JP2001181411A - Propylene-based resin sheet for ptp packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polypropylene-based resin sheet for PTP packaging, controlling occurrence of curl in laminating in laminating the polypropylene- based resin sheet to an aluminum foil cover material. SOLUTION: This polypropylene-based resin sheet for PTP packaging is characterized in that the sheet comprises a polypropylene-based resin, has a first surface and a second surface in which an absorbance ration in the first surface (ratio of absorbance at wavenumber 998 cm-1 to an absorbance at wavenumber 974 cm-1) AH and an absorbance ratio in the second surface AL satisfy the formula AH>AL and a distance T1 between a point to provide the maximum value Amax of absorbance ratio in the thickness direction of the sheet and the first surface and a distance T2 between the point and the second surface satisfy the formula 0.7<=[T2/(T1+T2)]<=1, the value of (a) which is defined by the formula a=(Amax-AL)×(T1+T2)/T1 is >=0.1 and <=1.3 and the value of (Amax-AL) is >=0.1 and <=1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polypropylene resin sheet for PTP packaging.

[0002]

2. Description of the Related Art PTP (press-through pack) packaging
In the field of pharmaceutical packaging, it is widely used for packaging solid tablets such as tablets and capsules. PTP packaging is generally
Using a sheet made of hard vinyl chloride resin as the bottom material,
The bottom material is formed in a pocket shape, a solid agent is filled therein, and the package is sealed with a lid material made of aluminum foil and packaged. Hard vinyl chloride resin is mainly used because of its transparency,
This is because moldability, stiffness, cost, and the like are excellent. Pharmaceutical tablets and capsules may be degraded or deformed by moisture absorption. This has been dealt with by using sheets in which vinylidene chloride resin is composited by coating or the like, but these are disadvantageous in terms of cost. Further, there is an increasing tendency for chlorine-containing resins to be avoided due to problems in disposal. Therefore, a sheet made of a polypropylene-based resin containing no chlorine has been attracting attention because of its moisture-proof property, cost and ease of processing.
It has come to be used as a P packaging sheet. However, the conventional polypropylene resin sheet for PTP packaging has a large curl when bonded to an aluminum foil lid material as compared with a vinyl chloride resin sheet, and has problems in appearance and compatibility with automatic packaging lines. There is.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in a polypropylene resin sheet for PTP packaging, and suppresses the occurrence of curling during bonding with an aluminum foil lid material. To provide a polypropylene-based resin sheet for PTP packaging.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, by making the polypropylene resin sheet have a specific infrared absorbance distribution in the thickness direction, an aluminum foil is obtained. The present inventors have found that the occurrence of curl when pasting is effectively prevented. The present invention provides a sheet made of polypropylene resin, having a first surface and a second surface, (the ratio of the absorbance at a wave number 998 ^-1 to the absorbance at a wave number 974 cm ^-1) absorbance ratio at the first surface A _H And the absorbance ratio A _{L on} the second surface satisfies the following formula: A _H > A _L , and the maximum value of the absorbance ratio in the thickness direction of the sheet is A
the distance T ₁ of the from the first surface of the point giving the _max, the distance T ₂ of the second surface, the following formula _{0.7 ≦ [T 2 / (T} 1 + T 2)] satisfy the ≦ 1, the following equation a = (A _max −A _L ) × (T ₁ + T ₂ ) / T ₁ where the value of a is 0.1 or more and 1.3 or less;
Provided is a polypropylene-based resin sheet for PTP packaging, wherein the value of (A _max -A _L ) is 0.1 or more and 1 or less.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The polypropylene resin constituting the sheet of the present invention is not particularly limited, but a crystalline polypropylene resin is preferable. Examples include a polymer, a crystalline propylene-ethylene random copolymer, a crystalline propylene / α-olefin random copolymer, and a crystalline block copolymer of propylene with ethylene and / or α-olefin. Examples of the α-olefin include those having 4 to 10 carbon atoms such as butene-1, pentene-1, hexene-1, octene-1, and decene-1.
Α-olefin.

[0006] The polypropylene resin constituting the sheet of the present invention may contain, if necessary, various additives such as an antioxidant, an antifogging agent, an antistatic agent, a nucleating agent, an ultraviolet absorber, a pigment and a filler. May be contained. Further, an organic polymer other than the polypropylene-based resin may be blended within a range not to hinder the present invention.

