Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G13/00—Protecting plants
  • A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
  • A01G9/14—Greenhouses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
  • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
  • B32B23/14—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose characterised by containing special compounding ingredients
  • B32B23/18—Fillers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
  • B32B23/22—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising ethers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/12—Chemical modification
  • C08J7/16—Chemical modification with polymerisable compounds
  • C08J7/18—Chemical modification with polymerisable compounds using wave energy or particle radiation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
  • C08L1/02—Cellulose; Modified cellulose
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
  • C08L1/08—Cellulose derivatives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/10—Block- or graft-copolymers containing polysiloxane sequences
  • C08L83/12—Block- or graft-copolymers containing polysiloxane sequences containing polyether sequences
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
  • C09D101/08—Cellulose derivatives
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/02—Emulsion paints including aerosols
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
  • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
  • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Definitions

• the present invention relates to a coating composition for agricultural films used as a covering material for agricultural houses and a modified thermoplastic polymer film for agriculture to which such a coating composition is attached.
• thermoplastic polymer film is widely used as a covering material for agricultural houses.
• thermoplastic polymer film itself has a hydrophobic property, there is a problem that it is likely to cause clouding and decrease the transmission of sunlight, resulting in poor growth of crops.
• agricultural films added with an antifogging agent or coated with a dropping agent have been used (see, for example, Patent Documents 1 to 3).
• these conventional means after being stretched on an agricultural house, are able to obtain initial dripping properties, but repeatedly contact the house aggregate during long-term use, and such contact is dry. When it is carried out under conditions where the state and the wet state are repeated, there is a problem that the drip property is lost.
• the conventional means is inferior in actual durability.
• JP-A-9-298954 Japanese Patent Laid-Open No. 11-10784 Japanese Patent Laid-Open No. 2004-255807
• the problem to be solved by the present invention is that after being stretched on an agricultural house, the initial drip property is good, and it repeatedly contacts with the aggregate of the agricultural house during long-term use.
• a coating composition for agricultural film capable of maintaining good drip properties even when such contact is repeated in a dry state and a wet state, and agricultural use using such a composition It is in providing a modified thermoplastic polymer film.
• a coating composition for agricultural films comprising an inorganic colloidal sol, a specific cellulose derivative, and a water-soluble crosslinking agent in a specific ratio. It was found to be correct and suitable.
• the present invention is characterized in that the inorganic colloidal sol contains 30 to 70% by mass in terms of solid content, 20 to 60% by mass of the following cellulose derivative, and 1 to 30% by mass of a water-soluble crosslinking agent.
• the present invention relates to an agricultural film coating agent composition.
• the present invention also relates to an agricultural modified thermoplastic polymer film to which the agricultural film coating composition is attached.
• the composition of the present invention comprises an inorganic colloidal sol in a proportion of 30 to 70% by mass in terms of solid content, 20 to 60% by mass of the above cellulose derivative, and 1 to 30% by mass of a water-soluble crosslinking agent.
• the inorganic colloidal sol contains 40 to 67% by mass in terms of solid content, 30 to 50% by mass of the above cellulose derivative, and 3 to 25% by mass of a water-soluble crosslinking agent.
• Crosslinker is preferably contained at a ratio of 10/1 to 10/5 (mass ratio).
• silica sol and alumina sol examples include so-called silica sol and alumina sol. Commercially available water dispersions may be used, and these may be used alone or in combination.
• Silica sols include cationic acidic silica sols such as Snowtex AK and Snowtex AK-L (all are trade names manufactured by Nissan Chemical Co., Ltd.), Snowtex 30, Snowtex 30L and Snowtex ZL (all are Nissan) Chemical product name), Cataloid SI-30, Cataloid SI-45P, Cataloid SI-80P (all of which are trade names made by JGC Catalysts & Chemicals), etc., anionic alkaline silica sol, Snowtex O, Snowtex OL (All are trade names manufactured by Nissan Chemical Co., Ltd.) and anionic acidic silica sols such as Cataloid SN (trade name manufactured by JGC Catalysts & Chemicals) are listed.
• alumina sol examples include alumina sol 100, alumina sol 200, alumina sol 520 (and above). , Both are product names manufactured by Nissan Chemical Co., Ltd.), Cataloid A -1, Cataloid AS-2 (above all are JGC Catalysts and Chemicals Co., trade name) and cationic acidic alumina sol and the like.
