Patent · US Expired

Binder

US4357454A · kind A · utility

9Cited by

4References

7Claims

0Family size

Assignee

Eka AB · SE

Inventors

Krister Holmberg · Mölndal, SE
Jan-Allan Y. Johansson · Gothenburg, SE
Gerd E. Wallin · Gothenburg, SE

Key dates

Filing date	Aug 20, 1981
Grant date	Nov 2, 1982
Priority date	—
Expiry date	Aug 20, 2001

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L97/005
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A lignin product-containing binder and a process for its production are described. The lignin product consists of chlorolignin which has been treated with strong alkali (NaOH) for preferably 0.5-3 h. at 50.degree.-100.degree. C. and a pH of 10-13.5. The alkali-treated chlorolignin product can be used on its own as a binder component or, preferably, together with phenol-formaldehyde. The weight ratio phenol/lignin product is suitably from 4:1 to 1:4.

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