JP2601737B2 - Transparent polyester resin composition and molding sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester resin having good transparency and a molding sheet obtained by using the same. More specifically, the present invention provides a resin composition having excellent dimensional stability and releasability, which is suitable for producing a molding sheet such as a food container or a blister pack.

[0002]

2. Description of the Related Art In recent years, a transparent plastic sheet has been thermoformed into the same shape as the content product in order to emphasize the display effect of the product and to emphasize the display effect of the product. Blister packs and the like that have been thermally bonded to an applied mount, aluminum foil, and the like have been developed and used. In addition, many of the medicines contained in tablets and capsules are marketed in a container made of glass, plastic, or the like, but in recent years, so-called blisters, in which individual tablets and capsules are individually packaged separately. Forms are increasing. For this reason, resin sheets and films having excellent transparency are widely used as transparent sheets for molding of blister packs, food containers and the like. Hard vinyl chloride excellent in transparency has been actively used for blister sheets.

[0003] However, molded articles using a vinyl chloride resin have a serious problem in disposal after use. For example, in the case of a cured vinyl chloride resin, it is difficult to recycle the resin. When incineration, which is one method of disposal, is performed, toxic gas is generated, and vinyl chloride resin is a troublesome resin to handle. For this reason, in recent years, the use of recyclable resins instead of vinyl chloride resins has been studied. In recent years, attempts have been made to use low-density polyethylene resins and amorphous linear polyester resins as resins suitable for molding blister packs and food containers having excellent transparency. However, low-density polyethylene resin has poor transparency,
It is unsuitable for achieving the above purpose. Further, the amorphous linear polyester resin is excellent in transparency, but has a drawback that the coefficient of friction is large.

For this reason, trays and blisters obtained by vacuum forming a sheet extruded by the T-die method using an amorphous linear polyester resin as a raw material (in accordance with the shape of an article,
When transparent plastic sheet moldings made by vacuum molding or pressure molding are stacked and left to stand, it is difficult to peel off the moldings one by one (hereinafter referred to as renestability). There is. Therefore, in order to solve the above-mentioned drawbacks, a silicone oil or a fluorinated surfactant is applied to the surface of a molded product using an amorphous linear polyester resin,
Attempts have been made to improve the slip property and the renesting property, but the operation is complicated and not preferable. or,
Attempts have been made to improve the renesting property by adding an inorganic substance. However, in order to exert the effect, it is necessary to mix a large amount of an inorganic substance, which is not preferable because the transparency of the obtained sheet is lowered.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present inventors have developed an amorphous linear polyester resin having excellent transparency to form food containers and blister packs having excellent transparency and renestability. In order to obtain a molding sheet capable of
The inventor of the present invention has made intensive studies on the development of a transparent polyester resin composition.

[0006]

That is, the present invention relates to (A) 100 parts by weight of an amorphous linear polyester resin,
(B) 0.1 to 1.0 parts by weight of talc having a particle size of 0.5 to 10 μm and (C) 0.05 to glyceride of hydroxy fatty acid
A transparent polyester resin composition containing 1.0 part by weight. The molding sheet of the present invention obtained with the transparent polyester resin composition having this composition has excellent transparency and renestability. The amorphous linear polyester resin (A) used in the present invention has a melting point of 200 to 200.
At 250 ° C., are those inherent viscosity of 0.60 to 1.00, for example, as a product, Kodak Chemical Company PE
T-9921, 9922, 6736, Kuraray KS
-760R and the like.

[0007] (B) Talc may be a commercially available one, the main component being hydrous magnesium silicate, white or pale yellow powder having a particle size of 0.1 to 10 µm. If the particle size is smaller than 0.1 μm, the dispersibility in the component (A) and the slipperiness of the obtained molded product are undesirably reduced. On the other hand, if it is larger than 10 μm, the transparency of the obtained molded product is undesirably reduced. The component (B) has a refractive index close to that of the component (A) of 1.57 to 1.60. Therefore, even if the component (B) is blended in a larger amount than other inorganic substances, the decrease in transparency is small. If it is, the transparency of the molded article is not reduced.

