JP3276752B2 - Glossy molded article and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to cosmetics, shampoos, rinses, foods, beverages, and the like, which require a particularly excellent appearance.
Useful as containers such as bottles for storing pharmaceuticals, detergents, etc.
The present invention relates to a molded article having gloss with a gloss distortion pattern and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, there have been various methods for imparting an excellent appearance such as high-grade appearance to a molded article such as a container. Generally, a method of adding a pearl pigment using mica or the like to a thermoplastic resin is performed, and a resin having a pearl tone is obtained by melt-molding the resin to which such a pearl pigment is added. Have been.

However, in the method of adding the pearl pigment, the only way to change the appearance of the molded article is to adjust the particle size and the amount of the pearl pigment, and the appearance of the molded article is changed. In particular, there has been a demand for a molded article having a variety of excellent appearances from the aspect of decoration.

[0004] Therefore, there has been proposed a molded article having a change in appearance by using a resin composition in which resins which are incompatible with each other are combined. For example, Japanese Patent Publication No. 61-39336
Japanese Patent Application Publication No. JP-A-2005-115139 discloses a container molded using a resin composition comprising 10 to 99% by weight of a polyester resin and 1 to 90% by weight of a polyolefin resin, wherein a thin portion thereof is oriented in at least one direction. Has been proposed.
JP-B-61-24253 discloses that 99.5 to 90% by weight of a polyester resin and 0.5% of a methacrylic resin are used.
Plastic cosmetic bottles obtained by stretch-blow molding a resin mixture consisting of 10 to 10% by weight have been proposed.

[0005] However, a molded article molded by a usual method using a resin composition obtained by blending the above-mentioned mutually incompatible resins is not only beautiful in appearance, but also has a high appeal such as giving a sense of quality. There were only textures due to the resin composition, that is, metallic luster, fine-grained soft luster, etc., and no change in appearance such as the provision of a gloss distortion pattern was found. Further, in order to further impart a pattern or the like as a decoration to the molded article, the molded article is provided with irregularities by embossing or the like, or a coloring agent is added, or the container is subjected to printing, decoration such as hot stamping or the like. And the like, and did not make use of the luster of the material of the container, and thus did not bring about a remarkable change in appearance such as imparting a glossy distortion pattern.

[0006] Japanese Patent Application Laid-Open No. 5-163363 discloses a molded article molded using a resin composition in which resins which are incompatible with each other are blended, and the molded article is partially formed to substantially the degree of molecular orientation of a matrix phase. A molded article having the above difference has been proposed, but the molded article simply forms a transparent portion and an opaque portion in the molded article, and further improves the sense of quality of the molded article. For this reason, the appearance was not changed by, for example, providing a glossy distortion pattern.

Furthermore, the applicant of the present application has proposed a molded article molded using a resin composition in which resins which are incompatible with each other are blended, wherein the molded article has a gloss in which a dispersed phase is oriented in a specific direction. However, the gloss of the molded article was a single one, and did not improve the luxuriousness or the like by giving a change in appearance such as imparting a glossy distortion pattern.

Accordingly, a first object of the present invention is to provide a molded article such as a container having a gloss with a glossy distortion pattern and giving a sense of quality. Further, a second object of the present invention is to provide a method for producing a molded article capable of controlling the intensity of gloss of the obtained molded article and exhibiting an arbitrary gloss distortion pattern.

[0009]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a specific internal structure obtained by using a specific resin composition and controlling the orientation direction of specific substantially bar-shaped dispersed particles is obtained. It has been found that a molded article having the following can achieve the above object, and that the above object can be achieved by imparting a temperature distribution to a preformed article before blow molding.

