Method for sizing paper
AssigneeRaisio Chemicals Oy
InventorsHannu Ketola, Tuija Andersson, Asko Karppi, Sauli Laakso, Antti Likitalo
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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.
Claims12
Method for paper manufacture on a paper machine having a wet-end, which comprises adding starch to a fibre stock in the wet-end, wherein said starch is a starch cationized with a chemical produced by using epichlorhydrin and trimethylamine, and in addition at least one of the members selected from the group consisting of monomethylamine, dimethylaminie and N,N,N′,N′-tetramethylethylenediamine.
Dependencies are inferred from the claim text.