JPH06219433A - Bottle mouthpiece forming piece, saturated polyester bottle containing the piece, and method for producing the same - Google Patents

Abstract

PURPOSE:To improve the adhesion of saturated polyester forming a mouthpiece by employing therefor a saturated polyester with the crystallizability determined by the density method in a specific range and the intrinsic viscosity in a specific range. CONSTITUTION:A bottle 1 of saturated polyester is composed of a mouthpiece 2 in which a support ring 4 and a screw thread 6 are included and a body part 3 which includes the shoulder 7, rising part 8 at the bottom, and bottom 9. The mouthpiece 2 is formed of two layers of saturated polyester, one layer being an outer circular part which includes the thread 6 and support ring 4 and the other layer being an inner circular part. The two layers laid one over another consist of one of saturated polyester with the crystallizability determined by the density method in a range of 30-65% and the intrinsic viscosity in a range of 0.55-0.85dl/g and one of saturated polyester with the crystallizability determined by the density method under 10%. This constitution enables obtaining a mouthpiece 2 of bottle satisfactory in heat resistance, dimensional stability, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottle mouthpiece forming piece, a saturated polyester bottle containing the piece, and a method for producing the same, and more particularly to a bottle mouthpiece excellent in heat resistance, dimensional stability and mechanical strength. Saturated polyester that has a mouthpiece that is excellent in heat resistance, dimensional stability, and mechanical strength, as well as a piece for forming a bottle mouthpiece that has excellent adhesiveness with saturated polyester that can form a mouthpiece The present invention relates to a bottle and a manufacturing method thereof.

[0002]

BACKGROUND OF THE INVENTION In recent years, various plastics have been used as materials for soft drinks such as juice and sports drinks, and bottles for carbonated drinks such as cola. Among them, saturated polyester such as polyethylene terephthalate (PET) is often used as a material for bottles because it is excellent in transparency, gas barrier property, heat resistance and mechanical strength.

By the way, juice or the like is usually hot-filled, and therefore it is required to mold a bottle with a heat-resistant resin that can withstand hot filling. Saturated polyester bottles such as PET bottles are usually composed of a spout and a body, and the body is stretch-molded and molecularly oriented. Therefore, it has excellent heat resistance and mechanical strength. ing. On the other hand, since the plug portion is hardly stretched, it has poor heat resistance and has a problem of being deformed at the time of high temperature filling.

In order to solve such a problem, for example, JP-A-59-33101 discloses that the neck of a saturated polyester bottle is crystallized by heat treatment. However, this method has a problem in that the thickness of the neck portion of the bottle is large, which causes variations in crystallinity and lacks in dimensional stability.

Further, Japanese Patent Application Laid-Open No. 2-208924 describes a method of obtaining a mouth portion having high heat resistance by multi-layer molding of saturated polyester and polycarbonate which is a resin having a high glass transition point. However, in this method, it is impossible to collect and reuse the bottle because the adhesion between the resins is insufficient or different resins are present.

[0006]

It is an object of the present invention to solve the above problems in the prior art, and it is possible to form a bottle cap portion which is excellent in heat resistance, dimensional stability and mechanical strength and which has a cap. Saturated polyester having a mouthpiece portion excellent in heat resistance, dimensional stability, and mechanical strength, as well as providing a piece for forming a bottle mouthpiece portion having excellent adhesiveness with saturated polyester forming a portion It is an object to provide a bottle manufacturing method and a manufacturing method thereof.

[0007]

SUMMARY OF THE INVENTION The bottle mouthpiece forming piece according to the present invention has a crystallinity of 30 to 65% as measured by a density method and an intrinsic viscosity of 0.55 to 0.85 dl / g. A range of saturated polyester is formed, and after forming the bottle cap, a part of the bottle cap is formed.

The saturated polyester bottle according to the present invention is a saturated polyester bottle having a mouth part and a body part, wherein the mouth part has a crystallinity of 30 to 65% as measured by the density method (a). Yes, with an intrinsic viscosity of 0.55
Saturated polyester in the range of 0.85 dl / g,
(B) It is characterized by comprising at least two layers in which a saturated polyester having a crystallinity measured by a density method of 10% or less is laminated, and the body portion is composed of stretched saturated polyester.