[0010] The present invention has been made based on the above-mentioned findings, and it has been found that 98 to 50 parts by weight of a thermoplastic polyester resin (A) and two or more thermoplastic resins (B) 2 which are incompatible with the thermoplastic polyester resin (A). Injection or extrusion molding of a resin composition comprising 50 parts by weight, wherein the difference in refractive index between the thermoplastic polyester resin (A) and the thermoplastic resin (B) in a non-oriented state at 25 ° C. exceeds 0.05. After molding the preform, the thermoplastic resin (B) has a substantially rod-like shape in a matrix of the thermoplastic polyester resin (A) obtained by blow molding the preform. A molded article that is oriented and dispersed in the flow direction of the resin composition at the time of molding the preformed article, and the orientation direction of the thermoplastic resin (B) is partially changed to an arbitrary direction. Characteristic And it provides a molded article having a gloss of.

Further, the present invention provides the following production methods (1) and (2) as preferred production methods for the molded article of the present invention.

(1) Thermoplastic polyester resin (A) 9
8 to 50 parts by weight, and the thermoplastic polyester resin (A)
And 2-50 parts by weight of a thermoplastic resin (B) that are incompatible with each other, and the difference in refractive index between the thermoplastic polyester resin (A) and the thermoplastic resin (B) in a 25 ° C. non-oriented state is 0. A method for producing a molded article, wherein a preformed article is molded by injection or extrusion molding of a resin composition exceeding 0.05, and the preformed article is blow-molded. A method of producing a glossy molded body, which comprises contacting a surface of the preformed body with a jig whose temperature is controlled to a temperature lower than the surface to form a temperature distribution, followed by blow molding.

(2) The present invention further relates to a thermoplastic polyester resin (B) 2 which is incompatible with 98 to 50 parts by weight of the thermoplastic polyester resin (A).
Injection or extrusion of a resin composition comprising 50 to 50 parts by weight, wherein the difference in refractive index between the thermoplastic polyester resin (A) and the thermoplastic resin (B) in a non-oriented state at 25 ° C. exceeds 0.05. After molding and forming a pre-formed body, a method for producing a formed body by blow molding the pre-formed body,
An object of the present invention is to provide a method for producing a glossy molded body, characterized in that the preformed body has a difference in wall thickness at one or more arbitrary portions.

Hereinafter, the glossy molded article of the present invention will be described in detail. As the thermoplastic polyester resin (A) (hereinafter referred to as “resin (A)”) used as one component of the resin composition in the present invention, a polyester resin whose main repeating unit is ethylene terephthalate is preferable. It can also be used. As specific examples, polyethylene terephthalate, copolymerized polyester of terephthalic acid and isophthalic acid and ethylene glycol, copolymerized polyester of terephthalic acid and ethylene glycol and 1,4-cyclohexanedimethanol, terephthalic acid and isophthalic acid and ethylene glycol Ethylene terephthalate-containing polymers such as copolyesters with propylene glycol are exemplified.

Further, the above-mentioned ethylene terephthalate-containing polymer includes, as copolymerization components, dicarboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanoic acid, p-oxybenzoic acid, and naphthalenedicarboxylic acid; One or more glycol components such as propylene glycol, polyethylene glycol, polytetramethylene glycol, and naphthalene diol may be copolymerized in the polymer in an amount of 10% by weight or less.

The resin (A) preferably has an intrinsic viscosity of 0.65 to 1.40, more preferably 0.7 to 1.20, and most preferably 0.75 to 1.20.
１．２1.20. If the intrinsic viscosity is less than 0.65, the impact resistance of the container is significantly impaired when the molded body is formed, or when the preformed body is molded by extrusion blow molding, the drawdown becomes severe and the molding is performed. If the ratio exceeds 1.40, injection blow molding or the like may be extremely difficult.

The molecular weight of the resin (A) is preferably 10,000 to 1,000,000 in terms of weight average molecular weight.

The thermoplastic resin (B) (hereinafter referred to as “resin (B)”) which is incompatible with the above resin (A) and used as another component of the resin composition in the present invention includes polyolefin resin, At least one resin selected from the group consisting of poly (meth) acrylic resins is exemplified. Specific examples include the following polymers and the like, and when used, one kind or two or more kinds can be used in combination. In addition, commercially available products can also be used.

