Patent · US Expired

Process of and composition for de-inking waste paper as well as paper reclaimed by said process

US4487655A · kind A · utility

12Cited by

5References

4Claims

0Family size

Assignee

Benckiser-Knapsack GmbH · DE

Inventors

Siegfried N/o/ etzel · Wilhelmsfeld, DE
Margarete Scholl · Mannheim, DE
Heinz Ballreich · Neulußheim, DE

Key dates

Filing date	Apr 6, 1984
Grant date	Dec 11, 1984
Priority date	—
Expiry date	Apr 6, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/64
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The novel, advantageous, and economical process of reclaiming printed waste paper comprises subjecting waste paper to a flotation de-inking process. The degree of whiteness of the reclaimed paper is considerably increased by the addition of specific phosphonic acid compounds to the de-inking bath. Hydroxy carboxylic acids, amino carboxylic acids, polycarboxylic acids as well as magnesium sulfate may also be added to the de-inking bath containing the phosphonic acids.

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