JP3312951B2 - Olefin-based thermoplastic resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an olefin-based thermoplastic resin composition, and more particularly to a olefin-based thermoplastic resin composition which is heat-bonded to a thermoplastic resin container or sheet, and can be easily peeled off from the container or sheet substrate when peeled off. Olefinic thermoplastic resin composition.

[0002]

2. Description of the Related Art Polyolefins such as polyethylene and polypropylene, and thermoplastic resins such as vinyl chloride, polystyrene and thermoplastic polyester are used for their appearance, mechanical strength,
Excellent in moldability, packaging workability, economy, etc., and widely used for various packaging containers. These packaging containers are filled with food products such as dairy products, confectionery, tofu, and soft drinks, and the mainstream packaging containers are heat sealed. There is a demand for not only the protection of objects but also the ability to be easily opened during use. Conventionally, as a heat sealing material for these containers, those coated with a hot melt adhesive or a solution type adhesive have been used, but these have a problem in food hygiene since a sealant adheres to the container side after opening. . In addition, when the same base material as the packaging container is used, a completely sealed state is obtained, and the protection of the contents is sufficient, but it is difficult to open and is practically insufficient.

[0003] In order to improve such disadvantages, various materials have been proposed in recent years, which have both a property of protecting the contents and a property of easy opening. For example, a composition comprising an ethylene-vinyl acetate copolymer and a tackifier is generally known (for example, JP-B-52-50052, JP-A-58-47038, JP-A-58-47038).
-47053). However, in order to satisfy the adhesive strength with the container from the viewpoint of protecting the contents, an ethylene-vinyl acetate copolymer having a relatively high vinyl acetate content or a larger amount of a tackifier is required. Such use of a large amount of vinyl acetate and a tackifier has problems such as film formability and blocking of the formed film, and the ethylene-vinyl acetate copolymer has a low melting point and a low heat resistance. Since it is poor, it can be used for packaging containers used at around normal temperature, but is not suitable for packaging containers requiring heat treatment such as boiling, and is practically insufficient.

[0004]

SUMMARY OF THE INVENTION The present invention has been studied for the purpose of remedying the above-mentioned drawbacks, and as a result, it has been found that an olefin containing an olefin resin, an olefin elastomer, a modified olefin polymer and a tackifier is contained. The present inventors have found that a resin composition can improve all of the above disadvantages, and have completed the present invention. That is, the present invention relates to (a) 20 to 70% by weight of an olefin resin, (b) 10 to 60% by weight of an olefin elastomer, and (c) 30 to 30% by weight of an olefin polymer.
Modified olefin polymer 5 obtained by subjecting 95% by weight and 70 to 5% by weight of a vinyl monomer to a graft reaction condition.
It is a thermoplastic resin composition containing -40% by weight and (d) 5-30% by weight of a tackifier.

The thermoplastic resin composition of the present invention comprises a polyolefin such as polyethylene and polypropylene; a styrene resin such as polystyrene, impact-resistant polystyrene, expanded polystyrene, and acrylonitrile-butadiene-styrene copolymer; polyethylene terephthalate and polybutylene terephthalate Thermoplastic polyesters; halogen-containing resins such as polyvinyl chloride and polyvinylidene chloride; good heat sealability and adhesion to substrates used in various packaging containers such as polycarbonate, and good peelability. And further exhibit good moldability to films, sheets, and the like, and have excellent handling properties such that the obtained films, sheets, and the like do not block during storage.

[0006]

DETAILED DESCRIPTION OF THE INVENTION

(1) Olefin-based resin [Component (a)] As the olefin-based resin constituting one component of the thermoplastic resin composition of the present invention, ethylene, propylene, 1-butene, 1-hexene, 3-methyl-1- Butene, 4-methyl-1-pentene, 1-heptene, 1-octene and the like, or homopolymers or copolymers of two or more olefins having 2 to 12 carbon atoms, preferably about 2 to 8 carbon atoms, or non-olefins with these olefins Examples include conjugated dienes, vinyl esters, unsaturated organic acids or derivatives thereof, and copolymers of vinyl organic silane and the like. The copolymer is random,
Any type of connection with the block or the graft may be used. These olefin-based resins are
Mixtures of more than one species can be used.

