Process for controlling the brightness of paper products
OwnerAlec Tindalinventor
Life of this patent
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Abstract
A process for shading white paper characterized in that a mixture comprising at least one direct dye or pigment and at least one optical brightener is used, is claimed as well as the mixture and the paper dyed with this method.
Claims8
A process for shading white paper by using a mixture comprising at least one direct dye or pigment and at least one optical brightener characterised in that the mixture consists of one or more direct dyes and one or more optical brighteners in a ratio of 25/75 to 90/10 percent by weight, preferably 50/50 percent by weight.
Mixture for adding fluorescence to shading dyes for paper comprising one or more direct dyes and one or more optical brighteners in a ratio of 25/75 to 90/10 percent per weight.
Mixture for adding fluorescence to shading dyes for paper comprising one or more pigments and one or more optical brighteners in a ratio of 25/75 to 90/10 percent per weight.
Dependencies are inferred from the claim text.