Bonding of powder coating compositions
AssigneePPG Industries Ohio, Inc.
InventorJoseph Ferencz
Life of this patent
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Abstract
A method of producing a coating composition containing flake-like, color effect pigment particles and polymeric binder. The pigment composition has an initial size with fine particles. Upon mixing and heating the pigment composition to a temperature to achieve a second particle size distribution, the fine particles in the initial particle size distribution are bound to the larger particles in the pigment composition. The time and temperature of bonding the pigment composition can be adjusted to account for the chemistry of the polymeric binder and the loading of the flake-like, color effect pigment.
Claims20
A method of producing a powder coating composition comprising the steps of:
- (i) providing a pigment composition comprising flake-like, color effect pigment particles and a polymeric binder, said pigment composition having an initial particle size distribution with fine particles;
- (ii) mixing and heating the pigment composition to a temperature to achieve a second particle size distribution substantially without fine particles;
- and
- (iii) cooling the pigment composition from step (ii) to produce the powder coating composition.
A process for manufacturing a powder coating composition comprising the steps of:
- (i) providing a base composition comprising non-leafing pigment particles and a polymeric binder;
- (ii) mixing the base composition at an elevated temperature;
- (iii) adding flake-like, color effect pigment particles into the base composition to produce a pigment composition, the pigment composition having an initial particle size distribution with fine particles;
- (iv) heating the pigment composition to a temperature to achieve a second particle size distribution substantially without fine particles;
- (v) mixing the pigment composition produced in step (iv) at said temperature for a predetermined time period;
- and
- (vi) cooling the pigment composition from step (v) to produce the powder coating composition.
A powder coating composition comprising:
- non-leafing pigment particles;
- flake-like, color effect pigment particles;
- and
- a polymeric binder, wherein the powder coating composition has a particle size distribution determined as a function of particle count having two count modes.
Dependencies are inferred from the claim text.