• a silanol-forming organic silane compound is hydrolyzed in the presence of the inorganic colloid sol, the resulting silanol compound is condensed and polymerized, and the condensation polymer is adhered to the surface of solid particles of the inorganic colloid sol.
• a modified inorganic colloid sol can also be used.
• the silanol-forming organosilane compound used for modifying the inorganic colloid sol include 1) trialkoxysilanes, 2) dialkoxysilanes, and 3) monoalkoxysilanes.
• trialkoxysilanes include methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, ⁇ -chloropropyltripropoxysilane, ⁇ -mercaptopropyltriethoxysilane, ⁇ -glycidoxypropyltri Examples include methoxysilane, ⁇ -methacryloxypropyltriethoxysilane, ⁇ -ureidopropyltrimethoxysilane, and phenyltrimethoxysilane.
• dialkoxysilanes examples include dimethyldimethoxysilane, ⁇ -chloropropylmethyldimethoxysilane, and ⁇ -glycol.
• Sidoxypropylmethyldimethoxysilane and the like, and monoalkoxysilanes include trimethylmethoxysilane and the like.
• ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -ureidopropyltrimethoxysilane, and methyltriethoxysilane are preferable as the silanol-forming organosilane compound.
• Such a silanol-forming organosilane compound is preferably used at a ratio of 1 to 30 parts by mass with respect to 100 parts by mass in terms of solid content of the inorganic colloid sol.
• the cellulose derivative used for the composition of the present invention is at least one selected from carboxymethylcellulose metal salt, hydroxyethylcellulose, hydroxypropylmethylcellulose and methylcellulose. These can be used alone or in combination.
• Such a cellulose derivative preferably has a viscosity of 1 to 600 mPa ⁇ s at 20 ° C. in a 2% by weight aqueous solution, more preferably 1 to 400 mPa ⁇ s.
• water-soluble crosslinking agent to be used in the composition of the present invention examples include water-soluble melamine, water-soluble epoxy, water-soluble oxazoline, water-soluble aziridin, and the like, but water-soluble melamine is preferable.
• water-soluble melamine commercially available products can be used.
• composition of the present invention can further contain a polyether-modified silicone.
• a polyether-modified silicone is used at a ratio of 0.1 to 50 parts by mass with respect to 100 parts by mass in terms of solid content of the inorganic colloidal sol.
• a commercially available product can be used as it is.
• examples of such commercial products include TSF4440, TSF4441, TSF4445, TSF4446, TSF4452, and TSF4460 (all of which are trade names of Momentive Performance Materials Japan), X22-4952, X-22-4272, KF-6123, KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-615A, KF-945, KF-640, KF-642, KF-643, KF-644, KF- 6204, X-22-4515, KF-6004 (all are trade names manufactured by Shin-Etsu Silicone), SH8700, SH8410, SH8400, L-7002, FZ-2104, FZ-77, L-7604, FZ-2203 , FZ-2208 (above, either Although manufactured by Dow Corning Toray Co., Ltd. under the trade name) and the like, and among
• the film of the present invention is such that the above-described composition of the present invention adheres in a solid content of 0.15 to 0.5 g / m 2 on the surface-treated surface of a thermoplastic polymer film.
• thermoplastic resin used in the film of the present invention examples include 1) polyolefin resin, 2) polyvinyl chloride resin, and 3) polyester resin.
• polyolefin resins include homopolymers of ⁇ -olefins such as polyethylene and polypropylene, ethylene-propylene copolymers, ethylene / 1-butene copolymers, ethylene / 4-methyl-1-pentene copolymers, ethylene ⁇ -olefin copolymer such as 1-hexene copolymer, ethylene / 1-octene copolymer, ethylene / vinyl acetate copolymer, ethylene / methyl methacrylate copolymer, ethylene / vinyl acetate / methyl methacrylate copolymer Copolymers and copolymers with different monomers mainly composed of ⁇ -olefin such as ionomer resins.
• polyvinyl chloride resins include polyvinyl chloride, vinyl chloride / ethylene copolymers, vinyl chloride / acetic acid. Examples include vinyl copolymers, vinyl chloride / methyl methacrylate copolymers, and polyvinylidene chloride. As the polyester-based resin and polyethylene terephthalate. These may be used by blending a plurality of types of thermoplastic resins. Of these, polyolefin resins are preferred as the thermoplastic resin.
