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| Number | Title | Issue Date |
| 7771489 | Formulation for use in chrome or chrome-free tannage A formulation for use in chrome-free or chrome tanning is proposed, comprising a clay mineral which, after vigorous stirring for 30 minutes in water at 50° C., has a number average particle diameter of less than 2 μm or a bimodal size distribution with a first, fi... | 08/10/2010 |
| 7354457 | Tanning agent and curing agent based on dialdehydes Tanning agents can be prepared by reacting at least one aldehyde of formula I, with at least one further identical or different aldehyde of formula I, where Z is a single chemical bond, unsubstitute... | 04/08/2008 |
| 7282066 | Processes for preparing and using tanning agents and preservatives A process for the preparation of aqueous formulations, and aqueous formulations so prepared, the process comprising heating at least one cyclic compound of the formula I in the presence of water and of an acidic ... | 10/16/2007 |
| 6685746 | Impregnation of leather with micro-encapsulated material A material is impregnated into leather by incorporating the material into micro-capsules and then applying said micro-capsules to said leather material by means of a suitable process. A roller coating process is described in which the material is applied ... | 02/03/2004 |
| 6652597 | N-vinyl-containing polymeric tanning materials N-Vinyl-containing polymers obtainable by free-radically initiated polymerization of a monomer or monomer mixture of (A) from 5 to 100% by weight of an N-vinylamide or N-vinylamine, (B) from 0 to 95% by weight of monoethylenically unsaturated carboxylic ... | 11/25/2003 |
| 6540790 | Tanning leather Leather is tanned by cross-linking collagen with tris(hydroxymethyl)phosphine or a condensate of a tetrakis(hydroxymethyl)phosphonium salt with an amide or amine in a main tannage or retannage.... | 04/01/2003 |
| 6395040 | Process for producing leather A method for producing leather generally including the steps of: (a) providing wet blue, full grain skins, (b) applying a liquid chrome solution to the skins while at a pH of 3.5 or lower, (c) raising the pH level of the skins to at least approximately 6.... | 05/28/2002 |
| 6387135 | Treatment of hides A process and apparatus for the treatment of hides and skins (3). The hide or skin is placed on a support (1, 2) and sealed to the support around the edges of the skin or hide. A treatment liquor is then supplied under pressure between the skin or hide an... | 05/14/2002 |
| 6322717 | Method of processing leather material, leather material thus processed and leather product using leather material thus process A processing method of a leather material having grains thereon is disclosed. The processing method of the leather material includes: the first step of sammying a tanned leather material by hand; the second step of moistening the leather material; and thi... | 11/27/2001 |
| 6254644 | Biologically degradable leather The present invention relates to a process for preparing leather by (I) tanning a pelt with (a) an aldehyde, or (b) a bisulphite-blocked polyisocyanate; (II) optionally, retanning the pelt with (a) a polyaspartic acid, a salt of a polyaspartic acid, a polyaspartic acid ... | 07/03/2001 |
| 6179879 | Leather impregnated with temperature stabilizing material and method for producing such leather The present invention is directed towards a tanned leather product that is impregnated with a plurality of microspheres containing a temperature stabilizing material. The present invention is also directed to a tanning process for embedding the microspher... | 01/30/2001 |
| 6033590 | Compositions for the preparation of leather Compositions for the simultaneous retanning and fatliquoring of leather are described which may include further leather treatment agents as well.... | 03/07/2000 |
| 5948123 | Coloring method for hides A coloring method, wherein coloring agent or pigment is injected into active cells of an animal hide before the hide is harvested, and a coloring agent injection device with one or more needles, which are injected into the active cells of the hide of an a... | 09/07/1999 |
| 5900027 | Process for preparing animal hides or pelts In order to make processes for finishing animal hides or pelts less labor-intensive and more environmentally compatible, a process is proposed in which, following a conventionally conducted soak, the animal hides or pelts are treated with a conventional t... | 05/04/1999 |
