Plant-based resin for paint

Abstract

The invention relates to a plant-based resin for providing a paint, said resin comprising at least 51% by weight of a linseed oil and a plant-based compound chosen from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, gum lac, and a mixture thereof, characterized in that said resin has a kinematic viscosity at 40°C of between 1500 and 15,000 mm2 / s, preferably between 1500 and 10,000 mm2 / s, more preferentially between 1500 and 8000 mm2 / s, even more preferentially between 1500 and 7000 mm2 / s, determined according to standard ASTM D445-06.

Description

[0001] PLANT-BASED RESIN FOR PAINTING

[0002] The present invention relates to a resin of plant origin for providing a paint, a bio-based paint comprising the resin according to the invention, the use of the resin, any product containing the resin and manufacturing processes.

[0003] Generally, paints include at least the following elements: a solvent, a pigment, a binder, and additives.

[0004] The binder (or resin) is generally the main component of paint and allows the pigments to bind together once the paint is dry, thus forming a film on a substrate. Types of binders include alkyd, acrylic, polyurethane, and epoxy resins. It is possible to eliminate the need for organic solvents in the case of acrylic paints.

[0005] One of the major drawbacks of current paints is related to the presence of petroleum-based products, microplastics and preservatives that are endocrine disruptors.

[0006] Pigments are solid particles that give paint its color, opacity, and ability to protect surfaces. They can be organic, inorganic, natural, or synthetic. Titanium dioxide is widely used in paint compositions. It should be noted that regulations, particularly European ones, are increasingly aimed at reducing pigment content, especially that of titanium dioxide.

[0007] Solvents (or thinners) dissolve the binder and facilitate the application of the paint. They evaporate once the paint has been applied. Water can be used as a solvent for water-based paints, while organic solvents such as white spirit or acetone are used for solvent-based paints.

[0008] Additives improve certain properties of paint, such as durability, UV resistance, moisture resistance, and drying time. They include drying agents, anti-foaming agents, UV stabilizers, thickening agents, and dispersing agents.

[0009] Unfortunately, solvent-based paints release Volatile Organic Compounds (VOCs), which contribute to indoor and outdoor air pollution and can be harmful to human health. Furthermore, leftover paint and solvents used to clean tools are often considered hazardous waste.

[0010] Some pigments and solvents can be toxic and cause skin irritation, respiratory problems, headaches, and other health issues. These chemical components can also contaminate soil and waterways, affecting wildlife and vegetation.

[0011] Paints can degrade under the effects of UV rays, humidity, and temperature variations, requiring repeated applications. Some paints are also difficult to clean and maintain, especially outdoors where weather conditions are harsher.

[0012] Solvent-based paints can have long drying times, delaying project completion. Furthermore, solvents often emit strong, unpleasant odors, making painting uncomfortable.

[0013] There are other alternative compositions.

[0014] Water-based paints contain fewer VOCs and are more environmentally friendly but are less effective because of the premature yellowing of the composition over time.

[0015] Solvent-free paints that use less toxic binders and pigments, or even so-called green ecological paints that are formulated from renewable and biodegradable raw materials, are options that are beginning to take shape on the market.

[0016] Unfortunately, current solutions are not yet sufficiently effective in terms of quality, drying time, opacity, penetration, viscosity, and appearance (yellowing over time). Indeed, their performance depends heavily on the presence of petroleum-based additives, which constitute a source of environmental pollution.

[0017] There is therefore a real need to provide a plant-based and biodegradable resin which alone can guarantee a whiteness that would be maintained over time, which would act as a binder without the addition of petroleum-based materials and which would allow control of drying time, viscosity, opacity, and maintenance of its (white) color with little or no addition of petroleum-based additives.

[0018] To solve these problems, the present invention relates to a plant-based resin for providing a paint, said resin comprising at least 51% by weight of linseed oil and a plant-based compound selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin, and mixtures thereof, characterized in that said resin has a kinematic viscosity at 40 °C of between 1500 and 15,000 mm³ 2 / s, preferably between 1500 and 10,000 mm 2 / s, more preferably between 1500 and 8000 mm 2 / s, more preferably between 1500 and 7000 mm 2 / s, determined according to ASTM D445-06.

[0019] The resin according to the invention provides a ready-to-use plant-based resin without the need for solvents, thinners, or any petrochemical additives, while minimizing the TiCb content in a paint product. This is advantageous because the resin provides an excellent base for a paint formulation that is environmentally and user-friendly.

[0020] The resin has an advantageous viscosity which allows it to be used in a paint composition.

[0021] Preferably, the resin according to the invention is obtained by polymerizing at least 51% by weight of linseed oil with a compound of vegetable origin selected from the group including rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and mixtures thereof.

[0022] According to a more preferred embodiment, the resin according to the invention is obtained by the polymerization of at least 51% by weight of linseed oil with a compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and mixtures thereof, and is characterized in that it has a kinematic viscosity at 40 °C of between 1500 and 15,000 mm³ 2 / s, preferably between 1500 and 10,000 mm 2 / s, more preferably between 1500 and 8000 mm 2 / s, more preferably between 1500 and 7000 mm 2 / s, determined according to ASTM D445-06.

[0023] Thus, the resin according to the invention makes it possible to provide a paint which has the desired properties in terms of drying time, opacity, penetrability, viscosity, whiteness (little yellowing).

[0024] Advantageously, the resin according to the invention makes it possible to provide a paint which has increased adhesion which allows it to stay in place better once applied.

[0025] Even more advantageously, the resin according to the invention makes it possible to provide a paint that forms a continuous and uniform coating with the appropriate thickness.

[0026] Furthermore, it has been observed that the resin according to the invention exhibits a pasteurized character, which enhances its antibacterial properties. This antibacterial character eliminates the need for, and therefore the presence of, substances and / or preservatives responsible for endocrine disruption.

[0027] The resin provided according to the invention is pasteurized, making it an excellent base for manufacturing compositions intended for use in construction, particularly in the field of paints. This is advantageous for both the environment and the user exposed to the resin according to the invention.

[0028] Preferably, the resin according to the invention is 100% of plant origin. The resin according to the invention preferably comprises 100% plant-based compounds.

[0029] Surprisingly, it has been found that the resin is self-sufficient, so that it is not necessary to add petroleum-based additives, especially when forming a paint composition.

[0030] Thus, the binder obtained by emulsifying the resin according to the invention is ready for use.

[0031] The emulsified resin according to the invention thus requires no further preparation, solubilization, or dissolution steps before use. Advantageously, the resin according to the invention is characterized by a biologically sourced carbon content of at least 95%, preferably up to 100%, as measured by the test , 4 Biogenic C according to standard EN 16 640 dated April 2017.

[0032] Preferably, the resin according to the invention is obtained by plasma polymerization, preferably by cold plasma.

[0033] Preferably, the resin according to the invention is obtained by irradiation polymerization, preferably by electron beams.

[0034] More preferably, the resin according to the invention is obtained by UV polymerization.

[0035] Advantageously, the resin according to the invention is substantially free of petroleum-based additives, that is, it contains less than 1% by weight of petroleum-based additives, preferably less than 0.01% by weight of petroleum-based additives, and more preferably less than 0.001% by weight of petroleum-based additives. Furthermore, the resin serves as a suitable base for the formation of a drying, opaque paint, while ensuring whiteness over time. This solves the problem of yellowing of currently used compounds, particularly when vegetable materials are used.

[0036] Surprisingly, the resin according to the invention not only eliminates the major use of petroleum-based binders (petroleum-based additives) but also significantly reduces the titanium dioxide content in a paint composition, which is particularly surprising.

[0037] Preferably, the resin according to the invention can be obtained by cold plasma polymerization comprising the following steps:

[0038] - To provide a plasma treatment chamber comprising a series of electrodes, preferably at least 5 electrodes being parallel to each other, for generating a plasma in a vacuum atmosphere, said plasma being arranged to be generated by electrical discharge, preferably DBD, in the presence of a plasmagen selected from the group comprising argon, helium, nitrogen, oxygen, air, hydrogen and mixtures thereof,

[0039] - Mix at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination,

[0040] - Introduce said mixture into said chamber and generate a plasma in the presence of said plasma generator until a kinematic viscosity at 40°C of between 1500 and 15,000 mm is reached 2 / s, preferably between 1500 and 10,000 mm 2 / s, more preferably between 1500 and 8000 mm 2 / s, more preferably between 1500 and 7000 mm 2 / s, determined according to ASTM D445-06 with formation of said resin. In the context of the present invention, it has been found that the application of a cold plasma polymerization to a mixture comprising at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and combinations thereof, makes it possible to provide a particularly advantageous resin, especially when used to manufacture a paint composition.

[0041] Preferably, said mixture consists of more than 80% by weight of said linseed oil and less than 20% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination.

[0042] Advantageously, said mixture consists of more than 95% by weight of said linseed oil and less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination.

[0043] According to a preferred method, at least 95% by weight, preferably at least 98% by weight of said linseed oil are mixed with less than 1% by weight, preferably less than 0.6% by weight of said compound of vegetable origin, preferably rosin.

[0044] Preferably, the said compound of plant origin is rosin.

[0045] The invention also relates to a method for manufacturing the resin according to the invention, with the following steps:

[0046] - To provide a plasma treatment chamber comprising a series of electrodes, preferably at least 5 electrodes being parallel to each other, for generating a plasma in a vacuum atmosphere, said plasma being arranged to be generated by electrical discharge, preferably DBD, in the presence of a plasmagen selected from the group comprising argon, helium, nitrogen, oxygen, air, hydrogen and mixtures thereof,

[0047] - Mix at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination,

[0048] - Introduce said mixture into said chamber and generate a plasma in the presence of said plasma generator until a kinematic viscosity at 40°C of between 1500 and 15,000 mm is reached 2 / s, preferably between 1500 and 10,000 mm 2 / s, more preferably between 1500 and 8000 mm 2 / s, more preferably between 1500 and 7000 mm 2 / s, determined according to ASTM D445-06 with formation of said resin.

[0049] It has been found that the application of a cold plasma polymerization to a mixture comprising at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and combinations thereof, provides a particularly advantageous resin, especially when used to manufacture a paint composition.

[0050] Preferably, the mixture consists of more than 80% by weight of linseed oil and less than 20% by weight of the plant-based compound selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin, and combinations thereof. Advantageously, the mixture consists of more than 95% by weight of linseed oil and less than 5% by weight of the plant-based compound selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin, and combinations thereof.

[0051] According to a preferred method, at least 95% by weight, preferably at least 98% by weight of said linseed oil are mixed with less than 1% by weight, preferably less than 0.6% by weight of said compound of vegetable origin, preferably rosin.

[0052] Preferably, the said compound of plant origin is rosin.

[0053] The invention also relates to a bio-based paint comprising the resin according to the invention and further containing less than 30% by weight of titanium dioxide, preferably less than 20% by weight, more preferably less than 15% by weight, more preferably still less than 10% by weight, advantageously less than 5% by weight of titanium dioxide relative to the total weight of said paint or being substantially free of titanium dioxide.

[0054] Advantageously, the substantial absence of titanium dioxide in the bio-based paint comprising the resin according to the invention makes it possible to minimize health and environmental risks by reducing population exposure and pollution of aquatic and terrestrial environments.

[0055] Even more advantageously, the substantial absence of titanium dioxide in the bio-based paint comprising the resin according to the invention allows for better biodegradability of the paint.

[0056] Preferably, the paint according to the invention is characterized by a touch drying time of between 20 minutes and 10 hours, preferably between 20 minutes and 7 hours, more preferably between 20 minutes and 6 hours, or a core drying time of less than 48 hours, preferably less than 36 hours, more preferably less than 24 hours, determined according to ASTM D5895.

[0057] More preferably, the paint according to the invention has a density between 0.5 and 3 g / cm³ 3 , preferably between 0.5 and 2 g / cm³ 3 , more preferably between 0.5 and 1.5 g / cm² 3 , possibly measured with the Gay-Lussac pycnometer according to ISO 281 1 standard at 20 °C.

[0058] According to a preferred mode, the paint according to the invention comprises less than 15% by weight of additives from the petrochemical sector, preferably less than 10% by weight, more preferably less than 5% by weight, relative to the total weight of paint.

[0059] More preferably, the paint according to the present invention comprises at least one of the elements included in the group comprising, possibly in powder form, eggshell, cellulose, talc, (mineral) fillers, etc.

[0060] The invention also relates to a product comprising the resin according to the invention.

[0061] Preferably, the product comprising the resin according to the invention can be paint, varnish, glue or sealant.

[0062] The present invention also relates to a use of the resin according to the invention in the field of construction, more particularly as a component of sealants, adhesives, wallpaper, ...

[0063] The term 'paint' or 'paint composition' as used in the present invention refers to a material which may include at least the resin according to the invention and optionally the following elements: pigment, solvent, bio-based additives, surfactant (bio-based).

[0064] The expression 'substantially free of titanium dioxide' means that the paint according to the invention may comprise less than 1% by weight of titanium dioxide, preferably less than 0.5% by weight of titanium dioxide, more preferably less than 0.05% by weight of titanium dioxide, expressed in relation to the total weight of the paint.

[0065] The terms "plant origin," "biogenic origin," or "biological origin" mean that the organic matter comes from an organism that was once living. More precisely, the source is biological matter that still contains detectable carbon-14, stored primarily by plants that absorbed it during the process of photosynthesis.

[0066] In comparison, the term "petro-sourced" refers to a material derived from fossils resulting from the decomposition of ancient organisms that no longer contains detectable carbon 1 as a result of its disintegration during the fossilization process.

[0067] The term 'petroleum-based additive' or 'additive derived from the petrochemical industry' refers to additives that influence certain properties (such as durability, UV resistance, moisture resistance, and drying time) of paint or resin intended for use in construction, particularly in the field of paints. These additives may include drying agents, antifoaming agents, UV stabilizers, thickening agents, and dispersing agents. Within the scope of the present invention, any additive of this type or equivalent derived from the petrochemical industry is undesirable, or even to be excluded from the invention. Indeed, the paint or resin according to the invention performs well without the use of these petroleum-based additives or in a quantity of less than 1% by weight relative to the total weight of the paint or resin.

[0068] The percentages expressed within the framework of the present invention are expressed by weight and in relation to the total weight of the composition concerned unless otherwise stipulated.

[0069] Kinematic viscosity is a physical property that describes a fluid's resistance to flow, particularly under the influence of gravity. The kinematic viscosity used in the context of this invention is preferably determined according to ASTM D445-06 and at a temperature of 40 °C, unless otherwise specified. More preferably, standards NF EN ISO 2884-1 and 2884-2 are also suitable. ASTM D445-06 is the standard published in May 2006.

[0070] The drying time expressed in the context of the present invention refers to the time required for a product or material applied to a surface, here the paint, to reach a sufficient degree of drying and can be determined by the ASTM D5895 standard. The latter is the one published in June 2020.

[0071] The 98% opacity achieved in the context of the present invention can be defined according to standard NF T30-075, which determines the hiding power of liquid paints. The standard in question is that of November 2017.

[0072] The Class 1 hardness defined in the context of this invention can be determined according to standard NF EN ISO 1522 and allows for the measurement of resistance to micro-scratches, marks, or indentations caused by small forces. The standard corresponds to the November 2022 version.

[0073] The whiteness expressed within the framework of the present invention can be determined according to the standard FD X08-014 of May 2012.

[0074] The glass transition temperature Tg expressed in the context of the present invention can be determined by differential scanning calorimetry (DSC) analysis preferably according to the standard NF EN ISO 16805 of October 2003.

[0075] Density (g / cm³) 3 ) expressed within the framework of the invention can be measured with a Gay-Lussac pycnometer according to ISO 281 1 at 20 °C of 2016 or 2023.

[0076] The carbon content of biological origin is measured by the test 14 Biogenic C according to standard EN 16 640 dated April 2017.

[0077] The invention provides a resin of vegetable origin which advantageously consists of at least 95% by weight, preferably at least 98% by weight, more preferably at least 99% by weight, of linseed oil and a maximum of 5% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, more preferably still less than 1% by weight of rosin. Said percentages being expressed as a percentage of the total weight of said resin.

[0078] The resin according to the invention is then treated by cold plasma and, after plasma treatment, exhibits a kinematic viscosity at 40 °C of between 1500 and 15,000 mm 2 / s, preferably between 1500 and 10,000 mm 2 / s, more preferably between 1500 and 8000 mm 2 / s, more preferably between 1500 and 7000 mm 2 / s, determined according to ASTM D445-06.

[0079] Alternatively, the resin according to the invention is polymerized instead of applying a cold plasma treatment.

[0080] The plasma-treated resin of the present invention is advantageous in that it can serve as a (main) binder in the manufacture of a paint.

[0081] This makes it possible to avoid a series of petroleum-based compounds.

[0082] Preferably, the resin can be emulsified using an aqueous medium or water, a fact that falls within the general knowledge of a skilled professional. The emulsion can be stable and used to manufacture paint.

[0083] Advantageously, the emulsion has a density between 0.5 and 200 g / cm³ 3 , preferably between 0.5 and 150 g / cm³ 3 , more preferably between 0.5 and 80 g / cm³ 3 advantageously between 0.5 and 30 g / cm³ 3 , more advantageously between 0.5 and 10 g / m 3, possibly measured with the Gay-Lussac pycnometer according to ISO 281 1 standard at 20 °C.

[0084] A paint according to the invention may comprise between 5 and 40% by weight of water, preferably between 5 and 30% by weight, more preferably between 10 and 25% by weight, relative to the total weight of the paint. A paint according to the invention may comprise between 0.1 and 2% by weight of additives, preferably bio-based, such as thickeners, anti-foaming agents, and dispersing agents, relative to the total weight of the paint.

[0085] A paint according to the invention may comprise between 5 and 50% by weight, preferably between 5 and 30% by weight, of (mineral) fillers such as calcium carbonate.

[0086] A paint according to the invention may comprise between 5 and 30% by weight, preferably between 5 and 20% by weight of eggshell.

[0087] A paint according to the invention may comprise between 5 and 30% by weight of calcium sulfate or equivalent.

[0088] Thanks to the use of the resin according to the invention, it is possible to provide a paint with a significantly reduced, or even non-existent, titanium dioxide content compared to a paint available on the market, while still benefiting from effective properties in terms of drying time, opacity, durability and maintenance of whiteness over time.

[0089] The paint according to the invention is thus substantially free of titanium dioxide, which means that the paint according to the invention may comprise less than 1% by weight of titanium dioxide, preferably less than 0.5% by weight of titanium dioxide, more preferably less than 0.05% by weight of titanium dioxide, expressed in relation to the total weight of the paint.

[0090] The paint according to the invention can thus be applied to all types of substrates, preferably those chosen from the group including plaster, coating, wood, plastic, metal, textile, ceramic, composite, resin, laminate, paper, cardboard, cement, brick and their combination.

[0091] Plasma is a cold plasma treated in a chamber containing a series of electrodes, preferably at least five electrodes arranged in parallel. The plasma is generated in a vacuum atmosphere, preferably by electrical discharge, for example, dielectric discharge. The plasma generator can be selected from the group including argon, helium, nitrogen, oxygen, air, hydrogen, and mixtures thereof.

[0092] Preferably, the plasma is implemented in such a way as to achieve a temperature between 10-100 °C, preferably between 40 and 100 °C within the enclosure.

[0093] Vacuuming is preferably carried out by applying a vacuum in the chamber of less than 1 mbar with a working pressure in said chamber between 50 and 250 mbar, preferably between 150 and 250 mbar.

[0094] The plasma is ignited by using a power source capable of providing a voltage which, when applied to the electrodes, is determined by applying Paschen's law.

[0095] Example 1 - resin

[0096] A mixture is prepared by adding 99.5% by weight of linseed oil and 0.5% by weight of rosin. This mixture is introduced into a plasma treatment chamber containing at least five parallel electrodes. A plasma is generated in a vacuum atmosphere until a vacuum of less than 1 mbar is reached, with a working pressure then established within the chamber at 200 mbar and a temperature of 70°C. This is achieved by DBD electrical discharge in the presence of a plasma generator selected from a group including argon, helium, nitrogen, oxygen, air, hydrogen, and mixtures thereof. This allows for plasma polymerization, which brings the mixture to a kinematic viscosity of approximately 6300 mm³. 2 / s measured at 40°C. The resin thus obtained can be used as a binder for a paint composition.

[0097] The supplied resin is pasteurized, making it an excellent base for manufacturing compositions intended for use in construction, particularly in the field of paint. Example 2 - Paint

[0098] The resin in Example 1 is mixed with a thickener, an anti-foaming agent, a dispersing agent, precipitated calcium carbonate, eggshell and calcium sulfate to form a vegetable and ecological paint that is substantially free of titanium dioxide.

[0099] The drying time of this paint on plaster is less than 30 minutes to the touch (on the surface) and less than 24 hours to the core.

[0100] No yellowing appears after 1 month of application.

[0101] Comparative example

[0102] A mixture is prepared by adding 40% by weight of linseed oil and 60% by weight of rosin. This mixture is introduced into a plasma treatment chamber containing at least five parallel electrodes. A plasma is generated in a vacuum atmosphere by DBD electrical discharge in the presence of a plasma generator. Plasma polymerization results in a product with an unsuitable viscosity. This makes it unsuitable for paint manufacturing.

[0103] The articles "a" and "an" are used here to refer to one or more of one (i.e., at least one) of the grammatical objects of the article and can be replaced by an article that denotes a plural such as "at least 2", "at least 3", "several", etc.

[0104] The expressions "in an embodiment," "according to an embodiment," and similar expressions generally mean that the particular feature, structure, or characteristic referred to in the expression is included in at least one embodiment of this disclosure and may be included in more than one embodiment of this disclosure. It is important to note that such expressions do not necessarily refer to the same embodiment. If the text indicates that a component or feature "may" or "could" be included or have a characteristic, it is not necessary that this particular component or feature actually be included or have the characteristic.

[0105] If it appears here, the term "comprising" or "containing" and derivatives thereof are not intended to exclude the presence of any additional component, step, or procedure, whether or not disclosed herein. For the avoidance of doubt, the term "comprising" may include any additional element / additive, adjuvant, or compound unless otherwise specified. By contrast, the term "essentially consisting of," if it appears here, excludes from the scope of any subsequent quotation any other component, step, or procedure, except those not essential to operability, and the term "consisting of," if used, excludes any component, step, or procedure not specifically defined or indicated. The terms "or" and "and / or," unless otherwise specified, refer to the members indicated individually as well as in any combination. For example, the expression A and / or B refers to A alone, B alone, or A and B.Furthermore, the term and any equivalent to "comprising" can be replaced by "consisting of".

[0106] Also, the terms "obtainable" or "can be obtained" or any similar or derived expression may be replaced by "directly obtained".

[0107] It is understood that the present invention is in no way limited to the embodiments described above and that many modifications can be made to it without departing from the scope of the attached claims.

Claims

DEMANDS 1. A resin of vegetable origin for providing a paint, said resin comprising at least 51% by weight of linseed oil and a compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and mixtures thereof, characterized in that said resin has a kinematic viscosity at 40 °C of between 1500 and 15,000 mm³ 2 / s, preferably between 1500 and 10,000 mm 2 / s, more preferably between 1500 and 8000 mm 2 / s, more preferably between 1500 and 7000 mm 2 / s, determined according to ASTM D445-06.

2. Resin according to claim 1, characterized by a carbon content of biological origin of at least 95%, preferably up to 100% as measured by the test 14 Biogenic C according to standard EN 16 640 dated April 2017.

3. Resin according to claim 1 or 2, being obtained by plasma polymerization, preferably by cold plasma.

4. Resin according to any one of the preceding claims, being obtained by cold plasma polymerization comprising the following steps: Provide a plasma treatment chamber comprising a series of electrodes, preferably at least 5 electrodes being parallel to each other, for generating a plasma in a vacuum atmosphere, said plasma being arranged to be generated by electrical discharge, preferably DBD, in the presence of a plasmagen selected from the group comprising argon, helium, nitrogen, oxygen, air, hydrogen and mixtures thereof, Mix at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group including rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combinations, Introduce said mixture into said chamber and generate a plasma in the presence of said plasma generator until a kinematic viscosity at 40°C of between 1500 and 15,000 mm is reached. 2 / s, preferably between 1500 and 10,000 mm 2 / s, more preferably between 1500 and 8000 mm 2 / s, more preferably between 1500 and 7000 mm 2 / s, determined according to ASTM D445-06 with formation of said resin.

5. Resin according to any one of the preceding claims, wherein at least 95% by weight, preferably at least 98% by weight of said linseed oil are mixed with less than 1% by weight, preferably less than 0.6% by weight of said compound of vegetable origin, preferably rosin.

6. A bio-based paint comprising the resin according to any one of the preceding claims and further containing less than 30% by weight of titanium dioxide, preferably less than 20% by weight, more preferably less than 15% by weight, more preferably still less than 10% by weight, advantageously less than 5% by weight of titanium dioxide relative to the total weight of said paint or being substantially free of titanium dioxide.

7. Paint according to claim 6, characterized by a touch drying time of between 20 minutes and 10 hours, preferably between 20 minutes and 7 hours, more preferably between 20 minutes and 6 hours or a core drying time of less than 48 hours, preferably less than 36 hours, more preferably less than 24 hours, which can be determined by ASTM D5895.

8. Paint according to claim 6 or 7 with a density between 0.5 and 3 g / cm³ 3 , preferably between 0.5 and 2 g / cm³ 3 , more preferably between 0.5 and 1.5 g / cm² 3 .

9. Paint according to any one of claims 6 to 8, comprising less than 15% by weight of additives derived from the petrochemical sector, preferably less than 10% by weight, more preferably less than 5% by weight, relative to the total weight of paint.

10. Product comprising the resin according to any one of claims 1 to 5. 1 1. Use of the resin according to any one of claims 1 to 5 in the field of construction, more particularly as a component of sealants, glues, wallpaper.