In the method for producing a saturated polyester bottle according to the present invention, the saturated polyester is injection-molded, the crystallinity measured by the density method is in the range of 30 to 65%, and the intrinsic viscosity is 0.55. A piece for forming a bottle plug portion which is in the range of 0.85 dl / g is molded, and the temperature (T) of the obtained piece for forming a bottle plug portion is kept so that it is in the temperature range represented by the following formula, Tg−65 ≦ T (° C.) ≦ Tg + 10 (where Tg is the glass transition point of the polyester forming the bottle mouth plug forming piece, T is the temperature of the bottle mouth plug forming piece), and then the bottle mouth Saturated polyester is injected into the mold in which the plug portion forming piece is inserted, and the preform plug portion is at least the bottle mouth plug portion forming piece and the injected saturated polyester. So as to form a layer, to form a preform body portion by injection molding, saturated polyester, molding the preform, it is characterized by stretch blow molding the preform obtained.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The bottle mouthpiece forming piece, the saturated polyester bottle containing the piece and the method for producing the same according to the present invention will be described below.

FIG. 1 shows a schematic cross-sectional view of a saturated polyester bottle according to the present invention, and FIG. 2 shows a schematic cross-sectional view of a spout of a saturated polyester bottle according to the present invention. In each figure, the same parts are designated by the same reference numerals.

[Bottle Mouth Portion Forming Piece] First, the bottle mouth plug part forming piece according to the present invention will be described. The bottle mouthpiece forming piece according to the present invention is formed from a piece-forming saturated polyester as described below, and has a crystallinity of 30 to 65%, preferably 35 to 65% as measured by a density method.
It is desirable that the range is 60%, and the intrinsic viscosity is 0.5
5 to 0.85 dl / g, preferably 0.60 to 0.82 dl
It is preferably in the range of / g.

The crystallinity of the bottle mouthpiece forming piece is 3
When it is less than 0%, the buckling strength of the bottle is insufficient and the heat resistance is poor, so that the dimensional change of the bottle mouthpiece forming piece is large when high temperature filling is performed, and the content may leak after capping.

The crystallinity of the bottle mouthpiece forming piece is 6
If it exceeds 5%, the adhesion with the saturated polyester forming the plug portion may be insufficient, and the plug portion may be cracked or chipped when capping or dropping the bottle. In addition, if the intrinsic viscosity of the bottle mouthpiece forming piece is less than 0.55 dl / g, the buckling strength and drop impact strength may be insufficient, and if it exceeds 0.85 dl / g, the flow during injection molding may be poor. The dimensional accuracy may be inadequate due to the lack of flexibility.

Such a bottle mouthpiece forming piece is
It is usually used as a part of the bottle mouth plug part and has a cylindrical shape or a cylindrical shape having a flange-shaped protrusion. As shown in FIG. 2, such a piece is integrally formed with the bottle cap portion as an outer peripheral portion, an inner peripheral portion or an intermediate layer of the cap portion.

To produce the bottle mouthpiece forming piece according to the present invention, a piece-forming saturated polyester as described below is heated in the mold at the same time as the injection or after the formation, and the crystallization is measured by the density method. The degree is 30 to 65%, and the intrinsic viscosity is 0.55 to 0.85 dl / g. The heating temperature of the bottle mouthpiece forming piece is 140 to 200 ° C.,
It is preferably in the range of 160 to 190 ° C., and heating can be performed inside or outside the mold. The heating of the bottle mouthpiece forming piece outside the mold can be performed by irradiating infrared rays or electromagnetic waves.

The bottle mouthpiece forming piece thus obtained is preferably subjected to the next preform molding step while keeping the temperature within the temperature range represented by the following formula. Tg−65 ≦ T (° C.) ≦ Tg + 10 (where Tg is the glass transition point of the saturated polyester forming the bottle mouth plug forming piece, and T is the temperature of the bottle mouth plug forming piece) As the piece forming saturated polyester used for forming the bottle mouth portion forming piece according to, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and copolymerized polyethylene terephthalate, that is, isophthalic acid, 2,6-naphthalenedicarboxylic acid , Adipic acid, diethylene glycol, tetramethylene glycol, neopentyl glycol, cyclohexane dimethanol, and the like, copolymerized polyethylene terephthalate.

Two or more kinds of these saturated polyesters may be blended and used. When two or more kinds of saturated polyesters are blended and used, it is preferable to combine polyethylene terephthalate and polybutylene terephthalate or polyethylene terephthalate and polyethylene naphthalate.

In the present invention, the following polyethylene terephthalate is preferably used as the saturated polyester for forming pieces. Polyethylene terephthalate, which is preferably used as the piece-forming saturated polyester in the present invention, is formed from a dicarboxylic acid constituent unit containing a terephthalic acid constituent unit and a dihydroxy constituent unit containing an ethylene glycol constituent unit.

