Surface treatment of substrate or paper/paperboard products...

Paper making and fiber liberation – Processes and products – Non-fiber additive

Reexamination Certificate

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Details

C162S135000, C162S175000, C162S202000, C252S301210, C510S394000, C008S648000

Reexamination Certificate

active

07622022

ABSTRACT:
The present invention relates to a process for applying optical brightening agent (OBA) to a sheet of paper or paperboard substrate. The process comprises the step of spraying an aqueous composition comprising an optical brightening agent onto at least one surface of a sized paperboard substrate to form a treated paperboard substrate. The treated paperboard substrate includes a layer of OBA on at least one surface of the paper or paperboard substrate in which the brightness of the treated paper or paperboard substrate is greater than the sized paper or paperboard substrate before treating thereof.

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