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Surface treatment of substrate or paper/paperboard products using optical brightening agent

  • US 7,622,022 B2
  • Filed: 06/01/2006
  • Issued: 11/24/2009
  • Est. Priority Date: 06/01/2006
  • Status: Active Grant
First Claim
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1. A process for applying optical brightening agent to a surface sized paper or paperboard substrate, the process comprising:

  • spraying an aqueous composition comprising an optical brightening agent (OBA) onto at least one surface of the sized paper or paperboard substrate having a surface TAPPI brightness of (x) to form a treated sized paper or paperboard substrate having a layer of OBA on the at least one surface of the sized paper or paperboard substrate having a surface TAPPI brightness of (y), wherein (y) is greater than (x) and wherein the spraying of the aqueous composition conducted right after the size press and prior to dryer devices within a papermaking machine process.

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