Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2004-08-17
2009-02-10
Hug, Eric (Department: 1791)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S158000, C162S164300, C162S166000, C525S328300, C525S329400, C525S383000
Reexamination Certificate
active
07488403
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.
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Favors Karla D.
Hagiopol Cornel
Johnston James W.
Luo Yuping
Ringold Clay E.
Cordray Dennis
Hug Eric
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