[0007] Specific examples of olefin resins include:
High, medium, low density and linear low density polyethylene, polypropylene, ethylene-propylene copolymer (random, block), propylene-butene-1 random copolymer, propylene-ethylene-butene-1 random copolymer, Copolymer of propylene, α-olefin having 5 to 12 carbon atoms and optionally ethylene or butene-1, ethylene-non-conjugated diene copolymer, propylene-non-conjugated diene copolymer, ethylene-propylene-non-conjugated Diene copolymers (specific examples of non-conjugated dienes include dicyclopentadiene, 1,4-hexadiene, 5-methyl-
Examples include 1,4-hexadiene, 7-methyl-1,6-octadiene, 1,8-nonadiene, and 1,9-decadiene. ), Ethylene-vinyl acetate copolymer, ethylene-vinyl trimethoxysilane copolymer, maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, Representative examples include an ethylene-methyl methacrylate copolymer, an ethylene-acrylic acid copolymer, and an ethylene-methacrylic acid copolymer. The MFR of these olefin-based resins is usually 0.1.
1 to 30 g / 10 min, preferably 0.5 to 20 g / 10
Minutes. Among them, polyethylene, polypropylene and ethylene-propylene copolymer are preferred from the viewpoint of film formability, heat resistance and the like.

(2) Olefin elastomer [Component (b)] The olefin elastomer constituting one component of the thermoplastic resin composition of the present invention includes ethylene, propylene,
1-butene, copolymers of α-olefins such as 1-hexene, or copolymers of these with non-conjugated dienes,
Alternatively, it is a homopolymer of a higher α-olefin such as 1-hexene, and is an elastomeric polymer. Among these olefin elastomers, ethylene elastomers are particularly preferred in terms of quality, stability and odor. Specific examples of these elastomers include ethylene-propylene copolymer rubber, ethylene-1-butene copolymer rubber,
Ethylene-propylene-1-butene copolymer rubber, ethylene-propylene-non-conjugated diene copolymer rubber, ethylene-
1-butene-non-conjugated diene copolymer rubber, ethylene-propylene-1-butene-non-conjugated diene copolymer rubber (specific examples of non-conjugated diene include dicyclopentadiene, 1,
4-hexadiene, 5-methyl-1,4-hexadiene, 7-methyl-1,6-octadiene, 1,9-decadiene and the like).

(3) Modified olefin polymer [Component (c)] The modified olefin polymer constituting one component of the thermoplastic resin composition of the present invention is obtained by adding a vinyl monomer to the olefin polymer. It is a modified polymer obtained by subjecting to graft reaction conditions. Such a modified olefin polymer (hereinafter referred to as “modified P”)
O ") is preferably produced by the following method.

1) Raw materials (i) Olefin polymer As the olefin polymer, ethylene, propylene,
1-butene, 1-hexene, 3-methyl-1-butene,
4-methyl-1-pentene, 1-heptene, 1-octene and other olefins having 2 to 12 carbon atoms, preferably about 2 to 8 carbon atoms, or homopolymers or copolymers of two or more olefins, or these olefins and non-conjugated dienes , Vinyl esters, unsaturated organic acids or derivatives thereof, and copolymers of vinyl organic silane and the like. The copolymer may be of any type such as random, block or graft, and may be resinous or elastomeric. These olefin polymers can be used as a mixture of two or more kinds.

