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:
Nov. 05, 1996
Filed:
Jan. 08, 1992
Applicant:
Inventor:
Thomas C Fallon, West Chicago, IL (US);
Assignee:
Nalco Chemical Company, Naperville, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
D21H / ;
U.S. Cl.
CPC ...
1621682 ; 1621683 ; 162183 ;
Abstract
A process in which paper or paperboard is made by forming an aqueous cellulosic slurry, draining said slurry on a screen to form a sheet and drying said sheet, employs a cationic polymer as a substantially single component retention aid. The cationic polymer has a cationic charge density of at least about 3.2 equivalents of cationic nitrogen per kilogram of dry polymer. The cationic polymer also has an Intrinsic Viscosity of at least about 8 dl/g. The polymer is added to the slurry prior to sheet formation in an amount effective to provide at least about a 50 percent increase in retention without more than about a 10 percent decrease in formation.