This polyethylene terephthalate contains 20
Up to mol% of dicarboxylic acids other than terephthalic acid and ethylene glycol and / or other dihydroxy compounds may be copolymerized. Specific examples of dicarboxylic acids used for copolymerization other than terephthalic acid include:
Aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid; aliphatic dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid, decanedicarboxylic acid; cyclohexanedicarboxylic acid, cyclo Examples thereof include alicyclic dicarboxylic acids such as propane dicarboxylic acid and hexahydroterephthalic acid.

As dihydroxy compounds used for copolymerization other than ethylene glycol, specifically, aliphatic glycols such as trimethylene glycol, propylene glycol, tetramethylene glycol, neopentyl glycol, hexamethylene glycol and dodecamethylene glycol; cyclohexane Alicyclic glycols such as dimethanol; bisphenols; hydroquinone, 2,2-
Aromatic diols such as bis (4-β-hydroxyethoxyphenyl) propane; 1,3-propanediol, 1,4-butanediol and the like.

The polyethylene terephthalate preferably used in the present invention is derived from a polyfunctional compound such as trimesic acid, trimethylolethane, trimethylolpropane, trimethylolmethane, pentaerythritol, trimellitic acid and pyromellitic acid. The unit may be contained in a small amount, for example, 2 mol% or less.

Further, the polyethylene terephthalate preferably used in the present invention contains a small amount of structural units derived from a monofunctional compound such as benzoylbenzoic acid, diphenylsulfone monocarboxylic acid, stearic acid, methoxypolyethylene glycol and phenoxypolyethylene glycol in a small amount, for example, 2 mol%. It may be contained in the following amounts.

Such polyethylene terephthalate forms a substantially linear polyester by forming ethylene terephthalate component units alone or by randomly arranging the ethylene terephthalate component units and the dioxyethylene terephthalate component units to form an ester bond. is doing. The fact that the polyethylene terephthalate is substantially linear is confirmed by the fact that the polyethylene terephthalate is dissolved in o-chlorophenol.

The saturated polyester for forming pieces used in the present invention includes various kinds of crosslinking agents, heat resistance stabilizers, weather resistance stabilizers, antistatic agents, lubricants, release agents, inorganic fillers, pigment dispersants, pigments or dyes. The compounding agent may be contained in the range which does not impair the object of the present invention.

The bottle mouthpiece forming piece according to the present invention has a crystallinity of 30 to 65% as measured by a density method and an intrinsic viscosity of 0.55 to 0.85 dl / g. Since it is formed from a certain saturated polyester, it has excellent heat resistance and mechanical strength. By using such a bottle mouthpiece forming piece as a part of the bottle mouthpiece, it is possible to obtain a bottle mouthpiece having excellent heat resistance, mechanical strength and dimensional accuracy. The forming piece has excellent adhesiveness with the saturated polyester forming the plug portion.

The intrinsic viscosity of the saturated polyester used in the present invention is measured by the following method. That is, saturated polyester is added to o-chlorophenol at 1 g /
Dissolve at a concentration of 100 ml, measure the solution viscosity using an Ubbelohde-type capillary viscometer at 25 ° C, then gradually add o-chlorophenol to measure the solution viscosity on the low concentration side, and measure 0% concentration. Is extrapolated to obtain the intrinsic viscosity [η].

The glass transition point (Tg) of the saturated polyester used in the present invention is measured by the following method.
That is, using a Perkin Elmer DSC-7 type differential scanning calorimeter, under a pressure of about 5 mmHg at about 140 ° C.,
Approximately 10 mg of this sample was collected from the center of the saturated polyester chip or its molded product dried for 5 hours or more.
The thin flakes are sealed in a nitrogen atmosphere plate in a liquid aluminum pan. Then, the flakes are first rapidly heated to room temperature, melted and held at 290 ° C. for 10 minutes, and then rapidly cooled to room temperature. Next, the Tg is read from the endothermic peak as shown in FIG. 3 which is detected when the temperature of this sample is raised at a temperature raising rate of 10 ° / min.

The density of the saturated polyester used in the present invention is measured by the following method. That is, a density gradient tube is prepared from carbon tetrachloride and n-heptane in a constant temperature room at 25 ° C., a sample is placed in the density gradient tube and left standing for 3 hours or more, and then the scale of the density gradient tube is read.

The crystallinity of the saturated polyester used in the present invention is calculated by the following formula. Xc = dc (d-da) / d (dc-da) where xc: Crystallinity (%) d: Density of the sample da: density of amorphous phase (1.335g / cm ³⁾ dc: fully crystalline phase Density (1.455 g / cm ³ ) [Saturated polyester bottle] Next, the saturated polyester bottle according to the present invention will be specifically described.

Saturated polyester bottle 1 according to the present invention
As shown in FIG. 1, it comprises a support ring 4, a spigot portion 2 including a thread portion 6, an upper shoulder portion 7, a lower shoulder portion 8, and a body portion 3 including a bottom portion 9.

The plug portion 2 has a crystallinity measured by a density method in the range of 30 to 65% and an intrinsic viscosity of 0.55.
A layer made of saturated polyester (a) having a range of 0.85 dl / g and a layer made of saturated polyester (b) having a crystallinity of 10% or less measured by a density method were laminated in the thickness direction. It consists of at least two layers. The layer composed of the saturated polyester (a) is formed from the above-mentioned bottle mouth plug forming piece, and the layer composed of the saturated polyester (b) is formed from the bottle forming saturated polyester described later.

As shown in FIG. 2 (A), the spout part 2 is composed of saturated polyester (a) on the outer peripheral part including the thread portion 6 and the support ring 4, and saturated polyester on the inner peripheral part. It may be formed from two layers of (b), and as shown in FIG. 2 (B), the outer peripheral portion including the threaded portion 6 is made of saturated polyester (a), and the inner peripheral portion and the support ring 4 are It may be formed of two layers of the saturated polyester (b), and as shown in FIG. 2 (C), the outer peripheral portion including the thread portion 6 and the support ring 4 is made of the saturated polyester (b), The peripheral portion may be formed of two layers of saturated polyester (a).
As shown in (D), the outer peripheral portion including the screw thread portion 6 and the support ring 4 is made of saturated polyester (b), the intermediate layer is made of saturated polyester (a), and the inner peripheral portion is made of saturated polyester (b). It may be formed of three layers. In addition, as shown in FIG. 2 (E), the support ring 4
In the upper part, the outer peripheral portion including the threaded portion 6 is made of saturated polyester (a) and the inner peripheral portion is made of saturated polyester (b).
The support ring 4 may be formed of two layers including a saturated polyester (a) on the upper surface and a saturated polyester (b) on the lower surface. Further, as shown in FIG. 2 (F), the outer peripheral portion excluding the support ring 4 is made of saturated polyester (b), and the inner peripheral portion is made of two layers made of saturated polyester (a),
The support ring 4 may be formed of three layers in which the upper surface portion and the lower surface portion are made of saturated polyester (b), and the inner diameter side intermediate layer and the outer diameter side intermediate layer are made of saturated polyester (a). As shown in G), above the support ring 4, the outer peripheral portion including the threaded portion 6 is made of saturated polyester (b), the intermediate layer is made of saturated polyester (a), and the inner peripheral portion is made of saturated polyester (b). ), The support ring 4 is made of the upper surface and the lower surface of the saturated polyester (b), and may be formed of the intermediate layer saturated polyester (a).

The saturated polyester (a) and the saturated polyester (b) forming the plug portion 2 may be the same or different, but it is preferable that they are the same type of saturated polyester.

Such a plug part can be formed by injecting a saturated polyester for forming a bottle, which will be described later, into a mold into which the above-mentioned piece for forming a bottle plug part is inserted.

The body 3 is made of uniaxially stretched or biaxially stretched, preferably biaxially stretched saturated polyester, and may be heat set during molding. The intrinsic viscosity of such a body is preferably 0.50 to 1.5 dl / g, preferably 0.65 to 1.20 dl / g,
It is desirable that the crystallinity is 25% or more, preferably 30% or more.

As the bottle-forming saturated polyester for forming the mouth plug portion (excluding the bottle mouth portion forming piece) and the body portion of the saturated polyester bottle according to the present invention, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate can be used. And copolyester, i.e. isophthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, diethylene glycol, neopentyl glycol, cyclohexane dimethanol at least one component such as copolymerized polyethylene terephthalate can be used, Of these, the above-mentioned polyethylene terephthalate is preferably used.

The bottle-forming saturated polyester and the piece-forming saturated polyester used when molding the bottle may be the same or different, but the same type of saturated polyester is preferable.

Such saturated polyesters for forming bottles include various compounding agents such as crosslinking agents, heat resistance stabilizers, weather resistance stabilizers, antistatic agents, lubricants, mold release agents, inorganic fillers, pigment dispersants, pigments and dyes. May be included within a range that does not impair the object of the present invention.