[0011] Specific examples of the olefin polymer include:
High, medium, low density and linear low density polyethylene, polypropylene, ethylene-propylene copolymer (random, block), propylene-butene-1 random copolymer, propylene-ethylene-butene-1 random copolymer, Copolymer of propylene, α-olefin having 5 to 12 carbon atoms and optionally ethylene or butene-1, ethylene-non-conjugated diene copolymer, propylene-non-conjugated diene copolymer, ethylene-propylene-non-conjugated Diene copolymers (specific examples of non-conjugated dienes include dicyclopentadiene, 1,4-hexadiene, 5-methyl-
Examples include 1,4-hexadiene, 7-methyl-1,6-octadiene, and 1,9-decadiene. ), Ethylene-vinyl acetate copolymer, ethylene-vinyl trimethoxysilane copolymer, maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, Representative examples include an ethylene-methyl methacrylate copolymer, an ethylene-acrylic acid copolymer, and an ethylene-methacrylic acid copolymer. Among them, polyethylene, polypropylene and ethylene-propylene copolymer are preferred in view of thermal stability.

(Ii) Vinyl Monomer The vinyl monomer used for producing the modified PO is not particularly limited, but specifically, styrene,
Unsaturated aromatic monomers such as 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, dimethylstyrene, and chlorostyrene; vinyl esters such as vinyl acetate and vinyl propionate; methyl acrylate, ethyl acrylate, and isopropyl acrylate Acrylates such as n-butyl acrylate, sec-butyl acrylate, dodecyl acrylate, 2-ethylhexyl acrylate, hexyl acrylate, and octyl acrylate; methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, sec-butyl methacrylate, decyl methacrylate; Methacrylic esters such as 2-ethylhexyl methacrylate and glycidyl methacrylate; acrylic acid, methacrylic acid, maleic anhydride, maleic acid Dimethyl, unsaturated organic acids such as maleic acid di (2-ethylhexyl) acrylonitrile,
Unsaturated nitriles such as methacrylonitrile; and unsaturated mono- or di-halides such as vinyl chloride and vinylidene chloride. Among them, styrene and methyl methacrylate are preferred because they can be easily modified.

The olefin polymer and the vinyl monomer are contained in an amount of 30 to 95% by weight, preferably 40 to 70% by weight.
And 70 to 5% by weight, preferably 60 to 30% by weight, are subjected to graft reaction conditions, but a radical generator is usually used except for the reaction by radiation.

(Iii) Radical generator As the radical generator used for producing the modified PO, general-purpose ones can be used, but in view of a preferred graft reaction method described later, Those having a decomposition temperature of 50 ° C. or more and being oil-soluble are preferred. Here, the “decomposition temperature” means a temperature at which 0.1 mol of a radical generator is added to 1 liter of benzene.
This is the temperature at which the decomposition rate of the radical generator becomes 50% when left for a long time. It means the so-called "decomposition temperature for obtaining a half-life of 10 hours". When a polymer having a low decomposition temperature is used, the polymerization of the vinyl monomer may proceed abnormally, and there is a disadvantage that a homogeneous modified polymer cannot be obtained. However, conversely, decomposition temperature is made to combine stepwise or continuously by appropriately combining high and low decomposition temperatures,
The graft reaction can be performed efficiently.

Examples of such a radical generator include 2,4-dichlorobenzoyl peroxide, t-butylperoxypivalate, o-methylbenzoyl peroxide, bis-3,5,5-trimethylhexanoyl peroxide. Octanoyl peroxide, benzoyl peroxide, t-butylperoxy-2-ethylhexanoate, cyclohexanone peroxide, 2,5-dimethyl-2,5-dibenzoylperoxyhexane, t-butylperoxybenzoate, Jee
t-butyl-diperoxyphthalate, methyl ethyl ketone peroxide, dicumyl peroxide, di-t
Organic peroxides such as -butyl peroxide; and azo compounds such as azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile). The amount of the radical generator used is 0.01 to 1 based on the amount of the vinyl monomer used.
Within the range of about 0% by weight, the amount is appropriately adjusted depending on the type of radical generator and reaction conditions. If the amount used is less than this amount, the reaction does not proceed smoothly, while if it exceeds this amount, a gel is easily formed in the modified PO and the effect of the present invention is hardly exhibited.

2) Production of Modified PO These raw materials are subjected to a graft polymerization reaction to modify the modified PO.
The production by the aqueous suspension grafting method described below is a particularly preferable method in that the gel content can be easily controlled. That is, the temperature of the aqueous suspension containing the olefin polymer particles, the vinyl monomer and the radical generator is raised to a temperature at which decomposition of the initiator does not substantially occur, and the vinyl monomer is treated with the olefin polymer. After the polymer particles have been impregnated, it is preferable to further raise the temperature of the aqueous suspension to complete the polymerization of the vinyl monomer. This method will be described.

(I) Impregnation Step As a typical preferred method for impregnating the olefin polymer particles with the vinyl monomer in an aqueous medium, a preferred method is to use a radical generator ( And, if necessary, other vinyl monomers in which the additive is dissolved) and stirring, or add an olefin polymer particle to the aqueous dispersion of the vinyl monomer in which the radical generator is dissolved. Start by the method of stirring. In the impregnation step, the temperature should be raised industrially to a temperature at which the radical generator is not substantially decomposed, and the impregnation should be carried out efficiently.
It is preferred to operate at 0 ° C. In this step, the vinyl monomer is impregnated so that the amount of the free vinyl monomer is 80% by weight or less of the used amount of the vinyl monomer. Since the olefin polymer is relatively compatible with the vinyl monomer, even if 80% by weight or less of the vinyl monomer is released before the start of the polymerization, these vinyl monomers remain in the olefin polymer during the polymerization. Since the particles are impregnated, the polymer particles obtained by polymerizing these vinyl monomers do not precipitate independently of the modified olefin-based polymer particles. The impregnation time is usually about 2 to 8 hours. The content of the olefin polymer and the vinyl monomer in the aqueous dispersion is 5 to 1 with respect to 100 parts by weight of water.
It is usually about 00 parts by weight.

Such an aqueous dispersion can be stably maintained in a dispersed state simply by sufficiently stirring, but the use of an appropriate suspension stabilizer makes the suspension dispersion easier and more stable. Can be adjusted. Examples of the suspension stabilizer in this case include water-soluble polymers such as polyvinyl alcohol, methylcellulose, and hydroxycellulose; anionic surfactants such as alkylbenzene sulfonate; nonionic surfactants such as polyoxyethylene alkyl ether; Or a water-insoluble inorganic salt such as magnesium oxide, calcium phosphate or the like is used alone or as a mixture in an amount of about 0.01 to 10% by weight based on water. When impregnating the olefin polymer particles with a vinyl monomer (and a radical generator and the like), a plasticizer, a lubricant,
Auxiliary materials such as antioxidants can be impregnated at the same time (these auxiliary materials may already be added to the olefin polymer, or may be added after the graft polymerization reaction).

(Ii) Graft polymerization step If the temperature of the aqueous suspension prepared as described above is raised to a temperature at which the used radical generator decomposes at a suitable rate or higher, the impregnated vinyl monomer Undergoes graft polymerization to produce modified PO particles. It is preferable that the aqueous suspension during the graft polymerization is appropriately stirred. The polymerization temperature should generally be appropriately selected within the range of 50 to 150 ° C., but need not be constant throughout the graft polymerization step. The polymerization is usually for about 2 to 10 hours. The polymerization pressure is usually from normal pressure to about 10 kg / cm ² . Further, in order to control the molecular weight of the polymer resulting from the polymerization of the vinyl monomer, n-
Butyl mercaptan, n-dodecyl mercaptan, t-
It is advisable to add a chain transfer agent such as dodecyl mercaptan. After the polymerization, a post-treatment similar to the post-treatment of the aqueous suspension polymerization of a normal vinyl monomer (for example, styrene) is carried out, so that the shape of the olefin polymer particles used is almost maintained and the molding material is immediately used. The resulting modified PO particles can be used as Therefore, the olefin polymer used before the modification may be in a powder form, but it is more convenient to be in a particulate form in consideration of handling during the subsequent molding. That is, the particle size is preferably such that it is generally used as a molding material because the resulting modified PO can be used as it is as a molding material, and generally has an average particle diameter of 1 to 8 mm, preferably 3 to It is about 7 mm. The dimensions do not change much before and after the modification treatment.

