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US 4,009,996 AGranted
Reaction products of phenolsulphonic acid-urea-formaldehyde as tanning agents and process for their manufacture
AssigneeCiba-Geigy Corporation
InventorAlbert Wurmli
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Abstract
The invention relates to reaction products of phenolsulphonic acid-urea-formaldehyde as agents for tanning of skins or leather. They are manufactured from a hydroxyphenylsulphone-hydroxyphenyl-monosulphonic acid which is condensed with an alkoxybenzene, this condensation product being reacted at elevated temperature in an aqueous-acid medium with an urea formaldehyde mixture or with a methylolated urea.
Claims13
Reaction product of phenolsulphonic acid-urea-formaldehyde from
- A 100 parts by weight of a condensation product from
- a. 1 mole of a hydroxyphenylsulphone-hydroxyphenylmonosulphonic acid having 1 to 4 hydroxyphenylsulphone groups per molecule, and
- b. 0.1 to 0.6 mole of an alkoxybenzene having 1 to 4 carbon atoms in the alkoxy radical, and
- B 10 to 40 parts by weight of a reaction product or of a mixture of
- c. 1 mole of urea and/or of a urea derivative and
- d. 1 to 4 moles of formaldehyde or of an agent releasing formaldehyde.
3 more elements
Dependencies are inferred from the claim text.