JP2000212418A - Highly concentrated dispersed form of inorganic ultraviolet absorber and its molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a molding which provides both an ultraviolet absorbing effect and transparency, produced by molding a resin composition obtained by diluting a highly concentrated dispersed form of an inorganic ultraviolet absorber in which an inorganic ultraviolet absorber is dispersed in a polyester resin, with a resin as a base of the molding. SOLUTION: This highly concentrated dispersed form of an inorganic ultraviolet absorbent is composed of a polyester resin composition wherein 5-50 pts.wt. of the inorganic ultraviolet absorber having an ultraviolet absorbing effect is combined to 100 pts.wt. of a thermoplastic polyester resin and a resinous pigment dispersant having 500-10,000 of molecular weight measured by viscometry is combined to be set as 0.1<=R<=5 in the ratio R (R = addition amount of a resinous pigment dispersant/addition amount of an inorganic ultraviolet absorber).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-concentration dispersion of an inorganic ultraviolet absorbent in which an inorganic ultraviolet absorbent having an ultraviolet absorbing effect is dispersed in a polyester resin at a high concentration.
The present invention relates to a molded article obtained by using the inorganic ultraviolet absorbent high-concentration dispersion.

[0002]

2. Description of the Related Art Conventionally, plastic molded products include packaging materials typified by containers for foods, beverages, toiletries and cosmetics, as well as mechanical materials, electric and electronic materials, optical materials, building materials, and the like. Used in a wide range of fields. These plastic molded articles may be added with various additives in order to impart functionality according to the purpose of use, and examples thereof include ultraviolet absorbers.

[0003] Ultraviolet light refers to electromagnetic waves having a wavelength of 100 to 400 nm, and the energy of light in this region is C, H,
O binding energy (70-110 kcal / mol)
It has the same energy as. Therefore, mainly C,
A plastic molded article composed of a bond of H and O may break the bond when irradiated with ultraviolet rays, resulting in deterioration of the resin, discoloration, and reduction in mechanical strength. On the other hand, not only plastic molded articles, but also contents to be filled into packaging materials, especially toiletries and cosmetics, may be accompanied by discoloration, deterioration, and decomposition of drugs due to irradiation of ultraviolet rays.

[0004] In order to solve such problems, the above-mentioned ultraviolet absorber is blended into a plastic molded product. In general, organic ultraviolet absorbers are often used as ultraviolet absorbers, and typical examples thereof include phenyl salicylate, 2-hydroxy-4-methoxybenzophenone, and 2 (2'-hydroxy-5-methylphenyl) benzotriazole. Is mentioned. The organic UV absorber can be provided with a transparent and UV-absorbing ability by being kneaded into a plastic molded product.

However, the organic UV absorber has a problem that the molded product is colored due to its UV absorption mechanism. In the case of plastic molded articles, this problem of coloring is accompanied by poor appearance, and it is desirable to avoid this problem as much as possible. Accordingly, cases in which an inorganic ultraviolet absorber is used in place of these organic ultraviolet absorbers have been increasing. Typical examples thereof include zinc oxide, titanium oxide, cerium oxide, iron oxide and the like.

When such an inorganic ultraviolet absorber absorbs ultraviolet rays, electrons are generated in the conduction band of the inorganic ultraviolet absorber and holes are generated in the valence band. Some of these move to the surface of the inorganic ultraviolet absorber and form .OH or .OH by oxygen, moisture, heat, or the like. These radicals break down the resin
It causes deterioration (photocatalytic activity). The photocatalytic activity of the inorganic ultraviolet absorber acts disadvantageously in processing (melt kneading) of the resin composition to which the inorganic ultraviolet absorber is added.

First, even if a small amount of an inorganic ultraviolet absorbent is added to a resin, the resin is decomposed or deteriorated by photocatalytic activity, so that the resin is discolored (colored) and the molecular weight of the resin is reduced. Therefore, there is a possibility that the mechanical properties of the resin may be significantly reduced. Secondly, in order to reduce the photocatalytic activity as much as possible, a small amount of the ultraviolet absorber (0.01 to 0.5 with respect to 100 parts by weight of the resin) is melt-kneaded with the resin. It becomes difficult to provide a stable supply of the absorbent, and the concentration of the ultraviolet absorbent varies widely. As a result, the stability of the ultraviolet absorbing effect is lost. In addition, workability and processing efficiency are significantly reduced.
Third, in order to solve these problems, even if an attempt is made to create a high-concentration dispersion (master batch) in which an inorganic ultraviolet absorber is dispersed at a high concentration, the photocatalytic activity is too strong and the resin deteriorates. Melt kneading becomes impossible.

