JPH03244656A - Polyester resin composition, and packaging material made therefrom - Google Patents

Abstract

PURPOSE:To improve moldability, mechanical properties, thermal adhesion properties, and transparency by compounding a specific polyester, a modified polyester, and a polycarbonate. CONSTITUTION:A polyester having a reduced viscosity of 0.5 or higher is prepd. by reacting a dicarboxylic acid component contg. 40-100 mol % terephthalic acid, 0-60 mol % arom. dicarboxylic acid other than terephthalic acid, and 0-20 mol % aliph. or cycloaliph. dicarboxylic acid with a glycol component contg. 40-100 mol % ethylene glycol and 0-60 mol % aliph. or cycloaliph. glycol. Separately, a modified polyester having a reduced viscosity of 0.5 or higher is prepd. by reacting an unsatd. dicarboxylic acid (anhydride)with a polyester obtd. by reacting a dicarboxylic acid component contg. 40-100 mol % terephthalic acid, 0-60 mol % arom. dicarboxylic acid other than terephthalic acid, and 0-20 mol % aliph. or cycloaliph. dicarboxylic acid with a glycol component contg. 50-90 mol % ethylene glycol and 50-10 mol % 1,4- cyclohexanedimethanol. 88-20 pts.wt. said polyester, 2-30 pts.wt. said modified polyester, and 10-50 pts.wt. polycarbonate having a wt.-average mol.wt. of 10,000-100,000 are compounded.

Description

[Detailed description of the invention] (Industrial application field) The present invention has moldability, mechanical properties, and thermal adhesion.

and polyester resin compositions with excellent transparency; and packaging materials using the same, especially 9 foods and pharmaceuticals.

Suitable for use in packaging materials for cosmetics, etc.
It is extremely unlikely that the medicinal ingredients, aroma components, etc. contained in the packaged article will be adsorbed, and the odor of the packaging material itself will not be transferred to the article, making it possible to store the article in good condition. related to packaging materials.

(Prior Art) Conventionally, packaging materials (including films, sheets, containers, etc.) for various foods, beverages, pharmaceuticals, cosmetics, etc. have been used for reasons such as being lightweight and easy to manufacture. Various plastic bottles, sheets, bags, etc. are used. Furthermore, laminates made by laminating plastic sheets and cardboard are suitably used for so-called paper packs for milk, soft drinks, alcoholic beverages, soy sauce, and the like. Plastics used in these materials include polyethylene, polypropylene, and ethylene-vinyl acetate copolymers. However, such resins adsorb aroma components of the packaged items.

Due to the diffusion, it has the disadvantage of reducing the flavor and quality of the article. A further disadvantage is that the odor of the resin itself is transferred to the packaged article. In general, foods, medicines, cosmetics, and the like have odorous components. For example, soft drinks such as orange juice are D-
Limonene, decanal, etc. are used in confectionery, methyl salicylate, vanillin, etc. are used in soy sauce and sauces, 3-methylthiolborobyl alcohol, eugenol, etc., and dental oral medicines include anethole, l-menthol, etc.

Benzaldehyde and citral in cosmetics and soaps.

Contains fragrances such as geranyl acetate. Therefore, there is a need for a resin that does not adsorb or desorb the above-mentioned odorous components.

As a resin that rarely adsorbs or desorbs odor components,
Ethylene-vinyl alcohol copolymer.

It has been proposed to use resins with high gas barrier properties such as metaxylylene group-containing polyamide resin (hereinafter abbreviated as MX Rho 6 nylon) and polyethylene terephthalate. Furthermore, it has also been proposed to use metal foils such as aluminum foils and metal foil laminated films such as aluminum vapor-deposited films.

For example, when a paper pack made of a laminate of resin and cardboard is used as a container for milk, soft drinks, alcoholic beverages, etc., it is preferable that the resin has heat sealability. If the resin has heat-sealing properties,
This is because the paper pack injected with this content can be easily closed by heat sealing. However, when resins such as the above-mentioned ethylene-vinyl alcohol copolymer, MXD-6 nylon, and polyethylene terephthalate are used.

These resins have high melting points and therefore require high temperatures for heat sealing. In order to perform heat sealing well, it is necessary to further attach a film with excellent heat sealability to the film surface of the laminate using an adhesive.

Therefore, productivity decreases and costs increase.

