Patent · US Expired

Method for producing resols

US6410776B1 · kind B1 · utility

12Cited by

5References

10Claims

0Family size

Assignee

BAKELITE GMBH · DE

Inventors

Willi Roll · Havixbeck, DE
Axel Bottcher · Wesel, DE
Walter Napp · Duisburg, DE
Peter Fricke · Kevelaer, DE

Key dates

Filing date	Oct 4, 2000
Grant date	Jun 25, 2002
Priority date	—
Expiry date	Oct 4, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G8/10
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a process for the preparation of resols by reacting phenolic compounds with aldehydes with catalysis by metal salts whose cation can easily be precipitated as low-solubility salts in industrial processes. In this process, a dispersant is added to the reaction mixture comprising phenolic compound, aldehyde and metal salt before, during or after the condensation reaction, and a complexing agent is admixed after the condensation reaction is complete and after the dispersant has been admixed. The resultant resins are transparent even after neutralization using sulphuric acid.

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