In order to reduce the photocatalytic activity of the inorganic ultraviolet absorber, the surface of the inorganic ultraviolet absorber is coated with an inorganic ultraviolet absorber such as silica or alumina, an aliphatic carboxylic acid, a metal salt or ester thereof, or a silicone. For example, a prescription for surface treatment is given. However, such a surface treatment results in increasing the material cost of the inorganic UV absorber.

In general, the surface tension of an inorganic ultraviolet absorber is smaller than that of a plastic, and the interaction between the inorganic ultraviolet absorber and the plastic is originally low. , The following problems arise.

Generally, the primary particles of the inorganic ultraviolet absorbent called ultrafine particles have a particle size on the order of several nm, and the size is smaller than the wavelength of visible light. If this inorganic ultraviolet absorber is dispersed in plastic in the form of primary particles, there is no problem of lowering the transparency of the plastic molded product. However, such an inorganic ultraviolet absorber is usually added to plastic in a state of secondary particles in which primary particles are aggregated, and is melt-kneaded. Also, when inorganic ultraviolet absorbent fine particles are added during plasticization and kneading of plastic, the dispersibility of the inorganic ultraviolet absorbent particles in the plastic is reduced due to the interaction between the particles during kneading.
Aggregation of secondary particles or secondary particles occurs, and secondary particles having a dispersed particle diameter of several μm to several tens μm are generated. When the particle diameter of the inorganic ultraviolet absorbent dispersed in the plastic is on the order of μm, visible light is scattered by the inorganic ultraviolet absorbent, and as a result, there is a problem that the transparency of the plastic molded article is significantly reduced. In addition, the fact that the secondary aggregated particles are dispersed means that more inorganic UV absorber is added than the amount at which the effect of adding the inorganic UV absorber is obtained, and as a result, the cost is reduced. It will take.

A high concentration dispersion of an inorganic ultraviolet absorber in which an inorganic ultraviolet absorber is dispersed at a high concentration can be obtained by mixing a small amount of the high concentration dispersion with a resin serving as a base of a molded article and diluting the resin. Although it is possible to obtain a molded article in which the ultraviolet absorber is dispersed in the added amount, as described above, if the dispersion state of the inorganic ultraviolet absorber is not good, the transparency is significantly reduced. In order to improve the transparency of the molded article obtained by diluting the inorganic ultraviolet absorbent high-concentration dispersion, it is necessary that the dispersion state of the inorganic ultraviolet absorbent be good even in the high-concentration dispersion.

In preparing a molded article using an inorganic ultraviolet absorbent, considering the workability, workability, quality of the molded article, and processing efficiency described above, the inorganic ultraviolet absorbent is dispersed at a high concentration. A high-concentration dispersion of a system ultraviolet absorber is indispensable. At the same time, consider a formulation that does not use a surface-treated inorganic UV absorber that is as costly as possible, and as much as possible use an inorganic UV absorber so as not to reduce the transparency of the molded product diluted with the high-concentration dispersion. At present, it is desired to obtain a high-concentration dispersion of an inorganic ultraviolet absorber having a good dispersion state.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a high concentration of an inorganic ultraviolet absorbent in which a high concentration of an inorganic ultraviolet absorbent is dispersed in a polyester resin. Further, it is an object of the present invention to provide a molded article having both an ultraviolet absorbing effect and transparency obtained by molding a resin composition obtained by diluting the high-concentration dispersion with a resin serving as a base of the molded article. And

[0014]

Means for Solving the Problems The present invention has been conceived to solve the above-mentioned problems, and the invention according to claim 1 is based on 100 parts by weight of a thermoplastic polyester resin.
5 to 50 inorganic ultraviolet absorbers having an ultraviolet absorbing effect
Parts by weight, and the molecular weight in the viscosity method is 500 to 1000
The ratio R of the resin-based pigment dispersant to the inorganic UV absorber (R = the amount of the resin-based pigment dispersant added /
(Inorganic ultraviolet absorber addition amount), a high concentration dispersion of the inorganic ultraviolet absorber, which is a polyester resin composition blended so as to satisfy 0.1 ≦ R ≦ 5.

