JPH09111111A - Antifogging resin composition and agricultural film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hydrophilic polymer composition excellent in initial drop flow properties and their retention and to obtain an agricultural film. SOLUTION: This antifogging resin composition is prepared by kneading 100 pts.wt. mixture of 5-90wt.% hydrophilic polymer having a polyether group and a number-average molecular weight of 1,000-500,000 and 95-10wt.% olefin resin and 0.05-5 pts.wt. nonionic surfactant.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an antifogging resin composition and an agricultural film used for greenhouses, tunnel cultivation and the like.

[0002]

2. Description of the Related Art Polyvinyl chloride or branched low-density polyethylene, ethylene-vinyl acetate copolymer, linear low-density polyethylene, and other ethylene-based resins are used as base materials for agricultural films used in greenhouses and tunnel cultivation. A soft plastic film having a thickness of 30 to 200 μm is mainly used. Inside the house and tunnel covered with these films, the water vapor is saturated with water vapor evaporating from the ground and plants, and this water vapor condenses on the inner surface of the film and adheres as water droplets. When water drops adhere, the diffused reflection not only greatly reduces the incident sunlight, but also drops the water drops to wet the crops and cause diseases.
For this reason, generally, a film is subjected to a so-called water drop prevention (hereinafter referred to as “droplet”) treatment for forming a water film of the attached water drops. Currently, by using this dripping film that has been subjected to this dripping process, the sunlight that penetrates into the house and tunnel is increased, the internal ground temperature and temperature are raised, photosynthesis is increased, and vegetation crops are in a healthy state. And promote the prevention of diseases.

The conventional methods of dripping are stearic acid monoglyceride, sorbitol mono, di-
A kneading method such as stearides is kneaded into a resin for a base material to form a film to form a film, and a kneading method for a kneading agent (Japanese Patent Laid-Open Nos. 52-102130 and 54-99181) and a film forming method. A method of applying a coating type drip agent such as a polymer of polyvinyl alcohol or hydroxymethacrylate on the film surface after the film formation (JP-A-7-82398, Japanese Patent Publication No. 1-21).
No. 172, Japanese Patent Publication No. 64-2158, No. 62-1822
4) is known. On the other hand, as a method for imparting antistatic property to polyolefin, a resin composition comprising polyether ester amide and polyolefin (JP-A-58-1)
18838), a resin composition comprising a polyetheresteramide and an acid anhydride-modified polyolefin (JP-A-3-2).
90464) has been proposed.

[0004]

According to the conventional method of kneading a dropping agent into a resin for a substrate, the initial wettability is good,
Since the dropping agent has a low molecular weight, it migrates to the surface and escapes. In addition, the method of applying a drip agent to the film surface after film formation is such that the drip agent is washed away by water droplets generated from water vapor generated by carbonic acid assimilation of crops and disappears within 2-3 months from the film surface. Therefore, there is a problem that the dropping agent has to be applied again to the surface of the film from which the dropping effect has been lost by using a power sprayer or a brush, or the applied surface is easily scratched and the durability of wetting varies. There is a problem that the equipment for coating is expensive, and the number of film manufacturing processes is increased.

On the other hand, the films made of the resin compositions disclosed in JP-A-58-118838 and JP-A-3-290464 have excellent coating durability, but have a drawback that it takes time before the initial coating. . The present invention aims to provide an anti-fogging resin composition and an agricultural film which are excellent in both initial flowability and long-term flowability, without the need for a complicated step during film production and a secondary step for maintaining flow performance. And

[0006]

According to the present invention, a hydrophilic polymer having a polyether group and a number average molecular weight of 1,000 to 500,000 is 5 to 90% by weight, and an olefin resin is 95 to
The above object is achieved by kneading 10% by weight and 0.05 to 5 parts by weight of a nonionic surfactant with 100 parts by weight of both.