Examples of the polyolefin resin include high-density polyethylene, low-density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-propylene-butadiene copolymer, ethylene-vinyl acetate copolymer, and poly-4-methyl- 1-pentene, ethylene-methacrylic acid copolymer and its alkali metal salt, acid-modified polyethylene modified with maleic anhydride, etc., acid-modified polypropylene, acid-modified ethylene-vinyl acetate copolymer, glycidyl methacrylate and the like were copolymerized. Olefin resins such as epoxy-modified polyethylene. Further, as the poly (meth) acrylic resin, methyl methacrylate, methyl acrylate, (hereinafter, both are collectively referred to as
Lower alkyl (meth) acrylates such as (meth) acrylate), ethyl (meth) acrylate and butyl (meth) acrylate; homopolymers such as (meth) acrylonitrile; and copolymerized (meth) acrylates obtained by copolymerizing these. (Meth) acrylate copolymers and the like.

Any of the polymers specifically listed as the resin (B) can exhibit gloss with a glossy distortion pattern when combined with the resin (A). Among them, polymethyl methacrylate, polyethylene, polypropylene , An ethylene-vinyl acetate copolymer is particularly preferred for forming a substantially rod-like structure.

The molecular weight of the resin (B) is preferably 10,000 to 1,000,000 in terms of weight average molecular weight.

In the present invention, the mixing ratio of the resin (A) and the resin (B) in the resin composition is such that the resin (A) is in the range of 98 to 50 parts by weight and the resin (B)
In the range of 2 to 50 parts by weight, preferably in the range of 95 to 60 parts by weight of the resin (A), in the range of 5 to 40 parts by weight of the resin (B), Preferably, the resin (A) is in the range of 90 to 70 parts by weight, and the resin (B) is in the range of 10 to 30 parts by weight. If it is outside the above range, not only a molded article having a desired gloss distortion pattern cannot be obtained, but also sufficient gloss cannot be exhibited.

In the resin composition, the difference in refractive index between the resin (A) and the resin (B) in a non-oriented state at 25 ° C. must exceed 0.05, and is preferably A combination of 0.06 or more is desirable. Further, between the resin (A) and the resin (B), the refractive index of (A) is preferably higher. The difference in the refractive index is 0.
If it is less than 05, not only a molded article having a desired gloss distortion pattern cannot be obtained, but also the gloss itself becomes weak, which is not preferable. As the resin (A) and the resin (B) which are particularly preferably combined to satisfy the difference in the refractive index, polyethylene terephthalate, a copolymer of terephthalic acid, ethylene glycol and 1,4-cyclohexanedimethanol as the resin (A) is preferable. Polymerized polyester and the like can be mentioned, and as the resin (B), polymethyl methacrylate, polyethylene, polypropylene, ethylene-vinyl acetate copolymer and the like can be mentioned.

In the present invention, additives such as a coloring agent such as a pigment or a dye, an antistatic agent, a releasing agent, a nucleating agent and the like are added to the above resin composition within a range that does not impair the gloss accompanying the gloss distortion pattern. Can be added to the resin (A) phase as a matrix or the resin (B) phase as a dispersed phase.

The molded article of the present invention is obtained by injection or extrusion molding the above resin composition to form a preformed article, and then blow molding the preformed article to obtain the resin (A). A) wherein the resin (B) is dispersed in the matrix of (a) in a substantially rod-like shape and oriented in the flow direction of the resin composition at the time of forming the preform;
The orientation direction of the resin (B) is a molded body partially changed to an arbitrary direction.

The injection or extrusion molding can be carried out by a known method without any particular limitation.
A method in which the resin composition is previously kneaded and supplied to a molding machine, or a dry-blended resin composition is directly supplied to a molding machine to be molded and blow molded is used.

Specifically, the “substantially rod-like shape” is preferably a shape that satisfies the following expression. If the values are out of the ranges of the following formulas, the distortion of the reflected light is less likely to occur, and a glossy distortion pattern is less likely to be exhibited.

