JP2020000627A - Golf ball - Google Patents

Abstract

To provide a golf ball with a sense of luxury, in a matte golf ball without luster or gloss.SOLUTION: A golf ball includes at least one layer of a core and at least one layer of a coating film layer. At least one layer of the coating film layers contains a matte particle. Of the coating film layers, the same layer as or a different layer from the layer containing the matte particle contains a luminous material.SELECTED DRAWING: None

Description

  The present invention relates to a golf ball having at least one core and a coating layer (also referred to as a “coating layer”). More specifically, the present invention provides a matte appearance without gloss and a high-grade appearance. The present invention relates to a golf ball presented.

  Several techniques of golf balls having a unique appearance and a high-quality feel have been proposed. As one example, there is a golf ball having a coating layer in which a glitter material is mixed with a resin material in order to improve the appearance properties, which is described in JP-A-2006-214326. However, a golf ball having the above-mentioned coating layer has a serious problem in that it has a high-class feeling, but is scattered with a large amount of light and stimulates eyes during putting on a green to hinder concentration.

  Recently, a so-called matt golf ball, which is matte or glossless to the extent that the contour of dimples on the ball surface cannot be recognized, has been gaining popularity although it is a golf ball having a color appearance. Such a matte golf ball is a color golf ball with a novel coloring property, and although the dimples are not clearly visible, the player's ability to concentrate on the ball when impacting a driver shot or approaching the ball is improved. It is said that there is also a psychological effect of enhancing the golf playing power.

  However, although the above matte golf ball has a psychological effect, it is unsatisfactory in terms of luxury.

JP-A-2006-214326

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a golf ball which has a sense of quality and also has a psychological effect of increasing concentration and enhancing competitiveness.

  The present inventors have conducted intensive studies to achieve the above object, and as a result, as for a golf ball having at least one core and at least one coating layer, at least one of the coating layers has matte particles. By including a glittering material in the same or different layer as the layer containing the matting particles among the coating layers, the player can improve the concentration on the ball at the time of ball impact, The present invention has been found to exhibit a unique and unique ball appearance.

Therefore, the present invention provides the following golf balls.
1. A golf ball comprising at least one core and at least one coating layer, wherein at least one of the coating layers contains matting particles, and among the coating layers, matting particles are formed. A golf ball characterized in that a glittering material is contained in the same or different layer as the layer containing the golf ball.
2. 2. The golf ball according to the above 1, wherein the glittering material is contained in the same layer as the layer containing the matting particles in the coating layer.
3. The coating layer has a two-layer structure of a white coating layer and a top coat layer formed directly on the white coating layer, and the top coat layer contains matting particles and a glittering material. 2. The golf ball according to 1 above.
4. The golf ball has a white cover layer as a constituent member, the coating layer is a single layer formed directly on the white cover layer, and the coating layer contains matting particles and a glittering material. 2. The golf ball according to the above 1, which is included.
5. 2. The golf ball according to claim 1, wherein the coating layer has a two-layer structure of an inner layer and an outer layer, wherein the inner layer contains a glittering material and the outer layer contains matte particles.
6. Any one of the above items 1 to 5, wherein the ratio (a) / (b) of the blending amount of the matting particles (a) and the glittering material (b) contained in the coating layer is from 0.3 to 5.0 in terms of mass ratio. A golf ball according to any one of the above.
7. 7. The golf ball according to any one of 1 to 6, wherein the glittering material is glass flake or mica.
8. 8. The golf ball according to any one of 1 to 7, wherein the reflectance of the coating film layer when the incident angle of the gloss meter is 20 ° is 2.5 or less.
9. 9. The golf ball according to any one of 1 to 8, wherein the reflectance of the coating film layer when the incident angle of the gloss meter is 60 ° is 6.0 or less.
10. 10. The golf ball according to any one of 1 to 9 above, wherein the reflectance of the coating film layer when the incident angle of the gloss meter is 85 ° is 15.0 or less.

  ADVANTAGE OF THE INVENTION According to the golf ball of this invention, by making it a mat | matte finish, while being able to prevent a fall of a game ability by the concentration concentration of a player, a unique and high-class appearance is exhibited.

Hereinafter, the present invention will be described in more detail.
The golf ball of the present invention has at least one core and at least one coating layer.

