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. 16, 2004
Filed:
Jul. 03, 2000
Applicant:
Inventor:
Ted Y. Tsai, Harriman, NY (US);
Assignee:
International Paper Company, Purchase, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C 9/14 ; D21C 9/147 ; D21C 9/16 ;
U.S. Cl.
CPC ...
D21C 9/14 ; D21C 9/147 ; D21C 9/16 ;
Abstract
The invention relates to methods for reducing the amount of halogenated organics produced during a halogen bleaching process for lignocellulosic pulp fibers. According to the disclosed invention, it has been discovered that the use of a chelating agent prior to a non-halogen containing bleaching stage of a pulp bleaching process is effective to increase the brightness of the resulting bleached pulp without the need to increase the amount of halogen compounds required to obtain the same pulp brightness and without adversely affecting the pulp viscosity and yield.