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:
Oct. 27, 2009
Filed:
Jul. 22, 2005
Heinz Giesecke, Odenthal, DE;
Bernhard Hunke, Eitorf, DE;
Heinz Giesecke, Odenthal, DE;
Bernhard Hunke, Eitorf, DE;
Kemira Oyj, , FI;
Abstract
A process for whitening paper in a size press includes contacting a cellulose sheet with a size press liquor that contains a surface size and a particular whitener containing sulfonate groups and cations, M, wherein at least 10% of all cations M have the formula in which Rto R, independently of one another, denote hydrogen, a C-C-alkyl radical or an optionally further substituted C-C-hydroxyalkyl radical, and Rdenotes an optionally further substituted C-C-hydroxyalkyl radical. The process provides superior paper whitening compared to a corresponding process in which the whitener cations are all sodium or potassium ions.