US2015119600A1PendingUtilityA1

Novel Optical Brightening Agent Used for the Papermaking Process

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Assignee: Li meng junPriority: Oct 24, 2013Filed: Oct 24, 2013Published: Apr 30, 2015
Est. expiryOct 24, 2033(~7.2 yrs left)· nominal 20-yr term from priority
Inventors:Meng LiEric Li
D21H 21/30D21H 17/09
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Claims

Abstract

A new optical brightening agent 351 (OBA 351) 4,4″-Bis(2-sulfostyryl)biphenyl disodium salt (CAS 27344-41-8) is used on the wet-end papermaking process and coating papermaking process to increase the brightness of paper. The new OBA 351, when compared to the conventional OBA, is able to Obtain an additional 16 ISO brightness of performance.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A new optical brightening agent (OBA) used on the wet-end papermaking process for increasing the brightness of the paper, wherein the concentration is 0.01%-.1.0% OBA by weight based on the paper. 
     
     
         2 . A new optical brightening agent (OBA) used on the coating papermaking process for increasing the brightness of the coated paper, wherein the concentration is 0.01%-1.0% OBA by weight based on the paper. 
     
     
         3 . A new optical brightening agent (OBA) as claimed in  claim 1  is 4,4″-Bis(2-sulfostyryl)biphenyl, disodium salt (CAS 27344-41-8). 
     
     
         4 . A new optical brightening agent (OBA) as claimed in  claim 2  is 4,4″-Bis(2-sulfostyryl)biphenyl, disodium salt (CAS 27344-41-8).

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