Solid particle dispersions for imaging systems
Patent 5468598 Issued on November 21, 1995. Estimated Expiration Date: 
April 18, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 18, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2378283 2844486 3030370 3593927 3912517 Aqueous pigment dispersions Manufacture of polyester imide dispersions Process for dispersing sensitizing dyes Highly concentrated, stable, free-flowing aqueous dispersions of diazotizable aromatic amines bearing electrophilic substituents Photographic silver halide material containing a dye filter or a dye anti-halation layer InventorsApplicationNo. 228839 filed on 04/18/1994US Classes:430/372, Stabilizing241/16, To aid dispersion or prevent chemical reaction, deliquescence, agglomeration or frothing430/137.19, Milling, grinding, crushing, or comminuting in liquid430/495.1, RADIATION SENSITIVE PRODUCT430/510, Antihalation or filter layer containing430/513, Dissolvable or removable430/517, Organic dye or pigment containing430/531, Synthetic resin or cellulose derivative containing430/607, Stabilizing or fog inhibiting ingredient containing430/627Resin or synthetic polymer containingExaminersPrimary: Neville, Thomas R.Attorney, Agent or FirmForeign Patent References
International ClassG03C 011/00AbstractA process for preparing a stable, solid particle dispersion of a substantially water-insoluble compound useful in imaging, comprises the steps of:(a) forming a coarse aqueous slurry of solid particles of said compound and a hydrophobic, water-soluble or water-dispersible polymer in an amount of 0.1 to 100% by weight based on the weight of said compound; and(b) milling said slurry for time sufficient to provide particles of the desired average particle size;wherein the polymer is an uncharged or weakly anionically charged water-soluble or water-dispersible homopolymer or copolymer in which at least 10 mole % of the repeat units contain an uncharged pendant group that terminates in (a) a CH3 unit, (b) a ring containing at least two contiguous CH2 units, or (c) an aromatic group.The resulting dispersion has dispersed solid particles of said compound having the desired small particle size and is stable toward particle agglomeration, particle growth and needle growth.Other References
Field of SearchStabilizingAntihalation or filter layer containing Organic dye or pigment containing Dissolvable or removable Resin or synthetic polymer containing Stabilizing or fog inhibiting ingredient containing Synthetic resin or cellulose derivative containing To aid dispersion or prevent chemical reaction, deliquescence, agglomeration or frothing |
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