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:
Jan. 04, 1977
Filed:
Oct. 17, 1975
Applicant:
Inventors:
Peter Dilling, Charleston, SC (US);
Gerald Prazak, Charleston, SC (US);
Assignee:
Westvaco Corporation, New York, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07G / ;
U.S. Cl.
CPC ...
2601 / ; 8 34 ; 8173 ; 8 83 ; 2601 / ;
Abstract
Disclosed herein is an improved process for producing sulfonated lignin surfactants for use as dispersants for disperse dyes and vat dyes. The improved process is to react a sulfonated lignin and epihalohydrin under certain conditions to block a portion of the free-phenolic hydroxyl group and at the same time cross-link the lignin molecules to increase the molecular weight. Another aspect of the process of this invention is to oxidize the thus treated lignin to stabilize its properties. Dispersants made according to this process have improved fiber staining and heat stability properties over other lignin-based dispersants.