The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 1999
Filed:
Sep. 09, 1996
Masato Nishioka, Charlotte, NC (US);
Michel M Trawalter, Denver, NC (US);
Catherine S Ho, Charlotte, NC (US);
Livius T Percy, Charlotte, NC (US);
May N Szeto, Charlotte, NC (US);
Yi Lai Wang, Charlotte, NC (US);
Guido J Danhieux, Charlotte, NC (US);
Jon W Merkert, Charlotte, NC (US);
Dwayne R Myers, Belmont, NC (US);
Clariant Finance (BVI) Limited, Tortola, VG;
Abstract
Stable, pourable aqueous suspensions of solid particulate materials are provided, especially suspensions of sulfur dyes which are characterized a very low content of inorganic sulfides and inorganic polysulfides. The suspensions are produced using certain suspension stabilizing agents, particularly polysaccharides, such as xanthan gum, whose solutions in water are pseudoplastic. The suspensions may further comprise a non-sulfide reducing agent. An improved method is also provided for determining the the potential for such suspensions to release hydrogen sulfide upon being acidified at a given temperature, which method comprises acidifying a sample of the suspension to pH 2.9-3.7, capturing all of the hydrogen sulfide released during acidification in aqueous alkali and measuring the sulfide ion content of the aqueous alkali.