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. 01, 1997
Filed:
Sep. 28, 1994
Applicant:
Inventors:
Assignee:
Kao Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21E / ;
U.S. Cl.
CPC ...
162-5 ; 162-4 ; 162 56 ; 162 72 ; 510174 ; 510421 ; 252 60 ;
Abstract
A deinking method which comprises adding a specified nonionic surfactant having a specified solubility parameter as an essential component, during in the pulping step (the preceding step) and in any of the subsequent steps (the succeeding step). By use of the deinking surfactant composition and the deinking method of the present invention, an excellent deinking performance, including an elevated whiteness, a decrease in the number of unliberated large ink spots and an improved defoaming property of the flotation reject, can be achieved in deinking waste papers, in particular, waste OA papers and blends containing thereof.