PT95700A - Process for initial tanning of skins in the unprocessed state and for the retanning of tanned leather using chromium and the use of condensation products of melamine, dicyanodiamide, urea or thiourea with an aliphatic dialdehyde
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Process for initial tanning of skins in the unprocessed state and for the retanning of tanned leather using chromium and the use of condensation products of melamine, dicyanodiamide, urea or thiourea with an aliphatic dialdehyde
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Treatment And Processing Of Natural Fur Or Leather
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Abstract
Process in which use is made of a water-soluble condensation product formed from a) 1 mol of melamine, dicyanodiamide, urea or thiourea or of a mixture of these compounds; b) 0.5 to 12 mol of glyoxylic acid or of an aliphatic dialdehyde with up to 6 carbon atoms or of a mixture of these compounds; c) 0 to 3 mol of a condensable compound with at least one phenolic hydroxyl group or at least one alcoholic hydroxyl group; and d) 0 to 3 mol of a condensable compound with an amide or amine group; or the alkali metal salts or ammonium salts of these condensation products.
Claims (3)
REIVIiroiOACDlS; la. - Processo para o primeiro curtimento de peles em bruto e para o recurtimento de couro curtido ao crómio, caracterizado pelo facto de se empregar um produto de conden sação, solúvel em água, formado a partir de A) 1 mole de melamina, dicianodiamida, ureia ou tio-ureia ou duma mistura destes compostos; B) 0,5 a 12 moles de ácido glioxílico ou dum dialdeído alifá tico com até 6 átomos de carbono ou duma mistura destes compostos; 0) 0 a 5 moles dum composto condensável com pelo menos um gru po hidroxilo fenólico ou pelo menos um grupo hldroxilo alcoólico; e D) 0 a 5 moles dum composto condensável com um grupo de ami-da ou amino, ou os sais de metais alcalinos ou os sais de amónio destes produtos de condensação.REIVIiroiOACDlS; over there. A process for the first tanning of raw hides and retanning of chromium-tanned leather, characterized in that a water-soluble condensation product formed from A) 1 mol of melamine, dicyandiamide, urea or thiourea or a mixture of these compounds; B) 0.5 to 12 moles of glyoxylic acid or an aliphatic dialdehyde of up to 6 carbon atoms or a mixture of these compounds; 0) 0 to 5 moles of a condensable compound with at least one phenolic hydroxyl group or at least one alcoholic hydroxyl group; and D) 0 to 5 moles of a condensable compound having a amino or amino group, or the alkali metal salts or the ammonium salts of these condensation products.2§. - Processo para o primeiro curtimento de peles em bruto e para o recurtimento de couro curtido ao crómio, de acordo com a reivindicação 1, caracterizado pelo facto de se empregar um produto de condensação solúvel em água, que é formado a partir de ácido glioxílico, glioxal ou dialdeído glutárico, ou por uma mistura de ácido glioxílico e glioxal ou por ácido glioxílico e dialdeído glutárico como componente B. IP IP o 5^. - Processo para a preparação de produtos de densação solúveis em água, utilizados no processo de curtime to, de acordo com as reivindicações 1 e 2, caracterizado pel facto de se condensar: A) 1 mole de dicianodiamida, ureia ou tio-ureia ou duma mis-2§. A process for the first tanning of raw hides and retanning of tanned leather to chromium according to claim 1, characterized in that a water-soluble condensation product is formed which is formed from glyoxylic acid, glioxal, or glutaraldehyde, or by a mixture of glyoxylic acid and glyoxal or by glyoxylic acid and glutaric dialdehyde as component B. A process for the preparation of water-soluble dense products used in the curing process according to claims 1 and 2, characterized in that: A) 1 mole of dicyanodiamide, urea or thiourea or one mis-tura destes compostos uns com os outros ou com até uma quantl dade de 0,8 mole de melamina, com B) 0,5 a 12 moles do componente B$ 0) 0 a 5 moles do componente D, a uma temperatura compreendida no intervalo entre 20 e 100°G, em solução aquosa. Lisboa, 26/10/90 0 Agente Oficial da Propriedade Industrial /U_ orvalho Agente Ofinial da Propriedade Industrial R. Castilho, 201of these compounds with one another or up to a quantity of 0.8 mol of melamine, with B) 0.5 to 12 mol of component B) 0 to 5 mol of component D, at a temperature within the range between 20 and 100 ° C in aqueous solution. Lisbon, 10/26/90 0 Official Industrial Property Agent / U_devalho Official Industrial Property Agent R. Castilho, 201-3. E.-1000 LISBOA Telefs, 65 13 39 - 65 46 13-3. E.-1000 LISBOA Telefs, 65 13 39 - 65 46 13
PT9570090A1990-10-261990-10-26Process for initial tanning of skins in the unprocessed state and for the retanning of tanned leather using chromium and the use of condensation products of melamine, dicyanodiamide, urea or thiourea with an aliphatic dialdehyde
PT95700A
(en)
Process for initial tanning of skins in the unprocessed state and for the retanning of tanned leather using chromium and the use of condensation products of melamine, dicyanodiamide, urea or thiourea with an aliphatic dialdehyde
Process for initial tanning of skins in the unprocessed state and for the retanning of tanned leather using chromium and the use of condensation products of melamine, dicyanodiamide, urea or thiourea with an aliphatic dialdehyde
Process for initial tanning of skins in the unprocessed state and for the retanning of tanned leather using chromium and the use of condensation products of melamine, dicyanodiamide, urea or thiourea with an aliphatic dialdehyde
Process for initial tanning of skins in the unprocessed state and for the retanning of tanned leather using chromium and the use of condensation products of melamine, dicyanodiamide, urea or thiourea with an aliphatic dialdehyde