Heat-shielding resin composition, heat-shielding film, and heat-shielding material for agricultural and horticultural facility

Abstract

To provide a resin composition that comprises fine particles of an infrared shielding material dispersed satisfactorily in a polyethylene-based resin, the resin composition being suitable as a material for use in agricultural and horticultural facility, and to provide a heat-shielding film obtained by forming a film thereof, and an agricultural and horticultural facility material.SOLUTION: A polyethylene-based resin composition contains (A) a polyethylene-based resin, (B) a plasticizer for polyvinyl chloride or a softener for non-aromatic rubber, and (C) fine particles of an infrared shielding material, wherein the component (A) preferably contains (A1) a polyethylene with a density of 940 kg / m3 or more and (A2) an acid-modified polyethylene, and the component (B) preferably contains (B1) an ester of a polycarboxylic acid and a saturated aliphatic alcohol or (B2) a paraffin-type mineral oil.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heat-shielding resin composition, a heat-shielding film, and a material having heat-shielding properties for use in agricultural and horticultural facilities. [Background technology]

[0002] Traditionally, agricultural and horticultural facilities, such as greenhouses, have been used in the cultivation of agricultural and horticultural crops, with roofing and wall materials made of resin films, such as polyethylene resin films, polyvinyl chloride resin films, and fluorine-containing polymer resin films. Here, for agricultural and horticultural crops such as strawberries, tomatoes, and lettuce, if the facility is exposed to strong sunlight and the temperature inside becomes too high, growth is impaired, so temperature control within the facility is necessary. Methods for controlling the temperature within the facility include covering with cheesecloth or shading netting, opening parts of the roof or walls, and air conditioning the facility. However, covering with cheesecloth or shading netting has the disadvantage of blocking light (mainly visible light with wavelengths of 400 to 500 nanometers and 600 to 700 nanometers) necessary for the growth of agricultural and horticultural crops. The method of opening a part of the roof or wall has the disadvantage that it undermines the purpose of using the agricultural and horticultural facility (wind protection, prevention of the invasion of pests flying in from outside, and prevention of the escape of bumblebees and other insects released for the purpose of insect pollination). The method of cooling the inside of the agricultural and horticultural facility has the disadvantage of consuming a lot of energy.

[0003] Therefore, films have been proposed as materials for agricultural and horticultural facilities, in which fine particles of an infrared-shielding material are contained in a base resin to exhibit heat-shielding properties by blocking near-infrared rays while transmitting visible light (e.g., Patent Documents 1 to 4). Furthermore, tungsten oxide fine particles and / or composite tungsten oxide fine particles have been proposed as fine particles of an infrared-shielding material that have a good balance between near-infrared shielding properties and visible light transmittance (Patent Documents 5 and 6). However, resin compositions in which fine particles of an infrared-shielding material are contained in polyethylene have the disadvantage of poor dispersibility. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-369629 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-314218 [Patent Document 3] Japanese Patent Application Laid-Open No. 2007-222061 [Patent Document 4] Japanese Patent Application Laid-Open No. 2015-017221 [Patent Document 5] International Publication No. 2005 / 037932 [Patent Document 6] International Publication No. 2019 / 155996 [Patent Document 7] Japanese Patent Application Publication No. 57-151897 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide a polyethylene resin composition in which fine particles of an infrared-shielding material are well dispersed and which is suitable as a material for use in agricultural and horticultural facilities; a heat-shielding film comprising at least one layer formed from the resin composition; and a material for use in agricultural and horticultural facilities having heat-shielding properties and comprising the resin composition or the film. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that the above object can be achieved by using a specific resin composition.

[0007] That is, the various aspects of the present invention are as follows. [1]. (A) 100 parts by mass of polyethylene resin, (B) 0.01 to 10 parts by mass of at least one selected from the group consisting of plasticizers for polyvinyl chloride and non-aromatic rubber softeners, and (C) Infrared shielding material fine particles: 0.01 to 10 parts by mass A polyethylene resin composition comprising: [2]. The polyethylene resin composition according to item [1], wherein the component (B) contains (B1) an ester of a polycarboxylic acid and a saturated aliphatic alcohol. [3]. The polyethylene resin composition according to item [2], wherein the component (B1) ester of a polycarboxylic acid and a saturated aliphatic alcohol includes an ester of a polycarboxylic acid and a saturated aliphatic alcohol having 8 to 12 carbon atoms. [4]. The polyethylene resin composition according to item [1], wherein the component (B) contains (B2) a paraffinic mineral oil. [5]. The component (A) polyethylene resin is (A1) Density 940Kg / m 3 85 to 99.5% by mass of polyethylene or more, and (A2) Acid-modified polyethylene 15 to 0.5% by mass wherein the component (A1) has a density of 940 kg / m 3 The polyethylene resin composition according to item [1], wherein the sum of the blending amount of the polyethylene and the blending amount of the acid-modified polyethylene (component (A2))) is 100% by mass. [6]. The component (A) polyethylene resin is (A1) Density 940Kg / m 3 50 to 98.5% by mass of polyethylene or more, (A2) 0.5 to 15% by mass of acid-modified polyethylene, and (A3) Density 940Kg / m 3 Less than 1-35% by mass of polyethylene wherein the component (A1) has a density of 940 kg / m 3 The blending amount of the above polyethylene, the blending amount of the component (A2) acid-modified polyethylene, and the blending amount of the component (A3) density of 940 kg / m3 The polyethylene resin composition according to item [1], wherein the sum of the blending amounts of polyethylenes less than 100% by mass. [7]. The component (A) polyethylene resin is (A3) Density 940Kg / m 3 85 to 99.5% by mass of polyethylene, and (A2) Acid-modified polyethylene 15 to 0.5% by mass wherein the density of the component (A3) is 940 kg / m 3 The polyethylene resin composition according to item [1], wherein the sum of the blending amount of the polyethylene less than 100% by mass and the blending amount of the acid-modified polyethylene as component (A2) is 100% by mass. [8]. The polyethylene resin composition according to item [1], wherein the fine particles of the component (C) infrared-shielding material comprise at least one selected from the group consisting of tungsten oxide fine particles and composite tungsten oxide fine particles. [9]. A film comprising at least one layer formed from the polyethylene resin composition according to any one of items [1] to [8].

[10] .

[0013] A material for agricultural and horticultural facilities, comprising the polyethylene resin composition according to any one of [1] to [8]. [Effects of the Invention]

[0008] In the polyethylene resin composition of the present invention, fine particles of an infrared-shielding material are well dispersed. A preferred polyethylene resin composition of the present invention also has a well-balanced near-infrared shielding property and visible light transmittance, and a film comprising at least one layer formed from the resin composition has a good feel and is easy to process when processed into materials for use in agricultural and horticultural facilities. Therefore, the polyethylene resin composition of the present invention can be suitably used as a material for materials for use in agricultural and horticultural facilities, such as roofing and wall materials for agricultural and horticultural greenhouses and heat-shielding curtains. DETAILED DESCRIPTION OF THE INVENTION

[0009] In this specification, the term "resin" is used to include a resin mixture containing two or more resins, and a resin composition containing components other than resin.