| 5885302 | Leather tanning process The present invention refers to a new process meant for chrome and/or vegetable leather tanning. The process proposed by the invention comprises the steps of bating or purging, conditioning, and chrome and/or vegetable tannage. The conditioning step uses ... | 03/23/1999 |
| 5873908 | Alkoxy group containing copolymers and their use in retanning leather The present invention relates to alkoxy-groups-containing copolymers of a) 1 to 99%-wt. water soluble ethylenically unsaturated, acid-groups-containing monomers, b) 1 to 50%-wt. monomers having a polyalkoxy sequence and c) 0 to 60%-wt. water soluble monom... | 02/23/1999 |
| 5868798 | Treatment of hides A process and apparatus for treating animal skins or hides (10) comprises stretching the hide to extend it and to open the structures and mounting the hide in a frame (15) by ties (12) extending between the hide edge attachments (11) and the frame. The hi... | 02/09/1999 |
| 5728313 | Leather oiling compositions and their use A method for oiling leather and skins by impregnating the leather and skins with partial esters of cyclic polycarboxylic acids or (partial) anhydrides with monofunctional fatty alcohols and optionally fixing the partial esters in the leather. Aqueous disp... | 03/17/1998 |
| 5714560 | Water-soluble or water-dispersible graft polymers of proteins as leather tanning agents Water-soluble or water-dispersible graft polymers which are obtainable by free-radical-initiated polymerization of (A) a monomer or monomer mixture comprising (a) from 20 to 100% by weight of acrylic acid or methacrylic acid or a mixture thereof or alkali meta... | 02/03/1998 |
| 5693631 | Potentiation of the microbicide 2-(thiocyanomethylthio) benzothiazole using an N-alkyl heterocyclic compound Microbicidal compositions are described. The compositions comprise (a) 2-(Thiocyanomethylthio)benzothiazole (TCMTB) and (b) an N-alkyl heterocyclic compound of the formula: ##STR1## The variable "n" ranges from 5 to 17, and the heterocyclic ring defi... | 12/02/1997 |
| 5686011 | Process for waterproofing materials having a fibrous structure and agents used to carry out this process A process is disclosed for waterproofing materials having a fibrous structure, such as leather, persian leather or leather replacement materials, by using waterproofing agents containing sulfosuccinic acid esters. Also disclosed are waterproofing agents u... | 11/11/1997 |
| 5660759 | Cationic formulations for oiling leathers and skins The process of oiling leathers and furs by contacting the leathers and furs with an oiling composition containing esterquats corresponding to formula (I): ##STR1## in which R1 CO is an acyl radical containing 6 to 22 carbon atoms, R | 08/26/1997 |
| 5571443 | Synergistic combination of 2-(thiocyanomethylthio)benzothiazole and thiophanate compounds useful as fungicides A method for preventing the deterioration of leather by controlling the growth of fungus, wherein the leather is contacted with TCMTB and a thiophanate compound present in a combined amount synergistically effective to control the growth of at least one f... | 11/05/1996 |
| 5489389 | New leather oiling preparations and their use An aqueous dispersion of amphiphilic oligomers for oiling leather or skins wherein the dispersion contains anionically modified urethane fatty oligomers containing long-chain hydrocarbon fatty groups containing from 8 to 40 carbon atoms, together with sal... | 02/06/1996 |
| 5368608 | Calcification-resistant materials and methods of making same through use of multivalent cations Bioprosthetic materials, either natural or synthetic, are treated with trivalent aluminum or iron cations, or salts, to prevent in vivo calcification. Such bioprosthetic materials include porcine aortic valve leaflets, bovine pericardium, aortic homograft... | 11/29/1994 |
| 5300121 | Process for the treatment of wool skins A method of tanning an animal skin with wool or hair attached thereto wherein the animal skin is pickled in an acidic solution and thereafter tanned in a solution containing at least one tanning agent characterised in that the animal skin is picked and ta... | 04/05/1994 |
