Process for the preparation of tanning resins

Tanning resins are produced by condensing in a single stage reaction 0,4 to 0,65 mole of an aminotriazine, 0,35 to 0,60 mole of dicyandiamide and 2,5 to 4,5 mole of an aldehyde, adding before, during or after the condensation 0,2 to 0,4 mole of an alkali metal salt of an aromatic sulphonic acid and...

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Bibliographische Detailangaben
Hauptverfasser:	PLAPPER JURGEN, HEYDEN RUDI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING,IMPREGNATING, FINISHING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS FOR TANNING HIDES LEATHER MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PELTS SKINS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	Tanning resins are produced by condensing in a single stage reaction 0,4 to 0,65 mole of an aminotriazine, 0,35 to 0,60 mole of dicyandiamide and 2,5 to 4,5 mole of an aldehyde, adding before, during or after the condensation 0,2 to 0,4 mole of an alkali metal salt of an aromatic sulphonic acid and drying the product. Other aminoplast-forming substances such as urea or cyanamide may be used in addition to or as a partial replacement of the melamine and/or dicyandiamide. Aminotriazines specified are melamine, the alkylmelamines, the alkylolmelamines, melam, melem, melon, ammelide and ammeline. Aromatic sulphonic acids specified include benzene-sulphonic acids, phenolsulphonic acids, naphthalene sulphonic acids, sulphonated phenol-formaldehyde condensates, sulphonated dihydroxydiphenylmethane, sulphonated dihydroxydiphenylpropane sulphonated dihydroxy diphenylsulphone, dinaphthylmethanedisulphonic acid and naphtholsulphonic acids.