Enhancing brightness and brightness stability of paper...

Details Enhancing brightness and brightness stability of paper... Enhancing brightness and brightness stability of paper...

D - Textiles, Paper

21

H

D21H 17/05 (2006.01) D21H 21/14 (2006.01) D21H 11/08 (2006.01)

Patent

CA 2474713

Methods to enhance the brightness and brightness stability of paper and paperboard made with Mechanical Pulp are described and claimed. The method involves applying a Penetrant Compound to paper or paperboard in an amount from about 0.001 percent to about 1 percent by weight. The Penetrant Compound can have one component that is either polyamino polyether methylene phosphonate (PAPEMP) and .alpha.-glucoheptonic-.gamma.-lactone (GL); or the Penetrant Compound can have two components, where the first component is selected from the group consisting of PAPEMP and GL and the second component is an inorganic salt; or the Penetrant Compound can have three components where one component is selected from the group consisting of PAPEMP and GL, the second component is selected from the group consisting of 3,5- dimethylperhydrothiadiazine-2-thion and dialkyldithiocarbamates and the third component is an inorganic salt.

Sont décrits et revendiqués des procédés pour améliorer la blancheur ainsi que la stabilité de blancheur de papier et de carton produits avec de la pâte mécanique. Le procédé consiste à appliquer un composé pénétrant au papier ou au carton en une quantité allant d'environ 0,001 pourcent à environ 1 pourcent en poids. Le composé pénétrant peut avoir un constituant qui est soit polyamino polyéther méthylène phosphonate (PAPEMP) soit .gamma.-lactone-.alpha.-glucoheptonique (GL); soit le composé pénétrant peut avoir deux constituants, le premier constituant est choisi dans le groupe comprenant PAPEMP et GL et le second constituant est un sel inorganique; ou le composé pénétrant peut avoir trois constituants, un constituant est sélectionné dans le groupe comprenant PAPEMP et GL, le second constituant est choisi dans le groupe comprenant 3,5-diméthylperhydrothiadiazine-2-thion et des dialkyldithiocarbamates et le troisième constituant est un sel inorganique.

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