| 5274078 | Process for producing collagen powder A collagen powder is obtained by wet-pulverizing a purified animal tissue consisting mainly of collagen in water at a collagen concentration of 1-30% by weight at a water temperature of not more than 37° C. and a pH value of 2-8, tanning treating the pul... | 12/28/1993 |
| 5269814 | Method of producing a split leather, especially for automotive applications subject to temperature and humidity fluctuations Between a chrome tanning step and a fat liquor treatment step, a flesh side split leather is subjected to shaving on both its split and flesh sides to a thickness of 1.1 to 2.5 mm, preferably 1.2 to 1.5 mm and is then aftertanned. After a split side dress... | 12/14/1993 |
| 5264000 | Aqueous solutions of synthetic tanning agents Aqueous solutions of synthetic tanning agents comprising (A) a lithium salt of a synthetic, anionic aromatic tanning agent or the anionic non-condensed precursor thereof, and, as optional components, (B) a water-soluble chromium, aluminum, iron or zirconium salt or... | 11/23/1993 |
| 5250079 | Process for the treatment of polyamide or leather substrates with sulpho group-containing aromatic compounds, compositions containing such compounds and their production A process for the treatment of fibrous material from aqueous medium in the presence of an application assistant (P) comprising components (a) and (b), in particular for nitrogen-containing substrates; the compositions (P), (P1) and (P2 | 10/05/1993 |
| 5103521 | Leather treatment agent and its use Leather treatment agent containing a mixture a) of a carboxylic acid X--COOH I wherein X represents --[R--CO--Z--(R'--Z)a ]b --CO--R--COOH 1 or --R"--(Z--R')c --Z--CO--R--COOH ... | 04/14/1992 |
| 5011499 | Tanning agent formulation for manufacture of semifinished leather products A tanning agent formulation obtained by reacting 1 mole of an aliphatic ω,ω'- dialdehyde having 2-8 carbon atoms in the form of an aqueous solution of about 3-60% strength with about 0.2-4 moles of a hydroxy compound of the formula R1 --O--[(... | 04/30/1991 |
| 5002566 | Calcification mitigation of bioprosthetic implants Calcification resistant bioprosthetic implants are made from tanned biological materials, such as porcine heart valves, bovine pericardium, human dura mater or the like, which has been impregnated with a calcification-mitigating effective amount of a ferr... | 03/26/1991 |
| 5002584 | Seasoning agents for leathers and leatherlike materials Seasoning agents for leather and leatherlike materials contain solutions of cellulose acetobutyrate having a butyryl contentࣙ45% by weight.... | 03/26/1991 |
| 4978361 | Economy chrome tanning Process for economy chrome tanning, which comprises pretreating the pelt prior to tanning with 0.5 to 2% by weight, preferably 0.7 to 1,2% by weight, of an aldehyde- or keto-carboxylic acid, tanning in a conventional manner and then finish-tanning with 2 ... | 12/18/1990 |
| 4963156 | Tanning agent and process A leather tanning agent for use as a sole tannage or with another includes Al (III) ions, Ti (IV) ions and an organic masking agent in specific proportions. The ratio of Ti:Al expressed as metal oxides TiO2 :Al2 O3 on a we... | 10/16/1990 |
| 4946471 | Adhesion promoter for leather finishing Copolymers of (A) monomers containing amino groups and corresponding to general formula (I) ##STR1## in which each of R1 and R2 independently represents a hydrogen or a methyl group; Z represents either an oxygen or a --NH-- gro... | 08/07/1990 |
| 4938779 | Chrome tanning of leather with reduced waste of chromium The efficiency of chromium utilization in chrome tanning of hides to make leather is greatly improved by performing the preliminary neutralization of the acid tanning liquor in the presence of an aldehydo or keto acid, before conventional subsequent neutr... | 07/03/1990 |
| 4937009 | Leather tanning process using aluminium (III) and titanium (IV) complexes In a leather tanning process, animal skins are treated with a tanning agent comprising an aluminium (III)/titanium (IV) mixed complex with a salt of a polyhydroxymonocarboxylic acid as a masking compound. The masking compound preferably has the general fo... | 06/26/1990 |
| 4889811 | Methods for making leather Methods for making leather from animal hides and skins in the presence of surface active agents wherein certain phosphonic acid compounds are used in place of, or in combination with, known surface active agents.... | 12/26/1989 |
