Aliphatic ceramics dispersant
AssigneeLubrizol Advanced Materials, Inc.
InventorsElliot Coulbeck, Dean Thetford
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Abstract
The invention provides dispersed inorganic mixed metal oxide pigment compositions in a hydrocarbon media utilizing a dispersant having polyisobutylene succinic anhydride structure reacted with a non-polymeric amino ether/alcohol to disperse a mixed metal oxide pigment in the media. The metal oxide pigment is of the type used to color ceramic or glass articles. A milling process using beads is also described to reduce the mixed metal oxide particle size to the desired range. A method of using the mixed metal oxide dispersion to digitally print an image on a ceramic or glass article using the dispersion jetted through a nozzle and subsequently firing the colored article is also described.
Claims10
A pigment dispersion composition comprising:
- a) 20-79 wt. % of a continuous phase liquid hydrocarbon media;
- b) 20-60 wt. % of a mixed metal oxide ceramic pigment in particulate form that develops its full color intensity and hue after firing at elevated temperatures;
- and
- c) 0.1-20 wt. % dispersant, said dispersant comprising the reaction product of polyisobutylene with maleic acid and/or anhydride of maleic acid under reaction conditions for form a polyisobutylene with dicarboxylic acid or succan anhydride groups chemically bonded thereto knowns as PIBSA, polyisobutylene succan;
- this polyisobutylene succan is reacted on a non-polymeric amino ether/alcohol in a molar ratio of 1:0.9 to 1:1.1 of anhydrides of the PIBSA to non-polymeric amino ether/alcohol to form said dispersant.
A process for milling an inorganic mixed metal oxide particulate, having a dry powder volume average particle diameter D50 in excess of 2 micron, in a continuous hydrocarbon medium to a D50 particle size of less than 600 nanometers, said process comprising:
- a) blending said continuous hydrocarbon medium, said inorganic mixed metal oxide particulate, wherein said inorganic mixed metal oxide particulate is a mixed metal oxide pigment that develops its color intensity and hue after firing at elevated temperatures, and a dispersing agent comprising a reaction product of polyisobutylene with maleic acid and/or maleic anhydride and thereafter said acid or anhydride being reacted with a non-polymeric amino ether/alcohol to form at least one of ester, amide, imide and salt bonds between the amino ether/alcohol and said reaction product of polyisobutylene with maleic acid and/or maleic anhydride, optionally said hydrocarbon medium, mixed metal oxide particulate and dispersing agent including a vitreous glaze material, having a dry powder volume average particle diameter in excess of 2 micron;
- b) milling said mixed metal oxide pigment dispersed with said dispersing agent in said continuous medium using a bead mill for 5 minutes to 60 hours forming a dispersion of said mixed metal oxide in said continuous medium;
- and
- c) confirming the volume average particle diameter D50 is less than 600 nanometers.
Dependencies are inferred from the claim text.