Patent US3870464A successfully refreshed from Google Patents.
US3870464A
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Process for tanning with a multivalent metal and an organic compound
Assignee: National Research Development Corp UK
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Filing: 1971-07-23
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Granted: 1975-03-11
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Expires: 1991-07-23
Abstract
Abstract A process for tanning hides or skins comprises firstly treating the hide or skin with a basic salt of a multivalent metal, secondly treating the hide or skin under alkaline conditions with an organic compound having a long chain aliphatic group and at least one reactive group capable of entering into a complex with a basic salt of a multivalent metal, and thirdly treating the hide or skin with a salt of a multivalent metal.
Inventors
- 👤 Philip Stanley Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:12
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/28
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
93 words
A process for the tanning of a hide or skin which comprises firstly treating the hide or skin with a basic tanning salt of a multivalent metal, secondly treating the hide or skin with an organic compound having a long chain aliphatic group while maintaining alkaline pH conditions during such treatment said compound having at least one reactive group capable of entering into a metal complex with the basic tanning salt of a multivalent metal, and thirdly treating the hide or skin with a salt of a multivalent metal at an acid pH.
Claim 2
Dependent Claim
93 words
A process for the tanning of a hide or skin which comprises firstly treating the hide or skin with a basic tanning salt of a multivalent metal, secondly treating the hide or skin with an organic compound having a long chain aliphatic group while maintaining alkaline pH conditions during such treatment said compound having at least one reactive group capable of entering into a metal complex with the basic tanning salt of a multivalent metal, and thirdly treating the hide or skin with a salt of a multivalent metal at an acid pH.
Claim 3
Dependent Claim
92 words
A PROCESS FOR THE TANNING OF A HIDE OR SKIN WHICH COMPRISES FIRSTLY TREATING THE HIDE OR SKIN WITH A BASIC TANNING SALT OF A MULTIVALENT METAL, SECONDLY TREATING THE HIDE OR SKIN WITH AN ORGANIC COMPOUND HAVING A LONG CHAIN ALIPHATIC GROUP WHILE MAINTAINING ALKALINE PH CONDITIONS DURING SUCH TREATMENT SAID COMPOUND HAVING AT LEAST ONE REACTIVE GROUP CAPABLE OF ENTERING INTO A METAL COMPLEX WITH THE BASIC TANNING SALT OF A MULTIVALENT METAL, AND THIRDLY TREATING THE HIDE OR SKIN WITH A SALT OF A MULTIVALENT METAL AN ACID PH.
Claim 4
Dependent Claim
92 words
A PROCESS FOR THE TANNING OF A HIDE OR SKIN WHICH COMPRISES FIRSTLY TREATING THE HIDE OR SKIN WITH A BASIC TANNING SALT OF A MULTIVALENT METAL, SECONDLY TREATING THE HIDE OR SKIN WITH AN ORGANIC COMPOUND HAVING A LONG CHAIN ALIPHATIC GROUP WHILE MAINTAINING ALKALINE PH CONDITIONS DURING SUCH TREATMENT SAID COMPOUND HAVING AT LEAST ONE REACTIVE GROUP CAPABLE OF ENTERING INTO A METAL COMPLEX WITH THE BASIC TANNING SALT OF A MULTIVALENT METAL, AND THIRDLY TREATING THE HIDE OR SKIN WITH A SALT OF A MULTIVALENT METAL AN ACID PH.
Claim 5
Dependent Claim
25 words
A process according to claim 1, in which the treatment with the organic compound is carried out at a pH of from 7.5 to 9.
Claim 6
Dependent Claim
19 words
A process according to claim 2, in which the required pH is maintained by addition of a weak alkali.
Claim 7
Dependent Claim
37 words
A process according to claim 1, in which the leather is washed and neutralised throughout its whole thickness after tanning with the basic tanning salt of a multivalent metal and prior to treatment with the organic compound.
Claim 8
Dependent Claim
26 words
A process according to claim 1, in which the basic tanning salt of a multivalent metal is a basic salt of chromium, aluminium, zirconium or cerium.
Claim 9
Dependent Claim
17 words
A process according to claim 1, in which the basic tanning salt is a mineral acid salt.
Claim 10
Dependent Claim
43 words
A process according to claim 1, in which the quantity of the basic tanning salt of a multivalent metal used is sufficient to give from 1.5 to 5.0% by weight of metal oxide based on the dry weight of the hide or skin.
Claim 11
Dependent Claim
23 words
A process according to claim 1, in which the long chain aliphatic group contains a chain of from six to 36 carbon atoms.
Claim 12
Dependent Claim
22 words
A process according to claim 8, in which the organic compound is one that contains two or more long chain aliphatic groups.
Claim 13
Dependent Claim
30 words
A process according to claim 1, in which the reactive group of the organic compound is a chloro, nitro, sulphonate, phosphate, carbonate, borate, citrate, thiocyanate, sulphate, amino or carboxyl group.