[0007]

[Function] By including a hydrophilic polymer in the anti-fogging layer part of the agricultural film, secondary processing after film formation such as coating type is not required, and polyether polymer and surfactant are used in combination. Thus, both initial drip property and long-term drip property can be exhibited.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

(A) Hydrophilic Polymer Having Polyether Group Examples of the hydrophilic polymer having a polyether group include polyalkylene oxides such as polyethylene oxide, polypropylene oxide, pluorane and polytetramethylene oxide, polyether ester amides and polyether amides. Imide, ethylene oxide / epichlorohydrin copolymer, methoxy polyethylene glycol (meth) acrylate copolymer, polyether ester, polyether group-containing ethylene / vinyl acetate copolymer (ethylene oxide adduct of ethylene / vinyl alcohol copolymer), A hydrophilic polymer having a number average molecular weight of 1,000 to 500,000, preferably 10,000 to 200,000, such as an ethylene oxide adduct of nonylphenol, can be used. These are commercially available as permanent antistatic agents and the structural formula of one example is shown below.

[0009]

Embedded image

The hydrophilic polymer of the present invention is not limited to the above compounds, and a multiblock body having these segments can be used. Among these, polyether ester, polyether ester amide, and polyether amide imide having a polyether group in the molecular chain are preferable, and polyether ester amide is particularly preferable because it has excellent compatibility with the olefin resin. The polyether moiety contained in the polyether ester, polyether ester amide, polyether amide imide, and polyether-containing ethylene / vinyl acetate copolymer includes ethylene glycol, putanediol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and the like. Although it is obtained from diols, polyethylene glycol is preferable among these.

The number average molecular weight of the ether moiety is 2,000.
The following is preferable, and if the number average molecular weight is 2,000 or more, the transparency of the hydrophilic polymer deteriorates, which is not preferable. The weight of the ether portion in the hydrophilic polymer is preferably 20 to 50% by weight. If it is less than 20% by weight, hydrophilicity is poor, and if it exceeds 50% by weight, mechanical strength is poor. The ester moiety may be obtained from an aliphatic dicarboxylic acid having an arbitrary carbon number such as adipic acid or sebacic acid, or a dicarboxylic acid such as an aromatic dicarboxylic acid such as terephthalic acid or isophthalic acid. The amide moiety may be obtained from an amine component capable of forming a polyamide such as caprolactam, or may be obtained from any diamine and any dicarboxylic acid.

The ethylene / vinyl acetate copolymer to which the alkylene oxide is added may have any density and vinyl acetate content, but due to heat resistance and moldability, the vinyl acetate content is 0.5 to 25% by weight. %, Melt flow rate (1
90 ° C., 2.16 kg load) 3 to 10 g / 10 minutes is preferable. The number average molecular weight of the hydrophilic polymer is 1,000 to 50.
50,000 can be used, but the number average molecular weight is 1
Those of 10,000 to 200,000 are preferable. If the number average molecular weight is less than 1,000, the hydrophilic polymer will escape to the outside with time, as in the case of kneading with a dropping agent. When the number average molecular weight exceeds 500,000, the transparency of the hydrophilic polymer is impaired, which is not preferable.

(B) Olefin Resin The olefin resin has a density of 0.900 to 0.9.
High-pressure low density polyethylene 42 g / cm ^3, linear low density polyethylene having a density of 0.88~0.942g / cm ^3, a vinyl acetate content of 0.5 to 25 wt% of an ethylene-vinyl acetate copolymer , Ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer, ethylene / butyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene resin such as Surlyn, polypropylene, propylene / ethylene copolymer A polymer, a homopolymer of α-olefin such as a propylene / butene-1 / ethylene copolymer, or a copolymer with a different monomer can be used. Among them, the density is 0.900 to 0.942g
/ Cm ³ of high-pressure low-density polyethylene and ethylene / vinyl acetate copolymer are preferable because the adhesive strength with the ethylene resin of the other layer is high.

The content of the hydrophilic polymer in the total 100% by weight of the hydrophilic polymer and the olefin resin in the antifogging film layer is 90 to 5% by weight, preferably 50 to 15% by weight.
It is. If the blending amount exceeds 90%, the film strength will be low, and when forming a multilayer inflation film, the adhesion with other layers will be deteriorated and the transparency will be extremely deteriorated. In addition, the material cost becomes high. 5% by weight
If the amount is less than the range, the amount of the hydrophilic polymer appearing on the surface is extremely small, so that the flowability deteriorates.