According to a second aspect of the present invention, in the first aspect, the resin-based pigment dispersant is a carboxylic acid-modified product of any of polyethylene, polypropylene, and ethylene-propylene copolymer. A high-concentration dispersion of an ultraviolet absorber.

The third aspect of the present invention is the first or second aspect.
Wherein the inorganic ultraviolet absorbent having an ultraviolet absorbing effect is one of zinc oxide and titanium oxide, or a mixture thereof, wherein the inorganic ultraviolet absorbent is a high-concentration dispersion.

The invention described in claim 4 is the first or second invention.
Wherein the acid component of the thermoplastic polyester resin is selected from at least one of terephthalic acid, isophthalic acid, naphthalene 2,6 dicarboxylic acid, succinic acid, adipic acid, succinic acid, and sebacic acid. A high-concentration dispersion of an ultraviolet absorber.

The invention according to claim 5 is the invention according to claim 1 or 2
Wherein the diol component of the thermoplastic polyester resin is a glycol such as ethylene glycol, propylene glycol, butylene glycol, 1,4-cyclohexane dimethanol, or a polyoxyalkylene glycol such as polyethylene glycol, polypropylene glycol, or polytetramethylene glycol. And a high-concentration dispersion of an inorganic ultraviolet absorber characterized by being selected from at least one of the following.

The invention according to claim 6 is the first or second invention.
Wherein the thermoplastic polyester resin is a high-concentration dispersion of an inorganic ultraviolet absorber composed of a polymer of an oxyacid or a copolymer of an oxyacid.

According to a seventh aspect of the present invention, there is provided a resin as a base of a molded article, wherein the high-concentration dispersion of the inorganic ultraviolet absorber according to any one of the first to sixth aspects is blended to disperse the inorganic ultraviolet absorber. A molded article characterized by being diluted in an amount and molded with the diluted polyester composition.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

In the thermoplastic polyester resin of the present invention, the acid component is at least one of terephthalic acid, isophthalic acid, naphthalene 2,6-dicarboxylic acid, succinic acid, adipic acid, succinic acid and sebacic acid.
The diol component is formed by polymerization of at least one of glycols such as ethylene glycol, propylene glycol, butylene glycol, and 1,4-cyclohexanedimethanol, and polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. It is constituted by being done. In addition, diphenylsulfone dicarboxylic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, azelaic acid, and the like can be selected as the other acid components, and the diol component can be neopentyl glycol, diethylene glycol, 1,4-cyclohexane dimethylol, Examples thereof include 2,2-bis (4-β-hydroxyethoxyphenyl) propane and 1,4-bis (β-hydroxyethoxy) benzene.

Further, the thermoplastic polyester resin of the present invention may be a polyester resin comprising a polymer of an oxyacid or a copolymer of an oxyacid, and lactic acid, ε-caprolactone, p-oxybenzoic acid as the oxyacid. , P-β-hydroxyethoxybenzoic acid, and the like.

As typical examples of the thermoplastic polyester resin described above, polyethylene terephthalate resin,
Aromatic polyester resin such as polyethylene naphthalate resin, polyethylene succinate resin, aliphatic polyester resin such as polybutylene succinate resin,
Polymers of oxyacids such as polylactic acid resins and polycaprolactone resins, or polyester elastomers obtained by copolymerizing aromatic polyester resins with polyoxyalkylene glycols can also be used. Further, these polyester resins may be used alone or as a blend, if necessary.

The inorganic UV absorber having an ultraviolet absorbing effect in the polyester resin composition of the present invention includes:
Examples include zinc oxide, titanium oxide, cerium oxide, and iron oxide. However, iron oxide turns slightly red to absorb light in the visible light range.
Since cerium oxide is inferior in ultraviolet absorbing effect to zinc oxide, zinc oxide is preferable as the inorganic ultraviolet absorbing agent. The average primary particle diameter of the inorganic ultraviolet absorber represented by zinc oxide is 10 to 1 in consideration of the blend with the thermoplastic polyester resin and the ultraviolet absorption effect.
Fine particles having a diameter of 00 nm are preferred.

