Processing aid for paper making

Details Processing aid for paper making Processing aid for paper making

D - Textiles, Paper

21

H

D21H 21/14 (2006.01) D21H 17/00 (2006.01) D21H 17/07 (2006.01) D21H 17/56 (2006.01) D21H 17/72 (1990.01)

Patent

CA 2121059

Aqueous compositions and process aids useful in paper processing for quenching optical brighteners, particularly under alkaline paper production conditions. The process aids are aqueous compositions comprising (a) an acid addition salt or quartenization product of a cyclic amidine, (b) a polyethyleneimine and optionally (c) an acid. The aqueous compositions and process aids may be added to paper feedstocks in paper production apparatus or to paper production apparatus absent a paper feedstock.

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