1 ≦ P / Q ≦ 10 Formula (P + Q) /L≦0.5 Formula where L, P and Q indicate the size of the shape of the particles formed by the resin (B). Is the value of L: Average length in the elongation direction of particles (μm) P: Average major axis when a cross section perpendicular to the elongation direction of particles is approximated as an ellipse Q: Cross section perpendicular to the elongation direction of particles as an ellipse Average minor diameter when approximated (μm)

Further, the expression "the resin composition is oriented and dispersed in the flow direction of the preformed article at the time of molding the preformed article" means that the resin composition in the molten state at the time of injection or extrusion molding flows. Towards this, it means that the substantially rod-shaped resin (B) is oriented and dispersed.

The expression "partially changed in an arbitrary direction" means that the orientation direction of the resin (B) in an arbitrary portion of the molded body is changed in a direction different from the flow direction. Means that.

That is, the molded article of the present invention is prepared by first injecting or extruding the above-mentioned resin composition, so that the above-mentioned resin (B) is substantially rod-shaped and oriented in the flow direction of the resin composition. When the molded article is obtained and then the preformed article is blow-molded, the resin (B) having the substantially rod shape is obtained by, for example, applying a temperature distribution to an arbitrary position (partially) of the preformed article. Is a molded article in which the orientation direction of the resin is partially changed to an arbitrary direction. As shown in FIG. 1, the resin (B) as a dispersed phase is regularly oriented as an internal structure of the molded article. It has a part and a part arranged irregularly. In FIG. 1, a is the resin (A) and b is the resin (B).
, And the arrow indicates the flow direction of the resin.

Further, the molded article of the present invention has a layered structure composed of a layer made of the above resin composition and a layer formed using a resin other than the above resin composition in the thickness direction. Is also a molded article having a desired gloss. In this case, the molded article of the present invention has the above internal structure at an arbitrary position in the thickness direction of the molded article (layer made of the resin composition).

However, the molded article of the present invention can express an arbitrary pattern or the like without giving irregularities to the molded article by decoration such as printing or embossing.
Specifically, for example, in the central portion of the cylindrical bottle, the surface of the formed body is a quadratic curved surface, but an arbitrary gloss distortion pattern can be expressed by the shape of the irregularly arranged portion. is there. Examples of the gloss distortion pattern include a dot polka dot pattern and letters such as alphabets, but are not limited thereto.

The mechanism for developing the glossy distortion pattern is considered as follows. The above resin (B) having a substantially rod shape
The direction of light reflection greatly differs between the orientation direction of the object and the direction at 90 ° to the direction, and light streaks extending in both directions at 90 ° to the orientation direction centered on the reflection of the light source on the surface of the molded body. However, it is considered that, by disturbing the orientation direction of the resin (B) having the substantially rod shape, the reflected light is distorted, and a glossy distortion pattern appears.

In the molded article of the present invention, the portion of the molded article in which the orientation direction of the thermoplastic resin (B) has been changed is used to further enhance the gloss distortion pattern. It is preferable that the surface has a thick portion protruding like a bump or a mountain range. The above-mentioned bulge of the thick portion may be on the inner surface or the outer surface of the molded body,
Preferably it is the inner surface.

The height of the ridge is preferably 0.2 mm or more, more preferably 0.3 mm or more, and most preferably 0.1 mm or more.
5 mm or more.

Here, the “height of the bulge” means a difference between the maximum thickness of the thick part and the minimum thickness in the vicinity of the thick part. It is not necessary that all parts are 0.2 mm or more.

The raised thick portion can be easily confirmed with the naked eye. However, since the reflection intensity at the thick portion is different from that of the other portions, the thick portion raised like a bump or a mountain range is The gloss distortion pattern becomes clearer due to the increase of internal diffuse reflection light than other parts due to the thick part, so that it can be confirmed also by measuring the change in the reflection intensity of the thick part and its peripheral part. It is considered possible.