(C) Surfactant Examples of the nonionic surfactant used in the present invention include glycerin monolaurate, glycerin monopalmitate, glycerin monostearate, diglycerin monolaurate, diglycerin monopalmitate. Glycerin-based surfactants such as diglycerin monostearate and triglycerin monostearate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monobehenate, esters of sorbitan and alkylene glycol condensates and higher fatty acids Sorbitan surfactant, polyethylene glycol monopalmitate, polyethylene glycol monostearate, polyethylene glycol surfactant such as polyethylene glycol alkyl phenyl ether ether, trimethyl Trimethylolpropane surfactant such as roll propane monostearate, pentaerythritol monopalmitate,
Pentaerythritol monostearate, dipentaerythritol monostearate and other pentaerythritol-based surfactants, lauric acid, palmitic acid, amide-based surfactants such as condensation products of stearic acid and diethanolamine, perfluoroalkylethylene oxide adducts And fluorine-containing surfactants, and silicone-based surfactants such as alkylene oxide adducts of organopolysiloxanes. These surfactants may be used alone or as a mixture of two or more kinds.

As the nonionic surfactant, those having a number average molecular weight of less than 1000 are generally used. The blending amount of the surfactant is 0.05 to 5 parts by weight, preferably 0.5 to 3 parts by weight, based on 100 parts by weight of the total of the hydrophilic polymer and the olefin resin. If the blending amount is 0.05 parts by weight or less, the initial flowability is insufficient, and if it exceeds 5 parts by weight, the transparency of the film is deteriorated. Further, the surfactant is not limited to only one layer in a multilayer film of two or more layers,
You may mix | blend with all layers.

Of these, preferred are glycerin monopalmitate, glycerin monostearate, diglycerin monopalmitate, diglycerin monostearate, sorbitan monopalmitate, sorbitan monostearate, polyoxyethylene sorbitan monopalmitate, One or a mixture of two or more selected from polyoxyethylene sorbitan monostearate, palmitic acid, a condensation product of stearic acid and diethanolamine.

(D) Compatibilizer A compatibilizer for increasing the affinity between the hydrophilic resin and the olefin resin is a carboxylic acid group, a carboxylic acid ester group, an acid anhydride group, an acid amide group, in the molecule, Examples thereof include those having a compound containing an imide group, a halogen group, an epoxy group, an amino group, a hydroxyl group, a carbon-carbon double bond or a triple bond, and the like. In general, since olefin resins do not have functional groups, the method of using a functionalized olefin resin modified with the polar group as a compatibilizer is to increase the affinity between the hydrophilic resin and the olefin resin. This is an effective means. Among the above, the compatibilizing agent is preferably an acid anhydride-modified polyolefin modified with an epoxy group-containing vinyl monomer, or a polyolefin such as wax. The amount of the compatibilizer is 0.1 to 10 parts by weight based on 100 parts by weight of the hydrophilic polymer and the olefin resin. If the blending amount is 0.1 parts by weight or less, the hydrophilic polymer and the olefin resin are not compatibilized, and the transparency of the film is poor.
If it exceeds 10 parts by weight, the relative amount of the hydrophilic polymer decreases, which leads to deterioration of the drop property, which is not preferable.

Laminated layer The agricultural film may have a single layer structure as an antifogging film, but a multilayer structure having two or more layers is preferable in terms of cost and transparency. The other layer is preferably an ethylene resin from the viewpoint of cost. As the ethylene-based resin, the ethylene-based resin described in the section (A) Olefin-based resin can be used. The thickness of the antifogging film layer is 5 to 30 μm, preferably 5 to 20 μm, and the thickness of the entire agricultural film is 30 to 200 μm.

Preferably, the structure has three or more layers, and the innermost layer is an antifogging film layer intermediate layer containing 0.5 to 5% by weight of a heat retaining agent (for example, borosilicate glass, phosphosilicate gas, hydrotalcites). The outermost layer is preferably a layer containing 0.5 to 2% by weight of an ultraviolet absorber. Other,
Various stabilizers, lubricants, colorants, dispersants, fillers, nucleating agents, far infrared absorbers and the like may be incorporated in each film. Multilayer film is usually inflation coextrusion method,
It is formed by a T-die method, a calender method, an outside-die laminating extrusion laminating method, a sandwich laminating method, or the like.

[0021]

EXAMPLES Examples of the present invention are shown below, but the scope of the invention is not limited to these. Example 1 30 parts by weight of a polyetheresteramide (A-1) (manufactured by Sanyo Kasei Co., Ltd.) having a number average molecular weight of 13,000, low density polyethylene (B-1) (melt flow rate 4 g /
5 parts by weight of maleic anhydride-modified polyethylene wax (D) (trade name: Yumex 2000, manufactured by Sanyo Kasei Co., Ltd.) was mixed with 100 parts by weight of a total of 70 parts by weight for 10 minutes and a density of 0.931 g / cm ³ ). , Set temperature 200 ℃ 2
Melt kneading with a shaft extruder, extruding into a strand shape, cutting into pellets with a cutter, and hydrophilic polymer composition (E-
1) was manufactured.

Further, an ethylene / vinyl acetate copolymer (B
-2) (melt flow rate 2 g / 10 minutes, density 0.9
38 g / cm ³ , vinyl acetate content 15%) 100 parts by weight, 10 parts by weight of a mixture (C-1) in which sorbitan monostearate and polyethylene oxide sorbitan monostearate are mixed in a ratio of 1: 1. The obtained mixture was mixed, melt-kneaded with a twin-screw extruder having a preset temperature of 200 ° C., extruded into a strand shape, and cut into pellets with a cutter to produce a surfactant-containing composition (F-1).

Next, three-layer blown film molding
The hydrophilic high content obtained above in the innermost layer antifogging film layer of the machine
Composition containing surfactant in 100 parts by weight of child composition (E-1)
The mixture containing 10 parts by weight of the product (F-1) was added to the intermediate layer.
Ethylene / vinyl acetate copolymer (B-3) (Melt flow
-Rate 0.5g / 10min, Density 0.938g / c
m ^Three, Vinyl acetate content 15%), ethylene in the outermost layer
Vinyl acetate copolymer (B-4) (melt flow rate
0.5 g / 10 minutes, density 0.927 g / cm^Three, Vinyl acetate
Nyl content 3.5%) 60 wt% and ethylene vinyl acetate
Copolymer (B-5) (melt flow rate 1.5 g / 1
0 minutes, density 0.93 g / cm^Three, Vinyl acetate content 7.5
%) 40% by weight of the mixture (B-6), temperature 18
At 0 ° C, the thickness ratio is anti-fog film layer / intermediate layer / outermost layer =
A 100 μm thick film was obtained at 1/4/1. This farm
The flowability of the hydrophilic polymer-containing surface of the industrial film at 50 ° C
Acceleration evaluation was performed by the following method using a thermostat.

Evaluation method: 150 cc of water was placed in a beaker having an internal capacity of 200 cc and an inclined structure on the upper end surface, and the film was placed around the upper end of the beaker so that the hydrophilic polymer-containing surface of the agricultural film became the inner surface. Then, the beaker was soaked in a constant temperature water bath at 50 ° C., and the drop continuity was evaluated while maintaining the outside air temperature at 25 ° C. Table 1 shows the results of the following three stages of the determination of the dropping property. ：: No water droplets adhered to the inner surface of the film. Δ: Water droplets adhered to 50% of the inner surface of the film. ×: Water droplets adhered to the entire inner surface of the film. It should be noted that ◯ to Δ are water droplets in the middle of ◯ and Δ, and Δ to × are water droplets in the middle of δ and ×. The evaluation of transparency is JIS K710
Based on 5, HAZE (%) was determined. The transparency is shown in Table 1 as the following two stages. ◯: Haze 10% or less x: Haze 10% or more

