JP2002194230A - Resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition excellent in anti-clouding property, coloring property, oxidation stability, heat stability, food safety, etc., and suitable for food wrapping purpose. SOLUTION: This resin composition contains 0.01-20 pts.mass polyglycerin fatty acid ester as component (A), 0.0001-5 pts.mass tocopherol as component (B), and 0.0001-5 pts.mass polyglycerin as component (C) to 100 pts.mass resin such as a polyolefin resin, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a resin composition,
More specifically, the present invention relates to a resin composition containing tocopherols and having excellent antifogging properties, coloring properties, oxidation stability, heat stability, food safety and the like.

[0002]

2. Description of the Related Art In recent years, problems have been raised with respect to polyvinyl chloride resins such as hydrogen chloride gas generated during incineration and elution of a large amount of a plasticizer. For this reason, the use of non-vinyl chloride resins such as polyolefin resins has been proposed especially in the field of food packaging materials. For example, polyethylene-based resins and polyolefin-based resins such as polypropylene-based resins are excellent in appearance, mechanical properties, packaging properties, processing properties, etc., and are particularly excellent in food hygiene. Have been. However, these non-vinyl chloride resins represented by polyolefin resins have a temperature suitable for the melting temperature of the resin (usually 150 to 300).
(High temperature of ° C), decomposition, oxidation, etc. occur due to shearing force and high-temperature heat during processing. In particular, an antifogging agent is added to a resin film for use in food packaging, and this antifogging agent component is easily oxidized and oxidized during high-temperature processing, causing a problem that the film is colored and its commercial properties are impaired.

Hitherto, as a technique for suppressing thermal and oxidative deterioration during processing of a polyolefin-based resin, a method of blending a phenol-based stabilizer or a phosphorus-based stabilizer alone or in combination has been used (for example, see Japanese Patent Application Laid-Open No. JP-A-51-109050, JP-A-52-106879, JP-A-57-2
No. 09942, JP-A-62-34934, JP-A-62-135550 and the like. However, when these phenolic stabilizers and phosphorus stabilizers are used as food packaging materials for food packaging, food containers, etc., their use may be restricted in terms of food hygiene and food safety. is there. On the other hand, it is a natural antioxidant,
A method of blending tocopherols which are harmless to the human body has been proposed (JP-A-63-105060, JP-A-6-105060).
JP-A-3-137941, JP-A-2-102241, JP-A-2-225542 and the like. However, these do not provide sufficient stability, especially when an antifogging agent is blended, the oxidation stability due to heat during processing is poor, and the commercial properties are impaired by coloring, or the oxidation of the antifogging agent causes Sufficient antifogging property was not obtained.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide excellent antifogging properties, coloring properties, oxidative stability, heat stability, food safety, etc. It is to provide a resin composition suitable for the above.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that by adding tocopherols and a specific antifogging component to resins such as polyolefin resins, oxidation stability and antifogging properties are improved. It has been found that a resin composition suitable for food packaging applications such as properties can be obtained, and the present invention has been completed.

That is, the present invention relates to a polyolefin resin, a copolymer of an olefin and a vinyl aromatic compound, a copolymer of a vinyl aromatic compound and a conjugated diene or a hydrogenated derivative thereof, a petroleum resin, a terpene resin, and a rosin resin. ,
And a resin selected from the group consisting of chroman-indene resin or a hydrogenated derivative thereof or a copolymer thereof, and 100 parts by mass of the resin or a copolymer thereof (hereinafter, simply referred to as “resin”). On the other hand, as the component (A), a polyglycerin fatty acid ester 0.1.
0.01 to 20 parts by mass; tocopherols as component (B) 0.0001 to 5
(C) 0.0001 to 5 parts by mass of polyglycerin having an average degree of polymerization of 2 or more.

[0007] The present invention further relates to a vitamin D as a component (D) in an amount of 0.0001 to 100 parts by mass of the resin.
It is a resin composition containing up to 5 parts by mass. The present invention also provides
Further, as a component (E), a sorbitan fatty acid ester is
The resin composition contains 0.01 to 10 parts by mass with respect to 100 parts by mass of the resin. The present invention is also a resin composition for a food packaging film comprising the above resin composition.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The base resin of the present invention is a polyolefin resin, a copolymer of an olefin and a vinyl aromatic compound, a copolymer of a vinyl aromatic compound and a conjugated diene or a hydrogenated derivative thereof. , A resin selected from the group consisting of petroleum resins, terpene resins, rosin resins, chroman-indene resins and hydrogenated derivatives thereof, or copolymers thereof.

As the polyolefin resin, for example,
Polyethylene resin, polypropylene resin, high density polyethylene, linear low density polyethylene which is a copolymer of ethylene and α-olefin, low density polyethylene produced by high pressure radical polymerization, homopolymer of propylene, butene Homopolymer, propylene-ethylene random copolymer, propylene-α-olefin random copolymer, propylene-ethylene-α-olefin terpolymer, copolymer composed mainly of propylene in at least two or more stages Coalescing component and propylene and ethylene and / or
Or a polypropylene-based copolymer (sometimes referred to as a propylene-ethylene block copolymer) produced by polymerizing a copolymer component of an α-olefin having 4 to 12 carbon atoms. Further, a copolymer of a polyolefin-based resin and another resin may be used. For example, an ethylene-vinyl acetate copolymer, an ethylene-alkyl acrylate copolymer, an ethylene-alkyl methacrylate copolymer, an ethylene-acrylic acid copolymer And an ethylene-methacrylic acid copolymer. Preferred as the polyolefin resin is a polyethylene resin,
More preferred are linear low density polyethylene resins. These polyolefin resins can be used alone or in combination of two or more.

The copolymerization ratio of the olefin and the vinyl aromatic compound is not particularly limited, but the copolymerization ratio of the olefin and the vinyl aromatic compound is preferably 30/70 to 70/30 by mass. Are preferred. The peak temperature of the loss elastic modulus (E ″) measured at a frequency of 10 Hz by dynamic viscoelasticity measurement of the copolymer is −20 to 20 ° C.
It is preferred that The heat of fusion of the copolymer is preferably 80 J / g or less. Specific examples include a copolymer of ethylene and styrene.

As a copolymer of a vinyl aromatic compound and a conjugated diene or a hydrogenated derivative thereof, the vinyl aromatic compounds include, for example, styrene, o-styrene and p-styrene.
-Styrene, α-methylstyrene, etc., as conjugated dienes, butadiene, isoprene, 1,3-pentadiene, etc., and as the conjugated diene block,
In addition to these homopolymers, isoprene blocks having a high 3,4-bond ratio, blocks obtained by random copolymerization of styrene or the like with conjugated dienes, tapered blocks obtained by copolymerizing styrene or the like with a constant concentration gradient in conjugated dienes, etc. Are also mentioned. Specific examples of the copolymer of a vinyl aromatic compound and a conjugated diene include a styrene-butadiene block copolymer and a styrene-isoprene block copolymer.

Further, as the resin used as the base material in the present invention, petroleum resins such as alicyclic petroleum resins derived from cyclopentadiene or a dimer thereof and aromatic petroleum resins derived from the C9 component; β-pinene Terpene resins such as terpene resins and terpene-phenol resins; rosin resins such as gum rosin, wood rosin, esterified rosin resin modified with glycerin and pentaerythritol;
Chroman-indene resin and the like, and hydrogenated derivatives thereof may be used.

The above resins used as the base material in the present invention may be used alone or as a mixture of two or more kinds. If copolymerizable, the resins may be copolymerized with each other in a block or random manner. May be done. Of the above resins, the most preferred are polyolefin resins,
Among them, polyethylene resin is preferred from the viewpoint of film strength such as tear strength of the film.

In the present invention, the resin as a base material contains a polyglycerin fatty acid ester as the component (A). The polyglycerin fatty acid ester is an ester compound of a fatty acid and polyglycerin having an average degree of polymerization of 2 or more, such as diglycerin, triglycerin, tetraglycerin, pentaglycerin, and hexaglycerin. Polyglycerin is usually a mixture of different degrees of polymerization. The fatty acid preferably has 2 to 24 carbon atoms, more preferably 6 to 22 carbon atoms, and particularly, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid,
Oleic acid, behenic acid and the like are preferred. This is because the polyglycerol fatty acid ester obtained from these fatty acids has good compatibility with the resin and has an appropriate concentration on the resin surface, so that blooming or bleeding does not damage the surface. The ester may be any of monoester, sesquiester, diester and the like, and may be a mixture thereof.

As these polyglycerin fatty acid esters, specifically, for example, diglycerin monostearate, diglycerin dipalmitate, diglycerin distearate, diglycerin monopalmitate / stearate (palmitic acid and stearic acid) Mixed fatty acid esters of acids), diglycerin monooleate, diglycerin sesquiolate, diglycerin monolaurate, diglycerin monodecanoate, triglycerin distearate,
Tetraglycerin monooleate, tetraglycerindiolate, hexaglycerindiolate, hexaglycerin dilaurate and the like, particularly diglycerin monooleate, diglycerin sesquiolate, diglycerin monolaurate, diglycerin monodecaneate, tetraglycerin monodecanol Olate, tetraglycerindiolate, hexaglycerindiolate and hexaglycerin dilaurate are preferred. As the polyglycerin fatty acid ester, diglycerin fatty acid ester is preferable, and oleic acid ester is most preferable.

The component (A) of the present invention may be used alone or in combination of two or more. The content of the component (A) of the present invention is 0.01 to 20 parts by mass, and preferably 0.1 to 10 parts by mass, based on 100 parts by mass of the resin. When the content is less than 0.01 part by mass, the effects expected from the component (A) such as improvement of the surface properties of the resin cannot be obtained. When the content exceeds 20 parts by mass, the component (A) is present on the resin surface. This is because bleeding or blooming may damage the product.

Next, the resin as the base material in the present invention includes:
(B) Tocopherols are contained as a component. As tocopherols, for example, α-tocopherol,
Examples include natural or synthetic tocopherols such as β-tocopherol, γ-tocopherol, and δ-tocopherol, and these may be used alone or as a mixture. In particular, α-tocopherol having a large antioxidant property is preferable.

The content of the component (B) of the present invention is as follows.
The amount is 0.0001 to 5 parts by mass, preferably 0.01 to 1 part by mass with respect to 0 parts by mass. The compounding amount is 0.0
If the amount is less than 001 parts by mass, the antioxidant effect cannot be sufficiently obtained, and if the amount is more than 5 parts by mass, the effect of increasing the amount cannot be expected, but rather coloring may occur.

Next, the resin as the base material in the present invention includes:
(C) Polyglycerin having an average degree of polymerization of 2 or more is contained as a component. Examples of the polyglycerin having an average degree of polymerization of 2 or more include diglycerin, triglycerin, tetraglycerin, pentaglycerin, hexaglycerin, and the like. Among them, diglycerin, tetraglycerin, and hexaglycerin are preferable.

The component (C) may be one kind or a mixture of two or more kinds. The content of the component (C) of the present invention is as follows.
The amount is 0.0001 to 5 parts by mass, preferably 0.001 to 2 parts by mass with respect to parts by mass. If the content is less than 0.0001 part by mass, the effect of improving the thermal coloring property of the resin and the effect of imparting hydrophilicity, which are expected as the effect of the component (C), are not exhibited. This is because bleeding may cause the appearance of the product to deteriorate.

The resin composition of the present invention comprises the above (A)
In addition to the components (B) and (C), the composition may further contain vitamin C (ascorbic acid) as the component (D). The compounding amount of the component (D) of the present invention is 0.0001 to 5 parts by mass, preferably 0.01 to 1 part by mass, per 100 parts by mass of the resin. If the content is less than 0.0001 part by mass, the effect of the component (D), such as the improvement in coloring properties, which is expected as an effect of the component (D), may not be exhibited. This is because the size may be large and the product may be damaged.

Further, the resin composition of the present invention comprises the above (A)
In addition to the components (B), (C) and (D), a sorbitan fatty acid ester can be further contained as the component (E). The sorbitan fatty acid ester is preferably a fatty acid ester having 2 to 24 carbon atoms. For example, sorbitan monomyristate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monobehenate, sorbitan monooleate, sorbitan monolaurate, sorbitan monodecanoate, and the like, and sorbitan monooleate and sorbitan monolaurate are preferred. .

