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US 4,059,580 AGranted
Sulphonated polybenz-1,3-oxazin-2,4-diones
AssigneeBayer Aktiengesellschaft
InventorsKlaus Elfert, Jurgen Hinz, Rudolf Binsack
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Abstract
Novel, sulphonated polybenz-1,3-oxazin-2,4-diones are produced by reacting polybenzoxazin diones with chlorosulphonic acid in a molar ratio of from 1:1 to 1:10.
Claims4
A sulphonated polybenz-1,3-oxazin-2,4-dione whose 0.5% solution in dimethyl formamide at 25.degree. C has a relative viscosity of from 0.7 to 3.5 and which has an acid number of from 1 to 800 of the formula ##STR7## wherein R is ##STR8## and Ar is of the formula ##STR9## wherein X is a bond, --O--, --S--, --SO.sub.2 --, --C(CH.sub.3).sub.2 -- or --CH.sub.2 --;
- Y is a bond, --O--, --S--, --CH.sub.2 --, --SO.sub.2 -- or --CO--;
- Z is --SO.sub.3 H or a radical of a sulphonic acid salt of an alkali or alkaline earth metal;
- m, n, o, p, q, r and s are the same or different, and m and n represent 0 or an integer from 1 to 4, o, p and q represent 0, 1 or 2, and r and s represent 0 or an integer from 1 to 3;
- with the proviso that m, n, o, p, q, r and s cannot all be 0 simultaneously;
- and x is an integer of from 10 to 200.
2 more elements
Dependencies are inferred from the claim text.