Process for the preparation of naphthalenesulfonic acid/formalde

Details Process for the preparation of naphthalenesulfonic acid/formalde Process for the preparation of naphthalenesulfonic acid/formalde

1991-11-01

1993-04-27

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

524 3, C08G 1220, C08G 1224, C08G 1602, C08G 7500

Patent

active

052063364

ABSTRACT:
Process for the preparation of naphthalenesulfonic acid/formaldehyde condensates having a low content of free formaldehyde, in which the condensation products of naphthalenesulfonic acid and formaldehyde obtained after the condensation, are brought to a pH of greater than 11.5 at a temperature of not less than 80.degree. C. immediately after the condensation, and are kept under these conditions until the desired formaldehyde content is reached. The resins are preferably used as plasticizers for building materials, for example as concrete plasticizers.

REFERENCES:
patent: 4256871 (1981-03-01), Papalos et al.
patent: 4725665 (1988-02-01), Pieh et al.
patent: 5101007 (1992-03-01), Jager et al.

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