Patent · US Active

Process for preparing low air entraining, low viscosity lignosulfonates

US11427508B2 · kind B2 · utility

0Cited by

5References

10Claims

0Family size

Assignee

Borregaard AS · NO

Inventors

Martin Andresen · Sarpsborg, NO
Guro Elise Fredheim · Sarpsborg, NO
Jerry D. Gargulak · Ringle, US
David L. Oldroyd · Toronto, CA
Hans Petter Pettersen · Sarpsborg, NO
Anders Sjöde · Sarpsborg, NO
Vibeke Bogetvedt Spernes · Sarpsborg, NO
Bjørn Jensen · Bud, NO

Key dates

Filing date	Apr 14, 2017
Grant date	Aug 30, 2022
Priority date	—
Expiry date	Apr 27, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07G1/00
WIPO fieldBiotechnology
WIPO sectorChemistry

Abstract

A method for preparing a low-air entraining, low viscosity lignosulfonate composition. The method comprises: a) applying heat to the crude lignosulfonate composition under suitable conditions to reduce sugar levels to below 10%, optionally below 5%, optionally below 3%), or optionally below 1%, on a dry basis; b) mixing a crude lignosulfonate composition with an effective amount of a source of trivalent ion to complex air entraining fatty acids and resin acids; c) lowering temperature to prevent viscosity buildup.

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