Saturated polyester bottle 1 according to the present invention
The mouth plug part 2 has a crystallinity of 30 to 65 measured by a density method.
%, And the intrinsic viscosity is 0.55 to 0.85 dl
/ G in the range of a saturated polyester (a) for forming a bottle cap portion, and a saturated polyester (b) having a crystallinity of 10% or less measured by a density method are laminated at least two layers. Therefore, it has excellent heat resistance, mechanical strength and dimensional accuracy. Further, since the body portion 3 is formed of a stretched and molecularly oriented saturated polyester, it has excellent heat resistance, mechanical strength, dimensional accuracy, and excellent transparency. Since such a bottle according to the present invention has excellent heat resistance, the spout portion 2 will not be deformed even when the liquid is filled with a high temperature. Further, the saturated polyester bottle according to the present invention can be recovered and reused even when the spout and the body are made of different saturated polyesters, but the spout and the body are of the same type. When it is made of saturated polyester, it is particularly easy to recover and reuse.

[Method for producing saturated polyester bottle]
Next, the method for producing the saturated polyester bottle according to the present invention will be specifically described.

In the method for producing a bottle according to the present invention, first, saturated polyester is injected into a mold to heat the bottle mouthpiece forming piece at the same time as or after the piece is formed, and the crystallinity measured by the density method is measured. In the range of 30 to 65%, preferably 35
-60% range and an intrinsic viscosity of 0.55-0.8
The range is 5 dl / g. The heating temperature of the bottle mouthpiece forming piece is 140 to 200 ° C., preferably 160 to 19
It is preferably in the range of 0 ° C. The heating can be performed inside or outside the mold, and the heating of the bottle mouthpiece forming piece outside the mold can be performed by irradiating infrared rays or electromagnetic waves.

The piece-forming saturated polyester as described above is used to form the bottle mouthpiece-forming piece. The heating and melting temperature of the saturated polyester for forming pieces during molding varies depending on the saturated polyester used, but in the case of polyethylene terephthalate preferably used in the present invention, it is 260 to 320 ° C., preferably 270 to 270 ° C.
It is preferably 310 ° C.

The obtained bottle mouthpiece forming piece is preferably subjected to the next bottle forming step while keeping the temperature within the temperature range represented by the following formula using, for example, an oven.

Tg−65 ≦ T (° C.) ≦ Tg + 10 (where Tg is the glass transition point of the saturated polyester forming the bottle mouthpiece forming piece, and T is the temperature of the bottle mouthpiece forming piece). ) More specifically, for example, when the piece forming saturated polyester is polyethylene terephthalate, the Tg is about 80 ° C.
It is desirable to keep the temperature in the temperature range of 90 ° C, preferably 20 to 75 ° C.

The saturated polyester for forming a piece is
When it is composed of two or more kinds of saturated polyester, it is desirable to keep the temperature range obtained by the above formula from the glass transition point (Tg) of each saturated polyester within a temperature range that satisfies both.

The heat retention temperature of the bottle mouthpiece forming piece is T
If the temperature is lower than g-65 ° C, the adhesion between the bottle mouthpiece forming piece and the saturated polyester forming the mouthpiece may be insufficient, so that the content may leak when molded into a bottle. The heat retention temperature of the bottle mouthpiece forming piece is T
When the temperature exceeds g + 10 ° C, the adhesiveness with the saturated polyester for forming the spout part is good, but the dimensional stability deteriorates, so the contents may leak after capping.

Then, saturated polyester (saturated polyester for bottle formation) is injected into a mold into which the bottle mouth plug formation piece is inserted, and the bottle mouth plug formation piece and the injected saturated polyester are formed. A preform including a preform plug portion formed of at least two layers and a preform body formed of injection-molded saturated polyester is formed. At this time, the heating temperature of the saturated polyester varies depending on the saturated polyester used, but in the case of polyethylene terephthalate preferably used in the present invention, it is 260 to 320.
It is desirable that the temperature is ℃, preferably 270 to 310 ℃. The piece forming saturated polyester and the bottle forming saturated polyester are preferably the same type of saturated polyester.

Then, the preform is heated to a temperature suitable for stretching and stretch blown to mold a bottle. In this way, a layer (bottle) composed of a saturated polyester (a) having a crystallinity measured by a density method in the range of 30 to 65% and an intrinsic viscosity in the range of 0.55 to 0.85 dl / g. A piece for forming a plug part) and at least two layers in which a layer made of a saturated polyester (b) having a crystallinity measured by a density method of 10% or less is laminated, and a trunk part is a stretched saturated polyester A saturated polyester bottle consisting of is obtained.

The bottle may be heat set,
In that case, the heat setting may be performed simultaneously with the stretch blow molding or after the molding.

[0051]

The bottle mouthpiece forming piece according to the present invention has a crystallinity of 30 to 65% as measured by the density method and an intrinsic viscosity of 0.55 to 0.85 dl / g. As it is made of saturated polyester in the range, heat resistance,
It has excellent dimensional stability and mechanical strength, and also has excellent adhesiveness with saturated polyester that forms the spout. When this bottle mouthpiece forming piece is used as a part of the bottle mouthpiece, a bottle mouthpiece having excellent heat resistance, dimensional stability and mechanical strength can be obtained.