[0007] The two surfaces of the sheet of the present invention are referred to as a first surface and a second surface, respectively. The first surface has an absorbance ratio A _H that is greater than the absorbance ratio A _L of the second surface. The term absorbance ratio as used herein refers to a wavenumber 974c
It means the ratio of the absorbance at wavenumber 998 cm ^{-1 to} the absorbance at m ^-1 . The sheet of the present invention, the maximum value of the absorbance ratio in the thickness direction of the sheet and the distance T ₁ of the from the first surface of the point giving the A _max, and the distance T ₂ of the second surface, the following equation 0.7 ≦ T ₁ / (T ₁ + T ₂ ) ≦ 1 is satisfied. Also, the equation a = (A _max -A _L ) × (T ₁ + T ₂ ) / T ₁
Is 0.1 or more and 1.3 or less, and the value of (A _max -A _L ) is 0.1 or more and 1 or less.
Preferably, the value of a is 0.2 or more and 1.0 or less,
The value of (A _max -A _L ) is 0.2 or more and 0.8 or less.

When the value of T ₁ / (T ₁ + T ₂ ) is less than 0.7, the effect of suppressing the occurrence of warp becomes extremely small,
Not preferred. Further, if the value of a is less than 0.1, the effect of suppressing the occurrence of warpage becomes extremely small, which is not preferable. If the value of a exceeds 1.3, the secondary workability becomes extremely poor and the production thereof becomes difficult. Not preferred.

Absorbance at wave number 998 cm ^-1 and wave number 9
The absorbance at 74 cm ^-1 correlates with the crystal state of the polypropylene resin, and the absorption peak at a wave number of 998 cm ^-1 originates from the polypropylene crystal part and has a wave number of 9
The absorption peak at 74 cm ^-1 is derived from the amorphous portion of polypropylene. For example, see “Polymer 1966, Vol.
15, No. 175, P881 ". Therefore, the wave number 998 cm for the absorbance at the wave number 974 cm ^-1
The crystallinity of the polypropylene-based resin increases as the value of the absorbance ratio at ^-1 increases. The absorbance is measured using an infrared spectrophotometer.

The sheet of the present invention may be composed of a single layer of a polypropylene resin, or may be composed of two or more layers of a polypropylene resin. The thickness of the sheet of the present invention is not particularly limited and can be arbitrarily selected, but is usually 100 to 1000 μm.

The sheet of the present invention can be manufactured by using a conventional sheet forming method such as a T-die forming method and a calendar forming method. When cooling and solidifying the film formed of the molten resin, it is preferable to set conditions such that the cooling rates of both surfaces of the film are different. For example, in a T-die molding method using an apparatus having an air chamber (or an air knife) and a cooling roll, the surface temperature of the cooling roll is set to 50 degrees.
℃ or lower and air chamber (or air knife)
The temperature of the air supplied to
It is preferable to increase the temperature by 0 to 100 ° C (more preferably 20 to 80 ° C). Further, in the T-die forming method using an apparatus including a cooling roll and a touch roll, the surface temperature of the cooling roll is set to 50 ° C. or less, and the surface temperature of the touch roll is set to 10 to 60 ° C. lower than the surface temperature of the cooling roll. (Preferably 20 to 50 ° C.). On the other hand, in calendering using an apparatus provided with a first roll and a second roll, the surface temperature difference between the first roll and the second roll is set to 10 to 60 ° C (preferably 20 to 50 ° C). preferable.

[0012]

EFFECT OF THE INVENTION The polypropylene resin sheet for PTP packaging of the present invention is excellent in adaptability to an automatic packaging line because it hardly generates curl at the time of lamination with an aluminum foil lid material.

[0013]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but these examples do not limit the present invention in any way.

(1) Measurement of Absorbance Ratio The sheet is cut in the MD direction to expose the cross section,
About the cross section of the “Specru” manufactured by PerkinElmer
m-2000 ATR microscope FT-IR AUTO IM
IR measurement was performed by the ATR method using an AGE system. This
In this case, the measurement visual field is 100 μ in the MD direction and 30 in the thickness direction.
μ, and the sheet cross section is divided every 30μ in the thickness direction.
Measured separately. Also, on both sides of the sheet,
IR measurement was performed using the above device. 16 scans
Times, measurement wave number range is 1400cm ^-1From 700cm^-1When
did. Based on this measurement result, a wave number of 974 cm^-1In
Number 998 cm for absorbance^-1Of absorbance at
The ratio was determined.