[0010] In this specification, the term "film" is used interchangeably or interchangeably with "sheet." In this specification, the terms "film" and "sheet" are used to refer to materials that can be industrially wound into rolls. The term "plate" is used to refer to materials that cannot be industrially wound into rolls. In addition, in this specification, laminating one layer and another layer in order includes both directly laminating the layers and laminating the layers with one or more additional layers, such as an anchor coat, interposed between them.

[0011] In this specification, the term "more than or equal to" in relation to a numerical range means a certain number or more than a certain number. For example, 20% or more means 20% or more than 20%. The term "less than or equal to" in relation to a numerical range means a certain number or less than a certain number. For example, 20% or less means 20% or less than 20%. Furthermore, the symbol "to" in relation to a numerical range means a certain number, more than a certain number and less than another certain number, or another certain number. Here, another certain number is a number greater than the certain number. For example, 10 to 90% means 10%, more than 10% and less than 90%, or 90%. Furthermore, the upper and lower limits of a numerical range can be arbitrarily combined, and embodiments incorporating such combinations can be interpreted. For example, from a statement regarding the numerical range of a certain characteristic such as "usually 10% or more, preferably 20% or more. On the other hand, it is usually 40% or less, preferably 30% or less," or "usually 10 to 40%, preferably 20 to 30%," it can be read that the numerical range of the certain characteristic is 10 to 40%, 20 to 30%, 10 to 30%, or 20 to 40% in one embodiment.

[0012] Other than in the examples, or where otherwise specified, all numerical values ​​used in the specification and claims should be understood to be modified by the term "about." Without attempting to limit the application of the doctrine of equivalents to the claims, each numerical value should be construed in light of the number of significant digits and by applying ordinary rounding techniques.

[0013] In this specification, terms specifying shapes or geometric conditions, such as parallel, orthogonal, and perpendicular, are intended to include not only the strict meanings but also substantially the same states.

[0014] In this specification, when it is explained that "comprises a certain substance," it is to be understood that, in one embodiment, it contains a certain substance, consists of a certain substance, or consists only of a certain substance. For example, from the explanation that "composition A comprises substances a1 and a2," it is to be understood that, in one embodiment, composition A comprises substances a1 and a2, composition A consists of substances a1 and a2, or composition A consists only of substances a1 and a2.

[0015] 1. Polyethylene resin composition: The polyethylene resin composition of the present invention contains (A) a polyethylene resin, (B) at least one selected from the group consisting of a plasticizer for polyvinyl chloride and a softener for non-aromatic rubber, and (C) fine particles of an infrared-shielding material. Each component will be described below.

[0016] (A) Polyethylene: The polyethylene resin composition of the present invention contains the polyethylene resin component (A). The polyethylene resin component (A) functions to impart to the polyethylene resin composition of the present invention basic properties required for materials used in agricultural and horticultural facilities, such as water resistance and mechanical strength, and also functions to impart processability when the polyethylene resin composition of the present invention is processed into materials used in agricultural and horticultural facilities.

[0017] Examples of the polyethylene resin component (A) include polyethylenes such as linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), very low-density polyethylene (VLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), and ethylene-α-olefin (e.g., propylene, 1-butene, 1-hexene, 1-octene, 4-methyl-1-pentene, etc.) copolymers (including random copolymers and block copolymers), as well as derivatives of the polyethylenes.

[0018] As the polyethylene resin (A) above, one of these may be used alone or in combination with two or more thereof.

[0019] The polyethylene resin component (A) has a density of 940 kg / m3 (A1) from the viewpoints of heat resistance, mechanical strength, and processability when a film made of the polyethylene resin composition of the present invention is processed into materials for use in agricultural and horticultural facilities. 3 The polyethylene component (A1) may contain the above polyethylene. The density of the polyethylene component (A1) is more preferably 945 kg / m 3 More preferably, 950 kg / m 3 More than 955 kg / m 3 On the other hand, the density of the polyethylene component (A1) is preferably 965 kg / m or more from the viewpoint of film formability. 3 Less than or equal to 962 kg / m 3 Here, the density of the polyethylene component (A1) is measured by the water displacement method in accordance with JIS K7112:1999.

[0020] The melt mass flow rate of the polyethylene component (A1), measured in accordance with JIS K7210-1:2014 at a temperature of 190°C and a load of 21.18 N, may be preferably 0.05 to 20 g / 10 min, more preferably 0.1 to 15 g / 10 min, and even more preferably 0.5 to 10 g / 10 min, from the viewpoint of moldability or film-forming ability.

[0021] As the polyethylene resin (A1) above, one of these may be used alone or in combination with two or more thereof.

[0022] In an embodiment in which the component (A) polyethylene resin comprises the component (A1) polyethylene, the blending amount of the component (A1) polyethylene can be appropriately selected taking into consideration the type of material to be used in the agricultural or horticultural facility, and from the viewpoints of heat resistance, mechanical strength, processability when a film made from the polyethylene resin composition of the present invention is processed into a material to be used in the agricultural or horticultural facility, and the feel of the film. The blending amount of the component (A1) polyethylene, based on 100% by mass of the entire component (A) polyethylene resin, may be preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more, from the viewpoints of heat resistance, mechanical strength, and processability when a film made from the polyethylene resin composition of the present invention is processed into a material to be used in the agricultural or horticultural facility. On the other hand, the blending amount of the component (A1) polyethylene may be preferably 100% by mass or less, more preferably 99% by mass or less, even more preferably 95% by mass or less, and even more preferably 90% by mass or less, from the viewpoint of the feel of the film.

[0023] From the viewpoint of better dispersing the fine particles of the infrared-shielding material (C) above, the polyethylene resin (A) may preferably contain an acid-modified polyethylene (A2). The acid-modified polyethylene (A2) is a substance (a derivative of the polyethylene) obtained by modifying one or a mixture of two or more of the polyethylenes above with an unsaturated carboxylic acid (usually by graft-polymerizing the unsaturated carboxylic acid onto the polyethylene).

[0024] The unsaturated carboxylic acid that can be used to produce the component (A2) acid-modified polyethylene is a compound having one or more carbon-carbon double bonds and one or more carboxyl groups (including acid anhydrides) in one molecule. Examples of the unsaturated carboxylic acid include unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, ethacrylic acid, and crotonic acid; unsaturated dicarboxylic acids such as itaconic acid, fumaric acid, and maleic acid; unsaturated dicarboxylic acid monoesters such as maleic acid monoesters, fumaric acid monoesters, and itaconic acid monoesters; and unsaturated dicarboxylic acid anhydrides such as maleic anhydride and itaconic anhydride. The unsaturated carboxylic acid may preferably contain an unsaturated dicarboxylic acid anhydride, more preferably maleic anhydride. The unsaturated carboxylic acid may be one of these or a mixture of two or more of these.