Next, the method for producing a glossy molded article of the present invention will be described in detail.

[Explanation of the above-mentioned production method (1)] In the production method (1) of the molded article having luster of the present invention, the above-mentioned resin composition is injection- or extrusion-molded to form a pre-molded article. A method for producing a preform by blow molding a preform, comprising: contacting a surface of the preform with a jig temperature-controlled to a temperature lower than the surface temperature before blow molding the preform. In this case, a temperature distribution is obtained, and then blow molding is performed.

The production method (1) of the present invention will be described with time. In the production method (1) of the present invention, the following (I)
(III) is sequentially performed.

(I) First, the resin composition is injection or extrusion molded to form a preform. As a method used at this time, a known injection molding method or a known extrusion molding method is used without any particular limitation. Specifically, injection molding, co-injection molding (sandwich molding, two-color molding), Extrusion molding or co-extrusion molding may, for example, be mentioned. The thickness of the obtained preformed body is preferably 1 to
It is in the range of 8 mm, more preferably in the range of 2 to 7 mm, and most preferably in the range of 2 to 5 mm. If it is less than 1 mm, blow molding may be difficult, and if it exceeds 8 mm, it may be difficult to impart a temperature difference due to the heat of the preformed body. Therefore, it is preferable to be within the above range. Further, the shape of the preform is preferably a test tube, cup, bag or the like.

The preformed body may be a cold parison method in which a preformed room temperature preformed body is heated above the glass transition temperature of the resin (A) and then blow molded. Immediately after molding, the preformed body can be supplied to the next step (II) in a heated state by a hot parison method or the like in which the preformed body is blow-molded while maintaining the glass transition temperature of the resin (A) or higher. .

(II) Next, the jig is brought into contact with the preform to form a temperature distribution. At this time, the jig may be brought into contact with either the inner surface or the outer surface of the preform, but the jig is preferred from the outer surface because the temperature difference is strict and the glossy distortion pattern is likely to be clear.

The temperature of the preform (surface temperature of the preform immediately before blowing) is preferably 70 to 200.
° C, more preferably in the range of 80 to 150 ° C, most preferably in the range of 90 to 130 ° C. If the temperature is lower than 70 ° C., the preformed body may be too hard and blow molding may be difficult. If the temperature is higher than 200 ° C., on the contrary, the preform may be too soft and blow molding may be difficult. Is preferred.

The temperature of the jig is lower than the surface temperature of the preform, preferably 120 ° C. or less, more preferably 100 ° C. or less, and most preferably 80 ° C. or less.
~ -80 ° C. If the temperature exceeds 120 ° C., the molding conditions must be considerably limited in order to provide a temperature distribution, and it may be difficult to provide a temperature distribution in a normal operation. Therefore, the temperature is preferably set to 120 ° C. or lower.

Further, the contact time of the jig is not particularly limited depending on the molding conditions of the preformed body.
Preferably it is in the range of 1 to 40 seconds, more preferably 3 to 30 seconds, most preferably 5 to 25 seconds. If the time is less than 1 second, the glossy distortion pattern becomes unclear, and if the time is more than 40 seconds, the molding cycle becomes unreasonable.

The temperature difference between the portion in contact with the jig and the other portion is not particularly limited since the value varies depending on the thickness of the preform and the like.
It is preferable to adjust the temperature to be in the range of 0 ° C, more preferably in the range of 5 to 50 ° C, and most preferably in the range of 10 to 50 ° C. If the temperature is lower than 2 ° C., the glossy distortion pattern may be unclear, and if the temperature is higher than 50 ° C., blow molding may be difficult.

That is, in the present step, a temperature distribution is given to a portion (80 to 250 ° C.) where the jig does not contact the preformed body and a portion (10 to 150 ° C.) where the jig contacts the preformed body. Is supplied to the next step of blow molding.

