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:
Mar. 03, 1998
Filed:
May. 02, 1996
Jelles Vincent Boskamp, Vlaardingen, NL;
Timothy Richard Bundy, Rotterdam, NL;
Marilena Coruzzi, Piacenza, IT;
Pauline Farnworth, Merseyside, GB;
Mark Phillip Houghton, Berkel en Rodenrijs, NL;
Christophe Joyeux, Rotterdam, NL;
Peter Cory Knight, Cheshire, GB;
Leandre Naddeo, Milan, IT;
Alistair Richard Sanderson, Cheshire, GB;
Lever Brothers Company, New York, NY (US);
Abstract
Particulate high bulk density non-spray-dried detergent compositions containing organic non-soap surfactant, zeolite builder and fatty acid soap as powder structurant, prepared by non-tower mixing and granulation processes involving in-situ neutralization of fatty acid to soap with aqueous sodium hydroxide, can suffer from localized particle yellowing on storage when perfume and/or fluorescer are present, due to the presence of areas of high alkalinity. Yellowing is reduced without loss of powder structuring if a defined, less than stoichiometric amount of sodium hydroxide is used for the fatty acid neutralization. Surprisingly, in bleaching powders improved bleach stability is also observed. The resulting powder can be defined in terms of a low 'basic sodium' content.