Process for producing leather
US-2019309378-A1 · Oct 10, 2019 · US
Production of leather
US11001902B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11001902-B2 |
| Application number | US-201414767399-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 12, 2014 |
| Priority date | Feb 14, 2013 |
| Publication date | May 11, 2021 |
| Grant date | May 11, 2021 |
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Abstract
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In a method of producing leather comprising a plurality of steps, methanesulfonic acid is used in at least one step.
First claim
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We claim: 1. A method of producing soft leather, the process comprising: performing a deliming operation of an animal hide in an aqueous deliming solution having a pH of from 7.5 to 8.5, the deliming solution comprising: from 0.05 to 0.5 wt. % methanesulfonic acid, sodium hydrogensulfite; from 0.5 to 2 wt % of ammonium sulfate, and from 0.6 to 1.0 wt. % of formic acid; for at least 20 minutes to remove calcium ions from the animal hide and increase a free calcium ions concentration in the deliming aqueous solution. 2. The method of claim 1 , wherein methanesulfonic acid is used in the form of a mixture comprising a salt and/or another acid and/or an acid derivative. 3. The method of claim 1 , wherein the leather is chrome-tanned leather. 4. The method of claim 1 , wherein in the deliming operation the methanesulfonic acid is added in the amount of from 0.07 to 0.2 wt. % of the aqueous deliming solution. 5. The method of claim 1 , wherein an ammonium salt of a dicarboxylic acid is further added to the aqueous deliming solution in the deliming operation. 6. The method of claim 1 , wherein an aliphatic dicarboxylic acid is further added to the aqueous deliming solution in the deliming operation. 7. The method of claim 1 , wherein a carboxylic ester is further added to the aqueous deliming solution in the deliming operation. 8. The method of claim 1 , wherein the aqueous deliming solution comprises from 0.05 to 0.2 wt % of the methanesulfonic acid, in the deliming operation. 9. The method of claim 1 , wherein the deliming operation is performed for 30 minutes to 4 hours.
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- What does patent US11001902B2 cover?
- In a method of producing leather comprising a plurality of steps, methanesulfonic acid is used in at least one step.
- Who is the assignee on this patent?
- Basf Se
- What technology area does this patent fall under?
- Primary CPC classification C14C1/08. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 11 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).