[0025] The component (A2) acid-modified polyethylene may preferably contain unsaturated dicarboxylic acid anhydride-modified polyethylene, and more preferably contain maleic anhydride-modified polyethylene.

[0026] The melt mass flow rate of the acid-modified polyethylene (A2) as described above, measured in accordance with JIS K7210-1:2014 at a temperature of 190°C and a load of 21.18 N, may be preferably 0.05 to 20 g / 10 min, more preferably 0.1 to 15 g / 10 min, and even more preferably 0.5 to 10 g / 10 min, from the viewpoint of moldability or film-forming ability.

[0027] As the component (A2), acid-modified polyethylene, one of these may be used alone or in combination with two or more thereof.

[0028] In an embodiment in which the component (A) polyethylene resin contains the component (A2) acid-modified polyethylene, the amount of the component (A2) acid-modified polyethylene can be appropriately selected from the viewpoints of improving dispersion of the fine particles of the component (C) infrared-shielding material and from the viewpoints of moldability or film-formability. The amount of the component (A2) acid-modified polyethylene, based on 100% by mass of the entire component (A) polyethylene resin, may be preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and even more preferably 1.5% by mass or more, from the viewpoints of improving dispersion of the fine particles of the component (C) infrared-shielding material. On the other hand, the amount of the component (A2) acid-modified polyethylene may be preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less, from the viewpoints of moldability or film-formability.

[0029] In one embodiment, the component (A) polyethylene resin has a density of 940 kg / m (A3) from the viewpoint of the feel of the film. 3 The polyethylene of component (A3) may contain polyethylene of less than 935 kg / m. 3 More preferably, 930 kg / m or less 3 Below 925 kg / m, most preferably 3 On the other hand, the density of the polyethylene component (A3) is preferably 880 kg / m or less from the viewpoints of heat resistance, mechanical strength, and processability when a film made from the polyethylene resin composition of the present invention is processed into materials for use in agricultural and horticultural facilities. 3 More preferably, 900 kg / m 3 More preferably, 905 kg / m 3 More preferably, 910 kg / m 3 The density of the polyethylene component (A3) is measured by the water displacement method in accordance with JIS K7112:1999.

[0030] The melt mass flow rate of the polyethylene component (A3), measured in accordance with JIS K7210-1:2014 at a temperature of 190°C and a load of 21.18 N, may be preferably 0.05 to 20 g / 10 min, more preferably 0.1 to 15 g / 10 min, and even more preferably 0.5 to 10 g / 10 min, from the viewpoint of moldability or film-forming ability.

[0031] As the polyethylene component (A3), one of these may be used alone or in combination with two or more thereof.

[0032] In an embodiment in which the component (A) polyethylene resin contains the component (A3) polyethylene, the amount of the component (A3) polyethylene can be appropriately selected taking into consideration the type of material to be used in the intended agricultural or horticultural facility, from the viewpoints of the feel of the film, heat resistance, mechanical strength, and processability when a film made from the polyethylene resin composition of the present invention is processed into a material to be used in the agricultural or horticultural facility.

[0033] When the objective is to use the polyethylene resin composition as a material for knitted fabrics for heat-shielding curtains, the amount of polyethylene (A3) may be, from the viewpoint of the feel of the film, preferably 1% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more, based on 100% by mass of the polyethylene resin (A) as a whole. On the other hand, the amount of polyethylene (A3) may be, from the viewpoint of heat resistance, mechanical strength, and processability when a film made from the polyethylene resin composition of the present invention is processed into a knitted fabric for heat-shielding curtains, preferably 35% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less.

[0034] When intended as a material for a single film as a heat-shielding curtain, the blending amount of the polyethylene component (A3) may be 100% by mass or less, 99% by mass or less, 95% by mass or less, 90% by mass or less, or from 85 to 100% by mass, from the viewpoints of the feel of the film, heat resistance, and mechanical strength.

[0035] In a more preferred embodiment, the component (A) polyethylene resin may contain the component (A1) polyethylene and the component (A2) acid-modified polyethylene. In this embodiment, the amount of the component (A2) acid-modified polyethylene, relative to the sum of the component (A1) polyethylene and the component (A2) acid-modified polyethylene (combined amount), may be preferably 0.5% by mass or more (99.5% by mass or less of the component (A1)), more preferably 1.0% by mass or more (99.0% by mass or less of the component (A1)), and even more preferably 1.5% by mass or more (98.5% by mass or less of the component (A1)), from the viewpoint of better dispersing the fine particles of the component (C) infrared-shielding material, taken as 100% by mass. On the other hand, from the viewpoint of moldability or film-forming ability, the blending amount of the above-mentioned component (A2), acid-modified polyethylene, may be preferably 15% by mass or less (85% by mass or more of the above-mentioned component (A1)), more preferably 10% by mass or less (90% by mass or more of the above-mentioned component (A1)), and even more preferably 5% by mass or less (95% by mass or more of the above-mentioned component (A1)).

[0036] In another more preferred embodiment, the component (A) polyethylene resin may contain the component (A1) polyethylene and the component (A3) polyethylene. In this embodiment, the amount of the component (A3) polyethylene, where the sum of the amount of the component (A1) polyethylene and the amount of the component (A3) polyethylene is taken as 100% by mass, may be preferably 1% by mass or more (99% by mass or less of the component (A1)), more preferably 5% by mass or more (95% by mass or less of the component (A1)), and even more preferably 10% by mass or more (90% by mass or less of the component (A1)), from the viewpoint of the feel of the film. On the other hand, from the viewpoints of heat resistance, mechanical strength, and processability when a film made from the polyethylene resin composition of the present invention is processed into materials for use in agricultural and horticultural facilities, the blending amount of the polyethylene component (A3) may be preferably 35% by mass or less (65% by mass or more of the component (A1)), more preferably 30% by mass or less (70% by mass or more of the component (A1)), and even more preferably 25% by mass or less (75% by mass or more of the component (A1)).

[0037] In yet another more preferred embodiment, the component (A) polyethylene resin may contain the component (A2) acid-modified polyethylene and the component (A3) polyethylene. In this embodiment, the amount of the component (A2) acid-modified polyethylene, relative to the sum of the amount of the component (A3) polyethylene and the amount of the component (A2) acid-modified polyethylene (component A3) being 100% by mass, may be preferably 0.5% by mass or more (99.5% by mass or less of the component (A3)), more preferably 1.0% by mass or more (99.0% by mass or less of the component (A3)), and even more preferably 1.5% by mass or more (98.5% by mass or less of the component (A3)), from the viewpoint of better dispersing the fine particles of the component (C) infrared-shielding material. On the other hand, from the viewpoint of moldability or film-forming ability, the blending amount of the above-mentioned component (A2) acid-modified polyethylene may be preferably 15% by mass or less (85% by mass or more of the above-mentioned component (A3)), more preferably 10% by mass or less (90% by mass or more of the above-mentioned component (A3)), and even more preferably 5% by mass or less (95% by mass or more of the above-mentioned component (A3)).