  The core can be formed using a known rubber material as a base material. As the base rubber, a known base rubber of natural rubber or synthetic rubber can be used, and more specifically, polybutadiene, particularly cis-1,4-polybutadiene having a cis structure of at least 40% or more is mainly used. It is recommended to use In the base rubber, natural rubber, polyisoprene rubber, styrene-butadiene rubber and the like can be used together with the above-mentioned polybutadiene, if desired. Polybutadiene can be synthesized using a Ziegler-based catalyst such as a titanium-based, cobalt-based, nickel-based, or neodymium-based catalyst, or a metal catalyst such as cobalt and nickel.

  Examples of the base rubber include co-crosslinking agents such as unsaturated carboxylic acids and metal salts thereof, inorganic fillers such as zinc oxide, barium sulfate, and calcium carbonate, dicumyl peroxide and 1,1-bis (t-butyl). An organic peroxide such as peroxy) cyclohexane can be blended. If necessary, a commercially available antioxidant or the like can be appropriately added.

  At least one layer of cover can be formed around the core as a member for covering the core. In the case of a two-layer cover, the inside of each layer may be referred to as an intermediate layer, and the outside may be referred to as an outermost layer. In the case of a three-layer cover, each layer may be referred to as an envelope layer, an intermediate layer, and an outermost layer in this order from the inside.

  The material of each layer of the cover is not particularly limited, and includes resins conventionally used as golf ball materials, for example, ionomer resins, polyester resins, polyurethane resins, polyamide resins, polyolefin resins, olefin thermoplastic elastomers. And styrene-based thermoplastic elastomers. In particular, an ionomer resin is preferable, and specifically, (a) an ethylene-α, β unsaturated carboxylic acid copolymer and / or a metal salt thereof, or (b) an ethylene-α, β unsaturated carboxylic acid It is preferable that the composition contains any one of the components (a) and (b) of the -α, β unsaturated carboxylic acid ester copolymer and / or its metal salt.

  Examples of the α, β unsaturated carboxylic acid of the above components (a) and (b) include acrylic acid, methacrylic acid, maleic acid, fumaric acid and the like, and particularly, acrylic acid and methacrylic acid. Is preferred. As the α, β unsaturated carboxylic acid ester of the component (b), a lower alkyl ester of the above unsaturated carboxylic acid is suitable, and specifically, methyl methacrylate, ethyl methacrylate, propyl methacrylate Butyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate and the like, and particularly preferably butyl acrylate (n-butyl acrylate, i-butyl acrylate).

  The metal ion-neutralized product of the copolymer of the components (a) and (b) is obtained by partially converting the acid group of the olefin-unsaturated carboxylic acid (-unsaturated carboxylic acid ester) copolymer with a metal ion. It can be obtained by neutralization. Examples of metal ions for neutralizing acid groups include Na +, K +, Li +, Zn ++, Cu ++, Mg ++, Ca ++, Co ++, Ni ++, Pb ++, and the like. And Na +, Li +, Zn + +, Mg + +, Ca + + and the like are particularly preferably used. Such a neutralized product can be obtained by a known method. For example, formic acid, acetate, nitrate, carbonate, hydrogen carbonate, oxide, hydroxide, And a compound such as an alkoxide can be used to obtain a neutralized product.

  Known components can be used as the components (a) and (b). For example, as commercial products, acid copolymers such as Nucrel N1560, N1214, N1035, AN4221C, AN4311, AN4318, AN4319 (all manufactured by DuPont-Mitsui Polychemicals) and the like can be mentioned. . As the metal ion neutralized product of the acid copolymer, for example, Himilan 1554, 1557, 1601, 1605, 1706, AM7311, 1855, 1856, and AM7316 (all of which are Mitsui / Dupont Polychemicals) Co., Ltd.), Surlyn 7930, 6320, 8320, 9320, 8120 (manufactured by DuPont), and the like.

  In the cover, the resin material of the outermost layer may contain a colorant made of a fluorescent dye or a fluorescent pigment or a white pigment such as titanium oxide. That is, in order to finish a color ball in which the surface of the ball gives a dull and gentle impression, a coloring agent composed of a fluorescent dye or a fluorescent pigment can be blended in the resin material of the outermost layer. As the coloring agent, a known fluorescent dye or fluorescent pigment is appropriately blended to color the outermost layer of the cover. Here, for example, solvent yellow (dye), solvent orange (dye), anthraquinone (dye), phthalocyanine (dye), a yellow fluorescent pigment, a pink fluorescent pigment, an orange fluorescent pigment and the like can be mentioned. As these, known commercial products can be used.