The component (E) may be one kind or a mixture of two or more kinds. The content of the component (E) of the present invention is as follows.
It is 0.01 to 10 parts by mass, preferably 0.1 to 5 parts by mass, based on the mass. If the content is less than 0.01 part by mass, the effect of the component (E) such as anti-fogging property may not be exhibited. If the content is more than 10 parts by mass, coloring, bleeding or blooming of the resin may occur. This may cause the appearance of the product to be impaired.

In the resin composition of the present invention, in addition to the above-mentioned components, various additives usually used as additives for resins, for example, organic phosphite compounds and phenol, as long as the effects of the present invention are not impaired. Or sulfur-based antioxidants,
UV absorbers, hindered amine light stabilizers, nucleating agents,
Lubricants, clarifiers, antistatic agents, lubricants, catalyst deactivators, neutralizers (hydrotalcite, metal salts of higher fatty acids), inorganic fillers (calcium carbonate, alkaline earth metal compounds, silica, talc) , Glass fiber), flame retardants, fungicides,
A bactericide, an antibacterial agent and the like can be blended.

Examples of the organic phosphite compound include triphenyl phosphite, tris (2,4-ditert-butylphenyl) phosphite, tris (nonylphenyl) phosphite, tris (dinonylphenyl) phosphite and tris (Mono and di-mixed nonylphenyl) phosphite, bis (2-tert-butyl-4,6-dimethylphenyl) .ethyl phosphite, diphenylacid phosphite, 2,2′-methylenebis (4,6-ditert. Butylphenyl) octyl phosphite, diphenyldecyl phosphite, phenyldiisodecyl phosphite, tributyl phosphite, tris (2-ethylhexyl) phosphite, tridecyl phosphite, trilauryl phosphite, dibutyl acid phosphite,
Dilauryl acid phosphite, trilauryl trithiophosphite, bis (neopentyl glycol)
1,4-cyclohexanedimethyldiphosphite, bis (2,4-ditertbutylphenyl) pentaerythritol diphosphite, bis (2,6-ditertbutyl-4-)
Methylphenyl) pentaerythritol diphosphite, distearylpentaerythritol diphosphite, phenyl-4,4'-isopropylidenediphenol pentaerythritol diphosphite, tetra (C
12-15 mixed alkyl) -4,4'-isopropylidenediphenylphosphite, bis [2,2'-methylenebis (4,6-diamylphenyl)] isopropylidenediphenylphosphite, hydrogenated-4,4 ' -Isopropylidene diphenol polyphosphite, bis (octylphenyl) bis [4,4'-n-butylidenebis (2-tert-butyl-5-methylphenol)]-1,6
-Hexanediol diphosphite, tetratridecyl 4,4'-butylidenebis (2-tert-butyl-5-
Methylphenol) diphosphite, hexa (tridecyl) -1,1,3-tris (2-methyl-5-tert-butyl-4-hydroxyphenyl) butane triphosphonite, 9,10-dihydro-9-oxa-10 -Phosphaphenanthrene-10-oxide, 2-butyl-2
-Ethylpropanediol, 2,4,6-tri-tert-butylphenol monophosphite and the like.

Examples of phenolic antioxidants include:
2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, stearyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, distearyl (3,5 -Di-tert-butyl-
4-hydroxybenzyl) phosphonate, tridecyl
3,5-di-tert-butyl-4-hydroxybenzylthioacetate, thiodiethylenebis [(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 4,
4'-thiobis (6-tert-butyl-m-cresol),
2-octylthio-4,6-di (3,5-ditert-butyl-4-hydroxyphenoxy) -s-triazine, 2,
2'-methylenebis (4-methyl-6-tert-butylphenol), bis [3,3-bis (4-hydroxy-3-
Tertiary butylphenyl) butylic acid] glycol ester, 4,4′-butylidenebis (4,6-ditertiarybutylphenol), 2,2′-ethylidenebis (4
6-di-tert-butylphenol), 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, bis [2-tert-butyl-4-methyl-6-
(2-hydroxy-3-tert-butyl-5-methylbenzyl) phenyl] terephthalate, 1,3,5-tris (2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl) isocyanurate, 1, 3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -2,4 6-trimethylbenzene, 1,3,5-tris [(3,5-ditert-butyl-4-hydroxyphenyl) propionyloxyethyl] isocyanurate, tetrakis [methylene-
3- (3,5-ditert-butyl-4-hydroxyphenyl) propionate] methane, 2-tert-butyl-4-methyl-6- (2-acryloyl-3-tert-butyl-
5-methylbenzyl) phenol, 3,9-bis [2-
(3-tert-butyl-4-hydroxy-5-methylhydrocinnamoyloxy) -1,1-dimethylethyl]-
2,4,8,10-tetraoxaspiro [5.5] undecane], triethylene glycol bis [β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate] and the like.