[0038] In a more preferred embodiment, the component (A) polyethylene resin may contain the component (A1) polyethylene, the component (A2) acid-modified polyethylene, and the component (A3) polyethylene. In this embodiment, the amount of the component (A1) polyethylene may be preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more, from the viewpoints of heat resistance, mechanical strength, and processability when a film made from the polyethylene resin composition of the present invention is processed into materials for use in agricultural and horticultural facilities. On the other hand, the amount of the component (A1) polyethylene may be preferably 98.5% by mass or less, more preferably 94.0% by mass or less, and even more preferably 88.5% by mass or less, from the viewpoint of the feel of the film. The amount of the component (A2) acid-modified polyethylene may be preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and even more preferably 1.5% by mass or more, from the viewpoint of better dispersing the fine particles of the component (C) infrared-shielding material. On the other hand, from the viewpoint of moldability or film-forming property, the blending amount of the acid-modified polyethylene (A2) may be preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less. From the viewpoint of the feel of the film, the blending amount of the polyethylene (A3) may be preferably 1% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more. On the other hand, from the viewpoints of heat resistance, mechanical strength, and processability when a film made from the polyethylene resin composition of the present invention is processed into materials for use in agricultural and horticultural facilities, the blending amount of the polyethylene (A3) may be preferably 35% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less. Here, the sum of the blending amounts of the polyethylene (A1), the acid-modified polyethylene (A2), and the polyethylene (A3) is 100% by mass.

[0039] (B) Plasticizers, etc.: The polyethylene resin composition of the present invention contains at least one selected from the group consisting of component (B) a plasticizer for polyvinyl chloride and a non-aromatic rubber softener (hereinafter sometimes referred to as "component (B) plasticizer, etc."). The component (B) plasticizer, etc. functions to disperse the fine particles of component (C) an infrared-shielding material well and to improve the feel of the film.

[0040] Examples of the polyvinyl chloride plasticizer used as the component (B) plasticizer include phthalate ester-based plasticizers, trimellitate ester-based plasticizers, pyromellitate ester-based plasticizers, adipate ester-based plasticizers, itaconate ester-based plasticizers, citrate ester-based plasticizers, cyclohexanedicarboxylate-based plasticizers, epoxy-based plasticizers, polyester-based plasticizers, trimellitate-based plasticizers, tetrahydrophthalic acid diester-based plasticizers, glycerin ester-based plasticizers, epoxyhexahydrophthalic acid diester-based plasticizers, isosorbide diester-based plasticizers, phosphate-based plasticizers, azelaic acid-based plasticizers, sebacic acid-based plasticizers, stearic acid-based plasticizers, citric acid-based plasticizers, pyromellitic acid-based plasticizers, biphenyltetracarboxylic acid ester-based plasticizers, and chlorine-based plasticizers.

[0041] Among these, the plasticizer for polyvinyl chloride may preferably contain (B1) an ester of a polycarboxylic acid and a saturated aliphatic alcohol, from the viewpoint of suppressing bleed-out. Here, the saturated aliphatic alcohol refers to a monohydric alcohol having 6 to 22 carbon atoms, and a compound in which the carbon chain is a saturated hydrocarbon chain.

[0042] The polycarboxylic acid used in the preparation of the component (B1) ester is a compound having two or more carboxyl groups (-COOH) in one molecule. Examples of the polycarboxylic acid include aliphatic polycarboxylic acids such as saturated aliphatic polycarboxylic acids, unsaturated aliphatic polycarboxylic acids, and hydroxyl-containing aliphatic polycarboxylic acids, as well as aromatic polycarboxylic acids.

[0043] Examples of the saturated aliphatic polycarboxylic acid include saturated aliphatic dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid.

[0044] Examples of the unsaturated aliphatic polycarboxylic acid include unsaturated aliphatic dicarboxylic acids such as maleic acid, fumaric acid, citraconic acid, and itaconic acid.

[0045] Examples of the hydroxyl group-containing aliphatic polycarboxylic acid include hydroxyl group-containing saturated aliphatic dicarboxylic acids such as malic acid and tartaric acid, and hydroxyl group-containing saturated aliphatic polycarboxylic acids such as hydroxyl group-containing saturated aliphatic tricarboxylic acids such as citric acid.

[0046] Examples of the aromatic polycarboxylic acid include aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, and terephthalic acid, and aromatic tricarboxylic acids such as trimellitic acid.

[0047] As the polycarboxylic acid, one of these or a mixture of two or more thereof can be used.

[0048] Examples of the saturated aliphatic alcohol used in producing the component (B1) ester include linear saturated aliphatic alcohols such as 1-hexanol, 1-octanol, 1-nonanol, 1-decanol, 1-undecyl alcohol, and 1-dodecanol, as well as branched saturated aliphatic alcohols such as 2-ethyl-1-hexanol, 3-methyl-1-octanol, 7-methyl-1-octanol, and 8-methyl-1-nonanol.

[0049] The saturated aliphatic alcohol may preferably have 8 to 12 carbon atoms.

[0050] As the saturated aliphatic alcohol, one of these or a mixture of two or more thereof can be used.

[0051] The ester of component (B1) may preferably contain an ester of a polycarboxylic acid and a saturated aliphatic alcohol having 8 to 12 carbon atoms.

[0052] Examples of the ester of component (B1) include adipic acid diesters such as di-n-hexyl adipate, bis(2-ethylhexyl) adipate, di-n-octyl adipate, diisononyl adipate, di-n-decyl adipate, and diisodecyl adipate; phthalic acid diesters such as di(2-ethylhexyl) phthalate, di-n-octyl phthalate, diisononyl phthalate, diisodecyl phthalate, diundecyl phthalate, ditridecyl phthalate, and dilauryl phthalate; trimellitic acid triesters such as tri(2-ethylhexyl) trimellitate, tri(n-octyl) trimellitate, and tri(isononyl) trimellitate; and cyclohexanedicarboxylic acid diesters such as diisononyl 1,2-cyclohexanedicarboxylate.

[0053] The non-aromatic rubber softener used as the plasticizer or the like of component (B) is a non-aromatic mineral oil (a hydrocarbon compound derived from petroleum, etc.) or synthetic oil (synthetic hydrocarbon compound). Here, "non-aromatic" means that, for mineral oils, they are not classified as aromatic in the classification below (the number of aromatic carbon atoms is less than 30%). For synthetic oils, this means that aromatic monomers are not used.

