Use of epoxidized vegetable oils as tanning agents
AssigneeWorkem S.R.L. Unipersonale
InventorsGiacomo Monteverde, Giuseppe Monteverde, Massimiliano Franceschi, Silvia Pierozzi, Antonio Cecchi
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Abstract
The present invention relates to the tanning industry and in particular to the use of an epoxidized vegetable oil as a tanning agent in at least one step of the leather processing process of the tanning industry.
Claims23
A method of using an aqueous emulsion as a tanning agent in at least one step of a leather processing process of the tanning industry, wherein said method comprises:
- (a) suspending a leather to be tanned in an aqueous medium;
- and
- (b) contacting the leather with an aqueous emulsion comprising at least one epoxidized vegetable oil and at least one emulsifying agent, wherein said emulsifying agent is selected from the group consisting of:
- polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, sorbitan monostearate, sorbitan monooleate and mixtures thereof.
A process for tanning a leather comprising the steps of:
- (a) suspending a leather to be tanned in an aqueous medium;
- (b) bringing the pH of said aqueous medium of step (a) to a value from 3 to 6;
- and
- (c) contacting the leather of step (b) with at least one epoxidized vegetable oil, wherein the epoxidized vegetable oil is added in the form of an aqueous emulsion comprising at least one epoxidized vegetable oil and at least one emulsifying agent, wherein said emulsifying agent is selected from the group consisting of:
- polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, sorbitan monostearate, sorbitan monooleate and mixtures thereof.
An aqueous emulsion comprising at least one epoxidized hemp or vegetable oil and at least one emulsifying agent, wherein said emulsifying agent is selected from the group consisting of:
- polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, sorbitan monostearate, sorbitan monooleate and mixtures thereof, and wherein said emulsifying agent has an HLB (Hydrophilic-Lipophilic Balance) comprised in the range of 9 to 13.
Dependencies are inferred from the claim text.