The saturated polyester bottle according to the present invention has a mouth plug having a crystallinity of 30 to 30 as measured by the density method (a).
65% range and an intrinsic viscosity of 0.55 to 0.8
It is composed of at least two layers in which a saturated polyester having a range of 5 dl / g and (b) a saturated polyester having a crystallinity of 10% or less measured by a density method are laminated, and a body part is made of stretched saturated polyester. Therefore, the spout has excellent heat resistance, dimensional stability, and mechanical strength, and the body has excellent heat resistance, dimensional stability, mechanical strength, and transparency. Further, since such a bottle has excellent heat resistance, the spout portion is not deformed even when the liquid is filled at a high temperature. Further, in the bottle made of saturated polyester according to the present invention, when the spout part and the body part are made of the same type of saturated polyester, the bottle does not contain different kinds of resin, and thus the collection and reuse thereof are particularly easy.

[0053]

The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

In the present invention, the physical properties of the bottle are measured as follows. [Buckling strength] The maximum load (kg) when 5% deformed by applying a compressive load to the spigot portion left in an oven at 90 ° C for 10 minutes using a tensile tester manufactured by Instron was taken as the buckling strength. did.

[Dimensional Change] The dimensional change in the outer diameter of the spigot portion after immersion in hot water at 90 ° C. for 10 minutes was measured and determined by the following formula.

Dimensional change (%) = {(before immersion-after immersion) /
Before immersion} × 100 [Capping property] Capping was performed under a load of 180 kg, and the presence or absence of cracks and chips at the plug portion was examined. Sample 20
The number of cracks and chips in 0 is shown in percentage.

[Drop impact] 18 filled with hot water at 90 ° C
The bottle capped with a 0 kg load is immersed in a water tank at 20 ° C for 10 minutes, cooled, and then placed at 10 ° to the horizontal surface.
It was dropped on a tilted iron plate from a height of 10 cm with the plug portion facing down, and allowed to stand for 1 day, and the presence or absence of water leakage was examined. Sample 200
In the book, the number of leaked contents liquids is shown as a percentage.

[Adhesiveness] The bottle mouth plug portion was cut, and the presence or absence of peeling between the bottle mouth plug portion forming piece and the bottle forming saturated polyester was examined. The number of peeled lines in 100 samples is shown in percentage.

[0059]

Example 1 Polyethylene terephthalate (PET)
[J120 manufactured by Mitsui Pet Resin Co., Ltd., intrinsic viscosity 0.73
[dl / g] was melted by heating at 270 ° C., injected into a mold at 175 ° C., and held in the mold kept at the same temperature for 30 seconds to mold a bottle mouthpiece forming piece. The crystallinity of the piece for forming the bottle plug portion was 50%.
The piece for forming the bottle plug portion was kept at a temperature of 50 ° C. in an oven.

Next, polyethylene terephthalate [J125 manufactured by Mitsui Pet Resin Co., Ltd., intrinsic viscosity 0.80 dl /
g] is melted by heating to 290 ° C. and injected into a mold into which the bottle mouthpiece forming piece obtained above is inserted.
A preform having a preform plug portion as shown in (A) was molded.

100% of this preform with an infrared lamp
The mixture was heated to ℃, then put in a bottle mold of 140 ℃, stretch blown with high pressure air of 27 kg / cm ² pressure to mold the bottle, and at the same time, heat set at 140 ℃ for 20 seconds.

The crystallinity of the plug portion of the obtained bottle other than the piece for forming the bottle plug portion was 5%, and the crystallinity of the barrel portion was 36%. The results of measuring the physical properties of the obtained bottle are shown in Table 1.

The results show that the buckling strength, the dimensional change, the capping property, the drop impact property and the adhesive property are all good.

[0064]

Comparative Example 1 Polyethylene terephthalate [J125 manufactured by Mitsui Pet Resin Co., Ltd., intrinsic viscosity 0.80 dl / g] was added to 2 parts.
It was heated and melted at 70 ° C., and injected into a mold at 10 ° C. to form a preform made of saturated polyester, in which the preform plug portion and the preform body portion were uniform.

100% of this preform with an infrared lamp
The mixture was heated to ℃, then put in a bottle mold of 140 ℃, stretch blown with high pressure air of 27 kg / cm ² pressure to mold the bottle, and at the same time, heat set at 140 ℃ for 20 seconds.

The degree of crystallinity of the stopper of the obtained bottle was 5%.
And the crystallinity of the body was 23%. The results of measuring the physical properties of the obtained bottle are shown in Table 1.