The (C) hydroxy fatty acid glyceride is a mono-, di- or tri-glyceride hydroxy compound of a fatty acid having 8 to 22 carbon atoms. For example, it is included in those obtained by hydrogenating (hydrogenating) natural castor oil (CASTOR OIL). Hydrogen linked to the twelfth carbon, starting from the carbon of the carbonyl, is substituted with a hydroxyl group (OH), and the glyceride is preferably a tri-type. The most preferred hydroxy fatty acid glyceride is hydroxystearic acid triglyceride.

In the present invention, based on 100 parts by weight of the component (A),
The component (B) is used in an amount of 0.1 to 1.0 part by weight. If less than 0.1 part by weight, the lubricity of the resin composition is reduced, and when a sheet for molding is manufactured, for example, blisters obtained by vacuum-pressure forming a sheet extruded by a T-die method are left to stand. , It is not possible to take out one by one later, that is, there is a decrease in so-called renestability (slipperiness),
On the other hand, if it is more than 1.0 part by weight, transparency and moldability are undesirably reduced. The component (C) is added in an amount of 0.05 to 1.0 part by weight. If the amount is less than 0.05 part by weight, when a molding sheet is produced, the renesting property is undesirably reduced, and if it is more than 1.0 part by weight, transparency and moldability are undesirably reduced.
In particular, in the present invention, when the ratio of the component (C) to the component (B) is 1.0: 1.0 to 1.0: 0.3, the slip property (renest property) is improved.
And the synergistic effect on transparency is best exhibited, and the composition of the present invention exhibits excellent effects by using a small amount of additives [(B) + (C)].

In the conventional method of simply adding a lubricant to the resin for improving the renesting property, the renesting property is improved, but the disadvantage that the transparency is always lowered is also caused. However, in the above-mentioned composition of the present invention, even when an amorphous linear polyester resin is used, the transparency is not reduced, and the production of the transparent polyester resin composition of the present invention, which has improved renestability, The production of the molding sheet may be performed by a usual method. Incidentally, the production of the molding sheet of the present invention,
The component (A), the component (B) and the component (C) may be blended at the concentration of the sheet for molding directly after the master batch is produced in advance. In particular, (A) 100 parts by weight of the amorphous linear polyester resin, (B) particle size 0.5
When a transparent polyester resin composition is manufactured by diluting 1.0 to 40.0 parts by weight of talc of 1.0 μm to 10 μm and (C) 1.0 to 20.0 parts by weight of hydroxy fatty acid glyceride, the lubricant master batch for transparent polyester resin is diluted. It is preferable since the dispersibility of the components (B) and (C) is improved, and the excellent molding sheet of the present invention can be easily obtained.

[0011]

【Example】

Example 1 (A) 90 parts by weight of an amorphous linear polyester resin (manufactured by Kodak Chemical: PET9921); (B) talc having an average particle size of 5 μm (manufactured by Asada Flour Milling Co .: J
A46R) 6 parts by weight, (C) 4 parts by weight of hydroxy fatty acid glyceride (Kawaken Fine Chemical Co., Ltd. product: K-3 wax) were charged, mixed and stirred for 1 minute, and then melt-kneaded with a twin-screw extruder to pelletize. And obtain a masterbatch. (A) = 100, (B) = 0.3, (C) = obtained by mixing 5 parts of the above-mentioned pellets and 95 parts of (A) an amorphous linear polyester resin (manufactured by Kodak Chemical: PET9921). The transparent polyester resin composition of 0.2 is formed into a molding sheet having a thickness of 0.5 mm at a temperature of 250 to 280 ° C. using a 30 mm T die extruder.

Using the above-mentioned molding sheet, a measurement test was carried out for renestability and transparency by the following method, and the results were obtained.