Claim 14
Dependent Claim
27 words
A process according to claim 1, in which the organic compound contains two or more reactive groups separated by a chain of at least six carbon atoms.
Claim 15
Dependent Claim
61 words
A process according to claim 1, in which the organic compound is an alkali metal, ammonium or organic base salt of a long chain aliphatic carboxylic acid, a half ester of a long chain aliphatic dicarboxylic acid, a salt of a sulphonated or sulphated long chain mono carboxylic acid, a sulphonated or sulphated triglyceride, or a long chain aliphatic amino acid.
Claim 16
Dependent Claim
27 words
A process according to claim 1, in which the quantity of organic compound used is from 3 to 8% based on the shaved weight of the leather.
Claim 17
Dependent Claim
31 words
A process according to claim 1, in which the treatment with the organic compound is carried out in the presence of a water-soluble or water miscible alcohol or a liquid hydrocarbon.
Claim 18
Dependent Claim
52 words
A process according to claim 1, in which the hide or skin is immersed in an aqueous solution of the basic tanning salt of the multivalent metal, the pH of the hide or skin in the aqueous solution is brought up to the desired value, and the organic compound is then added.
Claim 19
Dependent Claim
29 words
A process according to claim 1, in which after treatment with the organic compound, the hide or skin is further treated with a basic salt of a multivalent metal.
Claim 20
Dependent Claim
35 words
A process according to claim 16, in whiCh the basic salt of a multivalent metal that is used to further treat the hide or skin is a basic salt of chromium, aluminum, zirconium or cerium.
Claim 21
Dependent Claim
37 words
A process according to claim 16, in which the quantity of basic salt used for the further treatment is from 1.0 to 3.0% by weight, calculated as metal oxide, based on the shaved weight of the leather.
Claim 22
Dependent Claim
29 words
A process according to claim 1, in which, after treatment with the organic compound, the hide or skin is further treated with a normal salt of a multivalent metal.
Claim 23
Dependent Claim
21 words
A process according to claim 19, in which the normal salt is a salt of copper, zinc, zirconium, aluminium or nickel.
Claim 24
Dependent Claim
37 words
A process according to claim 19, in which the quantity of normal salt used for the further treatment is from 1.0 to 3.0% by weight, calculated as metal oxide, based on the shaved weight of the leather.
Claim 25
Dependent Claim
49 words
A LEATHER TANNED WITH A BASIC TANNING SALT OF A MULTIVALENT METAL AND CONTAINING ON ADSORBED COMPLES OF AN ORGANIC COMPOUND, HAVING A LONG CHAIN ALIPAHTIC GROUP AND A SINGLE REACTIVE GROUP, AND A SLAT OF A MULTIVALENT METAL, SAID LEATHER BEING PRODUCED BY THE PROCESS OF CLAIM 1.
Claim 26
Dependent Claim
49 words
A leather tanned with a basic tanning salt of a multivalent metal and containing an adsorbed complex of an organic compound, having a long chain aliphatic group and a single reactive group, and a salt of a multivalent metal, said leather being produced by the process of claim 1.
Claim 27
Dependent Claim
26 words
A leather according to claim 22, in which the basic tanning salt of a multivalent metal is a basic salt of chromium, aluminium, zirconium or cerium.
Claim 28
Dependent Claim
43 words
A leather according to claim 22, in which the organic compound is an alkali metal, ammonium or organic base salt of a long chain aliphatic carboxylic acid, a half ester of a long chain dicarboxylic acid, or a long chain aliphatic amino acid.
Claim 29
Dependent Claim
32 words
A leather according to claim 22, in which the salt of a multivalent metal that is used to further treat the leather is a basic salt of chromium, aluminium, zirconium or cerium.
Claim 30
Dependent Claim
33 words
A leather according to claim 22, in which the salt of a multivalent metal that is used to further treat the leather is a normal salt of copper, zinc, zirconium, aluminium or nickel.
Claim 31
Dependent Claim
53 words
A leather tanned with a basic tanning salt of a multivalent metal and containing chemically bonded residues of a complex of an organic compound, having a long chain aliphatic group and two or more reactive groups, and a salt of a multivalent metal, said leather being produced by the process of claim 1.
Claim 32
Dependent Claim
26 words
A leather according to claim 27, in which the basic tanning salt of a multivalent metal is a basic salt of chromium, aluminium, zirconium or cerium.
Claim 33
Dependent Claim
30 words
A leather according to claim 27, in which the organic compound is a salt of a sulphonated or sulphated long chain mono carboxylic acid, or a sulphonated or sulphated triglyceride.
Claim 34
Dependent Claim
32 words
A leather according to claim 27, in which the salt of a multivalent metal that is used to further treat the leather is a basic salt of chromium, aluminium, zirconium or cerium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |