JP2007031545A - Anti-fogging resin sheet and anti-fogging molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-fogging resin sheet which can retain the anti-fogging property for a long time even under high temperature without giving a sticky touch to the surface of the resin sheet, and to provide an anti-fogging molded article. <P>SOLUTION: This anti-fogging sheet is characterized by coating a styrenic resin, an ethylene terephthalate-based resin, an aliphatic ester-based resin or the like with an anti-fogging agent containing a partial ester compound of sucrose with a 12 to 22C aliphatic monocarboxylic acid and an alkali metal 14 to 22C aliphatic monocarboxylate, or the anti-fogging agent further containing a betaine group-having aliphatic acrylic resin. And the anti-fogging molded article. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an antifogging resin sheet and an antifogging molded article. Resin sheets and molded products obtained by molding resin sheets are widely used for food packaging materials, food packaging containers, and the like. Such food packaging materials and food packaging containers are required to have antifogging properties because it is important that the contents can be visually recognized. In particular, when the content is a warm food, it is required to maintain antifogging properties for a long time even at high temperatures. The present invention relates to an anti-fogging resin sheet and an anti-fogging molded body that meet such requirements.

  Conventionally, as an antifogging resin sheet, 1) an antifogging resin sheet coated with a sucrose fatty acid ester after corona discharge treatment (see, for example, Patent Document 1), 2) a sucrose fatty acid ester, a polyglycerin fatty acid ester, and a polyoxypropylene Antifogging resin sheet whose surface is coated with a mixture with a polyoxyethylene block polymer (see, for example, Patent Document 2), 3) Antifogging resin sheet having an antifogging film comprising sucrose fatty acid ester and polyvinyl alcohol ( For example, see Patent Document 3), 4) an antifogging resin sheet coated with an antifogging agent containing a sucrose fatty acid ester and an acrylic polymer (see, for example, Patent Document 4), 5) an anionic surfactant, An antifogging resin sheet having a surfactant layer composed of an ionic surfactant (for example, see Patent Document 5) has been proposed. .

However, these conventionally proposed antifogging resin sheets have a problem that the antifogging property cannot be maintained for a long time even at high temperatures without causing a sticky feeling on the surface of the resin sheet.
JP-A-5-98054 JP 2003-201355 A JP 2000-280410 A Japanese Patent Laid-Open No. 2003-253241 JP 2002-12687 A

  The problem to be solved by the present invention is to provide an anti-fogging resin sheet and an anti-fogging molded article that can maintain anti-fogging properties for a long time even at high temperatures without causing a sticky feeling on the surface of the resin sheet. .

  The present invention for solving the above problems is an antifogging resin sheet obtained by applying an antifogging agent to a resin sheet, wherein the antifogging agent is a partial ester compound of sucrose and an aliphatic monocarboxylic acid having 12 to 22 carbon atoms. And an antifogging resin sheet characterized by containing an alkali metal salt of an aliphatic monocarboxylic acid having 14 to 22 carbon atoms. The present invention also relates to an antifogging molded article formed by molding the above antifogging resin sheet.

  The antifogging agent used for the antifogging resin sheet of the present invention comprises a partial ester compound of sucrose and an aliphatic monocarboxylic acid having 12 to 22 carbon atoms, and an alkali metal salt of an aliphatic monocarboxylic acid having 14 to 22 carbon atoms. It contains.

  The partial ester compound used for the antifogging agent is 1) a monoester compound in which one molecule of aliphatic monocarboxylic acid having 12 to 22 carbon atoms is ester-bonded to one molecule of sucrose, and 2) one molecule of sucrose having 12 to 22 carbon atoms. Examples thereof include di-heptaester compounds in which 2 to 7 molecules of aliphatic monocarboxylic acid are ester-bonded. Examples of the aliphatic monocarboxylic acid having 12 to 22 carbon atoms used as a raw material for such a partial ester compound include dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, eicosanoic acid, tetradecenoic acid, octadecenoic acid, eicosenoic acid, isooctadecanoic acid, Examples thereof include 12-hydroxyoctadecanoic acid, among which aliphatic monocarboxylic acids having 14 to 18 carbon atoms are preferable.