As the resin-based pigment dispersant to be added to the above-mentioned thermoplastic polyester resin, an olefin-based copolymer can be used. As these olefin-based copolymers, a carboxylic acid-modified product of any of polyethylene, polypropylene, and ethylene-propylene copolymer is preferable.
These copolymers may be used alone or as a mixture. Various kinds of carboxylic acids such as monocarboxylic acids such as acrylic acid and methacrylic acid, and dicarboxylic acids such as maleic anhydride and itaconic acid can be used. The amount of modification with these carboxylic acids is not particularly limited, but the acid value (KOHmg /
g) is 20 to 60, and the weight fraction of the copolymer is 1 to 10 wt.
% Is used.

The aforementioned carboxylic acid-modified polyethylene, polypropylene, and ethylene-propylene copolymer are melt-kneaded with a polyester resin and an inorganic ultraviolet absorber, so that the surface of the inorganic ultraviolet absorber reacts with a carboxyl group. In addition, it becomes possible to give the surface treatment effect of the inorganic ultraviolet absorber. In other words, polyethylene, polypropylene, and ethylene-propylene copolymers modified with this carboxylic acid can provide the function of a pigment dispersant and the function of suppressing photocatalytic activity. Even when a high-concentration UV-absorbing agent is blended, the dispersibility is good and a high-concentration inorganic UV-absorbing agent dispersion can be prepared without deterioration of the resin.

The molecular weight of the above-mentioned resin-based pigment dispersant is 500 to 10,000 as measured by a viscosity method. Since the resin-based pigment dispersant of the above-described component has low compatibility with the base polyester resin, a domain of the resin-based pigment dispersant is formed in a matrix of the polyester resin to form a sea-island structure in which the domains of the resin-based pigment dispersant are dispersed. There is a possibility that light is scattered and becomes opaque due to the difference in the refractive index. When a compound having a molecular weight of more than 10,000 is blended, there is a possibility that the resin-based pigment dispersant is dispersed in the polyester resin in a state where the domain is large, and the transparency is impaired. From such a viewpoint, by adding a resin pigment dispersant having a relatively low molecular weight (low viscosity), the dispersion diameter of the domain can be reduced by <1.
μm, and there is no problem that greatly affects the transparency.

The amount of the inorganic ultraviolet absorber added to the polyester resin is 5 to 100 parts by weight of the thermoplastic resin.
~ 50 parts by weight are preferred. If the amount is less than 5 parts by weight, the effect as a high concentration dispersion cannot be exhibited. If the amount is more than 50 parts by weight, the amount of the high-concentration dispersion to be used is very small as compared with the resin used as the base of the molded body when the concentration of the diluted inorganic ultraviolet absorber is reduced to a predetermined amount. This may cause uneven dispersion of the inorganic ultraviolet absorber. On the other hand, if the addition amount is large, the dispersibility of the inorganic ultraviolet absorber is reduced, which affects the transparency of the molded article when subsequently processed into a molded article. There is no problem if the amount of the inorganic ultraviolet absorber added in the inorganic ultraviolet absorbent high-concentration dispersion is 5 to 50 parts by weight, and it can be adjusted according to the concentration of the inorganic ultraviolet absorber as a molded article. It is possible.

The amount of the resin pigment dispersant to be added is determined by the ratio of the amount of the resin pigment dispersant to the amount of the inorganic UV absorber (R = the amount of the resin pigment dispersant / the amount of the inorganic UV absorber) ) Is preferably 0.1 ≦ R ≦ 5. R <0.1
In the case of (when the amount of the resin-based pigment dispersant is small), the dispersibility of the inorganic ultraviolet absorber is reduced, and the transparency of the molded article may be impaired. Further, as described above, since the resin-based pigment dispersant has low compatibility with the base polyester resin, even when R> 5 (when the amount of the pigment dispersant is large), the transparency of the molded article may be impaired. In particular, by setting the range of 0.5 ≦ R ≦ 1, it is possible to obtain a resin composition having a good dispersion state of the inorganic ultraviolet absorber and excellent transparency.

As described above, the dispersion state of the inorganic ultraviolet absorber affects the transparency of the molded article. for that reason,
As for the dispersion state of the inorganic ultraviolet absorber at least in the molded article, the smaller the amount of the inorganic ultraviolet absorber dispersed in the order of μm, the smaller is preferable. If very high transparency is required, the maximum particle size is preferably 400 nm or less. However, the decrease in transparency due to the addition of the inorganic UV absorber is due to the scattering of light by the inorganic UV absorber, and therefore depends on the thickness of the plate actually used for evaluation and the required light transmittance. Thus, it is possible to suppress the amount of the UV absorber added and improve the transparency. However, even in such a case, the maximum particle size of the inorganic ultraviolet absorber dispersed in the resin composition is preferably 5 μm or less, preferably 1 μm or less, and more preferably 500 nm or less.