  When using the above colorant, it is preferable to employ a fluorescent colorant having a light-collecting property. Here, the fluorescent colorant having a light-collecting property is a material having a function of condensing sunlight and converting the wavelength to a longer wavelength side as a fluorescent color, while totally reflecting inside the colored material. The light is condensed by being guided to the dimple edge, is emitted in a state where the density is increased at the dimple edge, and is strongly colored.

  Examples of the light-collecting fluorescent colorant include orange, pink, red, yellow, blue, and violet, and a commercially available product can be used in any of the coloring systems. For example, product names "Lumogen F Yellow 083", "Lumogen F Orange 240", "Lumogen F Red 305", "Lumogen F Blue 650" (all manufactured by BASF), "Lumi Color Red", "Smart Color LP Green" , "Smart Color LP Yellow" and "Smart Color LP Orange" (all manufactured by Confectionery Technology Co., Ltd.) and the like.

  The amount of the coloring agent is 0.001 to 0.2 part by mass, preferably 0.005 to 0.1 part by mass, based on 100 parts by mass of the resin material of the outermost layer. When the amount is too small, the fluorescence becomes weak, and a desired design property may not be obtained. Conversely, if the amount is too large, migration of the colorant, particularly the dye, occurs, and there is a possibility that the colorant, which is in contact with the golf ball, will be dyed.

  When a white pigment is used, examples of the white pigment include titanium oxide, zinc oxide, and barium sulfate. Titanium oxide is preferable from the viewpoint of concealing properties and corrosion resistance. In the present invention, as will be described later, the coating layer (coating layer) contains a glittering material. However, when the outermost cover layer, which is the base of the coating layer (coating layer), has a color other than white, the color and the glitter are different. The colors of the materials are mixed, and it becomes difficult to obtain a desired color on the ball surface. Further, the coating layer may become white and cloudy depending on the amount of the matting agent such as silica. In this case, if the base color of the coating film layer is a color other than white, it is difficult to produce a desired color on the ball surface. Therefore, it is preferable that the outermost cover layer, which is the base of the coating layer (coating layer), is white.

  When a white pigment is used, the amount of the white pigment is 1.0 to 10.0 parts by mass, preferably 2.0 to 5.0 parts by mass, based on 100 parts by mass of the resin material of the outermost layer. is there. If the amount is too small, the desired white color cannot be obtained, while if the amount is too large, the durability of the layer containing the white pigment may be reduced.

  An inorganic filler or an organic filler can be blended in the resin material of the outermost layer. When an inorganic filler is employed, the material is not particularly limited, and examples thereof include calcium carbonate and silica.

  On the other hand, when an organic filler is employed, the material is not particularly limited, but examples thereof include cross-linked polymethyl methacrylate (cross-linked PMMA), cross-linked polybutyl methacrylate, cross-linked polyacrylic ester, and cross-linked acrylic resin. Fine particles such as a styrene copolymer, a melamine resin, and a polyurethane may be used.

  The compounding amount of the inorganic filler or the organic filler is 0.01 to 1.0 part by mass, preferably 0.02 to 0.2 part by mass, based on 100 parts by mass of the resin material. If the blending amount is too large, the concealing property becomes too high, so that the high-quality ball design may be impaired, or the color change when discolored by exposure to sunlight may increase.

  In the above resin composition, various additives can be further compounded as necessary. For example, a pigment, a dispersant, an antioxidant, a light stabilizer, an ultraviolet absorber, a lubricant and the like can be appropriately compounded. it can.

  The resin composition can be obtained, for example, by mixing the above-described components using various kneading machines such as a kneading type (single screw or twin screw) extruder, a Banbury, a kneader and the like.

  One or more dimples can be formed on the surface of the outermost layer, and the shape, diameter, depth, number, occupied surface area, and the like of the dimples are appropriately selected.