  Specific examples of the partial ester compound described above include sucrose octadecanate [mixture of monoester compound / di to heptaester compound = 70/30 (mass%), hereinafter referred to as M / P = 70/30], sucrose hexa Decanato (M / P = 80/20), sucrose tetradecanate (M / P = 70/30), sucrose docosinate (M / P = 70/30), sucrose dodecanate (M / P = 70/30), etc. Is mentioned.

  Examples of the alkali metal salt of an aliphatic monocarboxylic acid having 14 to 22 carbon atoms used as an antifogging agent are 1) lithium tetradecanoate, lithium hexadecanoate, lithium octadecanoate, lithium eicosanoate, lithium tetradecenoate, lithium octadecenoate, eicosenoic acid Lithium, lithium isooctadecanoate, lithium 12-hydroxyoctadecanoate and other aliphatic monocarboxylic acid having 14 to 22 carbon atoms, 2) sodium tetradecanoate, sodium hexadecanoate, sodium octadecanoate, sodium eicosanoate, sodium tetradecenoate, C14-22 aliphatic sodium monocarboxylate such as sodium octadecenoate, sodium eicosenoate, sodium isooctadecanoate, sodium 12-hydroxyoctadecanoate 3) Fats having 14 to 22 carbon atoms such as potassium tetradecanoate, potassium hexadecanoate, potassium octadecanoate, potassium eicosanoate, potassium tetradecenoate, potassium octadecenoate, potassium eicosenoate, potassium isooctadecanoate, potassium 12-hydroxyoctadecanoate An aliphatic monocarboxylic acid alkali metal salt having 16 to 20 carbon atoms is preferable, and sodium aliphatic monocarboxylate having 16 to 20 carbon atoms is more preferable.

  As described above, the antifogging agent used in the antifogging resin sheet of the present invention is a partial ester compound of sucrose and an aliphatic monocarboxylic acid having 12 to 22 carbon atoms and an aliphatic monoester having 14 to 22 carbon atoms. Although it contains a carboxylic acid alkali metal salt, as such an antifogging agent, partial ester compound / aliphatic monocarboxylic acid alkali metal salt = 30/70 to 90/10 (mass ratio). What is contained is preferable, and what is contained at a ratio of 50/50 to 80/20 (mass ratio) is more preferable. In the antifogging agent used in the antifogging resin sheet of the present invention, the total content of the partial ester compound and the aliphatic monocarboxylic acid alkali metal salt is not particularly limited, but the partial ester compound and the aliphatic monocarboxylic acid alkali metal What contains 60 mass% or more of salt in total is preferable, and what contains 90 mass% or more in total is more preferable.

As the antifogging agent used in the antifogging resin sheet of the present invention, those obtained by further adding a hydrophilic acrylic resin in addition to the partial ester compound and the aliphatic monocarboxylic acid alkali metal salt described above are preferable. Such a hydrophilic acrylic resin is formed from a structural unit formed from a vinyl monomer represented by the following chemical formula 1 and another vinyl monomer copolymerizable with the vinyl monomer represented by chemical formula 1. And a vinyl copolymer having a structural unit.

In chemical formula 1,
R ¹ : a hydrogen atom or a methyl group R ² : an alkylene group having 1 to 4 carbon atoms R ³ and R ⁴ : an alkyl group having 1 to ⁴ carbon atoms

In the vinyl monomer represented by Chemical Formula 1, R ^{1 in} Chemical Formula ¹ is a hydrogen atom or a methyl group. R ² is an alkylene group having 1 to 4 carbon atoms such as a methylene group, an ethylene group, a trimethylene group, or a tetramethylene group. R ³ and R ⁴ are alkyl groups having 1 to 4 carbon atoms such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and an isobutyl group. Such vinyl monomers are preferably those in which R ^{1 in} Chemical Formula ¹ is a hydrogen atom or a methyl group, R ² is an ethylene group, and R ³ and R ⁴ are a methyl group or an ethyl group.

  Examples of other vinyl monomers copolymerizable with the vinyl monomer represented by Chemical Formula 1 are 1) hydroxymethyl acrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, hydroxymethyl methacrylate , 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, etc., hydroxyalkyl (meth) acrylates having a hydroxyalkyl group having 1 to 4 carbon atoms, 2) 2,2-dihydroxyethyl acrylate, 2 , 3-dihydroxypropyl acrylate, 4,4-dihydroxybutyl acrylate, 2,2-dihydroxyethyl methacrylate, 2,3-dihydroxypropyl methacrylate, 4,4-dihydroxybutyl methacrylate Dihydroxyalkyl (meth) acrylates having 1 to 4 carbon dihydroxyalkyl groups such as dimethacrylate, 3) methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate, decyl acrylate, dodecyl acrylate, hexa Decyl acrylate, octadecyl acrylate, isooctadecyl acrylate, cyclopentyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, hexyl methacrylate, octyl methacrylate, decyl methacrylate, dodecyl methacrylate, hexadecyl methacrylate, octadecyl methacrylate, isoo 1 piece of alkyl (meth) acrylate having an alkyl group having 1 to 18 carbon atoms, such as tadecyl methacrylate, cyclopentyl methacrylate, cyclohexyl methacrylate, 4) N-methylacrylamide, N-ethylacrylamide, N-isopropylacrylamide, etc. Mono-substituted (meth) acrylamide substituted with an alkyl group having 1 to 3 carbon atoms, 5) 2 carbon atoms of 1 such as N, N-dimethylacrylamide, N, N-diethylacrylamide, N, N-diisopropylacrylamide Disubstituted (meth) acrylamide substituted with ~ 3 alkyl groups, 6) aromatic vinyl monomers such as styrene, p-methylstyrene, α-methylstyrene, vinyltoluene, etc. Hydroxy having 1-4 hydroxyalkyl groups One or two or more selected from alkyl (meth) acrylate and alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms is preferable, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, ethyl acrylate, methyl methacrylate Is more preferable.

  The hydrophilic acrylic resin that constitutes the antifogging agent used in the antifogging resin sheet of the present invention comprises a structural unit formed from a vinyl monomer represented by chemical formula 1 as described above, and chemical formula 1 And a structural unit formed from a vinyl monomer copolymerizable with the vinyl monomer represented by formula (1). 60% by mass, having 40 to 90% by mass (total 100% by mass) of structural units formed from other vinyl monomers copolymerizable with the vinyl monomer represented by Chemical Formula 1, and having a number average molecular weight 10,000 to 100,000. Among these, as the hydrophilic acrylic resin, a hydroxyalkyl (meth) acrylate having 10 to 60% by mass of a structural unit formed from a vinyl monomer represented by Chemical Formula 1 and having a hydroxyalkyl group having 1 to 4 carbon atoms. 10 to 70% by mass (total 100% by mass) of structural units formed from an alkyl (meth) acrylate having an alkyl group having 10 to 40% by mass and an alkyl group having 1 to 4 carbon atoms, and Those having a number average molecular weight of 20000 to 90000 are preferred.

  The hydrophilic acrylic resin itself used in the present invention described above can be synthesized by a known method, for example, a method described in JP-A-2004-244605. More specifically, a radical polymerization initiator is prepared by dissolving a vinyl monomer represented by Chemical Formula 1 and another vinyl monomer copolymerizable with the monomer represented by Chemical Formula 1 in a solvent such as methanol. Then, a radical chain transfer agent can be added as appropriate, followed by a radical copolymerization reaction at a radical polymerization temperature in a nitrogen atmosphere.

  When the antifogging agent used in the antifogging resin of the present invention contains a partial ester compound, an aliphatic monocarboxylic acid alkali metal salt and an acrylic hydrophilic resin as described above, such an antifogging agent. Is contained in a ratio of (partial ester compound + alkali metal salt of aliphatic monocarboxylic acid) / hydrophilic acrylic resin = 70/30 to 20/80 (mass ratio), but 60/40 to 30/70. What is contained in the ratio of (mass ratio) is preferable. Further, in the antifogging agent used in the antifogging resin sheet of the present invention, the total content of the partial ester compound, the aliphatic monocarboxylic acid alkali metal salt and the hydrophilic acrylic resin is not particularly limited, but the partial ester compound and the aliphatic What contains 95 mass% or more of monocarboxylic-acid alkali metal salt and hydrophilic acrylic resin in total is preferable.

  In the antifogging resin sheet of the present invention, a known resin sheet to be coated with the antifogging agent as described above can be used. For example, 1) a styrene resin sheet produced from polystyrene, a styrene / acrylonitrile copolymer, 2) an ethylene terephthalate resin sheet produced from an ethylene glycol / terephthalic acid copolymer, etc., 3) polylactic acid Aliphatic ester resin sheet manufactured from 4) Polyvinyl chloride, vinyl chloride resin sheet manufactured from ethylene / vinyl chloride copolymer, etc. 5) Polymethyl methacrylate, methyl methacrylate / styrene copolymer, etc. Acrylic resin sheet manufactured from 6) Nylon resin sheet manufactured from 6-nylon, 6,6-nylon, etc. 7) Carbonate resin sheet, 8) Olefin resin manufactured from polyethylene, polypropylene, etc. Sheet, etc., among them styrene resin sheet , Ethylene terephthalate-based resin sheet, aliphatic ester-based resin sheet is preferable. Examples of the resin sheet described above include those produced by known sheet forming means such as an amorphous sheet, an unstretched sheet, a simultaneous biaxially stretched sheet, and a sequential biaxially stretched sheet. These resin sheets may be subjected to surface treatment such as corona treatment as necessary.

In the antifogging resin sheet of the present invention, a known method can be used as a method of applying the antifogging agent as described above to the resin sheet. This includes, for example, spray coating methods, gravure coating methods, air knife coating methods, bar coating methods, kiss coating methods, flow coating methods, dip coating methods using coating solutions prepared by dissolving an antifogging agent in a solvent. Can be mentioned. Examples of the solvent for dissolving the antifogging agent include water, alcohol, toluene, ethyl acetate and the like alone or in combination. Among them, water or a mixed solution of water and an alcohol having 1 to 3 carbon atoms is preferable. . The coating amount of the antifogging agent is preferably 5 to 50 mg / m ² per one side of the resin sheet.

  In addition to the anti-fogging agent, a release agent such as silicone oil or polyoxyalkylene polymer can be applied to the anti-fogging resin sheet of the present invention as required. Such a release agent may be applied to either the antifogging agent-coated surface or the opposite surface. When such a release agent is applied to the antifogging agent coating surface, a premixed antifogging agent may be applied or may be applied separately.

  The resin sheet of the present invention can be thermoformed according to the use to form a molded body such as a container. Examples of such thermoforming methods include vacuum forming and pressure forming. Moreover, as a molded object, the lid | cover, tray, etc. of a drink and a food container are mentioned.

  According to the present invention described above, there is an effect that it is possible to provide an antifogging resin sheet and an antifogging molded article that can maintain antifogging properties for a long time even at high temperatures without causing a sticky feeling on the surface of the resin sheet.

  Hereinafter, in order to make the configuration and effects of the present invention more specific, examples and the like will be described. However, the present invention is not limited to these examples. In the following Examples and Comparative Examples, “part” means “part by mass” and “%” means “% by mass”.

Test category 1 (Preparation of anti-fogging resin sheet)
Example 1
A solvent 99.90 of sucrose octadecanate (M / P = 70/30) (A-1) and 0.12 g of sodium octadecanoate (B-1) in water / isopropyl alcohol = 90/10 (mass ratio). A coating solution having an effective concentration of 0.4% was prepared by dissolving in 6 g. An ethylene terephthalate-based resin sheet (non-crystalline type, surface-treated with a corona treatment to a wet tension of 40 mN / m), the prepared coating solution was 10 g / m ² per side with a bar coater (40 mg / m in terms of anti-fogging agent) ² ) After coating, it was dried at 70 ° C. to prepare an antifogging resin sheet.

Examples 2 to 23 and Comparative Examples 1 to 8
In the same manner as in Example 1, antifogging resin sheets of Examples 2 to 23 and Comparative Examples 1 to 8 were produced. These contents including Example 1 are summarized in Table 1.

Test category 2 (evaluation of anti-fogging resin sheet)
The antifogging resin sheet produced in Test Category 1 was evaluated for antifogging properties at high temperatures, durability of antifogging properties, and stickiness by the following methods. The results are summarized in Table 2.

・ Anti-fogging property at high temperature The anti-fogging resin sheet prepared in Test Category 1 is cut into a 7cm diameter circle, and the anti-fogging agent is applied to the inside of the beaker in a 200ml beaker containing 100ml of hot water at 60 ℃. The beaker was immersed in the constant temperature water bath at 60 ° C. for 10 minutes and then left on the inner surface of the antifogging resin sheet beaker without removing the beaker from the constant temperature water bath. The degree of water droplet adhesion was observed and evaluated according to the following criteria.
Evaluation criteria ◎: Transparent with no water droplets, excellent antifogging properties ○: Large water droplets, but transparent, good antifogging properties △: Water droplets are slightly opaque, and antifogging properties are inferior ×: There are small water droplets, it is opaque, the antifogging property is extremely inferior, and it is not practical

・ Durability of anti-fogging After evaluating the anti-fogging property at the above-mentioned high temperature, it is left as it is, and water drops are attached to the inner surface of the beaker of the anti-fogging resin sheet so that it becomes slightly opaque and is anti-fogging. Was measured until the time until it became inferior (Δ state in the evaluation of antifogging properties at high temperatures), and the measured value was evaluated according to the following criteria.
Evaluation Criteria A: Antifogging duration is 4 hours or longer and antifogging duration is excellent. O: Antifogging duration is 2 hours or longer and less than 4 hours, and antifogging duration is maintained. Δ: The antifogging duration is 1 hour or more and less than 2 hours, and the antifogging duration is inferior. ×: The antifogging duration is less than 1 hour, and the antifogging property is good. Is extremely inferior in durability and impractical

-Stickiness A touch of the antifogging agent-coated surface of the antifogging resin sheet immediately after preparation was touched with a fingertip to sensoryly evaluate the stickiness, and evaluated according to the following criteria.
◎: Good with no stickiness ○: Less sticky and practical ×: Strong stickiness and impractical

