US4126413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tanning with carboxylic acid carrying ester, urethane and/or amide group
Assignee: Bayer AG
•
Filing: 1977-05-31
•
Granted: 1978-11-21
•
Expires: 1997-05-31
Abstract
Abstract In the tanning or re-tanning of a hide with a tanning composition comprising a tanning-active substance and at least one of a Cr(III) salt, a dicarboxylic acid, a dicarboxylic acid salt, an emulsifier and an acid-binding agent, the improvement which comprises employing as said tanning-active substance a carboxylic acid carrying at least one of an ester, urethane or amide group. Advantageously the agent has at least two carboxyl groups per molecule and a molecular weight of about 170 to 30,000, preferably 310 to 10,000. The products are softer and better through-tanned and there is maximum utilization of chromium, thereby minimizing the waste disposal problem.
Inventors
- 👤 Harro Traubel
- 👤 Helga Heinze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:24
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/04; C14C3/06; C14C3/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
In the tanning or re-tanning of a hide with a tanning composition comprising a tanning-active substance and a Cr(III) salt, the improvement which comprises employing as said tanning-active substance a polycarboxylic acid compound which has been reacted to give a partial ester, urethane or amide.
Claim 2
Dependent Claim
45 words
In the tanning or re-tanning of a hide with a tanning composition comprising a tanning-active substance and a Cr(III) salt, the improvement which comprises employing as said tanning-active substance a polycarboxylic acid compound which has been reacted to give a partial ester, urethane or amide.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1, wherein the tanning-active substance has a molecular weight of from about 170 to 30,000.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 1, wherein the tanning-active substance is used in a quantity of from about 0.1 to 100% based on the weight of the hides.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 3, wherein the tanning-active substance has a molecular weight from about 310 to 10,000.
Claim 6
Dependent Claim
24 words
A tanning composition comprising a polycarboxylic acid compound which has been reacted to give a partial ester, urethane or amide, and a Cr(III) salt.
Claim 7
Dependent Claim
24 words
A tanning composition comprising a polycarboxylic acid compound which has been reacted to give a partial ester, urethane or amide, and a Cr(III) salt.
Claim 8
Dependent Claim
22 words
A tanning composition according to claim 5, wherein the polycarboxylic acid compound has a molecular weight of from about 170 to 30,000.
Claim 9
Dependent Claim
22 words
A tanning composition according to claim 5, wherein the polycarboxylic acid compound has a molecular weight of from about 310 to 10,000.
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) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |