Road marking components

Abstract

To provide a road marking composition capable of reducing dependence on petroleum.SOLUTION: A road marking composition contains a binding material, a plasticizer, an extender material, a pigment, and glass beads, and is applied by being melted. The road marker composition contains at least one of a terpene resin, a rosin resin, a lactic acid resin and derivatives thereof in the binding material, and contains vegetable oil and / or vegetable oil derivatives in the plasticizer, and can reduce dependence on petroleum.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technical field of the present specification relates to a road marking composition that is applied to road surfaces such as roads, runways, and parking areas to form road markings that clearly indicate the paths of vehicles, aircraft, and pedestrians, as well as stop lines. [Background technology]

[0002] Patent Document 1 describes a road marking composition that contains a thermoplastic binder, an extender, a plasticizer, and glass beads and that is applied to road surfaces to form road markings that clearly indicate the path of vehicles, stop lines, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-326993 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the road marking composition described in Patent Document 1 uses a petroleum-derived binder as the thermoplastic binder, which means that it is highly dependent on petroleum and there is a risk that it may become unusable in the future.

[0005] The problem to be solved by the technology of this specification has been achieved in view of the above points, and an object of the invention is to provide a road marking composition that can reduce dependency on petroleum. [Means for solving the problem]

[0006] A road marking composition according to an embodiment of the present specification is a road marking composition that contains a binder, a plasticizer, an extender, a pigment, and glass beads, and is applied by melting, The binder contains at least one of a terpene resin, a rosin resin, a lactic acid resin, or a derivative thereof, The plasticizer is characterized by containing a vegetable oil and / or a vegetable oil derivative.

[0007] According to the road marking composition according to the embodiment of the present specification, the binder contains at least one of terpene resin, rosin resin, lactic acid resin, or derivatives thereof, which are non-petroleum-derived biological resins, and the plasticizer contains vegetable oil and / or vegetable oil derivatives, thereby reducing dependency on petroleum.

[0008] Here, in the above road marking composition, the binder may contain at least one of a terpene resin, a rosin resin, or a derivative thereof.

[0009] This allows the road marking formed from the road marking composition to have improved oil resistance.

[0010] In the above road marking composition, the plasticizer may contain the vegetable oil derivative, and the vegetable oil derivative may be an epoxidized vegetable oil and / or a vegetable oil-modified alkyd.

[0011] According to this, the road marking composition can have an improved shelf life because the epoxidized vegetable oil or vegetable oil-modified alkyd is inhibited from oxidation.

[0012] The road marking composition may also contain a plant-based wax and / or an animal-based wax.

[0013] This allows the road markings formed from the road marking composition to have improved stain resistance. [Effects of the Invention]

[0014] Pavement marking compositions according to embodiments herein can reduce dependency on petroleum. [Brief explanation of the drawings]

[0015] [Figure 1] 1A is a cross-sectional view of a model showing application of a road marking composition according to an embodiment of the present specification, and FIG. 1B is a perspective view of the model. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a description will be given of a road marking composition according to an embodiment of the present specification. Note that the scope of the present invention is not limited to the scope disclosed in the embodiment. The road marking composition according to the embodiment is a powder paint that is melted and applied and is one of three types (No. 1, No. 2, and No. 3) specified in road marking paint (JIS K 5665:2018). Note that the difference between No. 1, No. 2, and No. 3 is the content of glass beads in the paint.

[0017] In this specification, when expressing the compounding amount or compounding ratio of the road marking composition, unless otherwise specified, it is expressed in mass units and in the state of a powder paint containing volatile components. Furthermore, unless otherwise specified, the "%" indicating the compounding unit means "% by mass."

[0018] The glass transition temperature (Tg) (°C) was measured by dynamic viscoelasticity. The paint viscosity (dPas) was measured at 200°C by placing a composition sample, prepared by melting the paint composition at 230°C, in a dedicated container (depth: 120 mm, diameter: 80 mm) kept at 230°C or higher, to about 80%, immersing the rotor of a viscometer (Viscotester "VT-04F", manufactured by Rion Co., Ltd.), and allowing the sample to cool naturally to 200°C while stirring.

[0019] The road marking composition according to the embodiment contains raw materials such as binders, plasticizers, fillers, pigments, and glass beads, and is melted to give it fluidity with an appropriate viscosity before application to the road surface.

[0020] The binder is a resin that binds these raw materials together and adheres them to the road surface to be coated. When applied to a road surface and used as a road marking, the road marking composition must be resistant to peeling from the road surface, i.e., have high adhesion, and must also be resistant to wear even when repeatedly run over by vehicle tires, i.e., be highly durable. For this reason, petroleum-derived synthetic resins, which have excellent adhesion and durability, have been used as binders. It has been discovered that a road marking composition according to an embodiment contains at least one of a biologically derived (biomass-derived) terpene resin, a rosin resin, a lactic acid resin, or a derivative thereof as the binder, and a biologically derived vegetable oil and / or vegetable oil derivative as the plasticizer, thereby reducing dependence on petroleum and providing excellent adhesion and durability. It has also been discovered that a road marking formed from a road marking composition containing at least one of a terpene resin, a rosin resin, or a derivative thereof as the binder can enhance oil resistance.

[0021] Terpene resins are oligomers and polymers obtained by polymerizing raw materials containing terpene monomers. Terpenes are biological substances produced in the bodies of plants or animals, and can be extracted mainly from the sap of the Pinaceae family and the fruits of the Rutaceae family. Terpenes are generally polymers of isoprene (C5H8), and include monoterpenes (C 10 H 16 ), sesquiterpenes (C 15 H 24 ), diterpenes (C 20 H 32Monomers with these basic skeletons are terpene monomers, such as α-pinene, β-pinene, dipentene, limonene, myrcene, alloocimene, ocimene, α-phellandrein, α-terpinene, γ-terpinene, terpinolene, 1,8-cineole, 1,4-cineole, α-terpineol, β-terpineol, γ-terpineol, sabinene, paramentadienes, and carenes. Terpene derivatives also include those containing other monomers copolymerizable with terpene monomers, such as coumarone monomers such as benzofuran (CHO); vinyl aromatic compounds such as styrene, α-methylstyrene, vinyltoluene, divinyltoluene, and 2-phenyl-2-butene; and phenolic monomers such as phenol, cresol, xylenol, propylphenol, norylphenol, hydroquinone, resorcinol, methoxyphenol, bromophenol, bisphenol A, and bisphenol F.

[0022] Commercially available terpene resins can also be used, including terpene resins, aromatic modified terpene resins, terpene phenol resins (manufactured by Yasuhara Chemical Co., Ltd.), and the Tamanol series (manufactured by Arakawa Chemical Industries, Ltd.).

[0023] Rosin resin is an oligomer or polymer obtained by polymerizing raw materials containing rosin acid. Rosin acid is a biological substance produced within plants and can be extracted primarily from the sap of the Pinaceae family. Rosin acids include, for example, abietic acid, neoabietic acid, dehydroabietic acid, palustric acid, pimaric acid, isopimaric acid, sandaracopimaric acid, levopimaric acid, and dehydroabietic acid. Rosin acid can be modified and polymerized to produce rosin resin, and examples of rosin resins that can be used include rosin esters, rosin-modified phenolic resins, rosin-modified maleic acid resins, and polymerized rosin resins.

[0024] Commercially available rosin resins can also be used, and examples of commercially available products that can be used include rosin resins, rosin derivatives (rosin esters, rosin phenols, disproportionated rosin esters) (manufactured by Arakawa Chemical Industries, Ltd.), rosin resins, rosin derivatives (rosin esters, rosin phenols, disproportionated rosin esters) (manufactured by Harima Chemical Group Co., Ltd.), the Tamanol series (manufactured by Arakawa Chemical Industries, Ltd.), and the OR series (manufactured by Seiko PMC Corporation).

[0025] Lactic acid resin is a resin polymerized by ester bonds, with L-lactic acid and / or D-lactic acid as the main constituent. Lactic acid resin may contain other copolymerization components in addition to lactic acid, such as glycol compounds such as ethylene glycol, propylene glycol, butanediol, heptanediol, hexanediol, octanediol, nonanediol, decanediol, 1,4-cyclohexanedimethanol, neopentyl glycol, glycerin, pentaerythritol, bisphenol A, polyethylene glycol, polypropylene glycol, and polytetramethylene glycol, oxalic acid, adipic acid, sebacic acid, azelaic acid, dodecanedioic acid, malonic acid, glutaric acid, and cyclohexanedicarboxyl alcohol. Examples of suitable carboxylic acids include dicarboxylic acids such as carboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, bis(p-carboxyphenyl)methane, anthracene dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 5-sodium sulfoisophthalic acid, and 5-tetrabutylphosphonium isophthalic acid; hydroxycarboxylic acids such as glycolic acid, hydroxypropionic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, and hydroxybenzoic acid; and lactones such as caprolactone, valerolactone, propiolactone, undecalactone, and 1,5-oxepan-2-one.

[0026] Commercially available lactic acid resins can also be used, such as the REVODE series (manufactured by Kobe Seika Co., Ltd.), LaCrie FC series (manufactured by Fuji Chemical Co., Ltd.), Terramac (manufactured by Unitika Ltd.), and Biodegmar (manufactured by BMG Corporation).

[0027] Examples of petroleum-derived binders that have conventionally been used in road marking compositions include aliphatic petroleum resins, petroleum hydrocarbon resins such as polybutene, coumarone resins such as coumarone-indene resin, phenolic resins such as phenol-formaldehyde resin, aromatic hydrocarbon resins, unsaturated hydrocarbon polymers, isoprene resins, hydrogenated hydrocarbon resins, and hydrocarbon tackifying resins.

[0028] The binder content in the road marking composition can be 10 to 25% by mass. This is because excellent workability and a normal coating film (road marking) can be obtained. If the binder content in the road marking composition is less than 10% by mass, the viscosity at the application temperature (200°C) will be high, and good workability may not be obtained. On the other hand, if the content exceeds 25% by mass, the amount of binder will be excessive, which may be uneconomical. In addition, the road marking formed by applying the road marking composition to the road surface may have adhesive properties and may adhere to the tires of vehicles traveling on the road surface, causing the road marking to peel off from the road surface. In another embodiment, the binder content in the road marking composition can be 12 to 23% by mass, and in yet another embodiment, it can be 13 to 20% by mass.

[0029] A plasticizer is an organic material that imparts plasticity, such as flexibility and pliability, to a binder. By imparting plasticity, such as flexibility and pliability, to the binder of a road marking composition, the road marking composition can be applied to a road surface and used as a road marking, thereby preventing cracking and peeling of the road marking. The plasticizer penetrates into the resin of the binder, weakening the intermolecular forces of the resin and facilitating the movement of the resin chains, thereby lowering the resin's glass transition temperature (Tg) and imparting plasticity, such as flexibility and pliability, to the binder. Therefore, plasticizers are required to have good compatibility with resins and low volatility. For this reason, petroleum-derived synthetic resins, which have excellent properties, have traditionally been used as plasticizers. The road marking composition according to the embodiment was discovered to have good compatibility with resins and low volatility when the plasticizer is a vegetable oil and / or a vegetable oil derivative.

[0030] Vegetable oils that can be used in plasticizers include soybean oil, linseed oil, palm oil, tall oil (a by-product of pulp production), perilla oil, olive oil, grape oil, corn oil, coconut oil, sesame oil, rice oil, rapeseed oil, sunflower oil, safflower oil, cottonseed oil, peanut oil, etc. Among these, soybean oil, linseed oil, palm oil, and tall oil, which have excellent plasticity, can be used.

[0031] These vegetable oils used as plasticizers are prone to oxidation, so they can be epoxidized or alkyd-modified to form vegetable oil derivatives that are less susceptible to oxidation and can be used. Commercially available epoxidized or alkyd-modified vegetable oil derivatives that can be used as plasticizers include epoxidized soybean oil, epoxidized linseed oil (manufactured by New Japan Chemical Co., Ltd.), and vegetable oil-modified alkyd resin (manufactured by Arakawa Chemical Industries, Ltd.).

[0032] Conventionally, plasticizers used in road marking compositions that use petroleum-derived binders include, for example, mineral oil, epoxy-based, phthalic acid-based, adipic acid-based, and phosphoric acid-based plasticizers. Examples of mineral oils that have been used include naphthenic, paraffinic, and olefin-based plasticizers. These are petroleum-derived plasticizers.

[0033] The content of the plasticizer in the road marking composition can be 0.3 to 5% by mass. This is because it can impart plasticity, such as flexibility and pliability, to the coating film (road marking). If the content of the plasticizer in the road marking composition is less than 0.3% by mass, there is a risk that the coating film will not be imparted with sufficient plasticity. On the other hand, if the content of the plasticizer exceeds 5% by mass, the plasticizer may make the coating film more susceptible to contamination, resulting in poor stain resistance. In addition, the road marking formed by applying the road marking composition to the road surface may have adhesive properties that may adhere to the tires of vehicles traveling on the road surface, causing the road marking to peel off from the road surface. In another embodiment, the content of the plasticizer in the road marking composition can be 0.5 to 3% by mass, and in yet another embodiment, it can be 0.7 to 2.5% by mass.

[0034] The filler is a fine particle that reduces the amount of expensive binder used in the road marking composition and improves workability during application of the road marking composition by combining particle size distributions. Furthermore, the filler imparts strength and improves abrasion resistance when the road marking composition is applied and used as a road marking. Examples of fillers that can be used include calcium carbonate, silica sand, crushed stone powder, celbene (crushed sanitary ware), talc, clay, blast furnace slag, and barium sulfate.

[0035] The content of the filler in the road marking composition can be 5 to 75% by mass. This is because the road marking formed from the road marking composition can have a clean coating and can impart sufficient plasticity to the coating. If the content of the filler in the road marking composition is less than 5% by mass, the amount of binder will be relatively excessive, which may be uneconomical. In addition, the road marking formed by applying the road marking composition to the road surface may be adhesive and may adhere to the tires of vehicles traveling on the road surface, causing the road marking to peel off from the road surface. On the other hand, if the content exceeds 75% by mass, the amount of binder will be insufficient, which may make it impossible to impart plasticity such as flexibility and pliability to the coating. In another embodiment, the content of the filler in the road marking composition can be 10 to 70% by mass, and in yet another embodiment, it can be 15 to 65% by mass.

[0036] A pigment is a material that reflects light of a specific wavelength and is a raw material that imparts color and concealment to a road marking formed from the road marking composition. A general-purpose pigment can be used for the road marking composition depending on the color to be imparted. Examples of pigments that can be used include white, titanium oxide, zinc white, black, carbon black, red, red iron oxide, quinacridone, blue, cobalt blue, phthalocyanine blue, yellow, nickel titanium yellow, and monoazo yellow.

[0037] The pigment content in the road marking composition can be 0.5 to 15% by mass. This is because sufficient coloring power and hiding power can be imparted to the coating film (road marking) formed from the road marking composition. If the pigment content in the road marking composition is less than 0.5% by mass, not only may the coloring power and hiding power be insufficient, but the weather resistance of the coating film may also be poor. On the other hand, if the pigment content exceeds 15% by mass, there will be little difference in coloring power and hiding power, which may be uneconomical. In another embodiment, the pigment content in the road marking composition can be 1 to 10% by mass, and in yet another embodiment, it can be 1.5 to 5% by mass.

[0038] Glass beads are beads made of optically transparent glass, and when contained in a road marking formed from a road marking composition, they can provide a retroreflective effect for vehicle headlights and improve visibility from vehicles. The glass beads can be glass beads specified in Glass beads for road marking paints (JIS R 3301:2014) or glass beads equivalent thereto.

[0039] The glass bead content in the pavement marking composition can be 10 to 60% by mass. This is because a retroreflective effect can be obtained for the vehicle headlights, improving visibility from the vehicle. If the glass bead content in the pavement marking composition is less than 10% by mass, the retroreflective effect may not be sufficient. On the other hand, if it exceeds 60% by mass, the binder content may be insufficient, which may prevent the paint film from being imparted with plasticity such as flexibility and pliability. Furthermore, when the painted pavement marking wears, the exposed glass beads may cause the vehicle tires to become slippery. In another embodiment, the glass bead content in the pavement marking composition can be 15 to 55% by mass. Note that the three types of pavement marking paints (JIS K 5665:2018) stipulate that the glass bead content in the pavement marking composition is 15 to 18% by mass for No. 1, 20 to 23% by mass for No. 2, and 25% by mass or more for No. 3.

[0040] The road marking composition may contain other additives such as natural wax, anti-settling agents, antioxidants, ultraviolet absorbers, and fluidity-imparting agents, as appropriate.

[0041] Natural waxes are naturally occurring waxes that are added to a road marking composition and appear on the surface of an applied road marking made from the road marking composition, thereby inhibiting the adhesion of dirt to the surface of the road marking. Examples of natural waxes that can be used include animal waxes such as beeswax, mink oil, adsorption-refined lanolin, and spermaceti, plant waxes such as carnauba wax, candelilla wax, rice wax, Japan wax, and jojoba wax, and plant-derived biopolyethylene wax made from ethanol produced from raw materials such as sugar cane.

[0042] The content of natural wax in the pavement marking composition can be 0.1 to 5% by mass. This is because adhesion of dirt to the surface of the pavement marking can be suitably inhibited. If the content of natural wax in the pavement marking composition is less than 0.1% by mass, adhesion of dirt to the surface of the pavement marking may not be suitably inhibited. On the other hand, if the content exceeds 5% by mass, there is little difference in the effect of inhibiting adhesion of dirt, and this may be uneconomical. In another embodiment, the content of the antifouling agent can be 0.2 to 2.5% by mass, and in yet another embodiment, it can be 0.3 to 2.0% by mass.

[0043] The road marking composition of the embodiment can be prepared by mixing these raw materials in amounts that correspond to the content ratio. As the mixer, a general-purpose mixer such as a paddle mixer, a Nauta mixer, a ribbon mixer, a conical screw mixer, or a Henschel mixer can be used.

[0044] Next, a method for applying the road marking composition will be described. Any general-purpose melt coating machine (slitter) can be used to apply the road marking composition, and for example, melt coating machine 29 shown in Figure 1 can be used.

[0045] The melt coating machine 29 shown in Figure 1 has a paint supply port 35, which has a horizontal shutter 37 that moves horizontally and has a base horizontal section connected by an inclined section between the base horizontal section and the front horizontal section. The horizontal shutter 37 moves forward to bring the front horizontal section into contact with the applicator 33 (position shown by the two-dot chain line), thereby closing the paint supply port 35. The paint filling container 31 is equipped with heating means (e.g., a gas burner, electric heater, etc.) that can keep the paint warm and melt it.

[0046] The heating temperature of the paint (set temperature for heat retention) is set appropriately within the range of a temperature higher than the temperature at which the paint melts (for example, a temperature of 180 to 220°C for paint with a softening point of 110°C) to prevent the paint from solidifying during application. The melting paint applicator 29 is used with a gap (slit) s between the applicator 33 and the road surface R. The gap s at this time is set to the same as the set film thickness (usually 1 to 3 mm). In this way, the road marking is formed on the road surface R. [Example]

[0047] The road marking compositions of the embodiments having different compositions were subjected to the quality tests described below and evaluated.

[0048] Density (23℃) (g / cm 3 ) The density was measured in accordance with JIS K 5665:2018 (Pavement marking paint) 8.6 Density. The density was 2.0 to 2.3 g / cm. 3 2.0 g / cm 3 Less than or equal to 2.3 g / cm 3 Those exceeding this were evaluated as ×.

[0049] Softening point (℃) The softening point was measured in accordance with JIS K 5665:2018 (Pavement marking paint) 8.9 Softening point, and was evaluated as follows: a softening point of 80 to 120°C is ◯, a softening point of more than 120°C but not more than 200°C is △, and a softening point of less than 80°C or more than 200°C is ×.

[0050] Diffuse reflectance (%) The diffuse reflectance was measured in accordance with JIS K 5665:2018 (Pavement marking paint) 8.15 Diffuse reflectance, and was evaluated as ◯ when the diffuse reflectance was 75% or more, and × when it was less than 75%.

[0051] yellowness The yellowness was measured in accordance with JIS K 5665:2018 (Paints for road markings) 8.17 Yellowness, and was evaluated as ◯ when the yellowness was 0 to 0.10, and × when it was over 0.10.

[0052] Compressive strength (23℃) (kN / cm 2 ) The compressive strength was measured in accordance with JIS K 5665:2018 (Pavement Marking Paints) 8.19 Compressive Strength. The compressive strength was 0.802 kN / cm 2 Those with a value of 0.802 kN / cm or more are marked with a circle. 2 If the value was less than this, it was evaluated as x.

[0053] Outdoor exposure weather resistance The outdoor exposure weather resistance was measured in accordance with JIS K 5665:2018 (Pavement Marking Paints) 8.26 Outdoor Exposure Weather Resistance. The outdoor exposure weather resistance was evaluated as follows: ○: no significant cracking, peeling, or color change after 12 months; △: no significant cracking, peeling, or color change after 6 months, but significant cracking, peeling, or color change after 12 months; ×: significant cracking, peeling, or color change after 6 months.

[0054] oil dependence The degree of petroleum dependency was evaluated as follows: ○: a pavement marking composition with a petroleum-derived raw material content of less than 1% by mass; △: a pavement marking composition with a petroleum-derived raw material content of 1 to 10% by mass; and ×: a pavement marking composition with a petroleum-derived raw material content of more than 10% by mass.

[0055] Details of the raw materials used in the examples are given below.

[0056] Terpene resin A...Terpene resin (YS resin) Terpene resin B: Aromatic modified terpene resin Rosin resin A: Rosin derivative A Rosin resin B: Rosin derivative B Lactic acid resin...Lactic acid resin Aliphatic petroleum resin…C5 petroleum resin Plasticizer A: Epoxidized soybean oil Plasticizer B: Vegetable oil modified alkyd Plasticizer C: Phthalate-based plasticizer Titanium dioxide: Anatase-type titanium dioxide (average particle size (median diameter d50): 0.25 μm) Calcium carbonate: A 50 / 50 mixture of heavy calcium carbonate (average particle size: 20 μm) and granular marble (particle size: 0.1 to 0.5 mm) Glass beads: Glass beads for road marking paint (JIS R 3301:2014 compliant) Natural wax A: Plant-based wax Natural wax B: Bio-polyethylene wax Natural wax C: Animal wax Other additives: anti-settling agents, antioxidants, UV absorbers, etc. All of these are commercially available products. Note that the aliphatic petroleum resin, plasticizer C, and some of the other additives are petroleum-derived raw materials.

[0057] Test examples of road marking compositions are shown in Tables 1 to 3. Test examples 1 to 5 and 7 to 14 are working examples, and test example 6 is a comparative example. In the tables, petroleum-derived raw materials are marked with *.

[0058] [Table 1]

[0059] [Table 2]

[0060] [Table 3] (Test Examples 1 to 6) Test Examples 1 to 6 are test examples in which the type of binder and the type of plasticizer were changed. Test Example 1 used terpene resin A as the binder and epoxidized soybean oil as the plasticizer. Test Example 1 was evaluated as having a density of 2.0 to 2.3 g / cm 3 The softening point is in the range of 80 to 120°C, the diffuse reflectance is 75% or more, the yellowness is in the range of 0 to 0.10, and the compressive strength is 0.802 kN / cm 2 As a result, the outdoor exposure weather resistance was evaluated as excellent, with no significant cracking, peeling, or color change after 12 months. Furthermore, the content of petroleum-derived raw materials in the road marking composition of Test Example 1 was less than 1% by mass, which reduced dependency on petroleum.

[0061] Test Example 2 used terpene resin B as the binder and vegetable oil-modified alkyd as the plasticizer. Test Example 3 used rosin derivative A as the binder and vegetable oil-modified alkyd as the plasticizer. Test Example 4 used rosin derivative B as the binder and epoxidized soybean oil as the plasticizer. Test Examples 2 to 4 were evaluated as excellent as Test Example 1, and were able to reduce dependence on petroleum.

[0062] Test Example 5 used lactic acid resin as the binder and epoxidized soybean oil as the plasticizer. Test Example 5 was evaluated for outdoor exposure weather resistance, with no significant cracking, peeling, or color change after 6 months, but significant cracking, peeling, and color change after 12 months, indicating poor weather resistance. This is presumably due to the poor water resistance of the lactic acid resin. Test Example 5 was otherwise excellent, similar to Test Example 1, and was able to reduce dependence on petroleum.

[0063] Test Example 6 used a petroleum-derived C5 petroleum resin as the binder and a petroleum-derived paraffin-based plasticizer as the plasticizer. Test Example 6 was evaluated as excellent as Test Example 1, but because it was a conventional petroleum-derived road marking composition, it was highly dependent on petroleum.

[0064] (Test Examples 7 to 11) Test Examples 7 to 11 are test examples in which a terpene resin and a rosin ester resin were used alone or in combination as the binder, and natural wax was also added. Test Examples 7 to 11, in which a terpene resin and a rosin ester resin were used alone or in combination, were evaluated as excellent as Test Example 1, and were able to reduce dependence on petroleum. Although not included in the test items, Test Examples 7 to 11 showed less adhesion of dirt to the surface of the road markings than Test Example 1. It is presumed that the natural wax added to Test Examples 7 to 11 was exposed to the surface of the applied road markings made of the road marking composition, thereby suppressing the adhesion of dirt to the surface of the road markings.

[0065] (Test Examples 12 to 14) Test Examples 12 to 14 are test examples in which the conventional petroleum-derived binder C5 petroleum resin was replaced with a combination of terpene resin and rosin ester resin, and the purpose was to confirm whether it is possible to gradually replace conventional mainstream petroleum resins with bio-derived resins. The evaluation of Test Examples 12 to 14 was excellent, just like Test Example 1, and it was confirmed that gradual replacement with bio-derived resins is possible.

[0066] The road marking composition of the embodiment can be implemented even if its constitution is changed to the following form.

[0067] Although the road marking composition of the embodiment contains a binder, a plasticizer, an extender, a pigment, and glass beads, the road marking composition may contain a binder, a plasticizer, an extender, and a pigment but no glass beads. In this case, the required amount of glass beads is added when the road marking composition is melted, so that the content of glass beads in the road marking composition can be freely set.

[0068] The road marking composition of the embodiment is a road marking composition that is applied to a road surface to form road markings that clearly indicate the path of vehicles, stop lines, etc., but it is of course also possible to use the road marking composition to form colored road markings for the purpose of guiding the eye, etc. [Explanation of symbols]

[0069] 29 Melting paint machine 31 Paint filling container 33 Applicator 35 Paint supply port 37 Horizontal shutter R road surface s gap

Claims

1. A road marking composition containing a binder, a plasticizer, an extender, a pigment, and glass beads, which is melted and applied, The binder contains at least one of a terpene resin, a rosin resin, or a derivative thereof, the plasticizer comprises epoxidized soybean oil; The binder content is 10 to 25% by mass, and the plasticizer content is 0.3 to 2.5% by mass, A pavement marking composition comprising less than 1% by mass of petroleum-derived raw materials.

2. 2. The pavement marking composition according to claim 1, further comprising a vegetable wax and / or an animal wax.

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