Sulfonatocalixarene tanning agent for leather tanning and preparation method therefor
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United States of America Patent
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May 15, 2018
Issued Date -
N/A
app pub date -
Jun 18, 2015
filing date -
Sep 12, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A sulfonatocalixarene tanning agent for leather tanning and a preparation method comprises: using resorcinol and aldehyde monomers as raw materials for the tanning agent; adding an ethanol solution into the resorcinol, dropwise adding an inorganic strong acid catalyst and aldehyde derivatives, heating to react, cooling, carrying out suction filtration, repeatedly washing with ethanol and distilled water, and drying to obtain resorcinol calixarene; and weighing the resorcinol calixarene, and adding a sulfonating agent to react, thereby obtaining a sulfonatocalixarene tanning agent aqueous solution.
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International Classification(s)
- 2015 Application Filing Year
- C14C Class
- 26 Applications Filed
- 17 Patents Issued To-Date
- 65.39 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C14C Class
- 0 % this patent is cited more than
- 7 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Nov 15, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Nov 15, 2029 |
