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US 4,902,298 AGranted
Tanning composition and its use in the tanning and post-tanning of animal hides
AssigneeProdeco, Inc.
InventorsMauro D'Elia, Angelo Romano
Life of this patent
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Abstract
A tanning composition containing: (a) aluminum chlorohydroxide (b) the product of condensation of dicyandiamide and formaldehyde; (c) basic chrome sulphate; and (d) polyacrylic acid, polymethacrylic acid or a copolymer of acrylic acid and methacrylic acid; makes it possible, in the tanning treatments, of stably fixing high chrome levels in the animal hides, and of exhausting, to a substantially complete extent, the chrome contained in the tanning bath.
Claims9
Tanning composition containing:
- (a) from 25 to 40% by weight of an aluminum chlorohydroxide, definable by means of the general formula:
- Al.sub.2 (OH).sub.1.5-3.0 Cl.sub.4.5-3.0
- (b) from 5 to 20% by weight of the product of condensation of dicyandiamide and formaldehyde, containing free methylol groups;
- (c) from 35 to 55% by weight of basic chrome sulphate, expressed as an aqueous solution at 12% by weight of chrome oxide (Cr.sub.2 O.sub.3);
- and
- (d) from 5 to 15% by weight of polyacrylic acid, polymethacrylic acid or a copolymer of acrylic and methacrylic acid with a molecular weight comprised within the range of from 1,000 to 100,000.
3 more elements
Dependencies are inferred from the claim text.