The results show that the buckling strength is low, the dimensional change is large, and the drop impact resistance is poor.

[0068]

Example 2 Polyethylene terephthalate similar to the polyethylene terephthalate used in Example 1 was heated and melted at 270 ° C. and injected into a mold at 10 ° C. to mold a bottle mouthpiece forming piece. Insert a cylindrical iron jig matching the inner diameter of the obtained bottle mouth plug forming piece,
Infrared heat from outside for 3 minutes (maximum piece temperature 175
℃). The crystallinity of the piece for forming the bottle plug portion was 42%. This piece for forming a bottle plug portion was kept warm in an oven at a temperature of 50 ° C.

Using this bottle mouthpiece forming piece, a bottle was molded in the same manner as in Example 1. The results of measuring the physical properties of the obtained bottle are shown in Table 1.

The results show that the buckling strength, the dimensional change, the capping property, the drop impact property and the adhesive property are all good.

[0071]

Comparative Example 2 In the same manner as in Comparative Example 1, a preform made of saturated polyester, in which the preform spout and the preform barrel were uniform, was molded.

A cylindrical iron jig matching the inner diameter of the plug portion was inserted into the plug portion of the obtained preform, and heated from outside with infrared rays for 3 minutes (maximum piece temperature 175 ° C.).
The crystallinity of the plug portion of this preform was 28%.

This preform was heated to 100 ° C., then placed in a bottle mold at 140 ° C., and the pressure was 27 kg / cm.
At the same time that the bottle was molded by stretch-blowing with the high-pressure air of No. ² , it was heat set at 140 ° C. for 20 seconds.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the buckling strength is low, the dimensional change is large, and the drop impact resistance is poor.

[0075]

Comparative Example 3 Example 1 was repeated except that the molded bottle mouthpiece forming piece was kept at a temperature of 5 ° C.
A bottle was molded in the same manner as in.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the drop impact resistance is poor and the adhesiveness is insufficient.

[0077]

Comparative Example 4 A bottle was molded in the same manner as in Example 1 except that the molded bottle mouthpiece forming piece was kept at a temperature of 90 ° C.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the dimensional changes are large and the drop impact resistance is poor.

[0079]

Example 3 Polyethylene terephthalate [J120 manufactured by Mitsui Pet Resin Co., Ltd.] was used as the saturated polyester used in the piece for forming the bottle cap portion in Example 1.
And polybutylene terephthalate (PBT) [intrinsic viscosity 0.85 dl / g] in a weight ratio (PET / PBT) of 75
Use pellet-blended to be / 25,
A bottle was molded in the same manner as in Example 1 except that the molded bottle mouthpiece forming piece was kept at a temperature of 30 ° C.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the buckling strength, dimensional change, capping property, drop impact property and adhesiveness are all good.

[0081]

Example 4 Polyethylene terephthalate [J120 manufactured by Mitsui Pet Resin Co., Ltd.] was used as the saturated polyester used for the piece for forming the bottle cap portion in Example 1.
And polybutylene terephthalate (PBT) [intrinsic viscosity 0.85 dl / g] in a weight ratio (PET / PBT) of 50
Use pellet-blended so that it becomes / 50,
A bottle was molded in the same manner as in Example 1 except that the molded bottle mouthpiece forming piece was kept at a temperature of 30 ° C.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the buckling strength, dimensional change, capping property, drop impact property and adhesiveness are all good.

[0083]

Example 5 Polybutylene terephthalate (PBT) [intrinsic viscosity 0.85 dl /
g] was used, and a bottle was molded in the same manner as in Example 1 except that the molded bottle mouthpiece forming piece was kept at a temperature of 30 ° C.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the buckling strength, dimensional change, capping property, drop impact property and adhesiveness are all good.

[0085]

Example 6 Polyethylene terephthalate [J120 manufactured by Mitsui Pet Resin Co., Ltd.] was used as the saturated polyester used in the piece for forming the bottle cap portion in Example 1.
And polyethylene naphthalate (PEN) [intrinsic viscosity 0.
65 dl / g] and the weight ratio (PET / PEN) is 75/2
A bottle was molded in the same manner as in Example 1 except that the pellet-blended product of 5 was used, and the molded bottle mouthpiece forming piece was kept at a temperature of 70 ° C.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the buckling strength, dimensional change, capping property, drop impact property and adhesiveness are all good.

