Preparation of condensates of arenesulfonic acids and formaldehy

Details Preparation of condensates of arenesulfonic acids and formaldehy Preparation of condensates of arenesulfonic acids and formaldehy

1993-03-26

1996-07-09

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Polymeric additive

8558, 8 58D, 8589, 8594, 252310, B01F 1752, C09B 6742, C08G 1602

Patent

active

055341667

ABSTRACT:
Condensates of arenesulfonic acids and formaldehyde are prepared by sulfonating arenes obtainable by thermal cracking of a naphthenic residue oil and fractional distillation of the cracked products of the fraction obtained at 100-120.degree. C. under atmospheric pressure, sulfonating this aromatics fraction with oleum at 120.degree.-160.degree. C. using an amount of from 0.7 to 1.2 parts by weight of oleum having an SO.sub.3 content of 24% by weight per part by weight of aromatics fraction, and subsequently condensing the arenesulfonic acids with formaldehyde in a conventional manner, and are used as dispersants, in particular for preparing dye formulations.

REFERENCES:
patent: 3954677 (1976-05-01), Law
patent: 4214872 (1980-07-01), Uhrig et al.
patent: 4245996 (1981-01-01), Schade et al.
patent: 4247293 (1981-01-01), Wurmli

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