• the ⁇ -olefin copolymer in the polyolefin resin is more preferably obtained by a gas phase method, a solution polymerization method, etc., using a known homogeneous catalyst such as a highly active Ziegler catalyst or a metallocene catalyst. Is particularly preferably 0.86 to 0.94 g / cm 3 and MFR 0.01 to 20 g / 10 min.
• the polyolefin resin can be used by mixing two or more polyolefin resins. These thermoplastic resins contain commonly used antioxidants, weathering agents, ultraviolet absorbers, infrared absorbers, lubricants, antiblocking agents, antifogging agents, antifogging agents, heat retention agents, pigments, etc. as necessary. Can be contained.
• the method for producing the thermoplastic polymer film used for the film of the present invention is not particularly limited, and examples thereof include an inflation molding method and a T-die molding method.
• the film may be a single layer film or a multilayer film, and may be an unstretched film or a stretched film.
• a thermoplastic polymer film made of the polyolefin resin formed by inflation molding is suitable.
• the film of the present invention is preferably one in which the surface of the thermoplastic polymer film to be coated with the composition of the present invention is subjected to surface treatment and then the composition of the present invention is coated.
• the surface treatment can be performed by a known method such as corona discharge treatment, atmospheric pressure plasma treatment, flame treatment, etc., but corona discharge treatment is preferred.
• the wetting tension of the surface treated surface is preferably 35 mN / m or more, more preferably 35 to 70 mN / m. In the present invention, the wetting tension is a value measured according to the description of JIS-K6768.
• a known coating method can be used as a method of applying the composition of the present invention to the thermoplastic polymer film.
• a known coating method can be used as a method of applying the composition of the present invention to the thermoplastic polymer film.
• examples thereof include a gravure coating method, a spray coating method, a dip coating method, a roll coating method, a doctor blade coating method, a wire bar coating method, and an air knife coating method.
• the initial drip property is good, and repeatedly contacted with the aggregate of the agricultural house during long-term use, and such contact Even if it is a case where it is performed under the condition where a dry state and a wet state are repeated, there is an effect that a good drip property can be maintained.
• Test Category 1 (Preparation of (modified) inorganic colloid sol) 39.10 parts of water and 59.61 parts of inorganic colloidal sol (A-1) (solid content: 23%) were mixed, and further ⁇ -glycidoxypropyltrimethoxysilane 1 as a silanol-forming organosilane compound (D-1). .29 parts (100% solid content) were mixed to prepare a liquid mixture having a solid content concentration of 15%, and then stirred at 50 ° C. for 5 hours to hydrolyze the silanol-forming organosilane compound (D-1). Further, the produced silanol compound was subjected to condensation polymerization to obtain a modified inorganic colloidal sol (K-1).
• modified inorganic colloidal sol (K-1) had a silanol compound condensation polymer adhered to solid particles of the inorganic colloidal sol.
• modified inorganic colloid sols (K-2) to (K-5) were prepared. Table 1 summarizes the contents of the modified inorganic colloid sol prepared in each of the above examples.
• Ratio (part) Ratio (part) in terms of solid content
• A-3 Anionic acidic silica sol
• A-5 Anionic alkaline silica sol D-1: ⁇ -glycidoxypropyltrimethoxysilane
• D-2 ⁇ -ureidopropyltrimethoxysilane
• D-3 Methyltri Ethoxysilane Test Category 2 (Preparation of coating composition for agricultural film)
• Example 1 26.5 parts of modified inorganic colloid sol (K-1) having a solid content concentration of 15%, 467 parts of water, 5 parts of cellulose derivative (B-1), water-soluble crosslinking agent (C-1) 1 having
• Examples 2 to 27 and Comparative Examples 1 to 5 In the same manner as in Example 1, the agricultural film coating agent compositions (X-2) to (X-27) and (rx-1) to (rx-) of Examples 2 to 27 and Comparative Examples 1 to 5 were used. 5) was obtained. The contents of the agricultural film coating composition prepared in each of the above examples are summarized in Table 2.
