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. 12, 2011
Filed:
Dec. 18, 2006
Caifang Yin, Mason, OH (US);
Kent Witherspoon, Killen, AL (US);
Caifang Yin, Mason, OH (US);
Kent Witherspoon, Killen, AL (US);
International Paper Company, Memphis, TN (US);
Abstract
This invention relates to an improved bleaching process for bleaching pulp comprising at least one bleaching stage which comprises treating a softwood pulp with a bleaching agent comprising ClOin the presence of a weak base such as, for example, Mg(OH)preferably at pH from about 3.5 to about 6.5. The invention is also relates a bleaching process for bleaching pulp having two or more bleaching stages, at least one of which and preferably two of which comprises treating a softwood pulp with a bleaching agent comprising ClOin the presence of a weak base such as, for example, Mg(OH)preferably at pH from about 3.5 to about 6.5.