Retanning and fatliquoring compositions comprising hemp oil derivatives

Abstract

The present invention relates to the use of a hemp oil derivative in at least one step of a leather processing process in the leather industry, wherein the hemp oil derivative is selected from the group consisting of sulfated hemp oil, sulfited hemp oil, phosphorylated hemp oil and a mixture thereof. The present invention also relates to a composition comprising: a hemp oil derivative selected from the group consisting of sulfated hemp oil, sulfited hemp oil, phosphorylated hemp oil and a mixture thereof, and a phosphorylated (C8-C 24 ) fatty alcohol.

Description

Technical Field

[0001] The present invention relates to novel retanning and fatliquoring compositions for the leather industry. Background Art

[0002] It is well known that the leather industry uses a large number of chemical products; in fact, transforming animal skins into marketable leather requires a large number of treatments.

[0003] The initial steps of the process generally include soaking, liming, dehairing, fleshing and possibly splitting, deliming, softening and pickling, the purpose of which is to remove the hair, slaughter residues and unwanted epidermal and fat layers on the skin, bring it to a suitable thickness, and prepare it for the subsequent tanning step.

[0004] Tanning essentially consists of impregnating the skin with substances that irreversibly fix on the skin, preventing the skin from spoiling without altering its softness and flexibility. There are many substances that can achieve this purpose; among the most commonly used substances in the industry, we find, for example, natural tannins, synthetic tannins, chromium salts, aluminum salts, zirconium salts, marine animal oils and formaldehyde.

[0005] After the tanning step, a retanning step is carried out on the leather. In recent years, with the development of leather processing methods, retanning and fatliquoring are considered to play a decisive role together. In fact, the retanning step not only provides the leather with better mechanical resistance and uniformity, but also provides softness, elasticity and lightness. In fact, retanning is the basis for determining the high quality of the leather and some of its final properties. Especially in the case of chrome-tanned leather, retanning can provide the leather with better fullness.

[0006] Then a dyeing step is carried out on the leather, or it is colored with coloring substances of natural or synthetic origin, with the aim of improving their appearance, making them more suitable for manufacturing the articles they are intended for, improving their quality, and thus increasing their commercial value.

[0007] After dyeing, the leather is fatliquored, i.e., it is lubricated to prevent defects caused by the fibers binding together and to provide the leather with softness, abrasion resistance, tear resistance, elasticity and a soft touch.

[0008] Therefore, the tanning, retanning, dyeing and final fatliquoring steps are the basic steps in the leather processing process, in which the final properties of the leather are determined and provided.

[0009] Therefore, this industrial sector has been looking for novel products that can be used in these steps of the tanning process, which allow the properties of the finished product to be adjusted as needed.

[0010] In recent years, a great deal of effort has been made, especially in the use of increasingly natural derivative products in the tanning process, which is inherently more sustainable in terms of environmental impact, less aggressive in terms of potential irritation / allergic effects remaining in the leather after processing, and better obtained from the waste of other industrial processes, in pursuit of the logic of the circular economy.

[0011] For example, international patent application WO2018 / 025210 describes the use of olive mill wastewater, which is an olive mill waste with a high environmental impact, as an innovative retanning agent in the leather industry, replacing traditional and polluting metal tanning agents (such as chromium).

[0012] Italian patent application 102012902059846 describes a new leather dyeing process using natural dyes that does not use metals at all.

[0013] Therefore, many research directions are actively dedicated to finding new compositions with properties suitable for the leather industry, which allow leather treatment by less chemically aggressive methods while producing valuable finished leather adapted to the market.

[0014] Therefore, the main object of the present invention is to identify new compositions of natural origin and low environmental impact for the leather industry. Summary of the Invention

[0015] In fact, the inventors surprisingly found that they could use hemp oil in the leather industry and obtained surprising results in certain steps of the tanning process by derivatizing the oil. Different from other vegetable oils widely used in tanneries, hemp oil itself cannot be used because it contains a high content of particularly drying ricinoleic acid, which makes it unable to penetrate sufficiently into the leather fibers. In fact, when used on leather, hemp oil remains on the surface, leaving an unacceptable and unpleasant oil film.

[0016] Surprisingly, the inventors found that specific hemp oil derivatives can be used in the steps of the leather processing process, and in particular, exhibit excellent retanning and fatliquoring activity on leather and surprisingly facilitate leather dyeing.

[0017] Therefore, in a first aspect, the present invention relates to the use of hemp oil derivatives in at least one step of the leather processing process in the leather industry, wherein the hemp oil derivatives are selected from the group consisting of sulfated hemp oil, sulfited hemp oil, phosphorylated hemp oil, and mixtures thereof.

[0018] In a first embodiment, the present invention relates to the use of the hemp oil derivatives in one step of the leather processing process in the leather industry, and this step is the retanning step.

[0019] In a second embodiment, the present invention relates to the use of said cannabis oil derivative in a step of the leather processing process in the tanning industry, which step is the fatliquoring step.

[0020] In an advantageous and preferred aspect, the present invention relates to the use of phosphorylated (C 8 -C 24 ) fatty alcohols having 1 to 2 hydroxyl groups in combination with said cannabis oil derivative, said cannabis oil derivative being selected from the group consisting of sulfated cannabis oil, sulfited cannabis oil, phosphorylated cannabis oil, and mixtures thereof.

[0021] Accordingly, the present invention also relates to a composition comprising:

[0022] - a cannabis oil derivative selected from the group consisting of sulfated cannabis oil, sulfited cannabis oil, phosphorylated cannabis oil, and mixtures thereof, and

[0023] - phosphorylated (C 8 -C 24 ) fatty alcohols having 1 to 2 hydroxyl groups. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shows a comparison between the FT-IR spectra of crude cannabis oil and sulfated cannabis oil of Example 1 (a specific peak appearing at about 1235 cm -1 indicates sulfation). DETAILED DESCRIPTION

[0025] The present invention relates to the use of cannabis oil derivatives in at least one step of the leather processing process in the tanning industry, wherein said cannabis oil derivative is selected from the group consisting of sulfated cannabis oil, sulfited cannabis oil, phosphorylated cannabis oil, and mixtures thereof.

[0026] Cannabis oil is typically obtained from Cannabis sativa seeds by cold pressing. It is a vegetable oil rich in essential fatty acids and has strong antioxidant, immunomodulatory, and anti-inflammatory properties.

[0027] The inventors have now surprisingly found that certain specific cannabis oil derivatives can be used in steps of the tanning industry.

[0028] According to the present invention, the cannabis oil derivative is selected from the group consisting of sulfated cannabis oil, sulfited cannabis oil, phosphorylated cannabis oil, and mixtures thereof.

[0029] These derivatives can be obtained by any conventional method of the prior art that allows for the sulfation, sulfitation, or phosphorylation of the fatty acids contained in cannabis oil.

[0030] The embodiments included in this document show a typical fatty acid composition of cannabis oil. According to the present invention, the cannabis oil is then sulfated, sulfited, and phosphorylated according to techniques known in the market for sulfation reactions, sulfitation reactions, and for carboxyl phosphorylation.

[0031] Preferably, the sulfated cannabis oil derivative can be obtained by a sulfation reaction with sulfuric acid having an acid concentration of 94% to 98%. More preferably, the reaction time is 30 to 180 minutes, the reaction temperature is 15°C to 40°C, and even more preferably, the reaction is carried out at 20°C for 120 minutes.

[0032] Advantageously, after the sulfation reaction, the sulfated derivative is washed, preferably with a washing solution comprising water, potassium hydroxide, and sodium chloride. The washing can be carried out at a temperature of 20°C to 70°C, preferably at 45°C.

[0033] Once separated from the washing solution, the sulfated cannabis oil derivative can be neutralized, and it is advantageous to use triethanolamine.

[0034] The sulfated and neutralized derivative can be advantageously formulated in a composition comprising additives such as fungicides and antioxidants.

[0035] Specifically, the sulfation, sulfitation, or phosphorylation process allows for a degree of sulfation, sulfitation, and phosphorylation of at least 1%. At least 1% refers to the weight percentage of the combined sulfated, sulfited, or phosphorylated groups present after the reaction, relative to the total weight of the cannabis oil obtained at the end of the reaction.

[0036] Preferably, the weight percentage of the sulfated, sulfited, and phosphorylated groups of the cannabis oil derivative is in the range of 0.5 to 10, relative to the total weight of the cannabis oil.

[0037] Preferably, the cannabis oil derivative is sulfated cannabis oil.

[0038] Even more preferably, the degree of sulfation of the sulfated cannabis oil, expressed as a percentage of sulfated groups, is in the range of 2% to 10% by weight, more preferably 2.5% to 6.5% by weight, relative to the total weight of the cannabis oil.

[0039] The inventors also surprisingly found that the specific cannabis oil derivative specifically exhibits excellent retanning properties.

[0040] Therefore, in a first embodiment, the present invention relates to the use of the cannabis oil derivative in one step of the leather processing process in the leather industry, and this step is the retanning step.

[0041] The inventors have also tested the specific hemp oil derivatives in the fatliquoring step and found that, unlike the hemp oil itself, they have excellent fatliquoring properties.

[0042] Accordingly, in a second embodiment, the present invention relates to the use of said hemp oil derivatives in one step of the leather processing process in the tanning industry, which step is the fatliquoring step.

[0043] In an advantageous and surprising aspect, the hemp oil derivatives of the present invention are used in combination with phosphorylated (C 8 -C 24 ) fatty alcohols having 1 to 2 hydroxyl groups.

[0044] As is apparent from the following experimental section, in fact, the inventors surprisingly found that when sulfated hemp oil is used in combination with phosphorylated fatty alcohols, the retanning and fatliquoring properties of the composition are greatly improved, and the properties of the treated leather reach the highest standards.

[0045] The combined use of phosphorylated fatty alcohols and hemp oil derivatives can be carried out by initially preparing a composition containing them, or can be carried out sequentially in any order.

[0046] Accordingly, in another aspect, the present invention relates to a composition comprising:

[0047] - a hemp oil derivative selected from the group consisting of sulfated hemp oil, sulfited hemp oil, phosphorylated hemp oil, and mixtures thereof, and

[0048] - a phosphorylated (C 8 -C 24 ) fatty alcohol having 1 to 2 hydroxyl groups.

[0049] These compositions are more easily emulsified in water and are therefore able to better penetrate the leather fibers, uniformly throughout its entire cross-section, producing a plump, round, and rubbery leather with a comfortable touch, a silky appearance, and intense and deep colors.

[0050] The phosphorylated (C 8 -C 24 ) fatty alcohol having 1 to 2 hydroxyl groups present in the composition used according to the present invention is preferably in the form of a salt. More preferably, the phosphorylated (C 8 -C 24 ) fatty alcohol salt is phosphorylated (C 8 -C 24 ) fatty alcohol triethanolamine (TEA).

[0051] Preferably, the composition comprises a sulfated hemp oil derivative in a concentration of 35% to 99% by weight and a phosphorylated (C 8 -C24 ) Fatty alcohols. The composition of the present invention may further comprise additives.

[0052] The composition of the present invention may comprise additives for the final formulation, preferably ethoxylated castor oil, isopropanol and butanediol.

[0053] Thus, in another aspect, the present invention relates to the use of the composition of the present invention in at least one step of the leather processing process in the leather industry, preferably in the retanning and / or fatliquoring and / or dyeing steps.

[0054] The fatliquoring and retanning properties of the hemp oil derivatives of the present invention and the composition comprising sulfated hemp oil and phosphorylated fatty alcohols were tested and the results were good. It can be clearly seen from the following experimental section that the treated leather produced according to the use of the hemp oil derivatives and composition of the present invention in the present invention has better aesthetic properties and is also better in terms of color clarity and touch compared to the leather treated with known products.

[0055] The composition comprising sulfated hemp oil and phosphorylated fatty alcohols has also been proven to be particularly advantageous, as will be clearly seen from the following experimental section.

[0056] Experimental section

[0057] Example 1 - Synthesis of sulfated hemp oil.

[0058] The hemp oil with a fatty acid composition as shown in Table 1 below was sulfated by treatment with 180 g of 96% sulfuric acid at room temperature (about 20 °C).

[0059] Fatty acid Content (%) Lauric acid ≤0.2 Myristic acid ≤0.3 Palmitic acid 4.0-10.0 Palmitoleic acid ≤0.05 Margaric acid ≤0.01 Margaroleic acid ≤0.01 Stearic acid 1.0-4.0 Oleic acid 6.0-20.0 Linoleic acid 45.0-65.0 α-Linolenic acid 14.0-28.0 γ-Linolenic acid ≤4 Arachidic acid ≤2 Eicosenoic acid ≤1.5 Behenic acid ≤1 Erucic acid ≤1 Lignoceric acid ≤0.5 (Trans) Oleic acid ≤1 (Trans) Linoleic acid ≤1.5 (Trans) Linolenic acid ≤1

[0060] Table 1 - Fatty acid content, expressed as a weight percentage relative to the total weight of the analyzed hemp oil, determined by gas chromatography analysis.

[0061] The sulfation reaction was carried out with slow stirring for about 2 hours to obtain an acidic hemp oil mixture.

[0062] Subsequently, at a temperature of about 45 °C, the acidic hemp oil mixture was added to a washing solution consisting of 1500 g of water, 280 g of 50% potassium hydroxide and 500 g of 100% sodium chloride, and stirring was maintained for about 5 minutes.

[0063] Then the mixture was maintained at a temperature of about 45 °C for another 15 hours until the phases were completely separated.

[0064] Then, the upper oil phase (consisting of hydrated sulfated hemp oil) is neutralized; specifically, at a temperature of about 25 °C, 1150 g of 90% hydrated sulfated hemp oil is reacted with 30 g of 80% triethanolamine for about 10 minutes.

[0065] At the end of the neutralization reaction, a fairly clear brown / green oil is obtained, and its degree of sulfation, expressed as the weight percentage of sulfate groups relative to the total weight of the obtained hemp oil, is approximately 4.4%.

[0066] As compared in Figure 1 FT-IR spectra of crude hemp oil and the sulfated oil obtained therefrom confirmed the occurrence of the sulfation reaction. A specific peak appearing at about 1235 cm -1 indicates the occurrence of sulfation.

[0067] Example 2 - Synthesis of Sulfited Hemp Oil Derivative

[0068] The synthesis of the sulfated hemp oil derivative of Example 1 is repeated, but sodium bisulfite is used instead of sulfuric acid. An oil is thus obtained, and its degree of sulfitation is approximately 5% relative to the total weight of the obtained hemp oil.

[0069] Example 3 - Synthesis of Phosphorylated Hemp Oil Derivative

[0070] The synthesis of the sulfated hemp oil derivative of Example 1 is repeated, but phosphoric acid is used instead of sulfuric acid. An oil is thus obtained, and its degree of phosphorylation is approximately 3% relative to the total weight of the obtained hemp oil.

[0071] Example 4 - Preparation of a Composition Comprising a Sulfated Hemp Oil Derivative.

[0072] The sulfated derivative of Example 1 is stabilized by preparing a composition suitable for application to leather. Specifically, at a temperature of about 25 °C, 30 g of triethanolamine, 3 g of 100% antioxidant compound BHT (butylated hydroxytoluene), 1 g of 20% fungicidal mixture of MIT / BIT (methylisothiazolinone / benzylisothiazolinone) in a 50 / 50 weight ratio, 60 g of 100% butanediol, and finally 200 g of water are added to 1150 g of the sulfated hemp oil derivative from Example 1, and the mixture is stirred for about 10 minutes. An off-white aqueous emulsion is obtained at the end of the mixing.

[0073] Example 5 - Preparation of a Composition According to the Invention, the Composition Comprising Sulfated Hemp Oil and Phosphorylated Fatty Alcohol Salted with Triethanolamine (TEA).

[0074] At a temperature of 20 °C, 725 g of the sulfated derivative of Example 1 is mixed with 80 g of phosphorylated (C 16 -C 18)A 50 / 50 mixture of fatty alcohols, 10 g of ethoxylated castor oil, 5 g of isopropyl alcohol, 10 g of butanediol and 170 g of water were mixed: The mixing was carried out for about half an hour.

[0075] The pH value of the obtained final composition was about 6.5 and the viscosity was 1230 mPa·S. The degree of phosphorylation of the final composition was 3010 mg P per kg of the final composition, equivalent to 0.92% PO 4 , and the degree of sulfation was 19400 mg S per kg of the final composition, equivalent to 4.85% SO 3 .

[0076] Example 6 - Use of the composition of the present invention in the fatliquoring, retanning and dyeing steps compared to known compositions.

[0077] In the steps of vegetable retanning, fatliquoring and dyeing, the composition of the present invention of Example 4 was used on blue wet - tanned calfskin.

[0078] Specifically, the composition of the present invention was used instead of known retanning and fatliquoring compositions in the retanning, fatliquoring and dyeing steps.

[0079] - Treatment A with the composition of Example 4

[0080] In this experiment, the composition 4 of the present invention was used instead of the known retanning agents and fatliquoring agents used in the traditional formulation.

[0081] The leather was first treated with water, acetic acid, oxalic acid and NEMOLIX HH (degreasing additive) for 60 minutes, then drained and washed. Subsequently, the leather was treated with water, acetic acid and Correctan NSA (synthetic retanning agent) for 30 minutes, and then with Correctan KGB / SS (synthetic retanning agent), Suppletan TH / SS (chrome retanning agent), BAYCROM FD (chrome retanning agent) and DERMAGAN (sulfochlorinated paraffin, fatliquoring agent) for 60 minutes. Then, the treated leather was treated with water, sodium acetate and sodium bicarbonate for 180 minutes, then drained and washed. At this time, the leather was treated with water and the composition of Example 4 of the present invention for about 120 minutes. Then the leather treated with the composition of the present invention was treated with NEMOTAN AUTO / SS (retanning agent), SUPPLETAN RB / SS (filling resin) and CORRECTAN GN (synthetic retanning agent) for 90 minutes. After this treatment, it was treated with formic acid for 30 minutes, then drained and cooled. The final treatment of the leather included treating with water, SUPPLETAN MLR (synthetic tannin dyeing aid) and dye for 45 minutes, and then treating with formic acid and water for 30 minutes. Then the leather thus obtained was drained and cooled, and then placed under vacuum.

[0082] - Treatment B with a known composition

[0083] The leather was treated in the same manner and with the same ingredients as in Treatment A (using the composition of Example 4). The only differences were the use of the product Hydroil as a retanning agent and the use of well-known traditional products Coriol 727 (phosphate fatliquor), Nemostop 42 (fatliquor), Coriol 453 (lecithin fatliquor), Dermagan (lecithin fatliquor), Belipon OC (soap) as fatliquors, instead of the composition of Example 4 of the present invention.

[0084] - Treatment C with the composition of Example 4

[0085] The leather was treated in the same manner and with the same ingredients as in Treatment B. The only difference was the use of the composition of Example 4 of the present invention instead of the known Hydroil retanning product to better evaluate the retanning performance of the composition of the present invention.

[0086] Results

[0087] The appearance, touch and texture of the leather treated as above were evaluated.

[0088] Compared with the leather treated with the known Treatment B, the leather treated with Treatment A using the composition of Example 4 was firm, showing a plump handfeel and excellent dyeing rate. The leather treated with Treatment B (corresponding to a standard retanning, fatliquoring and dyeing formulation) was less firm and had poorer color development on the leather surface than Treatment A. This comparison demonstrated that the composition of Example 4 containing hemp oil derivatives had excellent retanning / filling properties and fatliquoring / lubricating effects.

[0089] Treatment C included using the same fatliquoring substances as in Treatment B, but using the composition of the present invention instead of the known retanning product, allowing for excellent dyeing uniformity, excellent color development, and at the same time obtaining a plump and soft leather. The leather treated with Treatment B (corresponding to a retanning formulation using the Hydroil product) was less firm and had poorer color development on the leather surface than Treatment C.

[0090] Therefore, surprisingly, the composition of Example 4 containing hemp oil derivatives could be completely emulsified, and due to its anionic nature and skin penetration, it was beneficial to the dyeability of the leather. Compared with the leather treated with the known Treatment B, the leather dyed with Treatments A and C showed better color depth and brightness.

[0091] The above results demonstrated the beneficial effects of using hemp oil derivatives in the tanning process, especially for the retanning, fatliquoring and dyeing steps.

[0092] The composition comprising the hemp oil derivative of Example 4 penetrates rapidly and uniformly throughout the cross-section of the leather, obtaining a plump, round and rubbery leather while completely exhausting the bath liquor used.

[0093] The composition comprising the hemp oil derivative of Example 4 provides softness to the leather without sagging it, a pleasant and silky touch, and excellent color and touch levels on the flesh side.

[0094] The internal leather fibers have excellent lubricity, which is crucial for passing physical / mechanical tests (such as traction, tearing, etc.).

[0095] The color is uniform and plump because the composition of Example 4 enhances the dyeing ability of the dye without highlighting the defects of the dermis.

[0096] The following table summarizes the above results for Treatments A, B, and C. The performance is evaluated on a numerical scale from 1 to 10, with higher values indicating better performance.

[0097]

[0098] Example 7 - Use of the composition of the present invention in the fatliquoring, retanning, and dyeing steps as compared to known compositions.

[0099] In the vegetable retanning, fatliquoring, and dyeing steps, the composition of the present invention of Example 5 was used on blue wet calfskin.

[0100] Specifically, in the retanning, fatliquoring, and dyeing steps, the composition of the present invention was used instead of known retanning and fatliquoring compositions. The composition of the present invention comprises, in addition to the sulfated hemp oil derivative, a phosphorylated fatty alcohol salted with triethanolamine (TEA).

[0101] - Treatment A using the composition of Example 5

[0102] The leather is first treated with water, acetic acid, oxalic acid, and NEMOLIX HH (a degreasing additive) for 60 minutes, then drained and washed. Subsequently, the leather is treated with water, acetic acid, and Correctan NSA (a synthetic retanning agent) for 30 minutes, and then treated with Correctan KGB / SS (a synthetic retanning agent), Suppletan TH / SS (a chrome retanning agent), BAYCROM FD (a chrome retanning agent), and DERMAGAN (sulfochlorinated paraffin, a fatliquoring agent) for 60 minutes. Then, the treated leather is treated with water, sodium acetate, and sodium bicarbonate for 180 minutes, then drained and washed. At this time, the leather is treated with water and the composition of Example 5 for about 120 minutes. Then, the leather treated with the composition of the present invention is treated with NEMOTAN AUTO / SS (a retanning agent), SUPPLETAN RB / SS (a filling resin), and CORRECTAN GN (a synthetic retanning agent) for 90 minutes. After this treatment, it is treated with formic acid for 30 minutes, then drained and cooled. The final treatment of the leather includes treating it with water, SUPPLETAN MLR (a synthetic tannin dyeing aid), and a dye for 45 minutes, and then treating it with formic acid and water for 30 minutes. Then, the leather thus obtained is drained and cooled, and then placed under vacuum.

[0103] - Treatment B with a known composition

[0104] The leather is treated in the same manner and with the same ingredients as in Treatment A (using the composition of Example 5). The only difference is the use of the known product Hydroil as a retanning agent, and the use of the known products Coriol 727 (a phosphate ester fatliquoring agent), Nemostop 42 (a fatliquoring agent), Coriol 453 (a lecithin fatliquoring agent), Dermagan (a lecithin fatliquoring agent), Belipon OC (a soap), which are conventionally used as fatliquoring agents, instead of the composition of Example 5 of the present invention.

[0105] - Treatment C with the composition of Example 5

[0106] The leather is treated in the same manner and with the same ingredients as in Treatment B. The only difference is the use of the composition of Example 5 of the present invention instead of the Hydroil compound of the known composition to better evaluate the retanning performance of the composition of the present invention.

[0107] - Treatment D

[0108] In this treatment, the fatliquoring performance of the composition of Example 5 of the present invention, which is used as a complete substitute for conventional fatliquoring agents, was tested.

[0109] The leather is first treated with water, acetic acid, oxalic acid and NEMOLIX HH (a degreasing additive) for 60 minutes, and then drained and washed. Subsequently, the leather is treated with water and formic acid for 10 minutes, and then treated with Cromo 33 (a chrome retanning agent), Suppletan TH / SS (a chrome retanning agent), CORIOL 727 (a phosphate fatliquor) and DERMAGAN (a sulfochlorinated paraffin, fatliquor) for 60 minutes. Then, the treated leather is treated with Suppletan Ox (an oxazolidine-based retanning agent) for 20 minutes, and then re-treated with sodium formate, sodium sulfite and sodium bicarbonate for 30 minutes. After adding water, Suppletan ANF (a filling amphoteric resin) is added for 180 minutes. Then the leather is drained and washed. At this time, the leather is treated with water and Correctan PC (a filling acrylic resin) for 30 minutes, and then treated with Fuller SA (a filler based on protein and flour), the composition of Example 5 of the present invention and Belipon OC (a soap) for 30 minutes. Then, the leather treated with the composition of the present invention is treated with NEMOTAN1200 / BV (a retanning agent) for 20 minutes, CORRECTAN GN (a synthetic retanning agent) and NEMOTAN AUTO / SS (a retanning agent) for 20 minutes. After this treatment, it is treated with NEMOTAN 2500 (a retanning agent) for 90 minutes, and then re-treated with formic acid for 30 minutes. Then the leather is drained, cooled, dyed and placed under vacuum.

[0110] Results

[0111] The appearance, touch and texture of the leather treated as described above are evaluated.

[0112] Compared with the leather treated with the known treatment B, the leather treated with treatment A using the composition of Example 5 is firm, shows a plump handfeel and an excellent dyeing rate. The leather treated with treatment B (corresponding to a standard retanning, fatliquoring and dyeing formulation) is less firm, and the color development on the leather surface is uneven and lacks color. This comparison demonstrates that the composition of Example 5 containing a hemp oil derivative and a phosphorylated fatty alcohol salted with TEA has excellent retanning / filling properties and fatliquoring / lubricating effects.

[0113] Treatment C includes using the same fatliquoring substances as in treatment B, but using the composition of the present invention instead of the known retanning product, making it possible to obtain excellent dyeing uniformity, excellent color development, and at the same time obtain a plump and soft leather. The leather treated with treatment B (corresponding to a retanning formulation using Hydroil products) is less firm, and the color development on the leather surface is worse than that of treatment C.

[0114] Thus, surprisingly, the composition of Example 5 containing a hemp oil derivative and a phosphorylated fatty alcohol salted with TEA can be completely emulsified and, due to its anionic nature and permeability in leather, favors the dyeability of leather. The leather dyed with Treatments A and C shows better color depth and brightness compared to the leather treated with the known Treatment B.

