Patent · US Expired

Lignin modified binding agents

US5300593A · kind A · utility

6Cited by

10References

8Claims

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	Aug 17, 1993
Grant date	Apr 5, 1994
Priority date	—
Expiry date	Aug 17, 2013

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.