(2) Evaluation of curl Blister pack molding machine FBP-M2 manufactured by CKD Corporation
Using a molding temperature of 140 ° C., every 50 shots, the pocket shape has a bottom of 10 mmΦ, a top of 9 mmΦ, and a depth of 4.
A 1 mm, 1 shot, 10 pockets, 2 pocket-assisted air-pressed molds, heat-sealed with aluminum foil at 175 ° C without filling the contents, slittered at 130 ° C, and width A molded product punched out at 37 mm, length 94 mm, and a corner 5 mmR was placed on a flat surface, and the warped height of the molded product 5 minutes after punching was measured. 1
The heights of the four corners of each of the molded products were measured for zero molded products, and the average values were obtained and evaluated. For aluminum foil,
A 20 μm-thick hard aluminum foil coated with maleated polypropylene at a thickness of 5 μm was used. The curl height is preferably low, and as a guide, a curl height of 4.5 mm or less is appropriate.

[0016]

Example 1 Propylene homopolymer (Noblen W101C manufactured by Sumitomo Chemical Co., Ltd., melting point main peak temperature Tm = 161 ° C. by DSC measurement, MFR = 7.0 g / 10)
(Hereinafter referred to as “material 1”) and 100 parts by weight of the resin, a metal phosphate-based nucleating agent (trade name: ADK STAB NA-1)
1. A resin composition to which 0.3 parts by weight of Asahi Denka Kogyo Co., Ltd. was added was prepared. These were processed into two-layer, two-layer sheets using a co-extrusion T die-cast machine manufactured by CBC Tech Co., Ltd. equipped with an air chamber and a cooling roll.
Specifically, the extruding was performed in a two-layer configuration at an extrusion temperature of 240 ° C. so that the layer made of the material 1 was in contact with the cooling roll,
30 ° C by taking off with a cooling roll adjusted to
A sheet of 0μ was obtained. Air at 60 ° C. was supplied to the air chamber. The sheet thus formed was evaluated for curl. Table 1 shows the results.

[0017]

[Table 1]

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Koichi Yanase 5-1 Anesaki Kaigan, Ichihara-shi, Chiba Sumitomo Chemical Co., Ltd. (72) Inventor Yuji Kawachi 2-5-2-8 Higashishinagawa, Shinagawa-ku, Tokyo Sumitomo Inside Bakelite Co., Ltd. (72) Inventor Yoshifumi Furukawa 2-5-2-8 Higashishinagawa, Shinagawa-ku, Tokyo Sumitomo Bakelite Co., Ltd. (72) Masaki Takeda 2-5-2-8 Higashishinagawa, Shinagawa-ku, Tokyo Sumitomo Bakelite (72) Inventor Yasuo Shimobe 2-5-8 Higashishinagawa, Shinagawa-ku, Tokyo Sumitomo Bakelite Co., Ltd. F-term (reference) 4F071 AA15X AA20 AA20X AA21X AA75 AA76 AH04 BB04 BB06 BC01 4F100 AK07A AK07B BA02 GB15 JN30J 4J002 BB121 BB141 BB151 BP021 FD010 FD050 FD070 FD090 FD100 FD200 GG02

Claims (1)

[Claims] 1. A sheet made of polypropylene resin, having a first surface and a second surface, the absorbance ratio at the first surface (the ratio of the absorbance at a wave number 998 ^-1 to the absorbance at a wave number 974 cm ^-1) A _H and the absorbance ratio A _{L on} the second surface satisfy the following formula: A _H > A _L , and satisfy the maximum value of the absorbance ratio in the thickness direction of the sheet, Ama.
The distance T ₁ from the first surface to the point giving x and the distance T ₂ from the second surface satisfy the following equation: 0.7 ≦ [T ₂ / (T ₁ + T ₂ )] ≦ 1 a = (A _max −A _L ) × (T ₁ + T ₂ ) / T ₁ where the value of a is 0.1 or more and 1.3 or less;
A polypropylene resin sheet for PTP packaging, wherein the value of (A _max -A _L ) is 0.1 or more and 1 or less.