[0115] Treatment D corresponds to the treatment using the composition of Example 5 in place of the original fatliquor. The leather obtained from Treatment D is a very firm, plump, and elastic leather, while having good softness. These results are considered surprising because the treatment under discussion involves retanning with a very high resin concentration and always exhibits poor dyeability problems. On the contrary, by replacing the fatliquor of the traditional formulation with the composition of Example 5 of the present invention, an excellent dyeing rate is obtained and the permeability of the dye within the fibers is excellent.

[0116] Therefore, from the above results, during the tanning process, especially for the retanning, fatliquoring, and dyeing steps, the beneficial effect of using a hemp oil derivative together with a phosphorylated and salted fatty alcohol is evident.

[0117] The composition of Example 5 penetrates quickly and uniformly throughout the cross-section of the leather, obtaining a plump, round, and rubbery leather, completely exhausting the bath used.

[0118] The composition of Example 5 provides softness to the leather without sagging it, a pleasant and silky touch, and also excellent color and touch levels on the flesh side.

[0119] The internal leather fibers have excellent lubricity, which is crucial for passing physical / mechanical tests (such as traction, tearing, etc.).

[0120] The color is uniform and plump because the composition of Example 5 enhances the dyeing ability of the dye without highlighting the defects of the dermis.

[0121] The inventors also noticed that, in addition to the touch, the performance of the composition of Example 5 is superior to that of the composition of Example 4. The above results of Treatments A, B, C, and D are summarized in the following table. The performance is evaluated with reference to a numerical range from 1 to 10, and the higher the numerical value, the better the performance.

[0122]

Claims

1. Use of a hemp oil derivative in at least one step of a leather processing process in the leather industry, wherein the hemp oil derivative is selected from the group consisting of sulfated hemp oil, sulfited hemp oil, phosphorylated hemp oil and mixtures thereof; wherein the hemp oil derivative is combined with a phosphorylated C8-C8 oil having 1 to 2 hydroxyl groups. 24 Fatty alcohols are used in combination.

2. The use according to claim 1, wherein the step of the leather processing process in the leather industry is a retanning step.

3. The use according to claim 1, wherein the step of the leather processing process in the leather industry is a fatliquoring step.

4. The use according to any one of claims 1 to 3, wherein the cannabis oil derivative is sulfated cannabis oil.

5. The use according to claim 4, wherein the degree of sulfation of the sulphated cannabis oil is in the range of 2% to 10%.

6. The use according to claim 5, wherein the degree of sulfation of the sulphated cannabis oil is in the range of 2.5% to 6.5%.

7. A composition comprising: - a cannabis oil derivative selected from the group consisting of sulfated cannabis oil, sulfited cannabis oil, phosphorylated cannabis oil and mixtures thereof, and - Phosphorylated C8-C with 1 to 2 hydroxyl groups 24 Fatty alcohol.

8. A composition according to claim 7, wherein the cannabis oil derivative is sulfated cannabis oil.

9. A composition according to claim 8, wherein the degree of sulfation of the sulphated cannabis oil is in the range of 2% to 10%.

10. A composition according to claim 9, wherein the degree of sulfation of the sulphated cannabis oil is in the range of 2.5% to 6.5%.

11. The composition according to claim 7, wherein the phosphorylated C8-C 24 The fatty alcohol is in the form of a salt.

12. The composition according to claim 11, wherein the phosphorylated C8-C 24 The fatty alcohol is a phosphorylated C8-C 24 Fatty alcohol.

13. Use of the composition according to claim 7 in at least one step of leather processing in the leather industry.

14. The use according to claim 13, wherein the step of the leather processing process in the leather industry is a retanning step.

15. The use according to claim 13, wherein the step of the leather processing process in the leather industry is a fatliquoring step.

Images