Example 2 5 parts by weight of maleic anhydride-modified polyethylene wax (D) was added to 100 parts by weight of 40 parts by weight of polyetheresteramide (A-1) and 60 parts by weight of low-density polyethylene (B-1). The mixture was mixed, melt-kneaded with a twin-screw extruder at a set temperature of 200 ° C., extruded into a strand shape, and cut into pellets with a cutter to produce a hydrophilic polymer composition (E-2). Hereinafter, in the antifogging film layer of a three-layer blown film molding machine, the hydrophilic polymer (E-
An agricultural film was obtained in the same manner as in Example 1 except that (2) was used instead of (E-1).

Example 3 5 parts by weight of maleic anhydride-modified polyethylene wax (D) was added to 100 parts by weight of 20 parts by weight of polyetheresteramide (A-1) and 80 parts by weight of low-density polyethylene (B-1). The mixture was mixed, melt-kneaded with a twin-screw extruder having a preset temperature of 200 ° C., extruded into a strand shape, and cut into pellets with a cutter to produce a hydrophilic polymer composition (E-3). Hereinafter, the hydrophilic polymer composition (E-
An agricultural film was obtained in the same manner as in Example 1 except that 3) was used instead of (E-1).

Example 4 5 parts by weight of sorbitan monostearate, glycerin monostearate, diglycerin monostearate and polyethylene oxide sorbitan monostearate were added to 100 parts by weight of ethylene / vinyl acetate copolymer (B-2).
Mixture (C-2) 10 formulated in a ratio of 2: 2: 1
Mix 2 parts by weight and mix at a set temperature of 200 ℃
Melt kneading with a shaft extruder, extruding into strands, cutting into pellets with a cutter, and the composition containing surfactant (F
-2). Hereinafter, Example 1 except that the surfactant composition (F-2) obtained above was used instead of (F-1) in the antifogging layer of a three-layer blown film molding machine.
An agricultural film was obtained in the same manner as.

Example 5 70 parts by weight of polyetheresteramide (A-1),
Ethylene / vinyl acetate copolymer (B-7) (melt flow rate 3 g / 10 min, density 0.928 g / cm ³ , vinyl acetate content 5%) 30 parts by weight in total of 100 parts by weight, maleic anhydride modified polyethylene 5 parts by weight of wax (D) is mixed, melt-kneaded with a twin-screw extruder at a set temperature of 200 ° C., extruded in a strand shape, and cut into pellets with a cutter to obtain a hydrophilic polymer composition (E-4). Manufactured.
Hereinafter, an agricultural film was prepared in the same manner as in Example 1 except that the hydrophilic polymer (E-4) obtained above was used instead of (E-1) in the antifogging layer of a three-layer blown film molding machine. Got

Example 6 In an antifogging layer of a three-layer blown film molding machine, 100 parts by weight of a hydrophilic polymer composition (E-4) and 20 parts by weight of a surfactant-containing composition (F-1) were mixed. An agricultural film was obtained in the same manner as in Example 1 except that the above film was used. Example 7 The antifogging layer of a three-layer blown film molding machine was prepared by blending 100 parts by weight of the hydrophilic polymer composition (E-4) with 5 parts by weight of the surfactant-containing composition (F-1). An agricultural film was obtained in the same manner as in Example 1 except that the above was used. Example 8 For the antifogging layer of a three-layer blown film molding machine, 100 parts by weight of the hydrophilic polymer composition (E-4) and 10 parts by weight of the surfactant-containing composition (F-2) were used. An agricultural film was obtained in the same manner as in Example 1 except that the above was used.

Example 9 A mixture of an ethylene / vinyl acetate copolymer (B-3) and an ethylene / vinyl acetate copolymer (B-6) was added in an amount of 10 each.
Mixture of surfactants (C-2) to 0 parts by weight of resin
10 parts by weight are mixed, melt-kneaded by a twin-screw extruder having a set temperature of 200 ° C., extruded in a strand shape, cut into pellets by a cutter, and a surfactant-containing composition (F-3),
(F-4) was produced, respectively. For the antifogging layer of the three-layer blown film molding machine, the hydrophilic polymer composition (E-
4) 100 parts by weight of the surfactant-containing composition (F-2) in 5 parts by weight, and the intermediate layer in the surfactant-containing composition (F-3).
Was obtained in the same manner as in Example 1 except that the surfactant-containing composition (F-4) was used as the outermost layer.

