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Expired
Application number
GB1285/54A
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Cassella Farbwerke Mainkur AG
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Cassella Farbwerke Mainkur AG
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Publication of GB756481ApublicationCriticalpatent/GB756481A/en
C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
C14C3/00—Tanning; Compositions for tanning
C14C3/02—Chemical tanning
C14C3/08—Chemical tanning by organic agents
C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
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Chemical & Material Sciences
(AREA)
Chemical Kinetics & Catalysis
(AREA)
General Chemical & Material Sciences
(AREA)
Organic Chemistry
(AREA)
Treatment And Processing Of Natural Fur Or Leather
(AREA)
Abstract
Water - soluble condensation products of methylol compounds of dicyandiamide and/or dicyandiamidine with a polyhydric alcohol are prepared in an acidic medium at below 50 DEG C. In examples, dicyandiamide and formaldehyde are heated together in water, cooled, and resorcinol, phloroglucinol, pyrocatechol, or its alkyl homologues added, followed by glacial acetic acid or ammonium chloride. The solutions may be used directly or concentrated and evaporated to form solid tanning agents for hides and skins.
GB1285/54A1953-01-191954-01-15Manufacture of water-soluble condensation products for tanning, and process of tanning using such products
ExpiredGB756481A
(en)
Condensation products from terphenyl-sulphonic acids, naphthalene-sulphonic acids, bis-(4-hydroxyphenyl)-sulphone and formaldehyde, and their use as tanning agents.
A procedure for obtaining mono-, di- or poly-hydroxy-alcohylxyantins and their nitric esters (Machine-translation by Google Translate, not legally binding)
Process for the production of high molecular weight, in neutral or weakly acidic water soluble, cationic urea-formaldehyde condensation products in solid form