Non-stoichiometric ytterbium phosphate powder of low infrared re

Details Non-stoichiometric ytterbium phosphate powder of low infrared re Non-stoichiometric ytterbium phosphate powder of low infrared re

1997-08-20

1999-06-15

Tucker, Philip

Compositions

Light transmission modifying compositions

Inorganic crystalline solid

252587, 423263, 423 211, 423 215, G02B 520, C01F 1700, C09D 1100

Patent

active

059119217

ABSTRACT:
Proposed is a powder of ytterbium phosphate having a non-stoichiometric phosphorus to ytterbium molar ratio of 1.08 to 2.0 and having a specified average particle diameter and specified diameter of the crystallites forming the particles. The powder is useful as an infrared-absorbing pigment in a printing ink invisible to naked eyes but detectable by an infrared detecting means for printing of stealth bar code patterns. The ytterbium phosphate powder can be prepared in a convenient and inexpensive method utilizing the precipitation reaction by mixing an aqueous phosphoric acid solution and ytterbium salt solution under specified conditions followed by calcination of the precipitates at a specified temperature and pulverization of the calcined precipitates to give the specified average particle diameter.

REFERENCES:
patent: 5415851 (1995-05-01), Kimura et al.
patent: 5470503 (1995-11-01), Braconnier
patent: 5569531 (1996-10-01), Ohiwa et al.
patent: 5746944 (1998-05-01), Braconnier
European Search Report along with ANNEX to the European Search Report on European Patent Application No. EP 97402052; date of search Nov. 7, 1997 Place of Search "The Hague"; Examined by: B. Rigondaud, (1997).
Chemical Abstracts, vol. 125, No. 22, Nov. 25, 1996; abstract No:278841; Tajima Shinji Et al., "Ytterbium Phosphate Infrared-Absorbing Materials, Their Manufacture, Inks, Invisible Paterns and Information Patterns Containing Them" XP002044211; & JP08209110A (Dainippon Co., Ltd) Aug. 13, 1996.
Database WPI, Section CH, Week 9517; Derwent Publications Ltd., GB; Class G02, AN 95 128628; XP002044212 & JP 07053946A (Dainippon Printing Co) Feb. 28, 1995.
Chemical Abstracts, vol. 95, No. 2, Jul. 13, 1981; Columbus, OH, US; Abstract No.: 17205e; Hukuo Keniti Et al., "Syntheses of Rare Earth Orthophosphates (RPO4.nH2O,R=La-Yb, n=0-2)"; XP002046104 abstract & Nagoya Kogyo Daigaku Gakuko, vol. 31, 1980, pp. 175-182.
Chemical Abstracts, vol. 125, No. 4; Jul. 22, 1996; Columbus. Ohio US; Abstract No. 44624; Kimura Juji et al.; "Rare Earth Element Phosphate Salt particles and their manufacture"; XP002044229 and abstract JP08059217A (Shinetsu Chem. Ind Co.) Mar. 5, 1996.

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