Aromatic isocyanato-polysulphonic acids

Details Aromatic isocyanato-polysulphonic acids Aromatic isocyanato-polysulphonic acids

1977-03-30

1978-10-10

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 292TN, 260239A, 260453AB, 260453AM, 260508, 544219, 560 12, 560 13, 528 44, C07C119048, C07D22900

Patent

active

041196589

ABSTRACT:
The present invention relates to isocyanato-polysulphonic acids comprising from 1 to 3 aromatically bound isocyanate groups which may be present at least partly in the dimerized form as uretdione groups and from 2 to 6 sulphonic acid groups for each non-dimerized isocyanato-polysulphonic acid or for each monomeric isocyanato-polysulphonic acid on which the dimer is based. These acids are produced by reacting mono- or poly-isocyanates having exclusively aromatically bound isocyanate groups with sulphur trioxide at -10.degree. C to 140.degree. C, wherein the isocyanate used as starting material which is to be sulphonated is reacted with at least 50% by weight of sulphur trioxide, based on the quantity of isocyanate used as starting material. Alternatively they may be produced using isocyanate-monosulphonic acids which have exclusively aromatically bound isocyanate-groups.

REFERENCES:
patent: 3826769 (1974-07-01), Carlson
patent: 3959329 (1976-05-01), Dieterich
patent: 3998870 (1976-12-01), Carlson

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