Patent · US Expired

Lignin modified binding agents

US5260405A · kind A · utility

11Cited by

10References

3Claims

0Family size

Assignee

Rutgerswerke Aktiengesellschaft · DE

Inventors

Arno Gardziella · Witten, DE
Achim Hansen · Zug, CH
Stephan Schröter · Essen, DE
Josef Suren · Haaren, DE

Key dates

Filing date	Oct 26, 1992
Grant date	Nov 9, 1993
Priority date	—
Expiry date	Oct 26, 2012

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16D69/025
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A binding agent for molding compositions and molded bodies produced by reacting a low molecular weight lignin from the Organosolv process with phenol in a weight ratio of 1:20 to 3:1 at 100.degree. to 180.degree. C., adjusting the pH to an acidic value and condensing the mixture with 0.2 to 0.9 moles of formaldehyde per mole of phenol at 60.degree. to 120.degree. C. to form the binding agent useful for producing curable molding compositions, high-temperature molding compositions, refractory products, textile fleeces and friction coatings as well as carbon materials.

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