[0054] Mineral oils used as rubber softeners are mixtures of one or more of paraffin chains, naphthenic rings, and aromatic rings. They are classified as follows: those with 30 to 45% naphthenic ring carbon atoms are called naphthenic; those with 30% or more aromatic carbon atoms are called aromatic; and those that are neither naphthenic nor aromatic and have 50% or more paraffin chain carbon atoms are called paraffinic.

[0055] Examples of the non-aromatic rubber softener include paraffinic mineral oils such as linear saturated hydrocarbons, branched saturated hydrocarbons, and derivatives thereof; naphthenic mineral oils; and synthetic oils such as hydrogenated polyisobutylene, polyisobutylene, and polybutene.

[0056] Among these, the non-aromatic rubber softener may preferably contain (B2) paraffinic mineral oil from the viewpoint of suppressing bleed-out. The number of aromatic carbon atoms contained in the (B2) paraffinic mineral oil may be preferably 20% or less, more preferably 10% or less, and even more preferably 0 to 5%.

[0057] The component (B1) ester and the component (B2) paraffinic mineral oil are characterized by their chemical structures, which have relatively long saturated hydrocarbon chains. Without intending to be bound by theory, this chemical structure is believed to result in strong interactions with the component (A) polyethylene resin. Therefore, despite the component (B1) ester being a plasticizer for polyvinyl chloride and the component (B2) paraffinic mineral oil being a rubber softener, bleed-out is suppressed, and the component (C) infrared-shielding material particles are effectively dispersed, and the film texture is improved. If this theory is correct, the component (B1) polyvinyl chloride plasticizers other than the component (B1) ester and the non-aromatic rubber softeners other than the component (B2) paraffinic mineral oil also have relatively long saturated hydrocarbon chains, which is likely to suppress bleed-out, effectively disperse the component (C) infrared-shielding material particles, and improve the film texture. Here, based on the results of Examples 6 and 7 of the Experimental Examples described below, it is considered that the "relatively long saturated hydrocarbon chain" specifically refers to a saturated hydrocarbon chain having 4 or more carbon atoms, preferably 6 or more carbon atoms, and more preferably 8 or more carbon atoms.

[0058] As the component (B) plasticizer, etc., one of these compounds or a mixture of two or more of them can be used.

[0059] The amount of the component (B) plasticizer, etc., can be appropriately selected from the viewpoints of favorably dispersing the component (C) infrared-shielding material particles, the film's feel, and suppressing bleed-out, taking into consideration the type of component (A) polyethylene-based resin and the amount of component (C) infrared-shielding material particles. From the viewpoints of favorably dispersing the component (C) infrared-shielding material particles and the film's feel, the amount of the component (B) plasticizer, etc., per 100 parts by mass of the component (A) polyethylene-based resin may be typically 0.05 parts by mass or more, preferably 0.1 parts by mass or more, more preferably 0.3 parts by mass or more, even more preferably 0.5 parts by mass or more, and most preferably 0.7 parts by mass or more. From the viewpoint of suppressing bleed-out, the amount may be typically 10 parts by mass or less, preferably 7 parts by mass or less, more preferably 5 parts by mass or less, even more preferably 4 parts by mass or less, and most preferably 3 parts by mass or less.

[0060] The ratio of the amount of the component (B) plasticizer etc. to the amount of the component (C) infrared-shielding material fine particles (component (B) / component (C)) may be preferably 0.1 or more, more preferably 0.3 or more, and even more preferably 0.5 or more, from the viewpoint of favorable dispersion of the component (C) infrared-shielding material fine particles. On the other hand, the ratio may be preferably 20 or less, more preferably 15 or less, even more preferably 10 or less, and even more preferably 5 or less.

[0061] (C) Microparticles of infrared shielding material: The polyethylene resin composition of the present invention contains the above-mentioned component (C) fine particles of the infrared-shielding material. The above-mentioned component (C) fine particles of the infrared-shielding material function to efficiently absorb or reflect near-infrared rays of sunlight, thereby blocking heat rays.

[0062] The fine particles of the component (C) infrared-shielding material are not particularly limited as long as they are fine particles of a substance having such a function (heat ray-shielding function). Examples of the fine particles of the component (C) infrared-shielding material include fine particles of substances such as tungsten oxides such as tungsten trioxide, composite tungsten oxides such as cesium-doped tungsten oxide, tin-doped indium oxide, antimony-doped tin oxide, aluminum-doped zinc oxide, gallium-doped zinc oxide, titanium oxide, niobium-doped titanium oxide, and lanthanum hexaboride.

[0063] Among these, the fine particles of the infrared-shielding material (C) may contain one or more types selected from the group consisting of tungsten oxides and composite tungsten oxides, from the viewpoint of improving the balance between near-infrared shielding properties and visible light transmittance.

[0064] The average particle size of the fine particles of the infrared-shielding material (C) may be preferably 800 nm or less, more preferably 400 nm or less, even more preferably 300 nm or less, still more preferably 200 nm or less, and most preferably 100 nm or less, from the viewpoint of visible light transmittance. On the other hand, the average particle size of the fine particles of the infrared-shielding material (C) may be preferably 1 nm or more, more preferably 5 nm or more, and even more preferably 10 nm or more, from the viewpoint of productivity in producing the polyethylene resin composition of the present invention.

[0065] In this specification, the average particle size of the microparticles is calculated from the maximum diameter of the microparticles observed using a scanning electron microscope. Specifically, 50 microparticles are randomly selected for observation, the maximum diameters thereof are determined, and the number average value thereof is calculated.

[0066] As the fine particles of the infrared shielding material (C) above, one of these or a mixture of two or more thereof can be used.

[0067] The amount of the microparticles in the infrared-shielding material (component (C)) can be appropriately selected from the viewpoint of maintaining visible light transmittance while taking into consideration the desired level of heat-shielding function. The amount of the microparticles in the infrared-shielding material (component (C)) may be typically 0.01 parts by mass or more, preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.3 parts by mass or more, relative to 100 parts by mass of the polyethylene resin (component (A)). On the other hand, from the viewpoint of maintaining visible light transmittance, the amount of the microparticles in the infrared-shielding material (component (C))) may be typically 10 parts by mass or less, preferably 7 parts by mass or less, more preferably 5 parts by mass or less, even more preferably 3 parts by mass or less, and most preferably 2 parts by mass or less.

[0068] (D) UV absorber: In one preferred embodiment, the polyethylene resin composition of the present invention may further contain (D) an ultraviolet absorber. By including the ultraviolet absorber (D), it is possible to improve the color stability over time and the weather resistance.

[0069] Examples of the component (D) ultraviolet absorber include benzotriazole-based ultraviolet absorbers, triazine-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, cyanoacrylate-based ultraviolet absorbers, aromatic benzoate-based ultraviolet absorbers, and anilide oxalate-based ultraviolet absorbers.