• (Modified) Ratio of inorganic colloid sol, cellulose derivative and water-soluble crosslinking agent parts by mass as solid content
• Mass ratio Cellulose derivative / water-soluble crosslinking agent
• Ratio of polyether-modified silicone (Modified) Conversion of solid content of inorganic colloid sol K-1 to K-5: Modified inorganic colloidal sol described in Table 1 A-1 to A-5: Inorganic colloidal sol described in Table 1 B-1: Hydroxypropylmethylcellulose (2% aqueous solution) (Viscosity at 20 ° C 50 mPa ⁇ s)
• B-2 Hydroxypropyl methylcellulose (viscosity of 2% aqueous solution at 20 ° C.
• B-3 Hydroxypropyl methylcellulose (viscosity of 2% aqueous solution at 20 ° C. 400 mPa ⁇ s)
• B-4 Methyl cellulose (viscosity of 2% aqueous solution at 20 ° C. 4 mPa ⁇ s)
• B-5 Sodium carboxymethylcellulose (viscosity of 2% aqueous solution at 20 ° C. 150 mPa ⁇ s)
• B-6 Hydroxyethyl cellulose (2% aqueous solution viscosity at 20 ° C.
• this olefin polymer film was subjected to corona treatment discharge, the wet tension of the corona discharge treatment surface was set to 42 mN / m, and then the coating composition for agricultural film (X -1) was applied by a gravure coating method so that the solid content would be 0.3 g / m 2, and was allowed to stay in a warm air drying oven adjusted to 70 ° C. for 1 minute to produce an agricultural modified thermoplastic polymer film. Obtained.
• F-1 Ethylene / 1-butene copolymer (ethylene copolymerization ratio 95%, density 0.920 g / cm 3 , MFR 2.1 g / 10 min)
• F-2 Ethylene / 1-hexene copolymer (ethylene copolymerization ratio 96%, density 0.930 g / cm 3 , MFR 1.0 g / 10 min)
• F-3 Ethylene / vinyl acetate copolymer (ethylene copolymer ratio 93%, MFR 1.5 g / 10 min)
• F-4 Polyethylene (density 0.927 g / cm 3 , MFR 4.0 g / 10 min)
• F-5 ethylene-propylene copolymer (ethylene copolymerization ratio 4%, density 0.90 g / cm 3 , MFR 8.0 g / 10 min)
• X-1 to X-27, rx-1 to rx-5 Coating agent composition for agricultural film described in Table 2 Test category 5 (
• the time required for the water droplet adhesion area to be less than 10% was measured as the initial flowability, and evaluated according to the following criteria. Moreover, the adhesion state of the water drop after having been placed for 30 days continuously was visually observed and evaluated according to the following criteria.
• Evaluation criteria for initial dropability A Less than 15 minutes after spreading (very excellent initial dropability). ⁇ : 15 minutes or more and less than 30 minutes after spreading (excellent initial drop property).
• Adhesion area of water droplets is less than 10% and excellent in droplet sustainability.
• Water droplet adhesion area is 10% or more and less than 50%, which is inferior in the flowability.
• X Adhesion area of water droplets is 50% or more, and the droplet sustainability is remarkably inferior.
• Evaluation criteria for dry scratch resistance A The coating film is not peeled off, and the scratch resistance is very excellent.
• ⁇ The peeled area of the coating film is less than 10%, and the scratch resistance is excellent.
• ⁇ The peeled area of the coating film is 10% to less than 50%, and the scratch resistance is poor.
• X The peeling area of the coating film is 50% or more, and the scratch resistance is remarkably inferior.
• ⁇ Evaluation of wet scratch resistance 100 cm 2 of the coated surface of the modified thermoplastic polymer film for agricultural use of each example produced in Test Category 4 was wetted with water, and a friction tester (Gakushin dyeing fastness) The test piece, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) was subjected to 10 reciprocating frictions on the wet coated surface with a 300 g load applied with a vinyl tape on the friction surface of the arm, and then the rubbed part. The degree of peeling of the coating film was observed by the cloudy part formed by applying steam to the water droplets, and the peeling resistance strength of the coating film was evaluated as the wet scratch resistance according to the following criteria.
• Wet scratch resistance evaluation criteria A There is no peeling of the coating film, and the scratch resistance is very excellent.
• ⁇ The peeled area of the coating film is less than 10%, and the scratch resistance is excellent.
• ⁇ The peeled area of the coating film is 10% to less than 50%, and the scratch resistance is poor.
• X The peeling area of the coating film is 50% or more, and the scratch resistance is remarkably inferior.

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