(Problem to be solved by the invention) The present invention solves the above-mentioned conventional drawbacks.

The purpose is to provide a polyester resin composition that has excellent moldability, mechanical properties, thermal adhesion, and transparency, and can be suitably used as packaging materials for foods, pharmaceuticals, cosmetics, etc. . Another object of the present invention is to provide a packaging material that hardly adsorbs medicinal ingredients, aromatic components, etc. contained in the article for packaging, and does not transfer its own odor to the article. There is a particular thing. Still another object of the present invention is to provide a packaging material formed by processing the above-mentioned resin composition into a film, or by laminating the films into a laminate.

(Means for Solving the Problems) The polyester resin composition of the present invention comprises polyester (A
), modified polyester (B), and polycarbonate as main components, and the polyester (A) is.

A dicarboxylic acid component containing 40 to 100 mol% of terephthalic acid, 0 to 60 mol% of an aromatic dicarboxylic acid other than terephthalic acid, and 0 to 20 mol% of an aliphatic or alicyclic dicarboxylic acid, and 40 to 100 mol% of ethylene glycol. , and a glycol component containing 60 to 0 mol% of aliphatic or alicyclic glycol other than ethylene glycol, and the modified polyester (B) contains 40 to 0 mol% of terephthalic acid.
a dicarboxylic acid component containing 100 mol%, 0 to 60 mol% of an aromatic dicarboxylic acid other than terephthalic acid, and 0 to 20 mol% of an aliphatic or alicyclic dicarboxylic acid, 50 to 90 mol% of ethylene glycol, and 1. It is obtained by reacting an unsaturated dicarboxylic acid or its anhydride with a polyester obtained from a glycol component containing 50 to 10 mol% of 4-cyclohexanedimethanol, thereby achieving the above object.

The packaging material of the present invention contains the above polyester resin composition, thereby achieving the above object.

Specific examples of the dicarboxylic acid component constituting the polyester (^) contained in the resin composition of the present invention include the following compounds: terephthalic acid diisophthalic acid. Aromatic dicarboxylic acids other than terephthalic acid, such as orthophthalic acid, naphthalene dicarboxylic acid, and biphenyl dicarboxylic acid;
Aliphatic dicarboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanniic acid, dimer acid; and barnyard grass. Alicyclic dicarboxylic acids such as 4-cyclohexanedicarboxylic acid and 1,3-cyclohexanedicarboxylic acid.

As the dicarboxylic acid component, 9-terephthalic acid and isophthalic acid are preferred.

Specific examples of the glycol component constituting the above polyester (^) include the following compounds: ethylene glycol; 1,3-propanediol, 1,4-butanediol, 1.5-bentanediol, 1,6 - Aliphatic glycols other than ethylene glycol such as hexanediol, 3-methyl-1,5-bentanediol, neopentyl glycol; and 1,4-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1.
2-Cyclohexane dimethanol.

2. Alicyclic glycols such as 2-bis(4°-β-hydroxyethoxyphenyl)propane. As the glycol component, ethylene glycol is preferred.

The polyester (A) contained in the composition of the present invention contains 40 to 100 mol% of terephthalic acid, preferably 55 to 80% by mole of terephthalic acid.
Mol%, aromatic dicarboxylic acid other than terephthalic acid 0-6
with a dicarboxylic acid component comprising 0 mol %, preferably 20-45 mol %, and an aliphatic or cycloaliphatic dicarboxylic acid 0-20 mol %, preferably 0-10 mol %; ethylene glycol 40-100 mol %, preferably is 50 to 90 mol%, and 60 to 0 mol% of aliphatic or alicyclic glycol other than ethylene glycol, preferably 50 to 10 mol%.
glycol component containing mol %. In the dicarboxylic acid component, the proportion of terephthalic acid is less than 40 mol%.

and the proportion of aromatic dicarboxylic acids other than terephthalic acid is 6
When it exceeds 0 mol %, the molding processability of the resin composition is reduced, and the mechanical properties and heat resistance of the obtained molded article (film, etc.) are reduced. If the proportion of the aliphatic or alicyclic dicarboxylic acid exceeds 20 mol %, the surface hardness, strength, and heat resistance of the resulting molded article will decrease.

On the other hand, in the glycol component, the proportion of ethylene glycol is less than 40 mol%, and the proportion of aliphatic or alicyclic glycol other than ethylene glycol is 60% by mole.
If the amount exceeds mol %, the molding processability of the resin composition obtained will be reduced, and the appearance of the obtained molded product will be impaired, as well as its mechanical properties will be reduced.

Modified polyester (B) contained in the resin composition of the present invention
) is obtained by graft polymerizing an unsaturated dicarboxylic acid or its anhydride to a polyester obtained from the following dicarboxylic acid component and glycol component. As the dicarboxylic acid component forming the unmodified polyester, the same dicarboxylic acid component as the dicarboxylic acid component of the polyester (^) can be used. Preferably terephthalic acid and isophthalic acid are used. As the glycol component, ethylene glycol and 1,4-cyclohexanedimethanol are used. Examples of the unsaturated dicarboxylic acid used as a modifier for the unmodified polyester include maleic acid and fumaric acid.

Examples include itaconic acid. It is also possible to use acrylic acid, crotonic acid, etc. in combination with these dicarboxylic acids. Furthermore, anhydrides of these unsaturated dicarboxylic acids may also be used. Preferably, maleic anhydride is used. The unmodified polyester that is the raw material for the above modified polyester (8) contains 40-100 mol% of terephthalic acid.
, preferably 55 to 80 mol%, aromatic dicarboxylic acids other than terephthalic acid 0 to 60 mol%, preferably 20 to 4 mol%
5 mol%, and 0 to aliphatic or alicyclic dicarboxylic acid
a dicarboxylic acid component comprising 20 mol%, preferably 0-10 mol%; ethylene glycol 50-90 mol%, preferably 60-80 mol%, and 1,4-cyclohexanedimethanol 50-10 mol%; Preferably 40~
and a glycol component containing 20 mol%.

In the dicarboxylic acid component constituting the unmodified polyester, the proportion of terephthalic acid is less than 40 mol%, and the proportion of aromatic dicarboxylic acids other than terephthalic acid is 60% by mole.
If the amount exceeds mol %, the molding processability of the resin composition decreases, and the heat resistance and strength properties of the resulting molded product decrease, although this is not the case with the above-mentioned polyester (^). On the other hand, in the glycol component of the unmodified polyester, 1.
When the proportion of 4-cyclohexanedimethanol is less than 10 mol%, graft polymerization with an unsaturated dicarboxylic acid or its anhydride becomes difficult to occur when preparing a modified polyester as described below. As a result, the resulting modified polyester (B) cannot improve the compatibility between the polyester (^) and polycarbonate, resulting in poor molding processability and loss of strength and transparency of the resulting molded product. vice versa.

When the proportion of 1.4-cyclohexanedimethanol exceeds 40 mol%, graft polymerization with unsaturated dicarboxylic acids and their anhydrides tends to occur during the preparation of modified polyesters. For this reason, the obtained modified polyester (B
) improves the compatibility between polyester (A) and polycarbonate. Therefore, the resulting resin composition has excellent flow characteristics and transparency. However, the heat resistance and fragrance retention of molded articles obtained using this composition are reduced.

The modified polyester (B) contains 5 to 60 moles of the unsaturated dicarboxylic acid or its anhydride per 106 g of the unmodified polyester.

It is preferably added in a proportion of 10 to 50 moles and is obtained by graft polymerization by a conventional method. This graft polymerization is carried out in a solvent such as 1,4-dioxane or in a molten state. In the graft polymerization, an organic peroxide is used as a catalyst, and examples of the organic peroxide include dicumyl peroxide, t-butylcumyl peroxide, and benzoyl peroxide. The obtained modified polyester (B) has a function of improving the compatibility between the polyester (A) and the polycarbonate described below. The ratio of the unsaturated dicarboxylic acid or its anhydride is 5
When the amount is less than mol/10'g, the modified polyester (B)
can hardly improve the compatibility between polyester (A) and polycarbonate. Conversely, 60 moles/10
If it exceeds 'g, the heat resistance of the molded article obtained using the resin composition will decrease, and the appearance and strength properties of the molded article will be impaired.

The polycarbonate contained in the composition of the present invention can be obtained by a known method such as a transesterification method or a phosgene method.

The weight average molecular weight (measured by light diffusion method) of the obtained polycarbonate is preferably to, ooo to too,
ooo, more preferably 20.000 to 80.0
It is 00. The weight average molecular weight of polycarbonate is 10
．． When it is less than 000, the strength characteristics of the molded product obtained are slightly reduced. On the other hand, if it exceeds 100.000, you can get
The flow characteristics of the resin composition deteriorate slightly, resulting in a decrease in moldability.

The reduced viscosities of the polyester (A) and modified polyester (B) contained in the resin composition of the present invention are preferably both 0.5 or more, more preferably 0.6 or more.

If the reduced viscosity is less than 0.5, it may not be possible to impart desired mechanical properties, particularly strength properties, to the resulting molded product. The reduced viscosity here is a value measured at 30°C using a phenol-tetrachloroethane mixed solvent (60740V/V).

The thermoplastic polyester resin composition of the present invention includes:

88 to 20 parts by weight of polyester (A) (hereinafter referred to as 1 part), 2 to 30 parts of modified polyester (B), and 10 to 50 parts of polycarbonate; preferably 75 to 40 parts of polyester (A), modified Polyester (B) is 5
~20 parts, and polycarbonate in a proportion of 20 to 40 parts. If the content of modified polyester (8) is less than 2 parts, the compatibility between polyester (A) and polycarbonate cannot be sufficiently improved. Therefore, the toughness of the obtained molded product is insufficient. On the other hand, if it exceeds 30 parts, the heat resistance and aroma retention properties of the resulting molded product will decrease. Polycarbonate has the effect of delaying crystallization of polyester (A) and lowering its crystallinity. Therefore, the impact resistance of polyester (A) is improved.

Therefore, if the polycarbonate content is below 10 parts.

As a result, the crystallization of polyester (A) cannot be delayed and its crystallinity becomes high.

The impact resistance of the molded article obtained using the composition becomes low.

On the other hand, if it exceeds 50 parts, the molding processability of the resin composition decreases, and the chemical resistance and fragrance retention of the resulting molded article decreases.

In order to improve the flow characteristics of the resin composition of the present invention, a trifunctional or higher functional polycarboxylic acid may be copolymerized with each of the polyester (A) and the modified polyester (B). Examples of the above-mentioned polycarboxylic acids include trimellitic acid and pyromellitic acid.

There are trimesic acids and anhydrides of these compounds. The amount of this trifunctional or higher functional polycarboxylic acid is 5 mol% or less based on the total dicarboxylic acid components of each of the polyester (8) and the modified polyester (B).

It is preferably contained in a proportion of 0.5 to 3 mol%.

When the content of the trifunctional or more functional polycarboxylic acid exceeds 5 mol %, the resulting resin composition will have poor moldability.

Similarly, in order to improve the flow characteristics of the resin composition of the present invention, a trifunctional or higher functional polyol may be copolymerized with each of the polyester (A) and the modified polyester (B). Examples of the above polyol include glycerin and trimethylolethane.

Trimethylolpropane, and pentaerythritol. This trifunctional or higher functional polyol is polyester (
5 mol% or less, preferably 0.5 mol% or less, based on the total glycol components of each of A) and modified polyester (B)
It is contained in a proportion of ~3 mol%. If the content of the trifunctional or higher functional polyol exceeds 5 mol%, the resulting resin composition will have poor moldability.

The resin composition of the present invention may contain the following resins singly or in combination without impairing its physical properties: styrene resin, acrylic resin, fluororesin,
polyamide resin, polyarylate resin, polysulfone,
Polyolefins (e.g. ethylene-vinyl acetate copolymers, polyester elastomers, various ionomers)
thermoplastic resins such as; and thermosetting resins such as phenolic resins, melamine resins, unsaturated polyester resins, and silicone resins.

The resin composition of the present invention may further contain various additives to improve other properties within a range that does not impair physical properties.

For example, a nucleating agent may be included for the purpose of increasing the crystallization rate of the resin and increasing the productivity during molding. As a material for the nucleating agent,
Inorganic substances (e.g. carbonates of alkaline earth metals such as calcium carbonate and magnesium carbonate; sulfates of alkaline earth metals such as calcium sulfate; metal oxides such as titanium oxide, aluminum oxide, and zinc oxide;
talc; graphite; aluminum silicate; clay, etc.); metal salts of organic acids such as stearates, benzoates, salicylates, tartrates, montanates.

terephthalates); and α-olefins and α.

Examples include ionic copolymers consisting of β-unsaturated carboxylic acid salts.