(4) Tackifier [Component (d)] The tackifier constituting one component of the present invention is an aliphatic, alicyclic or aromatic having a softening point (ring and ball method) of 80 to 180 ° C. Rosin resins such as rosin, rosin ester, hydrogenated rosin, and polymerized rosin; α-pinene polymer, β-pinene polymer, dipentene polymer, terpene-phenol Terpene resins such as polymers; C _{5 to} C ₉ petroleum resins and hydrogenated products thereof. These tackifiers can be used as a mixture of two or more kinds. Above all, an alicyclic polymer low polymer is preferable in terms of hue and odor, and specifically, a hydrogenated product of a petroleum resin is preferable. The softening point (ring and ball method) of these tackifiers is generally 80 to 180 ° C, preferably 100 to 170 ° C, more preferably 120 to 160 ° C,
Most preferably, those having a temperature of 130 to 150 ° C. can be used. However, depending on the application, it is also effective to use a mixture having a low softening point and a high softening point.

(5) Mixing ratio of each component The ratio of each component in the composition of the present invention is (a) 20 to 70% by weight of the olefin resin, preferably 25 to 60%.
% By weight, (b) olefin-based elastomer 10 to 60
% By weight, preferably 15 to 40% by weight, (c) modified PO
5-40% by weight, preferably 10-25% by weight, and (d) tackifier 5-30% by weight, preferably 10
-20% by weight. If the content of the olefin-based resin is less than the above, the moldability is insufficient, and if it is more than the above, the adhesiveness is not satisfactory. On the other hand, if the content of the olefinic elastomer is less than the above range, the adhesive property is insufficient, and if the content exceeds the above range, the object of the present invention is not achieved in terms of moldability. On the other hand, if the content of the modified PO is less than the above, it is not preferable in terms of handling such as blocking of a film and a sheet, and if it is more than the above range, it is insufficient in controlling the releasability.
Further, if the amount of the tackifier is less than the above range, the adhesive strength is insufficient, and if the amount is more than the above range, it is not preferable in terms of handling such as blocking.

The ratio of the tackifier (d) to the olefin-based elastomer (b) is preferably from 1: 1.5 to 5, more preferably from 1: 2 to 4, by weight. If the weight ratio is out of this range, the adhesive strength is not satisfactory in terms of stability over time. Furthermore, the weight ratio of the tackifier (d) to the modified olefin polymer (c) is 1: 0.25 to 4, especially 1: 0.5 to 3, especially 1 to 1 to 2. preferable. If the weight ratio is out of this range, it is not preferable in terms of handling such as adhesive strength and blocking.

[0023] In addition to these essential components, additional components can be added to the composition of the present invention in amounts not to impair the effects of the present invention. Additional components include, for example, other thermoplastic resins, rubber substances, inorganic fillers, pigments, plasticizers, various stabilizers (antioxidants, antistatic agents, light stabilizers,
Anti-blocking agent, lubricant) and the like.

(6) Production of Composition The composition can be obtained by dry-blending the above components and directly molding. Generally, the composition is previously kneaded with a usual kneader such as a roll, a Banbury mixer, or an extruder. It is subjected to post molding. The molding can be performed by any method such as injection molding, hollow molding, extrusion molding, and compression molding.