The ultraviolet absorbing effect of a molded article using the inorganic ultraviolet absorbent high-concentration dispersion of the present invention can be measured by blending the high-concentration dispersion with a polyester resin by a method such as dry blending with a thickness of 2 mm. The light transmittance at the time of molding into a plate was evaluated. At that time, the light transmittance at a wavelength of 700 nm was 75 to 100%, and the wavelength was 360.
light transmittance at 0 nm to 40%, wavelength 300 nm
The following light transmittance is 0 to 10%, and the wavelength is 400 to 700 n.
It is desirable that the light transmittance at m is 50 to 100%. When the light transmittance at a wavelength of 700 nm is 75% or less, transparency is obtained. When the light transmittance at a wavelength of 360 nm is 40% or more, particularly when the light transmittance at a wavelength of 300 nm or less is 10% or more, the ultraviolet absorbing effect is poor. In addition, wavelength 4
If the light transmittance at 00 to 700 nm is 50% or less, the transparency is poor. However, the evaluation method when using the plate having a thickness of 2 mm is not limited, and it is preferable that the ultraviolet absorbing effect and the transparency be maintained regardless of the thickness.

As an index of the transparency, a haze measurement can also be mentioned. However, in the case of the haze measurement, it greatly changes depending on whether the base resin is crystalline or amorphous, but if transparency is required, the haze is preferably 50% or less. Particularly, in the case of a resin having good transparency, such as a polyethylene terephthalate resin, the haze is preferably 30% or less, more preferably 20% or less, and further preferably 10% or less. The evaluation method at this time also uses the above-described plate having a thickness of 2 mm. However, since this method is not a limited method, the ultraviolet absorption effect can be obtained regardless of the thickness.
It is preferable to maintain transparency.

The method for producing the polyester resin composition of the present invention is carried out by melt-kneading the polyester resin described above, a predetermined amount of an inorganic ultraviolet absorber and a resin pigment dispersant. When these compositions are melt-kneaded, various kneaders such as a single-screw extruder, a twin-screw extruder, or a Brabender-type kneader can be used. It is obtained by extruding a molten resin kneaded with these kneaders into a strand shape, cooling by water cooling or air cooling, and then pelletizing. The high-concentration dispersant of the inorganic ultraviolet absorber obtained by such a method is applied to the polyester resin serving as the base of the molded product, and the content of the inorganic ultraviolet absorber in the molded product is based on 100 parts by weight of the base resin. It is blended so as to be 0.01 to 5 parts by weight, and a molded body is obtained by using various molding methods.

Various forms, such as a film, a sheet, a bottle, and a tray, other than the above-described plate can be used for developing the molded body. For films, methods such as inflation and extrusion lamination, for sheets, methods such as extrusion and extrusion lamination, and for bottles, methods such as injection molding, (stretch) blow molding, and injection blow molding In this case, the sheet molded product can be formed by a technique such as vacuum compression molding. Various molded articles can be obtained in addition to these molded articles. These molded products may be added with an additive such as a coloring agent as needed.

[0036]

EXAMPLES Examples of the present invention will be described below, but the technical scope of the present invention is not limited to these examples.

Example 1 Polyethylene terephthalate resin as a thermoplastic polyester resin, zinc oxide having an average primary particle diameter of 20 nm as an inorganic ultraviolet absorber,
A maleic anhydride-modified ethylene-propylene copolymer having a molecular weight of 1600 was used as a resin-based pigment dispersant.
At this time, the addition amount of zinc oxide was set to 20 parts by weight, and the ratio R of the addition amount of the resin-based pigment dispersant and zinc oxide was set to R = 0.8. This mixture of the ultraviolet absorber and the pigment dispersant was added to the polyethylene terephthalate resin in a molten state. A twin screw extruder was used for these kneading. At this time, the polyethylene terephthalate could be stably kneaded without receiving the photocatalytic activity of zinc oxide (without deterioration). The molten resin extruded by the twin-screw extruder was cooled with water, pelletized, and dried to prepare a high-concentration dispersion of an inorganic ultraviolet absorbent. This high-concentration dispersion of the inorganic ultraviolet absorbent is similarly mixed with a polyethylene terephthalate resin, dried, and then subjected to injection molding to form a 1 mm-thick 2 mm thick resin.
A molded body (plate) of 00 mm x 100 mm was prepared. At this time, the concentration of zinc oxide contained in the compact was 0.5
It was adjusted to be parts by weight. The light transmittance of this plate was evaluated by a spectrophotometer, and the transparency was evaluated by comparison with a haze meter and a visual blank. Table 1 shows the results.