[0070] Examples of the benzotriazole-based ultraviolet absorbers include 2-(5-chloro-2H-benzotriazole-2-yl)-4-methyl-6-tert-butylphenol, 2-(2H-benzotriazole-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol, 2,2'-methylenebis[6-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol], and 2-(2H-benzotriazole-2-yl)-p-cresol.

[0071] Examples of the triazine-based ultraviolet absorber include 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoyloxy)ethoxy]phenol and 2,4,6-tris(2-hydroxy-4-hexyloxy-3-methylphenyl)-1,3,5-triazine.

[0072] Examples of the benzophenone-based ultraviolet absorbers include [2-hydroxy-4-(octyloxy)phenyl](phenyl)methaneone, 2,2',4,4'-tetrahydroxybenzophenone, and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone.

[0073] Examples of the cyanoacrylate ultraviolet absorber include ethyl-2-cyano-3,3-diphenylacrylate, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, and pentaerythritol tetrakis(3,3-diphenyl-2-cyanoacrylate).

[0074] Examples of the aromatic benzoate-based ultraviolet absorbers include 4-tert-butylphenyl salicylate, 4-octylphenyl salicylate, resorcinol monobenzoate, 2,4-ditert-butylphenyl-3,5-ditert-butyl-4-hydroxybenzoate, and hexadecyl-3,5-ditert-butyl-4-hydroxybenzoate.

[0075] Examples of the oxalic acid anilide ultraviolet absorbers include 2-ethyl-2'-ethoxyoxanilide and 2-ethoxy-4'-dodecyloxanilide.

[0076] As the component (D) ultraviolet absorber, one of these compounds or a mixture of two or more of them can be used.

[0077] The amount of the ultraviolet absorber (D) is not particularly limited since it is an optional component. From the viewpoints of color stability over time and weather resistance, the amount of the ultraviolet absorber (D) may be typically 0.01 parts by mass or more, preferably 0.1 parts by mass or more, more preferably 0.4 parts by mass or more, and even more preferably 0.8 parts by mass or more, per 100 parts by mass of the polyethylene resin (A) above. On the other hand, from the viewpoint of preventing the ultraviolet absorber (D) from bleeding out onto the film surface, the amount may be typically 10 parts by mass or less, preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less.

[0078] The polyethylene resin composition of the present invention may further contain optional components other than the above components (A) to (D), as desired, to the extent that the object of the present invention is not adversely affected. Examples of the optional components include thermoplastic resins other than the above component (A) and additives commonly used in polyethylene.

[0079] Examples of the thermoplastic resin as an optional component include ethylene-unsaturated carboxylic acid copolymers such as ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-(meth)acrylic acid alkyl ester copolymer such as ethylene-ethyl methacrylate copolymer; polypropylenes such as propylene homopolymers and propylene-α-olefin copolymers (including random copolymers and block copolymers); ethylene-vinyl acetate copolymer, polybutene, and polypentene; and thermoplastic elastomers such as styrene-based thermoplastic elastomers and olefin-based thermoplastic elastomers.

[0080] Examples of the additives as optional components include antioxidants, neutralizing agents, slip agents, antiblocking agents, antifogging agents, antistatic agents, light resistance stabilizers, nucleating agents, inorganic colorants, organic colorants, and masterbatches for dry blending of these additives.

[0081] Examples of the antioxidant include hindered phenol-based antioxidants, phosphite-based antioxidants, and thioether-based antioxidants.

[0082] Examples of the neutralizing agent include fatty acid metal salts such as calcium stearate, zinc stearate, and magnesium stearate, hydrotalcites, and composite metal hydroxides such as lithium aluminum composite hydroxide.

[0083] Examples of the slip agent include fatty acid amides such as erucic acid amide, oleic acid amide, stearic acid amide, behenic acid amide, ethylene bisstearic acid amide, ethylene bisoleic acid amide, stearyl erucamide, and oleyl palmitamide.

[0084] Examples of the anti-blocking agent include inorganic fine particles such as silica, and organic fine particles such as cross-linked acrylic resin.

[0085] As the optional component, one or more of these may be used.

[0086] The amount of the optional components is not particularly limited as long as it does not detract from the object of the present invention. In one embodiment, the amount of the optional components may be 20 parts by mass or less, 15 parts by mass or less, 10 parts by mass or less, 7 parts by mass or less, 5 parts by mass or less, 4 parts by mass or less, 3 parts by mass or less, 2 parts by mass or less, 1 part by mass or less, 0.5 parts by mass or less, 0 to 0.5 parts by mass, or about 0.01 to 20 parts by mass, relative to 100 parts by mass of the polyethylene resin (A).

[0087] In one embodiment, the polyethylene resin composition of the present invention may not contain any one or more of the optional components described above.

[0088] As used herein, "not containing a certain component" means that the component is not intentionally blended. In the technical field of resin compositions, when a component is intentionally blended, it is typically blended in an amount of 0.01 part by mass or more. Therefore, "not containing a certain component" can also be rephrased as meaning that the content of the component is typically less than 0.01 part by mass, preferably 0.001 part by mass or less, and more preferably 0 to 0.0001 part by mass, per 100 parts by mass of the polyethylene resin (A) described above.

[0089] The polyethylene resin composition of the present invention can be obtained by using any melt kneader to charge the above components (A) to (C) and any optional components used as desired into the melt kneader simultaneously or in any order and melt kneading them, preferably at a resin temperature of 200 to 240°C.

[0090] Examples of the melt kneader include batch kneaders such as pressure kneaders and mixers, extrusion kneaders such as single-screw extruders, co-rotating twin-screw extruders, and counter-rotating twin-screw extruders, and calendar roll kneaders. These may be used in any combination.

[0091] The resulting polyethylene resin composition can be pelletized by any method and then molded into any article by any method, such as hot cutting, strand cutting, or underwater cutting.

[0092] Alternatively, the resulting polyethylene resin composition may be directly subjected to film formation or molding (without going through a pelletizing step).

[0093] 2.Film: The film of the present invention is a film including at least one layer formed from the polyethylene resin composition of the present invention. In one embodiment, the film of the present invention may be a monolayer film. In another embodiment, the film of the present invention may be a multilayer film. In yet another embodiment, the film of the present invention may be a multilayer film in which both outer layers are formed using virgin materials of the polyethylene resin composition of the present invention, and the intermediate layer is formed using a mixture of virgin materials of the polyethylene resin composition of the present invention and recycled materials such as film selvages (cut portions on both ends that exceed the set range in the width direction generated during film production).

[0094] The thickness of the film of the present invention is not particularly limited and can be appropriately selected taking into consideration the specific type of agricultural and horticultural facility material of interest and its usage mode. The thickness of the film of the present invention may usually be 10 to 500 μm, preferably 20 to 300 μm, and more preferably 30 to 200 μm. Here, the thickness means the thickness of the entire film including at least one layer formed from the polyethylene resin composition of the present invention (when the film consists of multiple layers, the total thickness of those layers).