[0087]

Example 7 Polyethylene terephthalate [J120 manufactured by Mitsui Pet Resin Co., Ltd.] was used as the saturated polyester used in the piece for forming the bottle cap portion in Example 1.
And polyethylene naphthalate (PEN) [intrinsic viscosity 0.
65 dl / g] and the weight ratio (PET / PEN) is 50/5
A bottle was molded in the same manner as in Example 1 except that the pellet-blended product was used so as to be 0, and the molded bottle mouthpiece forming piece was kept at a temperature of 70 ° C.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the buckling strength, dimensional change, capping property, drop impact property and adhesiveness are all good.

[0089]

Comparative Example 5 Polyethylene terephthalate [J120 manufactured by Mitsui Pet Resin Co., Ltd.] was used as the saturated polyester used in the piece for forming the bottle cap portion in Example 1.
A bottle was molded in the same manner as in Example 1 except that polyethylene terephthalate having an intrinsic viscosity of 0.45 dl / g was used instead.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the capping property and the drop impact property are poor.

[0091]

Comparative Example 6 Polyethylene terephthalate [J120 manufactured by Mitsui Pet Resin Co., Ltd.] was used as the saturated polyester used in the piece for forming the bottle cap portion in Example 1.
A bottle was molded in the same manner as in Example 1 except that polyethylene terephthalate having an intrinsic viscosity of 1.0 dl / g was used instead.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the buckling strength is low, the dimensional change is large, and the drop impact resistance is poor.

[0093]

Comparative Example 7 A bottle was molded in the same manner as in Example 1 except that the mold temperature and the holding temperature were 90 ° C. and the crystallinity of the bottle mouthpiece forming piece was 25%. did.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. The results show that the buckling strength is low, the dimensional change is large, and the drop impact resistance is poor.

[0095]

Comparative Example 8 A bottle was molded in the same manner as in Example 1 except that the mold temperature and the holding temperature were 210 ° C. and the crystallinity of the bottle mouthpiece forming piece was 70%. did.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. From the results, it can be seen that the capping property and the drop impact property are poor and the adhesive property is poor.

[0097]

Embodiments 8 to 13 In Embodiment 1, FIG.
A bottle was molded in the same manner as in Example 1 except that a preform having a preform plug portion as shown in (G) was molded.

The results of measuring the physical properties of the obtained bottle are shown in Table 1. From the results, it can be seen that the buckling strength, the dimensional change, the capping property, the drop impact property and the adhesive property are all good.

[0099]

[Table 1]

[0100]

[Table 2]

[0101]

[Table 3]

[0102]

[Table 4]

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a bottle according to the present invention.

FIG. 2 is a schematic cross-sectional view of a bottle cap portion according to the present invention.

FIG. 3 is a schematic diagram showing how to determine Tg.

[Explanation of symbols]

 1 Bottle 2 Plug part 3 Body part 4 Support ring 5,5 'Piece for forming bottle plug part 6 Screw thread part 7 Upper shoulder part 8 Lower shoulder part 9 Bottom part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location // B29K 67:00

Claims (3)

[Claims] 1. A crystallinity measured by a density method is 30 to 65%.
And an intrinsic viscosity of 0.55 to 0.85 dl /
A piece for forming a bottle plug portion, which is made of a saturated polyester having a range of g and forms a part of the bottle plug portion after forming the bottle plug portion. 2. A saturated polyester bottle comprising a plug part and a body part, wherein the plug part has a crystallinity in the range of (a) density method of 30 to 65% and an intrinsic viscosity of 0. A layer of saturated polyester in the range of 55 to 0.85 dl / g and (b) a crystallinity of 1 as measured by the density method.
A bottle made of saturated polyester, comprising at least two layers in which a layer made of 0% or less of saturated polyester is laminated, and a body portion made of stretched saturated polyester. 3. A saturated polyester has a crystallinity of 30 to 6 measured by a density method by heating at the same time as injection molding or after molding.
5% range and an intrinsic viscosity of 0.55 to 0.85
After molding the bottle mouth plug part in the range of dl / g, a bottle mouth plug part forming piece which is a part of the bottle mouth plug part is molded, and the temperature (T) of the obtained bottle mouth plug part forming piece is as follows. Tg-65 ≤ T (° C) ≤ Tg + 10 (where Tg is the glass transition point of the saturated polyester that forms the bottle mouthpiece forming piece, and T is the bottle). It is the temperature of the piece for forming the mouth plug portion) Next, the saturated polyester is injected into the mold in which the piece for forming the mouth portion of the bottle is inserted, and the preform mouth portion is formed with the piece for forming the bottle mouth portion. And at least two layers of the saturated polyester injected, and the preform body is formed of the injection-molded saturated polyester to form a preform, and the obtained preform is stretched. A method for producing a bottle made of saturated polyester, characterized by low-molding.