The present invention is a golf ball having a coating layer (coating layer), wherein the coating layer is formed of a coating composition containing matting particles.
The coating composition is not particularly limited, but is preferably a urethane-based coating. A two-component curable urethane paint, particularly a non-yellowing urethane paint, is preferably used because it is necessary to withstand severe use conditions of a golf ball.

  In the case of a two-component curable urethane coating, various polyesters such as saturated polyester polyols, acrylic polyols and polycarbonate polyols are used as the main agent, and non-yellowing polyisocyanates such as hexamethylene diisocyanate and isophorone diisocyanate are used as the isocyanate. It is preferable to use adducts such as hydrogenated xylylene diisocyanate, burettes, isocyanurates, or mixtures thereof.

  The matting particles include, for example, silica-based, melamine-based, and acrylic-based. Specific examples include silica, polymethyl methacrylate, polybutyl methacrylate, polystyrene, polybutyl acrylate, and the like. An organic type or an inorganic type may be used, and silica is particularly preferably used.

The specific surface area of the matte particles is preferably 200 to 400 m ² / g in terms of BET specific surface area from the viewpoint of quenching properties and applicability.

  The average primary particle diameter of the matte particles is preferably 1.0 to 3.0 μm from the viewpoint of spin performance and quenching. If this value exceeds 3.0 μm, the surface of the ball becomes rough, so that the spin performance is adversely affected and the performance may be reduced. On the other hand, if this value is too small, the quenching effect may be reduced.

  The compounding amount of the above matting particles can be preferably 5 to 10 parts by mass with respect to 100 parts by mass of the main component (the total amount of the resin component and the solvent) of the coating composition. If the amount is too large, the viscosity of the coating composition tends to increase and the coating workability tends to be poor. If the amount is too small, the quenching effect may be reduced.

  Among the coating layers, the same or a different layer from the layer containing the matting particles contains a glittering material. In particular, it is preferable that the glittering material is contained in the same layer as the layer containing the matting particles.

  As the glittering material, various materials can be used. In particular, metal powder pigments, glass flakes, mica, pearl pigments, and the like can be suitably used. As the metal powder pigment, specifically, aluminum powder, bronze powder, stainless steel powder, nickel powder and the like can be used. Among these, aluminum powder can be preferably used because the color tone can be easily adjusted in combination with a coloring pigment or dye. As such an aluminum pigment, commercially available products such as “Aluminum Paste Hi-Print TD200T” and “Metasheen Slurry KM100” (both products are manufactured by Toyo Aluminum Co., Ltd.) can be used. In addition, pearl pigments are roughly classified into metal oxide-coated mica, basic lead carbonate, bismuth oxychloride, and natural fish phosphorous foil. It is preferred to choose an object-coated mica. As this metal oxide, generally, titanium dioxide and iron oxide are often used, and various colors and interference effects can be obtained by changing the coverage (the thickness of the coating layer). The greater the particle size of these pigments, the higher the glitter. However, the larger the particle size of the pigment, the more easily the glittering sedimentation occurs. Therefore, it is necessary to select a pigment having an appropriate particle size within a range that does not impair the effects of the present invention.

  The blending amount of the brilliant material can be preferably 1.0 to 10.0 parts by mass with respect to 100 parts by mass of the main agent (the total amount of the resin component and the solvent) of the coating composition of the coating layer. If the amount is too large, for example, during spray coating, the sprayability of the spray gun may be reduced, so that coating workability may be lacking.If the amount is too small, a high-grade feeling of a desired ball appearance may not be obtained. is there.

  The ratio (a) / (b) of the compounding amount of the matte particles (a) and the glittering material (b) contained in the coating layer is determined from the viewpoint of the balance between the gloss suppressing effect on the ball surface and the sense of quality. The ratio is preferably from 0.3 to 5.0, and more preferably from 1.0 to 2.5. If the compounding ratio is less than the above, the gloss of the surface of the golf ball cannot be suppressed, and if the compounding ratio is more than the above, a sense of quality may not be obtained.

  As a specific configuration of the coating film layer, when the coating film layer is a single layer, a mode in which the same layer as the layer containing the matting particles contains a glittering material, or when the coating film layer is two layers, An embodiment in which the inner layer contains a glittering material and the outer layer contains matte particles.

