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:
Feb. 10, 2009
Filed:
Aug. 17, 2004
Cornel Hagiopol, Lilburn, GA (US);
Yuping Luo, Duluth, GA (US);
David F. Townsend, Grayson, GA (US);
James W. Johnston, Suwanee, GA (US);
Clay E. Ringold, Decatur, GA (US);
Karla D. Favors, Atlanta, GA (US);
Cornel Hagiopol, Lilburn, GA (US);
Yuping Luo, Duluth, GA (US);
David F. Townsend, Grayson, GA (US);
James W. Johnston, Suwanee, GA (US);
Clay E. Ringold, Decatur, GA (US);
Karla D. Favors, Atlanta, GA (US);
Other;
Abstract
Compositions comprising a blend of two or more paper strengthening agents have improved stability compared with previously known paper strengthening agents. One component is a polymeric paper strengthening agent, preferably a wet strengthening agent. The other component is a stabilized glyoxalated polyacrylamide prepared by (1) reacting a first portion of glyoxal with a polyacrylamide having pendant amide groups to form a first reaction mixture comprising glyoxalated polyacrylamide; (2) adding an acid to the first reaction mixture to form a second reaction mixture having a reduced pH and comprising the glyoxalated polyacrylamide; and (3) adding a second portion of glyoxal to the second reaction mixture to form the stabilized glyoxalated polyacrylamide. If desired, an aldehyde scavenger can be included in one or more of step (1), step (2), step (3), or the stabilized glyoxalated polyacrylamide. Such compositions can be used to enhance the strength of paper, particularly the wet strength of paper.