公开(公告)号：USRE46913E1

公开(公告)日：2018-06-26

申请号：US15477788

申请日：2017-04-03

Applicant: ARCHROMA IP GMBH

Inventor： Andrew Clive Jackson ,  David Puddiphatt ,  Cédric Klein

IPC: D21H21/30 ,  C07D251/68 ,  D21H17/66 ,  D21H17/63 ,  D21H21/16

CPC classification number: D21H17/63 ,  D21H17/66 ,  D21H21/16 ,  D21H21/30

Abstract: The instant invention relates to mixed salts of optical brighteners of formula (1), wherein M represents a mixture of Mg2+ with another cation, which provide for superior optical brightening effects when applied to the surface of paper.