[0095] The method for producing the film of the present invention is not particularly limited, and known film production methods can be used. Examples of the film production method include a method for producing a film using a calender roll rolling film production device equipped with a calender roll rolling processing machine and a take-up device; a method for producing a film using a T-die film production device equipped with an extruder, a T-die and a take-up device; and a method for producing a film using an inflation film production device equipped with an extruder, a circular die, an inflation device and a take-up device having a nip mechanism.

[0096] 3. Agricultural and horticultural facility materials: The material for an agricultural or horticultural facility of the present invention comprises the polyethylene resin composition of the present invention. In one typical embodiment, the material for an agricultural or horticultural facility of the present invention comprises a film (i.e., the film of the present invention) comprising at least one layer formed from the polyethylene resin composition of the present invention.

[0097] Examples of agricultural and horticultural facility materials of the present invention include roofing materials and wall materials for agricultural and horticultural greenhouses, and heat-shielding curtains.

[0098] Examples of the heat-shielding curtain include a single sheet of heat-shielding film, and a knit of the heat-shielding film cut into strips and spun yarn or strips of other material. Examples of other materials include, but are not limited to, single or multiple types of resin film, typically polyethylene film (transparent film, or film optionally colored with a pigment such as metal oxide). [Example]

[0099] The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

[0100] Measurement method The following tests (a) to (e) were carried out after conditioning the test specimens in an environment of 23±2°C temperature and 50±10% humidity for 16 hours or more, and then under the same temperature and humidity conditions unless otherwise specified.

[0101] (a) Film appearance: The surface of the film was visually observed by shining fluorescent light onto the surface at various angles of incidence, and the size of the foreign matter measurement chart of the National Printing Bureau was 0.1 mm. 2 The number of foreign particles or fish eyes larger than the figure was counted and evaluated according to the following criteria: Rank B or higher is preferable, and Rank A is more preferable. A: 1m of film 2 There were less than 10 of them. B: 1m of film 2 There were more than 10 and less than 20. C: 1m of film 2 There were more than 20 and less than 30 of them. D: 1m of film 2 Medium 30 pieces or more

[0102] (b) Hardness: In accordance with JIS K 6253-2012, a 6.3 mm thick press sheet prepared using the resin composition was used as a test piece, and the 5-second value of the durometer hardness (type D) was measured.

[0103] (c) Flexural modulus: In accordance with JIS K7171:2016, a 4.0 mm thick press sheet was prepared using the resin composition, and the press sheet was punched out to obtain a rectangular parallelepiped molded product having a length of 80 mm, a width of 10.0 mm, and a thickness of 4.0 mm. This was used as a test piece, and a bending test was carried out under conditions of a support distance of 64 mm and a test speed of 2 mm / min (the same test speed was maintained even after the range for determining the elastic modulus was exceeded), and the flexural modulus (unit: MPa) was calculated.

[0104] (d) Film texture: The feel of the film was evaluated according to the following criteria. H: It felt hard and rough to the touch. M: It was flexible and had a moderate rigidity, and felt good to the touch. S: It was soft and sticky to the touch.

[0105] The flexural modulus and film texture are not particularly limited, and can be appropriately selected taking into consideration the specific type of agricultural and horticultural facility material of interest and its usage. When the film is intended as a knitted material for a heat-shielding curtain, the flexural modulus may be preferably 600 to 1000 MPa, more preferably 650 to 950 MPa, from the viewpoint of smoothly performing processing such as cutting the film into strips and knitting and weaving with spun yarn using a knitting machine such as a Russell knitting machine. The film texture may preferably be Category M.

[0106] When the film is intended to be used as a single sheet material for a heat-shielding curtain, the flexural modulus may be preferably 100 to 500 MPa, more preferably 150 to 400 MPa, from the viewpoint of the feel of the film. The feel of the film may preferably be Category S.

[0107] When the film is intended for use as a material requiring rigidity, such as a plate, the flexural modulus may be preferably 1000 MPa or more, more preferably 1200 MPa or more. The film's hand feel may preferably be Category H.

[0108] (e) Light transmittance: Using a Shimadzu Corporation spectrophotometer "SolidSpec-3700 (product name)," the film was used as a test specimen, and the light transmittance (unit: %) was read from the spectrum measured at an incident angle of 0° at wavelengths of 450 nm, 650 nm, and 900 nm.

[0109] Figure 1 shows the transmission spectrum measured by the above-mentioned test (e) Light Transmittance method for the film of Example 1. It can be seen that the film of Example 1 transmits approximately 80% or more of the light required for the growth of agricultural and horticultural crops (mainly visible light with wavelengths of 400 to 500 nanometers and 600 to 700 nanometers), while the transmittance of near-infrared light is approximately 60% or less (blocking rate is approximately 40% or more).

[0110] Raw materials used (A) Polyethylene resin: (A1) Density 940Kg / m 3 Polyethylene above: (A1-1) High-density polyethylene "Nobatec HD HY531 (trade name)" from Japan Polyethylene Co., Ltd., melt flow rate (190°C, 21.18N) 0.6g / 10min, density 958kg / m 3 , melting point 135℃, enthalpy of fusion 228J / g. (A1-2) High-density polyethylene "Nobatec HD HF335 (product name)" from Japan Polyethylene Co., Ltd., melt flow rate (190°C, 21.18N) 1.0g / 10min, density 949kg / m 3 , melting point 133℃, enthalpy of fusion 195J / g.

[0111] (A2) Acid-modified polyethylene: (A2-1) Mitsui Chemicals, Inc.'s acid-modified polyethylene "Admer NF528 (trade name)", melt flow rate (190°C, 21.18N) 2.2g / 10min, density 906kg / m 3 , melting point 120℃, enthalpy of fusion 115J / g.

[0112] (A3) Density 940Kg / m 3 Less than polyethylene: (A3-1) Linear low-density polyethylene "UF442 (trade name)" from Japan Polyethylene Co., Ltd., melt flow rate (190°C, 21.18N) 1.7g / 10min, density 924kg / m 3 , melting point 123°C, enthalpy of fusion 138 J / g. (A3-2) Prime Polymer Co., Ltd.'s linear low-density polyethylene "Ultzex ​​1520L (trade name)", melt flow rate (190°C, 21.18N) 2.3g / 10min, density 914kg / m 3 , melting point 119°C, enthalpy of fusion 112 J / g.

[0113] (B) Plasticizers, etc.: (B1) Esters of polycarboxylic acids and saturated aliphatic alcohols: (B1-1) Diisodecyl adipate "DIDA (trade name)" from Taoka Chemical Co., Ltd. (B1-2) Diisononyl phthalate "DINP (trade name)" from J-Plus Corporation. (B1-3) BASF Japan Ltd.'s 1,2-cyclohexanedicarboxylate diisononyl "Hexamoll® DINCH (trade name)". (B1-4) Triisononyl trimellitate "ADEKA Cizer C-9N (trade name)" from ADEKA Corporation.