(III) Finally, the preformed body having the temperature distribution as described above is blow-molded to obtain a formed body.
As the blow molding method, a known blow molding method such as a stretch blow molding method is used without particular limitation.
The stretch ratio when performing blow molding is uniaxial,
Preferably it is in the range of 1.1 to 10 times, more preferably 1.
A range of 1 to 8 times, most preferably a range of 1.1 to 5 times is preferred. If the stretching ratio is less than 1.1, the glossy distortion pattern may be unclear, and if it exceeds 10 times, the film may be excessively stretched and a difference in wall thickness may not be easily obtained. Is preferred. Also, at the time of blow molding, it does not matter whether or not the film is longitudinally stretched by a stretching rod for longitudinal stretching.

When forming the preform by injection or extrusion molding, the melt viscosity η of the resin (A) is
Η _B / η _A between _A and the melt viscosity η _B of the resin (B).
It is preferable to control the resin temperature and the shear rate so that the relationship of <0.5 is satisfied. The resin temperature is the temperature of the resin at the time of injection or extrusion molding, and is usually 180 to
The range is 330 ° C. The above-mentioned shear rate is a shear rate at an injection gate or an extrusion slit.

By controlling the resin temperature and the shearing rate so that the above relationship is satisfied, in the obtained molded article, the above-mentioned resin (B) having a substantially rod-like shape satisfying the above formula and A plastic molded article oriented in the flow direction of the resin composition is obtained. η _B
If / η _A ≧ 0.5, the shape of the resin (B) is not preferably a substantially rod-like shape satisfying the above formula and a nearly spherical shape may be formed, which is not preferable.

[Explanation of the above-mentioned production method (2)] In the production method (2) of the molded article having luster of the present invention, the above-mentioned resin composition is injection- or extrusion-molded to form a pre-molded article. A method of manufacturing a preform by blow molding a preform, wherein the preform has a thickness difference at any one or two or more portions.

Here, the method of molding a preform by injection or extrusion molding and the method of blow molding the preform are described in [Description of the above-mentioned production method (1)].
This is the same as the method described in detail in (I) and (III). That is, the production method (2) of the present invention is the same as the production method (1) described above.
Instead of the step (II), the following step (II) ′ is performed.

(II) 'A thickness difference is formed in any one or more portions of the preform. To form the thickness difference,
It is preferable to carry out simultaneously with the molding of the preform by the injection or extrusion molding (that is, simultaneously with the step (I)). Specifically, for example, this step can be performed by performing injection or extrusion using a die or a slit or the like at the time of performing injection or extrusion using a shape having a desired thickness difference. . The above thickness difference is
It is preferably at least 0.3 mm, more preferably at least 0.5 mm, most preferably 0.7 to 7 mm. When the thickness is 0.3 mm or less, it is not preferable because the temperature distribution is difficult to be obtained and the pattern may be unclear.

The molded article of the present invention generally requires an excellent appearance as described below, and is suitable as a container or the like requiring a sales promotion effect. For example, moisture lotion,
Various skin lotions such as massage lotion, skin lotion, cleansing lotion, emollient lotion, baby oil, skin creams such as under makeup cream, burnishing cream, emollient cream, various face care such as liquid foundation, etc.
Hair care products such as skin care, body care, makeup cosmetics, shampoo, rinse, hair conditioner, permablowing agent, hair color, etc., body care such as whole body cleaning, liquid hand soap, hand care products, liquid clothing detergent, mold remover, Containers for filling things that generally require an excellent appearance, such as glass cleaners, bleaching agents, softeners, pastes, dishwashing detergents, cleansers, various household detergents, foodstuffs, and pharmaceuticals.

[0057]

The present invention will be specifically described below with reference to examples.
The present invention is not limited only to these examples.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 1.05 and a refractive index of 1.575 [trade name, “Mitsui PET J15, manufactured by Mitsui Pet Resins Co., Ltd.”
5 "), a resin (A) dried with hot air at 150 ° C. overnight,
Polymethyl methacrylate having a refractive index of 1.490 (trade name, “Delpet 560F”, manufactured by Asahi Kasei Corporation)
The resin (B) dried at 760 mmHg under reduced pressure overnight was mixed at a weight ratio of 88:12, and the resin temperature was about 280 ° C.
Kneading with 2 axes [φ45mm Ikegai Iron and Steel Co., Ltd., trade name,
"PCM45-30"], extruded into strands,
After cooling, it was cut with a cutter to obtain pellets.