Comparative Example 1 5 parts by weight of maleic anhydride-modified polyethylene wax (D) based on 100 parts by weight of 3 parts by weight of polyetheresteramide (A-1) and 97 parts by weight of low-density polyethylene (B-1). Were mixed, melt-kneaded with a twin-screw extruder having a preset temperature of 200 ° C., extruded into a strand shape, and cut into pellets with a cutter to produce a hydrophilic polymer composition (E-5). Hereinafter, the hydrophilic polymer composition (E-
An agricultural film was obtained in the same manner as in Example 1 except that 5) was used.

Comparative Example 2 95 parts by weight of polyetheretheramide (A-1),
5 parts by weight of maleic anhydride-modified polyethylene wax (D) was mixed with 100 parts by weight of low-density polyethylene (B-1) in total, and melt-kneaded in a twin-screw extruder at a set temperature of 200 ° C. to form a strand. And then cut into pellets with a cutter to produce a hydrophilic polymer composition (E-6). The hydrophilic polymer composition (E-6) obtained above was used for the antifogging layer of a three-layer blown film molding machine, and film formation was attempted, but delamination occurred and film formation was impossible.

Comparative Example 3 An agricultural film was obtained in the same manner as in Example 1 except that only low density polyethylene (B-1) was used in the innermost layer. Comparative Example 4 An attempt was made to form a film using only the polyether ester amide (A-1) in the innermost layer, but delamination occurred and the film could not be formed.

Comparative Example 5 30 parts by weight of polyetheresteramide (A-1),
Low density polyethylene (B-1) 70 parts by weight in total 100
5 parts by weight of maleic anhydride-modified polyethylene wax (D) and 10 parts by weight of a mixture of surfactants (C-1) 10 parts by weight.
The parts by weight were mixed, melt-kneaded with a twin-screw extruder at a preset temperature of 200 ° C., extruded in a strand shape, and cut into pellets with a cutter to produce a hydrophilic polymer composition (E-7). Hereinafter, an agricultural film was obtained in the same manner as in Example 1 except that the hydrophilic polymer composition (E-7) obtained above was used for the antifogging layer of the three-layer blown film molding machine.

Comparative Example 6 In an anti-fogging layer of a three-layer blown film molding machine, 0.2 part by weight of the surfactant-containing composition (F-1) was added to 100 parts by weight of the hydrophilic polymer composition (E-4). An agricultural film was obtained in the same manner as in Example 1 except that the ingredients were blended. Comparative Example 7 Surfactant composition (F-4) was used for the antifogging layer of a three-layer blown film molding machine, surfactant-containing composition (F-3) was used for the intermediate layer, and surfactant-containing composition was used for the outermost layer. Thing (F-
4) An agricultural film was obtained in the same manner as in Example 1 except that it was used.

Comparative Example 8 Ethylene / vinyl acetate copolymer (B-2) (melt flow rate 2 g / 10 minutes, density 0.938 g / cm ³ , vinyl acetate content 15%) 100 parts by weight of cation system Was mixed with 10 parts by weight of octadecyltrimethylammonium chloride (C-3), which is a surfactant, and melt-kneaded with a twin-screw extruder at a set temperature of 200 ° C., extruded into strands, and pelletized with a cutter. It cut | disconnected and manufactured the surfactant containing composition (F-3). Next, 100 parts by weight of the hydrophilic polymer composition (E-1) was mixed with 10 parts by weight of the surfactant-containing composition (F-3) obtained above in the antifogging layer of the three-layer blown film molding machine. An agricultural film was obtained in the same manner as in Example 1 except for the above. Results of accelerated test of drip property of these agricultural films and 3
Table 1 shows the transparency after forming the layer inflation film.