  Further, the layer structure of the coating layer may be a two-layer structure of a white coating layer and a top coat layer formed directly on the white coating layer. In this case, both the matting particles and the glitter material can be included in the top coat layer.

  Further, when the coating layer is a single layer, the golf ball has a white cover layer as a constituent member, and the single or multiple coating layers are formed directly on the white cover layer. Is preferred. Depending on the amount of the matting agent such as silica, the coating layer may become white and cloudy, and if the color of the base of the coating layer is a color other than white, it becomes difficult to obtain a desired color on the ball surface. It is preferable that the outermost cover layer, which is the base of the coating layer, is white.

  The reflectance of the coating layer (coating layer) measured by a gloss meter is 2.5 or less at an incident angle of 20 °, 6.0 or less at an incident angle of 60 °, and at an incident angle of 85 °. It is preferable that it is 15.0 or less. As described above, a matte effect can be provided by a coating layer (coating layer) that is optimized so that the reflectance satisfies the numerical range. The measurement conditions of the reflectance by the gloss meter described above are measured by using a measuring device used in Examples described later and applying a 20 μm-thick coating to an ABS resin plate.

  The ball specifications such as the mass and diameter of the golf ball of the present invention can be appropriately set according to the golf rules.

  Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Examples 1 to 5, Comparative Examples 1 to 3]
As shown in Table 1 below, solid cores of each example were prepared by vulcanizing at 155 ° C. for 15 minutes using the following rubber composition common to all examples.

The details of the core material are as follows.
・ "Polybutadiene rubber" JSR, brand name "BR01"
・ "Organic peroxide" Dicumyl peroxide, trade name "Park Mill D" made by NOF
・ “Barium sulfate” manufactured by Sakai Chemical Industry Co., Ltd. ・ “Zinc oxide” manufactured by Sakai Chemical Industry Co., Ltd. ・ “Zinc acrylate” manufactured by Nippon Shokubai Co., Ltd. ・ “Pentachlorothiophenol zinc salt” manufactured by Wako Pure Chemical Industries

Formation of cover (intermediate layer and outermost layer) Next, an intermediate layer having a thickness of 1.35 mm common to all examples and having a thickness of 1.35 mm shown in Table 2 below was formed around the core having a diameter of 37.3 mm obtained above. To produce an intermediate layer-coated sphere having a diameter (outer diameter) of 40 mm. Next, the outermost layer material having a thickness of 1.35 mm shown in the same table was coated around the intermediate layer-coated sphere by an injection molding method to produce a three-piece golf ball having a ball diameter of 42.7 mm. At this time, common dimples were formed on the outermost layer surfaces of the respective examples and comparative examples, although not particularly shown.

Details in the above table are as follows.
-"HPF1000": ionomer resin material manufactured by DuPont-"Himilan 1605""Himilan1557": ionomer resin manufactured by Mitsui-Dupont Polychemicals-Titanium oxide: white pigment

  Next, for the golf balls of the examples and comparative examples, a two-pack curable urethane paint composed of a main agent and a curing agent shown in Table 3 below was used as a coating layer (coating layer), and the surface of the outermost layer was used. Was applied to a thickness of 15 μm to form a single coating layer (coating layer).

The details of the main agent and the curing agent are as follows (i) to (iv).
(I) First, 140 parts by mass of trimethylolpropane, 95 parts by mass of ethylene glycol, 157 parts by mass of adipic acid, 157 parts by mass of adipic acid, 1,4-cyclohexanediene were added to a reactor equipped with a reflux condenser, a dropping funnel, a gas inlet tube and a thermometer. 58 parts by mass of methanol was charged, the temperature was raised to 200 to 240 ° C. with stirring, and the mixture was heated (reacted) for 5 hours. Thereafter, a "saturated polyester polyol" having an acid value of 4, a hydroxyl value of 170, and a weight average molecular weight (Mw) of 28,000 was obtained.
(Ii) Next, the polyester polyol synthesized above was dissolved in butyl acetate to prepare a varnish having a nonvolatile content of 70% by mass.
(Iii) 27.5 parts by mass of the saturated polyester polyol solution was dissolved with butyl acetate (27.5% by mass of the non-volatile content of this solution), and as matting particles, silica ("Finesil X-" manufactured by Maruo Calcium Co., Ltd.) was used. No. 35, an average primary particle diameter of 2.4 μm, a BET specific surface area of 262 m ² / g) and natural mica (“Iriodin 7205” manufactured by Sano Paint Co., Ltd.) as a glittering material were used as a main ingredient.
(Iv) Next, as a curing agent, an isocyanate shown in Table 3 is used by dissolving it in an organic solvent. That is, HDI Nurate (“Duranate TPA-100” manufactured by Asahi Kasei Corporation, NCO content: 23.1% by mass, non-volatile content: 100% by mass) and ethyl acetate as an organic solvent were adjusted so that the mixing ratio shown in Table 3 was obtained. And butyl acetate were added to prepare a coating resin composition.

