公开(公告)号：US3900608A

公开(公告)日：1975-08-19

申请号：US29929772

申请日：1972-10-20

Applicant: BAYER AG

Inventor： DIERKES HUBERT ,  SCHONOL KARL ,  WALTER JOACHIM ,  MULLER FRIEDHELM

IPC: C09B67/42 ,  D06L3/12 ,  C09K3/00

CPC classification number: C09B67/0071 ,  D06L4/636 ,  D06L4/664

Abstract: Preparations of optical brighteners, for the whitening of fiber materials and coating mixtures for paper, which contain the solution of a dispersion brightener (a) in such a colourless organic liquid (b) which is immiscible with water, the boiling point of which is above 150*C and in which the brightener exhibits a minimum solubility of 0.3 g per litre at room temperature, with the solution optionally also containing an emulsifier (c); furthermore a process for the whitening of fiber materials and coating mixtures for paper wherein said solutions are applied.