Patent · US Expired

Bleaching paper pulp with modified silicate ion exchanger and hydrogen peroxide

US5039377A · kind A · utility

9Cited by

3References

9Claims

0Family size

Assignee

Sud Chemie, Inc. · US

Inventors

Axel von Raven · Gilching, DE
Josef Weigl · Birkenfeld, DE
Friedrich Ruf · Ramstein-Miesenbach, DE
Herbert E. Mayer · Abensberg, DE

Key dates

Filing date	May 23, 1990
Grant date	Aug 13, 1991
Priority date	—
Expiry date	May 23, 2010

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21C9/163
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method for bleaching pulp using an alkaline, peroxide-containing bleaching agent for chemical pulp, mechanical pulp, waste paper and/or mixtures thereof, which optionally contains water glass and/or a complexing agent, contains, as an additive, a silicate ion exchanger which has been modified using an alkali metal carbonate or alkali metal hydrogen carbonate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.