Example 10 30 parts by weight of a polyetheresteramide (A-2) having a number average molecular weight of 25,000 and low density polyethylene (B-
1) (melt flow rate 4 g / 10 minutes, density 0.93
1 g / cm ³ ) 70 parts by weight in total, and 5 parts by weight of maleic anhydride-modified polyethylene wax (D) are mixed, melt-kneaded with a twin-screw extruder at a set temperature of 200 ° C., and extruded in a strand form, A hydrophilic polymer composition (E-8) was produced by cutting it into pellets with a cutter. 3
Example 1 except that 100 parts by weight of the hydrophilic polymer composition (E-8) and 10 parts by weight of the surfactant-containing composition (F-1) were blended in the antifogging layer of the layer blown film molding machine.
An agricultural film was obtained in the same manner as.

Example 11 30 parts by weight of polyether amide imide (A-3) having a number average molecular weight of 20,000, low density polyethylene (B-1)
(Melt flow rate 4g / 10 minutes, density 0.931g
/ Cm ³ ) 70 parts by weight in total, and 5 parts by weight of maleic anhydride-modified polyethylene wax (D) are mixed, melt-kneaded by a twin-screw extruder at a set temperature of 200 ° C., extruded in a strand shape, and cutter. A hydrophilic polymer composition (E-9) was produced by cutting into pellets with. Example 1 except that 100 parts by weight of the hydrophilic polymer composition (E-9) and 10 parts by weight of the surfactant-containing composition (F-1) were mixed in the antifogging layer of the three-layer blown film molding machine. Similarly, an agricultural film was obtained.

[0039]

[Table 1]

[0040]

EFFECTS OF THE INVENTION A hydrophilic polymer composition and an agricultural film having excellent initial drip properties and long-term sustainability.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C08J 5/18 CEZ C08J 5/18 CEZ C08L 23/00 LCU C08L 23/00 LCU 77/12 LQS 77 / 12 LQS 79/08 LRC 79/08 LRC (72) Inventor Kiyomaro Sudo 1 Toho-cho, Yokkaichi-shi, Mie Mitsubishi Chemical Co., Ltd. Yokkaichi Research Institute

Claims (6)

[Claims] 1. A hydrophilic polymer having (A) a polyether group and a number average molecular weight of 1,000 to 500,000, 5 to 90% by weight, and (B) an olefin resin, 95 to 10% by weight,
An antifogging resin composition, which is obtained by kneading 0.05 to 5 parts by weight of a nonionic surfactant (C) with 100 parts by weight of the total amount of both. 2. The hydrophilic polymer (A) is a polyether ester amide or a polyether amide imide, and the olefin resin (B) has a density of 0.880-0.
A resin selected from 942 g / cm ³ of low-density polyethylene and ethylene / vinyl acetate copolymer, in which the nonionic surfactant (C) is selected from glycerin ester type, sorbitan ester type, sorbitan ester ether type, and amide type. The antifogging resin composition according to claim 1, which is a selected surfactant. 3. A hydrophilic polymer (A) having a polyether ester amide content of 5 to 90% by weight, and an olefin resin (B) having a density of 0.900 to 0.942 g / cm ^3.
95 to 10% by weight of the high-pressure low-density polyethylene or ethylene / vinyl acetate copolymer of (C) nonionic surfactant 0.05 to
5 parts by weight, and (D) an acid anhydride or a polyolefin modified with an epoxy group-containing vinyl monomer 0.1 to 1
The antifogging resin composition according to claim 1, which is obtained by kneading with 0 part by weight. 4. The antifogging resin composition according to claim 3, wherein the component (D) is a maleic acid-modified polyethylene wax. 5. An antifogging agricultural film comprising the antifogging resin composition according to any one of claims 1 to 4. 6. A laminated structure having a laminated structure in which an antifogging film layer having a thickness of 5 to 30 μm, which comprises the antifogging resin composition according to claim 1, and an ethylene resin film layer are laminated. Agricultural film with a thickness of 30 to 200 μm.