Priority Claims (3)
Number |
Date |
Country |
Kind |
2-416980 |
Dec 1990 |
JPX |
|
3-32072 |
Jan 1991 |
JPX |
|
3-93447 |
Mar 1991 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 07/811,137, filed Dec. 20, 1991, now U.S. Pat. No. 5,204,387.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
389080 |
Sep 1990 |
EPX |
61-252276 |
Nov 1986 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Patent Abstracts of Japan, vol. 13, No. 442, Oct. 3, 1989. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
811137 |
Dec 1991 |
|