Examples of the sulfur-based antioxidants include dialkylthiodipropionates such as dilauryl, dimyristyl, myristylstearyl and distearyl esters of thiodipropionic acid; pentaerythritol tetra (β
-Dodecylmercaptopropionate) and the like, and β-alkylmercaptopropionates of polyols and the like.

As the ultraviolet absorber, for example, 2,4-
Dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-tert-butyl-
2-hydroxybenzophenones such as 4 '-(2-methacryloyloxyethoxyethoxy) benzophenone and 5,5'-methylenebis (2-hydroxy-4-methoxybenzophenone); 2- (2-hydroxy-5-methylphenyl) Benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2
-(2-hydroxy-3,5-ditert-butylphenyl)
-5-chlorobenzotriazole, 2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-3-dodecyl-5-methylphenyl) benzotriazole , 2
-(2-hydroxy-3-tert-butyl-5-C7-9 mixed alkoxycarbonylethylphenyl) triazole, 2- (2-hydroxy-3,5-dicumylphenyl) benzotriazole, 2,2′-methylenebis ( 4
2- (2-hydroxyphenyl) benzotriazole such as polyethylene glycol ester of tert-octyl-6-benzotriazolylphenol) and 2- (2-hydroxy-3-tert-butyl-5-carboxyphenyl) benzotriazole And 2- (2-hydroxy-4)
-Hexyloxyphenyl) -4,6-diphenyl-1,
3,5-triazine, 2- (2-hydroxy-4-methoxyphenyl) -4,6-diphenyl-1,3,5-triazine, 2- (2-hydroxy-4-octoxyphenyl) -4,6 -Bis (2,4-dimethylphenyl)-
2- (2-hydroxyphenyl) -1,3,5-triazines such as 1,3,5-triazine; phenyl salicylate, resorcinol monobenzoate, 2,4-ditert-butylphenyl-3,5-di-tert. Tributyl-4-hydroxybenzoate, 2,4-ditert-amylphenyl-
3,5-di-tert-butyl-4-hydroxybenzoate,
Benzoates such as hexadecyl-3,5-ditert-butyl-4-hydroxybenzoate; 2-ethyl-2'-
Substituted oxanilides such as ethoxy oxanilide and 2-ethoxy-4'-dodecyl oxanilide; ethyl-α-cyano-β, β-diphenyl acrylate, methyl-2-
And cyanoacrylates such as cyano-3-methyl-3- (p-methoxyphenyl) acrylate.

Examples of the hindered amine light stabilizer include 2,2,6,6-tetramethyl-4-piperidyl stearate and 1,2,2,6,6-pentamethyl-4.
-Piperidyl stearate, 2,2,6,6-tetramethyl-4-piperidyl benzoate, bis (2,2,
6,6-tetramethyl-4-piperidyl) sebacate,
Bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate , Tetrakis (1, 2, 2,
6,6-pentamethyl-4-piperidyl) -1,2,2
3,4-butanetetracarboxylate, bis (2,
2,6,6-tetramethyl-4-piperidyl) bis (tridecyl) -1,2,3,4-butanetetracarboxylate, bis (1,2,2,6,6-pentamethyl-4-piperidyl)・ Bis (tridecyl) -1,2,
3,4-butanetetracarboxylate, bis (1,
2,2,6,6-pentamethyl-4-piperidyl) -2
-Butyl-2- (3,5-di-tert-butyl-4-hydroxybenzyl) malonate, 1- (2-hydroxyethyl) -2,2,6,6-tetramethyl-4-piperidinol / diethyl succinate Condensate, 1,6-bis (2,
2,6,6-tetramethyl-4-piperidylamino) hexane / dibromoethane polycondensate, 1,6-bis (2
2,6,6-tetramethyl-4-piperidylamino) hexane / 2,4-dichloro-6-morpholino-s-triazine polycondensate, 1,6-bis (2,2,6,6-tetramethyl- 4-piperidylamino) hexane / 2,4-
Dichloro-6-tert-octyl-amino-s-triazine polycondensate, 1,5,8,12-tetrakis [2,4-bis (N-butyl-N- (2,2,6,6-tetramethyl -4-piperidyl) amino) -s-triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,
5,8,12-tetrakis [2,4-bis (N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidyl) amino) -s-triazin-6-yl] -1 ,
5,8,12-tetraazadodecane, 1,6,11-tris [2,4-bis (N-butyl-N- (2,2,6,
6-tetramethyl-4-piperidyl) amino-s-triazin-6-ylamino) undecane, 1,6,11-
Tris [2,4-bis (N-butyl-N- (1,2,2
2,6,6-pentamethyl-4-piperidyl) amino-
(s-triazin-6-ylamino) undecane and the like.

As the nucleating agent, for example, phosphoric acid 2,2'-
Sodium methylenebis (4,6-t-butylphenyl), sodium bis (4-tert-butylphenyl) phosphate, bis (p-methylbenzylidene) sorbitol, alkyl-substituted dibenzylidenesorbitol, bis (p-ethylbenzylidene) sorbitol, etc. Is mentioned. Examples of the lubricant include erucamide, calcium stearate and the like.

The resin composition of the present invention may contain other resins, elastomers, oligomers, etc. other than those described in the present invention, if necessary, as long as the object of the present invention is not impaired. It is. The resin composition of the present invention comprises a resin and the components (A), (B) and (C), and optionally the component (D) or (E), for example, a melt extruder or a Banbury mixer. The melt flow rate can be adjusted and pelletized by a method of melting and kneading in the presence or absence of an organic peroxide. These treatments can be performed in the presence or absence of an inert gas such as nitrogen.

The resin composition of the present invention can be processed and used for various products. The processing method is a method generally used in industry, for example, a T-die film forming method, a tubular film forming method, a compression molding method, an injection molding method, a molding method such as a vacuum molding method, a usual resin product. Manufacturing methods are preferred. If necessary, it is also possible to form a multilayer structure by bonding two or more resins, or to have a laminated structure. In the case of forming a laminated film, although not particularly limited, co-extrusion with a multilayer die is preferred. The resin composition of the present invention is commercialized by the above processing method, and can be used for various applications. For example, packaging of food, fiber, miscellaneous goods and the like, medical use, or use of automobile parts, home electric parts and the like can be mentioned. In particular, the resin composition of the present invention is preferably used for food and medical applications from the viewpoint of its excellent oxidation stability and safety,
In particular, food packaging applications such as food packaging films, stretch films, and food packaging containers are preferred, and the use of food packaging films is most preferred because of its excellent antifogging properties.

[0033]

The present invention will be described in more detail with reference to the following examples. In the following examples, "parts" are based on mass unless otherwise specified.

(Production of resin composition for evaluation 1) 100 parts of linear low density polyethylene resin (density 0.92 g / cm ³ , mass average molecular weight = 51,200), 0.1 part of erucamide, tetrakis [ 0.1 parts of 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxymethyl] methane and 0.1 parts of tris (2,4-di-tert-butylphenyl) phosphite A predetermined amount of the component shown in No. 1 was added, and the mixture was extruded at 230 ° C. to form a pellet.
m was prepared. Anti-fog properties of this film and 5
The thermal stability (thermal coloring property) in a 0 ° C. oven was evaluated. Table 1 shows the results of the antifogging property, and Table 2 shows the thermal coloring property.

<Test method for anti-fogging property> 150 mL of water was put into a 300 mL wide-mouth bottle, the mouth was sealed with a film, and the bottle was placed in a refrigerator at 5 ° C for 1 hour. Examined. The fogging of the film was evaluated on a 5-point scale according to the following criteria. (Criterion criteria) 5: The film is completely transparent and has no fogging. 4: The film is almost transparent, but has slight water droplets. 3: The film has large water droplets but is opaque. 2: Large water droplets adhere to the entire surface of the film, and the film is opaque. 1: The film is opaque with fine water droplets on the front surface.

<Thermal coloring test>
The change in heat coloring (YI) was observed for months. Measuring device: Minolta, spectrocolorimeter CM-3700d Reference standard: ASTM E 313-73 (Test method) First, after white calibration was performed using a white calibration plate, a sample was attached and color measurement was performed. Using the value, YI was determined by the following equation. YI = 100 (1−0.847Z / Y) Here, Y and Z are tristimulus values in the XYZ color system.

[0037]

[0038]

[0039]

(Production of resin composition for evaluation 2) 100 parts of a high-density polyethylene resin (density 0.98 g / cm ³ , mass average molecular weight = 54,500) was added to 100 parts of tetrakis [3-
(3,5-di-tert-butyl-4-hydroxyphenyl)
Propionyloxymethyl] methane (0.05 part), calcium stearate (0.1 part), tris (2,4-di-tert-butylphenyl) phosphite (0.2 part) and components shown in Table 3 are added in predetermined amounts, Extruded at 230 ° C to form pellets, which were injection molded at 250 ° C and 5 cm x 3
A sheet of cm × 2 mm was obtained. The heat resistance was evaluated by the blackening time of this sheet in a 130 ° C. oven. Also,
The thermal colorability was evaluated from the yellowness measured by a Hunter colorimeter at 130 ° C. for 300 hours and the color difference between the original sheet and the color. The surface condition was visually evaluated according to the following criteria. Table 3 shows the results.

(Criteria for judging surface condition) ：: The surface is smooth and glossy. Δ: Appears smooth but lacks luster. X: Irregularities are observed on the surface.

[0042]

[0043]

[0044]

According to the present invention, a resin composition excellent in antifogging property, coloring property, oxidative stability, heat stability and food safety and suitable for food packaging can be provided.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C08L 23/04 C08L 23/04 F term (reference) 4J002 AC111 AF021 BA001 BA011 BB031 BB051 BB061 BB071 BB081 BB121 BB151 BB171 BB001 BP011 BP02 ED028 EH046 EH056 EH059 EH119 EL097 FD070 GG02

Claims (10)

[Claims] 1. A polyolefin resin, a copolymer of an olefin and a vinyl aromatic compound, a copolymer of a vinyl aromatic compound and a conjugated diene or a hydrogenated derivative thereof, a petroleum resin, a terpene resin, a rosin resin, and a chroman. -A resin selected from the group consisting of an indene resin or a hydrogenated derivative thereof, or a copolymer thereof, and 100 parts by mass of the resin or the copolymer, as the component (A), a polyglycerin fatty acid ester 0.
0.01 to 20 parts by mass; tocopherols as component (B) 0.0001 to 5
A resin composition comprising, as component (C), 0.0001 to 5 parts by mass of polyglycerin having an average degree of polymerization of 2 or more. 2. The resin composition according to claim 1, wherein the resin is a polyethylene resin. 3. The tocopherol as the component (B),
The resin composition according to claim 1, which is α-tocopherol. 4. The resin composition according to claim 1, wherein the polyglycerin as the component (C) is diglycerin. 5. The resin composition according to claim 1, wherein the polyglycerin fatty acid ester as the component (A) is a diglycerin fatty acid ester. 6. The resin composition according to claim 1, wherein the polyglycerin fatty acid ester as the component (A) is an ester of oleic acid. 7. Further, vitamin C as a component (D),
With respect to 100 parts by mass of the resin or a copolymer thereof, 0.1 parts by mass.
7. The composition according to claim 1, which contains 0001 to 5 parts by mass.
Item 14. The resin composition according to Item. 8. The method according to claim 1, further comprising, as component (E), 0.01 to 10 parts by mass of a sorbitan fatty acid ester based on 100 parts by mass of the resin or a copolymer thereof. 3. The resin composition according to item 1. 9. The resin composition according to claim 8, wherein the sorbitan fatty acid ester is sorbitan monooleate or sorbitan monolaurate. 10. A resin composition for a food packaging film comprising the resin composition according to any one of claims 1 to 9.