To impart flame retardancy to the composition, flame retardants and j! I
A combustion aid may also be included. Examples of flame retardants include decabromo biphenyl ether, octabromo biphenyl ether, hexabromo biphenyl ether, and halogenated polycarbonate oligomers (for example, polycarbonate oligomers made from brominated bisphenol A).

These include halogen-containing compounds such as halogenated epoxy compounds and halogenated polystyrene oligomers (e.g., tribromostyrene oligomers); phosphorus compounds; and phosphorus-nitrogen compounds such as phosphonic acid amides. As an example.

Examples include antimony trioxide and zinc borate.

To improve the heat resistance of the composition, a hindered phenol compound and an antioxidant such as a sulfur compound or a heat stabilizer such as a phosphorus compound may be included.

Examples of hindered phenolic compounds include pentaerythrityl-tetrakis[3-(3°,5′-di-t-butyl-4″-hydroxydiphenyl)propionate]
, octadecyl-3-(3',5゜di-t-butyl-4
'-hydroxyphenyl)propionate, and 4,
There is 4°-butylidene-bis(2-t-butyl-5-methylphenol). Examples of sulfur compounds include 4.4
'-thio-bis(2-1-butyl-5-methylphenol), MARK An-23 (manufactured by Adeka Argus Chemical Co., Ltd.), and MARK An-412S (manufactured by Adeka Argus Chemical Co., Ltd.)
Manufactured by Argus Chemical Company). Examples of phosphorus compounds are phosphoric acid, trimethyl phosphate, and methyl diethyl phosphate.

Phosphate esters such as triethyl phosphate, triisopropyl phosphate, tributyl phosphate, triphenyl phosphate;
Phosphite esters such as trimethyl phosphite, triethyl phosphite, and triphenyl phosphite; phosphonic acid,
Phosphonic acids and derivatives thereof such as phenylphosphonic acid and phenyl phenylphosphonate; phosphinic acid.

Examples include phosphinic acids such as phenylphosphinic acid and dimethylphosphinic acid, and derivatives thereof.

Among these, particularly preferred are phosphate esters such as trimethyl phosphate and triphenyl ()phosphate. These phosphorus compounds can be used alone or in combination of two or more.

Additionally, various epoxy compounds may be included to improve the melt viscosity stability and hydrolysis resistance of the composition. As an epoxy compound.

For example, bisphenol A-type epoxy compounds obtained by reacting bisphenol 8 and epichlorohydrin; aliphatic glycidyl ethers obtained by reacting various glycols and glycerol with epichlorohydrin; novolak-type epoxy compounds obtained from novolac resins and epichlorohydrin; The resulting alicyclic compound type epoxy compounds are preferably used. Particularly preferred epoxy compounds include bisphenol A type epoxy compounds and diglycidyl ethers of low molecular weight polyethylene glycols, and diglycidyl esters of aromatic dicarboxylic acids.

Examples of additives other than the above include ultraviolet absorbers, colorants, lubricants, antistatic agents, blowing agents, fillers, reinforcing materials, and the like. When the above-mentioned fillers, reinforcing materials, etc. are added to the resin composition of the present invention, a silane coupling agent, a titanate coupling agent, etc. may be contained in order to improve the adhesion between these additives and the resin. You can leave it there.

The above polyester (A) and modified polyester (B).

A resin composition of the present invention is obtained by mixing polycarbonate and various additives as necessary. Known methods can be used to mix these components. For example, blend all ingredients at the same time. A method of mixing and homogenizing with a mixer such as a kneader or an extruder: Examples include a method of mixing a part of the ingredients in the above mixer, etc., and then mixing the remaining components to homogenize. . In the above method, instead of modified polyester (B).

Using unmodified polyester as a raw material, the above unsaturated dicarboxylic acid and organic peroxide are simultaneously charged, melted and
A grafting reaction is carried out during kneading.

It is also possible to produce modified polyesters (B).

Most first-class, a pre-triblended composition is further melt-kneaded in a heated extruder to homogenize it, and then extruded into wires 9 and then cut into desired lengths and granulated to form pellets. . Still another method is polyester (A
) at the time of preparation.

There is a method of adding and mixing the modified polyester (B), polycarbonate, and other components as necessary before the polycondensation reaction, after the polycondensation reaction, or during the polycondensation reaction.

A packaging material is prepared using the resin composition of the present invention by a conventional method, and the method is not particularly limited.

For example, the components of the composition described above are mixed, melted and kneaded, or pellets obtained by melting and kneading the components in advance are melted and molded by an appropriate method. For example, a film or sheet can be obtained by melting sufficiently dried pellets and extrusion molding. Alternatively, bottles are manufactured by injection molding. It is also possible to form a laminate by coating the above film or sheet onto a base material used as a protective layer or decorative layer. The above base material is polyethylene.

Polypropylene, polyethylene terephthalate.

There are synthetic resin films such as nylon and poval; metal foils such as aluminum foil; and paper. The above laminate is 1
For example, it can be formed by the following method: (1) Directly melt-extruding a resin composition onto a substrate.

Method for forming a resin layer; (2) A method in which a resin composition is previously formed into a film and then pasted onto a substrate using a known adhesive.

Among the packaging materials of the present invention, the above-mentioned films and sheets are usually colored one color and used as a packaging film or sheet, or processed into a bag or the like. The above-mentioned bottle is suitably used as a container for various beverages, liquid medicines, cosmetics, and the like.

The above laminate is suitable for uses such as so-called paper bags for milk, juice, and alcoholic beverages.

The composition of the present invention comprises a polyester (
^) Contains a modified polyester (B) graft-polymerized with an unsaturated dicarboxylic acid and a polycarbonate. In addition to the transparency and chemical resistance of conventional polyester/polycarbonate mixtures, this composition has better moldability, and the resulting molded product has excellent strength and toughness. Therefore, the packaging material obtained using this composition has such excellent properties.

For example, the bottles obtained using this composition.

It has excellent transparency, is not corroded by acids, alkalis, etc., and has excellent strength and toughness. Furthermore, molded objects (bottles, films, etc.) obtained using this composition
is extremely unlikely to adsorb or desorb odor components from the packaged items.

Therefore, the packaging material of the present invention adsorbs medicinal ingredients, aroma ingredients, other odor ingredients, etc. of the packaged article, and desorbs them very little.

It is possible to preserve the scent of various articles without letting them escape. Furthermore, since the composition itself has no odor,
The product can be stored without transferring odor to the packaged product. Therefore, it is suitably used as a packaging material for foods, medicines, cosmetics, etc.

(Example) An example of the present invention will be described below. In the Examples, all parts are by weight.

The polyesters prepared in the Examples and Comparative Examples below (
The compositions of A) and modified polyester (B) are shown in Table 1. In Table 1, the numerical value in the column for each polyester indicates mol%, and the blend ratio of polyester (A), modified polyester (B), and polycarbonate indicates weight ratio. R and V indicate reduced viscosity. TPA is terephthalic acid, IPA is isophthalic acid, BG is ethylene glycol, BD is butanediol, TMP is trimethylolpropane, MA is maleic anhydride, and CHD is 1,4-cyclohexanedimethanol.

The above reduced viscosity is a value measured at 30° C. in a phenol-tetrachloroethane mixed solvent (60/40 V/V).

Example 1 The components of polyester (A) shown in Table 1 were used, and after transesterification, polycondensation was performed at 260°C under high vacuum to obtain a polyester (A) having a reduced viscosity of 0.80.
I got ^). Next, polyester (unmodified) was prepared in the same manner as above using TPA, BG and CHD among the components of modified polyester (B) shown in Table 1. The reduced viscosity of this unmodified polyester was 0.8. A solution prepared by diluting 0.5 part of maleic anhydride and 0.2 part of dicumyl peroxide about 10 times with acetone was added to 100 parts of this polyester and mixed. The inner diameter of this mixture is 30m.
The mixture was placed in a twin-screw extruder (manufactured by Ikegai) and melted and kneaded at 200°C.

A modified polyester (B) was obtained by graft polymerization of maleic anhydride. The amount of grafted maleic anhydride added to the modified polyester (B) was 15 mol/10'g. The reduced viscosity of the obtained modified polyester (6) is 0.9
It was 0.

The above polyester (A) and modified polyester (B).

and polycarbonate (Nipiron S-2000,
Weight average molecular weight 2.5 x 10', Mitsubishi Gas Chemical @J)
were charged into a twin-screw extruder (manufactured by Ikegai ■) in the proportions shown in Table 1.

