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. 26, 1996
Filed:
Jun. 06, 1995
Charles L Burdick, Ladenberg, PA (US);
Elliott Echt, Wilmington, DE (US);
Hercules Incorporated, Wilmington, DE (US);
Abstract
A method is provided for using an aqueous suspension of at least 15% of poly(ethylene oxide) (PEO) as a retention aid in the manufacturing of paper. PEO is dispersed in an aqueous solution of at least one salt selected from the group consisting of sodium or potassium formate, sodium or potassium hydroxide, sodium or potassium citrate, sodium or potassium acetate, sodium chloride or mixtures thereof to form a poly(ethylene oxide) suspension having at least 15% of poly(ethylene oxide) by total weigh. This suspension is dissolved in said dispersion in an aqueous system containing ferric ions or free chlorine; and said dissolved aqueous system is added to a pulp slurry for making paper just prior to forming the pulp into a wet web, whereby said aqueous suspension prevents the loss of fiber fines during the paper formation stage and resists viscosity loss due to ferric ions or free chlorine in the aqueous system.