Process for producing titanium dioxide pigment for photograph and photographic support comprising same
Patent 5264033 Issued on November 23, 1993. Estimated Expiration Date: 
June 13, 2011. 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.
June 13, 2011. 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 3862297 Process for preparing polyolefin resin-coated paper for photographic use Photographic support with titanium dioxide pigment polyolefin layer on a substrate Process for the production of TiO2 pigments Method of producing titanium oxides Titanium dioxide aggregates process for producing same and electrophotographic photosensitive material containing same Patent #: 5173386 InventorsAssigneeApplicationNo. 714847 filed on 06/13/1991US Classes:106/447, Organic material containing106/436, Titanium compound containing (Ti)423/610, Titanium dioxide423/615, Utilizing titanium sulfate as reactant423/616, And utilizing acid428/328, Heavy metal or aluminum or compound thereof430/531, Synthetic resin or cellulose derivative containing430/536Polymer of unsaturated monomerExaminersPrimary: Thibodeau, Paul J.Assistant: Le, H. Thi Attorney, Agent or FirmForeign Patent References
International ClassC09C 001/36Foreign Application Priority Data1990-06-20 JPAbstractDisclosed is a process for producing a titanium dioxide pigment used for a resin-coated paper type photographic support, comprising the following steps:(a) a step of adding at least one alkaline earth metal compound in an amount of 0.01-2.0% by weight in terms of a metal oxide based on the titanium dioxide before calcination step and(b) an acid-washing step of washing the titanium dioxide at acidic state after the calcination step and before a step of surface treatment with a hydrated metal oxide,and wherein particle size of the titanium dioxide pigment is 0.110-0.150 μm shown by number-average diameter obtained by measuring the diameter in a certain direction using an electron microscope.A photographic support which comprises the above titanium dioxide pigment is also disclosed.Occurrence of die lip stain and microgrit are substantially restrained in this photographic support and a photographic material made of it shows improved image sharpness.Other References
Field of SearchIncluding a second component containing structurally defined particlesPolymeric or resinous material Heavy metal or aluminum or compound thereof Of base or substrate Including synthetic resin or polymer layer or component Metal-compound-containing layer O-containing Synthetic resin or cellulose derivative containing Polymer of unsaturated monomer Inorganic coating Heating or drying (e.g., polymerizing, vulcanizing, curing, etc.) Inorganic coating Metal-containing coating And utilizing acid Utilizing titanium sulfate as reactant Titanium dioxide Treating with compound containing alkali metal or alkaline earth metal Titanium compound containing (Ti) Organic material containing |
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