Rutgerswerke Aktiengesellschaft

Peter Staglich

Robert Zellerhoff

Herbert Beneke

Rudolf Oberkobusch

Hans Spengler

Wilhelm Holtmann

Bodo Friedrich

Wolfgang Lucke

Bernhard Charpey

A process for the preparation of an aromatic hydrocarbon resin modified with aromatic carboxylic acids comprising suspending methane sulfonic acid and at least one aromatic carboxylic acid in an aliphatic solvent and slowly proportioning at least one unsaturated aromatic hydrocarbon into the suspension under polymerization conditions and their salts.

Novel process

In a process for selective crystallization of 2,6-dialkyl-naphthalene selected from the group consisting of methyl-n-propyl-naphthalene, methyl isopropyl-naphthalene, ethyl-isopropyl-napthalene, ethyl-n-butyl-naphthalene, di-n-propyl-naphthalene, diisopropyl-naphthalene, methyl-amyl-naphthalene, ethyl-amyl-naphthalene, propyl-amyl-naphthalene, di-n-butyl-naphthalene and diisobutyl-naphthalene from their isomer mixtures from a polar solvent solution, the improvement comprising effecting the crystallization with constant stirring at a temperature from 25.degree. to -30.degree. C. to obtain the 2,6-dialkyl-naphthalene at least 95% pure.

Recovery of 2,6-dialkyl-naphthalene isomers

Stable phenolic-modified hydrocarbon resins with an OH number which is 4.5 or greater are resonably priced and toxicologically generally regarded as safe resins for the development of leucopigments, especially for the development of colors in pressure sensitive recording materials. The softening point may be varied by copolymerization with multivalent phenolic compounds and vinyl phenol within the range of 70.degree.-90.degree. C.

Stable, phenolic modified hydrocarbon resins for leucopigments

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Kempen, Germany

Peter Staglich