The mixture was melt-kneaded at 250°C and extruded through a nozzle to pelletize. The obtained chip was vacuum dried at 70° C. for 20 hours. The dried chips were placed in a film forming machine with an inner diameter of 40 mm (manufactured by Nippon Steel Corporation) and formed into a film with a thickness of 5 mm.
A film of 0 μm was obtained. Each physical property of the obtained film was evaluated by the following method.

(a) Film formability Regarding moldability, visual observation showed ◎ and ○.

Evaluation is made on a four-level scale of △ and ×.

(b) Tensile strength and tensile elongation Measured in accordance with JIS Z 1702.

(C) Transparency and haze value Using IIAZB MBTBR-3 manufactured by Toyo Seiki Co., Ltd., the amount of light transmitted through the film is measured, and the light transmittance is calculated. Based on this, transparency is evaluated and a haze value is calculated. The evaluation of transparency is as follows: ◎: Light transmittance is 90% or more; ○: Light transmittance is 80% or more and less than 90%; △: Light transmittance is 70% or more and less than 80%; ×: Light rays Transmittance is less than 70%.

(d) D-limonene adsorption amount D-U monene, which is an aroma component, is placed in a sample bottle. Put a film test piece (4 cm x 5 cm) into this bottle and
- Soak in U monene and leave at room temperature for one week. The weight of the film before immersion and the weight of the film after immersion are measured, and the difference between these weights is taken as the amount of 0-limonene adsorbed by the film. Separately, using a low-density polyethylene film of similar size, the adsorption amount of D-limonene is determined. The amount of 0-limonene adsorbed by the film of the present invention is calculated assuming that the amount of D-limonene adsorbed by polyethylene is 100.

(e) Peel adhesion strength A 100 μm thick film prepared according to the present invention was
Cut to size m x 10cm. Separately, thickness 25
Cut a μm polyester film (B-5000, manufactured by Toyobo ■) into the same size, overlap it on the above film, fold it in half, and cut one end of the film in the longitudinal direction to a width of 1
Heat seal over cm x length 5CI11. Heat sealing pressure 2 kg f/cm 2.150℃
Do this for 5 seconds. The T-peel adhesive strength of the obtained film is measured at 25° C. using a tensile tester (Tensilon RTM-100, manufactured by Toyo Baldwin ■). The tensile speed at this time is 300 mm/min.

Table 2 shows the test results of (a) to (e) above. Table 2 also includes the results of Examples 2 to 11 and Comparative Examples 1 to 9 described below.
Shown below.

Compositions of polyester (^) and modified polyester (B); polyester (^), modified polyester (B),
The procedure was the same as in Example 1, except that the blend ratio of polycarbonate and polycarbonate were changed as shown in Table 1.

Comparative Example 9 A polyethylene film was obtained by forming a film using PH-LD manufactured by Mitsui Nisseki ■. Except for using this.

This is the same as in Example 1.

(The following is a blank space) (Effects of the Invention) According to the present invention, a polyester resin composition having excellent moldability, mechanical properties, thermal adhesiveness, and transparency can be obtained. The packaging material using the polyester resin composition of the present invention has extremely low adsorption of medicinal ingredients, aroma components, etc. contained in the packaged article, and does not transfer the odor of the packaging material to the article. It is possible to preserve articles in good condition. therefore.

The packaging material of the present invention can be suitably used as a packaging material for packaging foods, medicines, cosmetics, and the like.

that's all

Claims (1)

[Scope of Claims] 1. A polyester resin composition containing polyester (A), modified polyester (B), and polycarbonate as main components, wherein the polyester (A) contains 40 to 100 mol% of terephthalic acid, terephthalic acid, and terephthalic acid. Aromatic dicarboxylic acids other than acids 0-60
mole %, and aliphatic or cycloaliphatic dicarboxylic acid 0-2
The modified polyester (B
) is a dicarboxylic acid component containing 40 to 100 mol% of terephthalic acid, 0 to 60 mol% of an aromatic dicarboxylic acid other than terephthalic acid, and 0 to 20 mol% of an aliphatic or alicyclic dicarboxylic acid, and 50 to 50 mol% of ethylene glycol. 90 mol%
, and 1,4-cyclohexanedimethanol 50-1
A polyester resin composition obtained by reacting an unsaturated dicarboxylic acid or its anhydride with a polyester obtained from a glycol component containing 0 mol %. 2. A packaging material comprising the polyester resin composition according to claim 1.