[0025]

【Example】

Example 1 Process for Producing Modified PO Particles An aqueous medium was prepared by mixing 20 kg of water, 0.6 kg of tribasic calcium phosphate as a suspending agent, and 0.6 g of sodium dodecylbenzenesulfonate in a 50-liter autoclave. 6 kg of low-density polyethylene having a diameter of 3 to 4 mm (density: 0.92 g / cm ³ , MFR: 45 g / 10 minutes) was added, and the mixture was stirred and suspended. Separately, 15.6 g of 3,5,5-trimethylhexanoyl peroxide and 9 g of benzoyl peroxide were dissolved in 6 kg of styrene monomer, added to the above suspension system, and nitrogen was introduced into the autoclave. The inside was pressurized to 0.5 kg / cm ² . Further, the inside of the autoclave was heated to 55 ° C., and left at this temperature for 5 hours while stirring to impregnate the low-density polyethylene particles entirely with the styrene monomer containing the polymerization initiator. Next, the temperature of the suspension was raised to 65 ° C., and the mixture was left standing for 7 hours while stirring at this temperature to carry out polymerization. The temperature was further raised to 110 ° C. and maintained for 3 hours to complete the polymerization. After cooling, the solid content is taken out, washed with water, and modified low density polyethylene particles 12k.
g was obtained. The MFR of the resulting modified low-density polyethylene was 2.5 g / 10 minutes.

Preparation of thermoplastic resin composition Low-density polyethylene 25% by weight, ethylene-butene-1
40% by weight of a copolymer rubber, 15% by weight of a modified low-density polyethylene obtained in the above production process, and an alicyclic saturated hydrocarbon resin ("Alcon P-" manufactured by Arakawa Chemical Industries, Ltd.) as a tackifier.
140 ″; ring and ball method softening point 140 ° C.) 15% by weight, and using a single screw extruder (L / D = 23), resin temperature 18
The mixture was melted and mixed at 0 ° C. to obtain pellets (MFR: 6 g / 10 minutes).

Production and Evaluation of Thermoplastic Resin Film The pellets of the thermoplastic resin composition obtained above were molded at a molding temperature of 230 mm using a Placo 35 mm T die molding machine.
At 30 ° C., a film having a thickness of 30 μm was formed. This film and 9
A μ-thick aluminum foil was bonded with an adhesive to form a laminated film. The layer of the thermoplastic resin composition of the laminated film was used as an adhesive surface, and was adhered by heating to various substrates. The heat bonding conditions were as follows: using a hot plate type heat sealer, the bonding surface was 5 mm.
Width, bonding pressure 2kg / cm ² , time 1 second, bonding temperature 140 ~
220 ° C. About the obtained composite sheet, 180 degree peeling strength was measured at 23 degreeC with the sample width of 15 mm and the pulling speed of 300 mm / min using the Shopper type tensile tester. The results are shown in Table 1. On the other hand, as an evaluation of the blocking properties of the obtained films, the films obtained by superposing the films obtained by the T-die molding, applying a load of 50 g / cm ² , leaving them in a 45 ° C. atmosphere for 24 hours, and then measuring the peeling strength were obtained. . The results are shown in Table 1.

Examples 2 to 4 The thermoplastic resin compositions shown in Table 1 were evaluated in the same manner as in Example 1. The results are shown in Table 1.

Comparative Examples 1 to 3 The thermoplastic resin compositions shown in Table 1 were evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0030]

[Table 1]

