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. 13, 2001
Filed:
Apr. 02, 1998
Applicant:
Inventors:
Hannu Ketola, Hämeenlinna, FI;
Tuija Andersson, Turku, FI;
Asko Karppi, Turku, FI;
Sauli Laakso, Masku, FI;
Antti Likitalo, Turku, FI;
Assignee:
Raisio Chemicals Oy, Raisio, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 1/100 ;
U.S. Cl.
CPC ...
D21H 1/100 ;
Abstract
A method for internal sizing of paper using cationic starch is provided. The starch used is cationized with a mixture of epichlorhydrin, trimethylamine, and mono-or dimethylamine or N,N,N′,N′-tetramethylethylenediamine. Cationizing results in a higher molecular size of the starch, which has e.g. a beneficial effect on dewatering on the paper machine forming wire.