Rutgerswerke Aktiengesellschaft

Bakelite Ag

Willi Roll

Achim Hansen

Antonio Pizzi

Ken Kurple

Arno Gardziella

Axel Bottcher

Peter Stracke

Peter Fricke

Walter Napp

Arno Gardzielia

Berthold Dombo

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.

Method for producing resols

The bonding agent composition comprises tannin of pine bark and/or pecan nut, paraformaldehyde and an ammonium salt of a weak acid. It serves inter alia as bonding agent for particle board with high transverse tensile strength, good water resistance and low formaldehyde emission.

Bonding agent composition, its use as well as a process for the

A heat-curable, formaldehyde-free binding agent comprising a polyflavonoid type tannin and as a curing catalyst, a compound having a weak acid reaction curable at relatively high temperatures and compatible with cellulose containing materials such as wood chips for the production of particle boards.

Heat-curable tannin-based binding agents

A binder mixture containing lignin or lignins with reactive groups and phenol-novolac in a weight ratio of 95:5 to 50:50 useful for the production of non-woven fabrics and wood fiber materials.

Binder mixtures containing reactive group containing lignin and novolaks

Binder mixtures containing lignin and phenol novolaks

Growing community of inventors

Altenberge, Germany

Willi Roll