* 1) LDPE: low-density polyethylene (density: 0.92 g / cm ³ , MFR: 8 g / 10 min) (“Mitsubishi Polyethylene LD LM31” manufactured by Mitsubishi Yuka) * 2) PP: polypropylene (density: 0.89) g / cm ³ , MF
R: 6g / 10min) (Mitsubishi Yuka Corporation “Mitsubishi Polypropylene FX”
4 ") * 3) EVA: Ethylene-vinyl acetate copolymer (vinyl acetate content: 25% by weight, MFR: 2 g / 10 minutes) (" Mitsubishi Polyethylene EVA V505 "manufactured by Mitsubishi Yuka Co., Ltd.) * 4) EPR-1 : Ethylene-butene-1 copolymer rubber (density: 0.88 g / cm ³ , MFR: 6.7 g / 10 min) (“Tuffmer A4085” manufactured by Mitsui Petrochemical Co., Ltd.) * 5) EPR-2: ethylene-propylene copolymer Combined rubber (density: 0.86 g / cm ³ , MFR: 3.2 g / 10 min) (“EP02P” manufactured by Nippon Synthetic Rubber Co., Ltd.) * 6) “Denka Styrol HI-E4” manufactured by Denki Kagaku Co., Ltd. * 7) Mitsubishi Yuka "Mitsubishi Polypro PF250B" * 8) "Diamondite PA500" manufactured by Mitsubishi Rayon
X "* 9)" Vinika Compound D-12 manufactured by Mitsubishi Chemical Corporation
6 "* 10)" Iupilon E-200 "manufactured by Mitsubishi Gas Chemical Company * 11) Peeled state ○: Peel strength less than 200g / 10cm ² ×:
Peel strength 200g / 10cm ² or more

Example 5 Lamination was carried out in the same manner as in Example 2 except that an alicyclic saturated hydrocarbon resin ("Alcon P-115; Ring and ball softening point 115 ° C" manufactured by Arakawa Chemical Industries) was used as a tackifier. Films were manufactured and their performance was evaluated. Table 2 shows the results.

Example 6 Lamination was carried out in the same manner as in Example 2 except that an alicyclic saturated hydrocarbon resin ("Alcon P-125; Ring and ball softening point 125 ° C" manufactured by Arakawa Chemical Industries) was used as a tackifier. Films were manufactured and their performance was evaluated. Table 2 shows the results.

Example 7 In Example 2, rosin ester ("KE-354" manufactured by Arakawa Chemical Industries, Ltd .; ring and ball softening point 105) was used as a tackifier.
１１３113 ° C.) except that a laminated film was produced and its performance was evaluated. The results are shown in Table 2.

[0035]

[Table 2]

Reference Examples 1-2 The composite sheets obtained in Examples 2 and 3 were treated at 40 ° C. for 1 hour.
The peel strength after storage for months was measured. The results are shown in Table-3.

[0037]

[Table 3]

[0038]

Industrial Applicability The thermoplastic resin composition of the present invention has a good heat sealing property with respect to a substrate used for various packaging containers such as polyolefin, styrene resin, thermoplastic polyethylene, polyvinyl chloride and polycarbonate. , Adhesive and release properties, exhibit good moldability to films, sheets, etc., and have excellent handling properties such that the resulting films, sheets, etc. do not block during storage, and are extremely practical It has excellent properties.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 23/00-23/36 C08L 51/00-51/10

Claims (2)

(57) [Claims] (1) (a) an olefin-based thermoplastic resin 20 to
70 wt%, (b) an olefinic elastomer 15-40% by weight, and 30 to 95 wt% (c) an olefin polymer particles Steel
Len, 2-methylstyrene, 3-methylstyrene, 4-
Methylstyrene, dimethylstyrene, chlorostyrene
At least one vinyl monomer selected from the group consisting of
Aqueous suspension containing 0 to 5% by weight and a radical generator
At a temperature at which decomposition of the radical generator does not substantially occur.
Temperature and the amount of free vinyl monomer is all vinyl monomer
Vinyl monomer so that the amount of the vinyl monomer is 80% or less.
The aqueous suspension is impregnated with the vinyl polymer particles.
To complete the grafting reaction.
An olefin-based thermoplastic resin composition comprising 5 to 40% by weight of a modified olefin-based polymer to be obtained and (d) 5 to 30% by weight of a tackifier. 2. The weight ratio of the tackifier (d) to the olefinic elastomer (b) is 1: 1.5 to 5;
And a tackifier (d) and a modified olefin polymer (c)
The olefin-based thermoplastic resin composition according to claim 1, wherein the weight ratio is 1: 0.25 to 4.