[0114] (B2) Paraffinic mineral oil: (B2-1) Paraffin oil "Diana Process Oil PW-90 (product name)" from Idemitsu Kosan Co., Ltd.

[0115] (B3) Component (B) other than the above component (B1) and the above component (B2), such as a plasticizer: (B3-1) ADEKA Corporation's adipic acid polyester plasticizer "ADEKA Cizer PN-7160 (product name)." (B3-2) Di(2-butoxyethyl) adipate, CAS number 141-18-4.

[0116] (C) Microparticles of infrared shielding material: (C-1) Cesium-doped tungsten oxide microparticles "YMDS-874 (trade name)" from Sumitomo Metal Mining Co., Ltd., a microparticle powder with an active ingredient ratio of 23% by mass. (C-2)) Toyocolor Co., Ltd.'s dispersion of tin-doped indium oxide microparticles "RTP-1485 (product name)", with a tin-doped indium oxide microparticle content of 40% by mass.

[0117] (D) UV absorber: (D-1) ADEKA Corporation's benzophenone-based ultraviolet absorber "ADEKA STAB 1413 (trade name)."

[0118] Example 1 (1) Preparation of resin composition: A blend consisting of 78.0 parts by mass of the component (A1-1), 2.0 parts by mass of the component (A2-1), 20.0 parts by mass of the component (A3-1), 1.00 part by mass of the component (B1-1), 2.61 parts by mass of the component (C-1) (0.60 parts by mass of the active ingredient, equivalent to cesium-doped tungsten oxide), and 1.00 part by mass of the component (D-1) was melt-kneaded using a twin-screw extrusion kneader at a die outlet resin temperature of 200°C to obtain a resin composition. (2) Film production: Using a T-die film-forming device equipped with an extruder, a T-die, and a take-up device, a film having a thickness of 50 μm was formed using the resin composition obtained in (1) above at a T-die outlet resin temperature of 220°C. (3) Rating: The resin composition obtained in (1) above or the film obtained in (2) above was used to carry out the above tests (A) to (E). The results are shown in Table 1. The amount of component (C-1) added is shown in the table as the value calculated as the active ingredient in terms of cesium-doped tungsten oxide.

[0119] Examples 2-20 A resin composition and a film were obtained in the same manner as in Example 1, except that the formulation was changed as shown in Table 1 or 2. The above tests (A) to (E) were carried out. The results are shown in Table 1 or 2. The amount of the component (C-1) listed in the table is the value calculated as the active ingredient, cesium-doped tungsten oxide. The amount of the component (C-2) listed in the table is the value calculated as the active ingredient, tin-doped indium oxide.

[0120] [Table 1]

[0121] [Table 2]

[0122] It was found that the polyethylene resin composition of the present invention has well-dispersed fine particles of an infrared-shielding material. It was also found that a preferred polyethylene resin composition of the present invention has a good balance between near-infrared shielding properties and visible light transmittance. Therefore, it was considered that the polyethylene resin composition of the present invention can be suitably used as a material for materials used in agricultural and horticultural facilities, such as roofing and wall materials for agricultural and horticultural greenhouses and heat-shielding curtains. Furthermore, it was considered that a polyethylene resin composition according to a more preferred embodiment of the present invention can be suitably used as a material for the knitted fabric used as a heat-shielding curtain, based on its flexural modulus and the feel of the film obtained by forming the composition. It was considered that a polyethylene resin composition according to another more preferred embodiment of the present invention can be suitably used as a material for the single film used as a heat-shielding curtain, based on its flexural modulus and the feel of the film obtained by forming the composition. It was considered that a still further polyethylene resin composition according to a more preferred embodiment of the present invention can be suitably used as a material for materials requiring rigidity, such as plate materials, based on its flexural modulus and the feel of the film obtained by forming the composition. [Brief explanation of the drawings]

[0123] [Figure 1] 1 is a transmission spectrum of the film of Example 1.

Claims

1. (A) 100 parts by mass of polyethylene resin, (B) 0.01 to 10 parts by mass of at least one selected from the group consisting of plasticizers for polyvinyl chloride and non-aromatic rubber softeners, and (C) Infrared shielding material fine particles: 0.01 to 10 parts by mass A polyethylene resin composition comprising:

2. 2. The polyethylene resin composition according to claim 1, wherein the component (B) comprises (B1) an ester of a polycarboxylic acid and a saturated aliphatic alcohol.

3. 3. The polyethylene resin composition according to claim 2, wherein the component (B1) ester of a polycarboxylic acid and a saturated aliphatic alcohol comprises an ester of a polycarboxylic acid and a saturated aliphatic alcohol having 8 to 12 carbon atoms.

4. 2. The polyethylene resin composition according to claim 1, wherein the component (B) comprises (B2) a paraffinic mineral oil.

5. The component (A) polyethylene resin is (A1) Density 940Kg / m ３ 85 to 99.5% by mass of the above polyethylene, and (A2) Acid-modified polyethylene 15 to 0.5% by mass wherein the component (A1) has a density of 940 kg / m ３ 2. The polyethylene resin composition according to claim 1, wherein the sum of the blend amount of the polyethylene and the blend amount of the acid-modified polyethylene (A2) is 100% by mass.

6. The component (A) polyethylene resin is (A1) Density 940Kg / m ３ 50 to 98.5% by mass of the above polyethylene, (A2) 0.5 to 15% by mass of acid-modified polyethylene, and (A3) Density 940Kg / m ３ 1 to 35% by mass of polyethylene wherein the component (A1) has a density of 940 kg / m ３ The blending amount of the above polyethylene, the blending amount of the component (A2) acid-modified polyethylene, and the blending amount of the component (A3) density 940 kg / m ３ The polyethylene resin composition according to claim 1 , wherein the sum of the blend amounts of polyethylenes less than 100% by mass is 100% by mass.

7. The component (A) polyethylene resin is (A3) Density 940Kg / m ３ 85 to 99.5% by weight of polyethylene, and (A2) Acid-modified polyethylene 15 to 0.5% by mass wherein the component (A3) has a density of 940 kg / m ３ The polyethylene resin composition according to claim 1, wherein the sum of the amount of the polyethylene blended of less than 100% by mass and the amount of the acid-modified polyethylene blended as component (A2) is 100% by mass.

8. 2. The polyethylene resin composition according to claim 1, wherein the fine particles of the component (C) infrared-shielding material comprise at least one selected from the group consisting of tungsten oxide fine particles and composite tungsten oxide fine particles.

9. A film comprising at least one layer formed from the polyethylene resin composition according to any one of claims 1 to 8.

10. A material for agricultural and horticultural facilities, comprising the polyethylene resin composition according to any one of claims 1 to 8.

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