The melt viscosities of these resins were measured using “Capillograph 1B” (trade name, manufactured by Toyo Seiki Seisaku-sho, Ltd.).
The melt viscosity ratio was 0.37 as measured by the resin temperature and the shear rate during molding.

A hot parison type stretch blow molding machine [Nissei ASB Co., Ltd., trade name “ASB”
50MH "], first, injection molding is performed, and the resin amount is 2
A preform having a test tube shape of 3 g, a length of about 104 mm and a wall thickness of about 3 mm was obtained. The surface temperature of the obtained preform was measured with an infrared imaging device [trade name “T” manufactured by Nippon Avionics Co., Ltd.
VS-5000 "]. Then, as shown in FIG. 2, a circular jig whose temperature was controlled to about 2 ° C. on each side of the preformed body in a direction opposite to the parting line (both front and back of the bottle) when the bottle was formed into a bottle, three points on each side. Each was contacted for 10 seconds to give a temperature distribution. Thereafter, it is blow-molded by stretch blow molding in a circumferential direction of 2.8 times and a height direction of 1.8 times, and has a content of about 300 ml, a height of about 180 mm, a width of about 70 mm,
A flat bottle having a flat shape with a thickness of about 42 mm was obtained. still,
In FIG. 2, 1 indicates a preform and 2 indicates a jig.

At this time, the surface temperature of the preformed body immediately before blowing was measured using the above-mentioned infrared imaging apparatus. As a result, the temperature was controlled at about 114 ° C. by the circular jig and about 125 ° C. at the other parts. The temperature difference between the part where the jig was brought into contact and the other part was 11 ° C. In the obtained flat bottle, as shown in FIG. 3, a beautiful glossy distortion pattern of a dot pattern can be visually recognized on the front surface, and a difference in wall thickness of about 0. There was an 8 mm bump.

[Example 2] Parting line direction (both sides of the bottle) when the preformed body was formed into a bottle
Then, a preform was formed in the same manner as in Example 1 except that a circular jig was brought into contact with three points on each side to give a temperature distribution, followed by blow molding to obtain a flat bottle. In the obtained flat bottle, a beautiful dot-patterned glossy distortion pattern can be visually recognized on both sides thereof, and a bump having a thickness difference of about 1.2 mm is formed on the inner surface of the portion where the pattern was visually recognized. Was.

Example 3 Preform molding and blow molding were carried out in the same manner as in Example 1, except that a jig in the shape of the letter "S" was brought into contact with the surface of the preform and a temperature distribution was applied. To obtain a flat bottle. As shown in FIG. 4, in the obtained flat bottle, an “S” -shaped glossy distortion pattern was visually recognized, and a bump having a thickness difference of about 0.6 mm was formed on the inner surface of the bottle.

Example 4 Injection molding was performed to obtain a resin amount of about 33.
g, circumference length about 180mm, length about 104mm, wall thickness 3.2
Example 1 except that protrusions having a thickness of about 4.2 mm (thickness difference of about 1 mm) and a width of about 3.5 mm were provided on the inner surface side as vertical streaks extending from the top to the bottom of the preform. A flat bottle was obtained in the same manner as in Example 1 except that a preform was molded in the same manner as in Example 1, and that the jig was not contacted and the stretching ratio in the circumferential direction was 2.1 times. FIG. 5 shows a radial sectional view of the preform. In the obtained flat bottle, the portion of the protrusion is about 1.4 mm in thickness, and its peripheral part is about 0.5 mm.
And the thickness difference was about 0.9 mm. In the obtained flat bottle, a beautiful vertical streak-like glossy distortion pattern could be visually recognized.