  The gloss and luxury of the golf balls obtained in each of the examples and comparative examples were measured and evaluated, and the results are shown in Table 4 below.

The glossiness of the coating layer (coating layer) on the glossy golf ball surface was evaluated as follows. The glossiness at a measurement incident angle of 20 ° / 60 ° / 85 ° was measured by “micro-TRI-gloss” manufactured by BYK. The glossiness at a measurement incident angle of 20 ° / 60 ° / 85 ° was measured by “micro-TRI-gloss” manufactured by BYK. Regarding the numerical value of the gloss at each measurement angle, if the incident angle is 2.5 or less at an incident angle of 20 °, 6.0 or less at an incident angle of 60 °, and 15.0 or less at an incident angle of 85 °, the gloss is sufficiently suppressed. Was evaluated as “◎”. Also, if the incident angle is 2.6 to 5.0 at an incident angle of 20 °, 6.1 to 20.0 at an incident angle of 60 °, and 15.1 to 40.0 at an incident angle of 85 °, the glossiness is slightly suppressed. Was evaluated as “「 ”. Other than that, it was evaluated as “x” as having glossiness.

The golfer of 30 high-quality golfers visually evaluated the "high-quality" according to the following criteria.
A: Of the 30 people, 25 or more have a sense of quality.
: 15 to 24 persons among 30 persons have a high-class feeling.
Δ: 6 to 14 persons among 30 persons have a high-class feeling.
×: Five or less out of 30 have a high-class feeling.

From the results shown in Table 4, the golf balls of Examples 1 to 5 have almost no gloss of the coating layer, are matte golf balls, and have a high-grade appearance.
On the other hand, the golf ball of Comparative Example 1 is a golf ball having a matte feeling, but does not have a sense of quality.
The golf ball of Comparative Example 2 has an appearance without a matte feeling and a luxurious feeling.
The golf ball of Comparative Example 3 has a high-class appearance but has no matte appearance.

Claims (10)

  A golf ball comprising at least one core and at least one coating layer, wherein at least one of the coating layers contains matting particles, and among the coating layers, matting particles are formed. A golf ball characterized in that a glittering material is contained in the same or different layer as the layer containing the golf ball.   The golf ball according to claim 1, wherein the same layer as the layer containing the matting particles in the coating layer contains a glittering material.   The coating layer has a two-layer structure of a white coating layer and a top coat layer formed directly on the white coating layer, and the top coat layer contains matting particles and a glittering material. The golf ball according to claim 1.   The golf ball has a white cover layer as a constituent member, the coating layer is a single layer formed directly on the white cover layer, and the coating layer contains matting particles and a glittering material. The golf ball according to claim 1, which is included.   2. The golf ball according to claim 1, wherein the coating layer has a two-layer structure of an inner layer and an outer layer, wherein the inner layer contains a glittering material and the outer layer contains matte particles.   The ratio (a) / (b) of the compounding amount of the matting particles (a) and the glittering material (b) contained in the coating layer is from 0.3 to 5.0 in terms of mass ratio. A golf ball according to any one of the preceding claims.   The golf ball according to any one of claims 1 to 6, wherein the glitter material is glass flake or mica.   The golf ball according to any one of claims 1 to 7, wherein a reflectance of the coating layer when the incident angle of the gloss meter is 20 ° is 2.5 or less.   The golf ball according to any one of claims 1 to 8, wherein the reflectance of the coating layer when the incident angle of the gloss meter is 60 ° is 6.0 or less.   The golf ball according to any one of claims 1 to 9, wherein the reflectance of the coating layer when the incident angle of the gloss meter is 85 ° is 15.0 or less.