In Table 1,
A-1: Sucrose octadecanate (M / P = 70/30)
A-2: Sucrose hexadecanate (M / P = 80/20)
A-3: Sucrose tetradecanate (M / P = 70/30)
A-4: Mixture of sucrose octadecanate (M / P = 70/30) / sucrose hexadecanate (M / P = 80/20) = 30/70 (mass ratio) A-5: sucrose hexadecanate ( Mixture of M / P = 80/20) / sucrose tetradecanate (M / P = 80/20) = 60/40 (mass ratio) A-6: Sucrose docosanato (M / P = 70/30)
A-7: Sucrose dodecanate (M / P = 70/30)
A-8: Mixture of sucrose hexadecanate (M / P = 80/20) / sucrose docosinate (M / P = 70/30) = 50/50 (mass ratio) A-9: sucrose hexadecanate (M / P) Mixture of P = 80/20) / sucrose dotecanate (M / P = 70/30) = 70/30 (mass ratio) a-1: decaglycerin monooctadecanate a-2: diglycerin monooctadecanate a- 3: Sorbitan monooctadecanate a-4: Ethylene oxide 20 mol adduct of sorbitan monododecanate a-5: Ethylene oxide 10 mol adduct of dodecyl alcohol B-1: Sodium octadecanoate B-2: Sodium octadecenoate B -3: sodium hexadecenoate B-4: sodium octadecanoate / sodium octadecenoate = 20/80 (mass B-5: Sodium octadecenoate / Sodium hexadecenoate = 80/20 (mass ratio) B-6: Potassium octadecenoate B-7: Potassium octadecanoate B-8: Sodium tetradecanoate B-9: Potassium docosenoate B-10: Mixture of sodium octadecenoate / sodium tetradecanoate = 50/50 (mass ratio) B-11: Mixture of sodium octadecenoate / potassium docosenoate = 50/50 (mass ratio) b-1: Dodecane Potassium acid S-1: Ethylene terephthalate resin sheet (non-crystalline type, surface treated to a wet tension of 40 mN / m by corona treatment)
S-2: Ethylene terephthalate resin sheet (biaxially stretched type)
S-3: Aliphatic ester-based resin sheet (non-stretched, surface-treated with a corona treatment to a wet tension of 40 mN / m)
S-4: Styrenic resin sheet (non-stretched type, surface-treated to a wet tension of 40 mN / m by corona treatment)
S-5: Styrenic resin sheet (biaxially stretched type, surface treated to a wet tension of 40 mN / m by corona treatment)
S-6: Polypropylene sheet (non-stretched type, surface treated to a wet tension of 40 mN / m by corona treatment)
S-7: Polymethyl methacrylate sheet (non-stretched type)
These are the same below

Test category 3 (Preparation of anti-fogging resin sheet)
Example 24
0.16 g of sucrose octadecanate (A-1), 0.064 g of sodium octadecanoate (B-1) and 0.18 g of hydrophilic acrylic resin (M-1) are dissolved in 99.596 g of water to obtain an effective concentration of 0 A 4% coating solution was prepared. An ethylene terephthalate-based resin sheet (non-crystalline type, surface-treated with a corona treatment to a wet tension of 40 mN / m) and the prepared coating solution with a bar coater were 10 g / m ² (40 mg / m ^{2 in} terms of anti-fogging agent). ) And then dried at 70 ° C. to prepare an antifogging resin sheet.

-Examples 25-46 and Comparative Examples 9-16
In the same manner as in Example 24, antifogging resin sheets of Examples 25 to 46 and Comparative Examples 9 to 16 were produced. These contents including Example 24 are summarized in Table 3.

Test category 4 (evaluation of anti-fogging resin sheet)
The antifogging resin sheet produced in Test Category 3 was evaluated for the antifogging property at high temperature, the durability of the antifogging property and the stickiness by the same method as in Test Category 2. The results are summarized in Table 5.

In Table 3,
(C-1) to (C-8): hydrophilic acrylic resins collectively shown in Table 4

In Table 4,
M-1: a structural unit formed from a vinyl monomer represented by Chemical Formula ¹ when R ^{1 in} Chemical Formula ¹ is a methyl group, R ² is an ethylene group, R ³ is a methyl group, and R ⁴ is a methyl group M-2: A structural unit formed from a vinyl monomer represented by Chemical Formula ¹ when R ^{1 in} Chemical Formula ¹ is a methyl group, R ² is an ethylene group, R ³ is an ethyl group, and R ⁴ is an ethyl group M-3: a structural unit formed from the vinyl monomer represented by Chemical Formula ¹ when R ^{1 in} Chemical Formula ¹ is a hydrogen atom, R ² is an ethylene group, R ³ is an ethyl group, and R ⁴ is an ethyl group N-1: structural unit formed from 2-hydroxyethyl methacrylate N-2: structural unit formed from 2-hydroxyethyl acrylate T-1: structural unit formed from methyl methacrylate T-2: formed from ethyl acrylate Unit T-3: Structural Units Formed from Tyl Acrylate U-1: Structural Units Formed from N, N-Dimethylmethacrylamide V-1: Structural Units Formed from Styrene

Test category 5
Example 47 (Preparation of antifogging molded article)
The antifogging resin sheet (P-1) produced in Test Category 1 is subjected to a pressure forming machine, and a truncated cone having an opening of 70 mm, a bottom of 60 mm, and a depth of 30 mm so that the surface coated with the antifogging agent is on the inside A shaped molded body was produced.