[Table 1] Shown in Hereinafter, the same measurement was performed for Examples 1 to 3 and Comparative Examples 1 to 4, and the results are shown. (A) Measurement of renestability A 0.5 mm thick molding sheet was blister molded using a vacuum pressure air molding machine, 30 of these were stacked, left at room temperature for 48 hours, and then the blisters were peeled off one by one. About ease,
A manual attempt is made and the result is determined according to the following criteria. Judgment criteria, ◎: Easy to remove one by one ○: Occasionally take off △: Sometimes take out one by one ×: Cannot take out one by one at all (b) Measurement of transparency 0.5mm thick molding sheet Using a haze meter as a reference, a transparent sheet (JIS- K-6714), and judge according to the following criteria. Judgment criteria, ◎: Almost equivalent to Naziral △: Inferior to Naziural ×: Inferior to Naziural

[0013]

Example 2 90 parts by weight of (A) an amorphous linear polyester resin (manufactured by Kuraray Co., Ltd .: KS-760R) in a stirring mixer (B)
6 parts by weight of talc (product made by Asada Flour Milling Co., Ltd .: JA46R) with an average particle size of 5μ and (C) 4 parts by weight of hydroxy fatty acid glyceride (product made by Kawaken Fine Chemical Co., Ltd .: K-3 wax)
After mixing and stirring for 1 minute, the mixture is melt-kneaded with a twin-screw extruder and pelletized to obtain a master batch. Above pellet 5
And a transparent polyester resin composition having the same blending ratio as in Example 1 obtained by mixing 95 parts of (A) an amorphous linear polyester resin (manufactured by Kuraray: KS-760R) with a 30 mm T die extruder. To form a 0.5 mm thick sheet for molding at a temperature of 250 to 280 ° C.

[0014]

Example 3 100 parts by weight of (A) an amorphous linear polyester resin (manufactured by Kodak Chemical Co., Ltd .: PET9921), and (B) talc having an average particle diameter of 5 μm (manufactured by Asada Flour Milling Co .: J
A46R) 0.2 part by weight and (C) 0.5 part by weight of a hydroxy fatty acid glyceride (manufactured by Riken Vitamin Co., Ltd .: Riquemar TG-12) are charged, mixed and stirred for 1 minute, and then melt-kneaded with a twin-screw extruder (A). ) = 100, (B) = 0.2,
(C) = a transparent polyester resin composition consisting of 0.5
Using a 0 mm T die extruder at a temperature of 250 to 280 ° C and a thickness of 0.5 mm
Create a sheet for molding.

[0015]

Comparative Example 1 89 parts by weight of (A) an amorphous linear polyester resin (manufactured by Kuraray Co., Ltd .: KS-760R) in a stirring mixer (B)
1 part by weight of talc (product made by Asada Flour Milling Co., Ltd .: JA46R) having an average particle size of 5μ, and (C) 10 parts by weight of hydroxy fatty acid glyceride (product made by Kawaken Fine Chemical Co., Ltd .: K-3 wax) are mixed and mixed for 1 minute. After that, the mixture is melt-kneaded by a twin-screw extruder and pelletized to obtain a master batch. A ratio obtained by mixing 5 parts of the above pellets and 95 parts of (A) an amorphous linear polyester resin (product of Kuraray Co., Ltd .: KS-760R) is (A) = 100, (B) = 0.05, ( C) Using a 30 mm T die extruder, a polyester resin composition having a composition of 0.5
A molded sheet having a thickness of 0.5 mm is prepared at 250 to 280 ° C.

[0016]

Comparative Example 2 (A) 89.8 parts by weight of an amorphous polyester resin (manufactured by Kodak Chemical Co., Ltd .: PET9921), (B) Talc having an average particle size of 5 μm (manufactured by Asada Flour Milling Co .: J
A46R) 10 parts by weight and (C) 0.2 part by weight of a hydroxy fatty acid glyceride (K-3, manufactured by Kawaken Fine Chemicals Co., Ltd.) were mixed, mixed and stirred for 1 minute, and then melt-kneaded with a twin-screw extruder to pelletize. And obtain a masterbatch. A ratio obtained by mixing 5 parts of the above pellets and 95 parts of (A) an amorphous polyester resin (manufactured by Kodak Chemical Co., Ltd .: PET9921) is as follows: (A) = 100, (B) = 0.5, (C) =
Using a 30 mm T-die extruder, a 0.5 mm thick molded sheet is prepared from the 0.01 polyester resin composition using a 30 mm T die extruder.

[0017]

Comparative Example 3 100 parts by weight of (A) an amorphous polyester resin (manufactured by Kodak Chemical Co., Ltd .: PET9921)
(B) Talc with an average particle size of 5μ (product made by Asada Flour Milling Co .: JA46
R) 0.5 parts by weight and (C) 2.0 parts by weight of hydroxy fatty acid glyceride (K-3 wax manufactured by Kawaken Fine Chemical Co., Ltd.) are charged, mixed and stirred for 1 minute, and then melt-kneaded by a twin-screw extruder. The ratio is (A) = 100, (B) = 0.5,
(C) = 30 m
A molded sheet having a thickness of 0.5 mm is prepared at a temperature of 250 to 280 ° C. using an mT die extruder.

[0018]

Comparative Example 4 100 parts by weight of (A) an amorphous polyester resin (manufactured by Kodak Chemical Co., Ltd .: PET9921) was added to a stirring mixer.
(B) Talc with an average particle size of 5μ (product made by Asada Flour Milling Co .: JA46
R) 2.0 parts by weight and (C) 0.5 part by weight of a hydroxy fatty acid glyceride (K-3 wax manufactured by Kawaken Fine Chemicals Co., Ltd.) were mixed, mixed and stirred for 1 minute, and then melt-kneaded with a twin-screw extruder. (A) = 100, (B) = 2.0,
(C) = 30 mm polyester resin composition
Using a T-die extruder, a molded sheet having a thickness of 0.5 mm is prepared at a temperature of 250 to 280 ° C.

[0019]

The resin composition of the present invention is obtained by blending a specific amount of (B) talc and (C) a hydroxyfatty acid glyceride with (A) an amorphous linear polyester resin to obtain a blister pack, PTP or tray. It exhibits excellent effects in both transparency and renesting properties required for a sheet used for such purposes. That is, even if the trays obtained by molding using the molding sheet of the present invention are stacked and left for a long period of time, they are easily peeled off one by one and have excellent renesting properties, and are excellent in workability with easy handling. The transparency is not inferior to that of a sheet using an amorphous linear polyester resin containing no additive, and the contents can be seen well and the display effect of the product is greatly exhibited. Moreover, the amorphous linear polyester resin used in the present invention is:
It is easier to handle after use than conventional vinyl chloride resin. That is, when used in a blister pack, PTP, tray, or the like, it is a thermoplastic resin, and is used in a transparent state, so that it is easy to collect and recycle the resin. Its uses include miscellaneous goods, toys, stationery, electrical products, machine tools, cosmetics, medical instruments,
It can be used for packaging pharmaceutical tablets and the like.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C08K 5/10 KJV C08K 5/10 KJV // B29K 67:00 C08L 67:02

Claims (3)

(57) [Claims] (A) Amorphous linear polyester resin 100
(B) 0.1 to 1.
0 parts by weight and (C) hydroxy fatty acid glyceride 0.05
A transparent polyester resin composition, characterized in that the composition comprises from 1.0 to 1.0 parts by weight. 2. (A) Amorphous linear polyester resin 100
(B) 0.1 to 1.
0 parts by weight and (C) hydroxy fatty acid glyceride 0.05
A sheet for molding formed by mixing and using up to 1.0 part by weight. 3. (A) Amorphous linear polyester resin 100
(B) talc with a particle size of 0.5 to 10 μm
0.0 parts by weight and (C) hydroxy fatty acid glyceride 1.0
A lubricant masterbatch for a transparent polyester resin, characterized by containing up to 20.0 parts by weight.