Comparative Example 1 A preform was molded and blow-molded in the same manner as in Example 1 except that the preform was subjected to blow molding without temperature control using a circular jig. Got a bottle. The obtained flat bottle is
Although glossy, the gloss was homogeneous and was not accompanied by a glossy distortion pattern.

[0066]

The molded article having luster of the present invention has luster accompanied by a glossy distortion pattern and gives a sense of quality. Moreover, according to the method for producing a glossy molded article of the present invention, the glossiness of the resulting molded article can be controlled to develop an arbitrary gloss distortion pattern.

[Brief description of the drawings]

FIG. 1 is an enlarged schematic view showing a dispersed state (internal structure) of a resin in a molded article of the present invention.

FIG. 2 is a schematic diagram showing a mode in which a jig is brought into contact with a preform in Example 1.

FIG. 3 is a front view showing the bottle obtained in Example 1.

FIG. 4 is a front view showing the bottle obtained in Example 3.

FIG. 5 is a radial cross-sectional view of a preform used in Example 4.

Continuation of the front page (56) References JP-A-6-255643 (JP, A) JP-A-6-80789 (JP, A) JP-A-5-125199 (JP, A) JP-A-5-163363 (JP) , A) JP-A-54-32562 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 49/00 B65D 1/02 B65D 1/09 C08J 5/00

Claims (6)

(57) [Claims] 1. A thermoplastic polyester resin (A) 98-
50 parts by weight, and 2 to 50 parts by weight of a thermoplastic resin (B) that is incompatible with the thermoplastic polyester resin (A), wherein the thermoplastic polyester resin (A) and the thermoplastic resin (B) A resin composition having a difference in refractive index in a non-aligned state at 25 ° C. of more than 0.05 is injection-molded or extruded to form a preform, and then the preform is blow-molded. A molded article obtained by dispersing the thermoplastic resin (B) in a matrix of the thermoplastic polyester resin (A) in a substantially rod-like shape and oriented in the flow direction of the resin composition at the time of molding the preformed article. A molded article having luster, wherein the orientation direction of the thermoplastic resin (B) is partially changed to an arbitrary direction. 2. A portion of the molded body in which the orientation direction of the thermoplastic resin (B) is changed forms a thick portion protruding like a bump or a mountain range on the inner surface of the molded body. The molded article having luster according to claim 1, characterized in that: 3. The thermoplastic polyester resin (A)
The molded article having luster according to claim 1 or 2, which has ethylene terephthalate as a main repeating unit and has an intrinsic viscosity of 0.65 to 1.40. 4. The thermoplastic resin (B) is at least one resin selected from the group consisting of a polyolefin resin and a poly (meth) acrylic resin. A molded article having gloss according to any one of the above. 5. A thermoplastic polyester resin (A) 98-
50 parts by weight, and 2 to 50 parts by weight of a thermoplastic resin (B) that is incompatible with the thermoplastic polyester resin (A), wherein the thermoplastic polyester resin (A) and the thermoplastic resin (B) A resin composition having a difference in refractive index in a non-oriented state at 25 ° C. of more than 0.05 is injection-molded or extruded to form a preform, and then the preform is blow-molded. Prior to blow molding the preformed body, a temperature controlled jig at a temperature lower than the surface temperature is brought into contact with the surface of the preformed body to form a temperature distribution, and then blow molding is performed. A method for producing a molded article having a characteristic gloss. 6. A thermoplastic polyester resin (A) 98-
50 parts by weight, and 2 to 50 parts by weight of a thermoplastic resin (B) that is incompatible with the thermoplastic polyester resin (A), wherein the thermoplastic polyester resin (A) and the thermoplastic resin (B) A resin composition having a difference in refractive index in a non-oriented state at 25 ° C. of more than 0.05 is injection-molded or extruded to form a preform, and then the preform is blow-molded. A method for producing a molded article having luster, characterized in that the preformed article has a thickness difference at any one or two or more portions.