Examples 48 to 92 and Comparative Examples 17 to 32
In the same manner as in Example 47, molded articles of Examples 48 to 92 and Comparative Examples 17 to 32 were produced using the antifogging resin sheet produced in Test Category 1 or 3.

Test category 6 (evaluation of anti-fogging molded product)
The antifogging molded product produced in Test Category 5 was evaluated for the antifogging property at high temperatures, the durability of the antifogging property, and the feeling of stickiness in the same manner as in Test Category 2. The results are summarized in Table 6 and Table 7.

Claims (11)

  An antifogging resin sheet obtained by applying an antifogging agent to a resin sheet, wherein the antifogging agent is a partial ester compound of sucrose and an aliphatic monocarboxylic acid having 12 to 22 carbon atoms, and an aliphatic having 14 to 22 carbon atoms. An antifogging resin sheet comprising an alkali metal monocarboxylic acid salt.   The antifogging resin sheet according to claim 1, wherein the partial ester compound is a partial ester compound of sucrose and an aliphatic monocarboxylic acid having 14 to 18 carbon atoms.   The antifogging resin sheet according to claim 1 or 2, wherein the aliphatic monocarboxylic acid alkali metal salt is an aliphatic monocarboxylic acid alkali metal salt having 16 to 20 carbon atoms.   The antifogging resin sheet according to claim 1 or 2, wherein the aliphatic monocarboxylic acid alkali metal salt is sodium aliphatic monocarboxylate having 16 to 20 carbon atoms. The antifogging agent contains partial ester compound / aliphatic monocarboxylic acid alkali metal salt = 30/70 to 90/10 (mass ratio), and the antifogging agent is 5 per side of the resin sheet. to 50 mg / m ² and comprising as anti-fogging resin sheet of any one of the preceding of claims 1 to 4 is obtained by coating.   The antifogging resin sheet according to any one of claims 1 to 5, wherein the antifogging agent contains a partial ester compound and an alkali metal salt of an aliphatic monocarboxylic acid in total of 60% by mass or more. The antifogging agent further contains the following hydrophilic acrylic resin, and (partial ester compound + aliphatic monocarboxylic acid alkali metal salt) / acrylic hydrophilic resin = 70/30 to 20/80 (mass) The antifogging resin sheet according to any one of claims 1 to 5, wherein the antifogging resin sheet is contained at a ratio of (ratio).
Hydrophilic acrylic resin: 10 to 60% by mass of a structural unit formed from a vinyl monomer represented by the following chemical formula 1 in the molecule, other copolymerizable with the vinyl monomer represented by chemical formula 1 Vinyl copolymer having a number average molecular weight of 10,000 to 100,000, having 40 to 90% by mass (total 100% by mass) of structural units formed from vinyl monomers

(In chemical formula 1,
R ¹ : hydrogen atom or methyl group R ² : alkylene group having 1 to 4 carbon atoms R ³ and R ⁴ : alkyl group having 1 to ⁴ carbon atoms)   Other vinyl monomers copolymerizable with the vinyl monomer represented by Chemical Formula 1 have a hydroxyalkyl (meth) acrylate having a C1-C4 hydroxyalkyl group and a C1-C4 alkyl group The antifogging resin sheet according to claim 7, which is one or more selected from alkyl (meth) acrylates.   The antifogging resin sheet according to claim 7 or 8, wherein the antifogging agent contains 95% by mass or more of the partial ester compound, the aliphatic monocarboxylic acid alkali metal salt, and the hydrophilic acrylic resin in total.   The antifogging resin sheet according to any one of claims 1 to 9, wherein the resin sheet is a styrene resin sheet, an ethylene terephthalate resin sheet, or an aliphatic ester resin sheet. The anti-fogging molded object formed by shape | molding the anti-fogging resin sheet of any one of Claims 1-10.