Example 2 The concentration of zinc oxide in the high-concentration dispersion of inorganic ultraviolet absorber was 10 parts by weight, R = 1, and the zinc oxide content of the molded article was 0.8 parts by weight. Other than the above, it is the same as Example 1.

Example 3 Example 1 was repeated except that a copolyester resin obtained by copolymerizing polyethylene terephthalate resin with 1,4-cyclohexanedimethanol (indicated as copolyester in the table) was used as the thermoplastic polyester resin. Is the same.

Example 4 The same as Example 1 except that a polyethylene naphthalate resin was used as the thermoplastic polyester resin.

Example 5 The same as Example 1 except that polylactic acid which is a polymer of oxyacid was used as the thermoplastic polyester resin.

Example 6 A molded article (bottle) having an average thickness of 0.8 mm was formed by injection / stretch blow molding using a high concentration dispersion of an inorganic ultraviolet absorbent having the structure shown in Example 1. This is the same as the first embodiment.

Example 7 Example 7 was the same as Example 6 except that the inorganic ultraviolet absorbent high-concentration dispersion having the structure shown in Example 3 was used.

Example 8 Example 8 was the same as Example 6 except that a high-concentration dispersion of an inorganic ultraviolet absorbent having the structure shown in Example 4 was used.

Example 9 Example 9 was the same as Example 6 except that the inorganic ultraviolet absorbent high concentration dispersion having the structure shown in Example 5 was used.

<Comparative Example 1> The same as Example 1 except that no dispersant was used.

Comparative Example 2 Example 1 was the same as Example 1 except that a metal soap (calcium stearate) was used as a dispersant.

Comparative Example 3 Low molecular weight ethylene-propylene copolymer wax (molecular weight: 400
This example is the same as Example 1 except that 0) was set.

Comparative Example 4 The same as Example 1 except that the amount of zinc oxide in the zinc oxide high concentration dispersion was changed to 70 parts by weight.

[0050]

[Table 1]

The following can be said from these results. By adding a high concentration of an inorganic UV absorber to various polyester resins and using a carboxylic acid-modified olefin copolymer as a resin-based pigment dispersant, the photocatalytic activity of zinc oxide is suppressed and the inorganic UV absorber is absorbed. It is possible to obtain a high-concentration dispersion in which zinc oxide, which is an inorganic ultraviolet absorber, is dispersed at a high concentration without lowering the processability of the high-concentration dispersion. Further, the molded article obtained by using the inorganic ultraviolet absorbent high concentration dispersion, by adjusting the amount of zinc oxide contained in the molded article, its moldability, molding efficiency, transparency, ultraviolet light It can be seen that it has a characteristic excellent in the absorption effect and the stability of the effect.

Further, as shown in Comparative Examples 1 to 3, when the kind of the dispersant is changed, it is also found that the polyester resin is remarkably deteriorated due to the photocatalytic activity of zinc oxide, and processing becomes impossible. Further, in Comparative Example 4, it can be seen that the amount of zinc oxide dispersed in the high-concentration dispersion is extremely large, so that the dispersion state is reduced and the transparency of the molded body is affected. In this case, zinc oxide was used in consideration of the transparency, the presence or absence of coloring, and the ultraviolet absorption effect. No problem.

[0053]

EFFECTS OF THE INVENTION The high-concentration dispersion of the inorganic ultraviolet absorbent of the present invention and the molded article using the same have been conventionally used in the field of organic ultraviolet absorption which are problematic in terms of coloring, hygiene, durability of the ultraviolet absorption effect, and heat resistance. As a substitute for the agent, the molded article does not impair the inherent transparency of the resin. Further, depending on the base material or molding method, it is possible to develop not only bottles and plates, but also transparent ultraviolet absorbing films, laminates thereof, trays, and the like.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) C08L 23:28) F-term (reference) 4F100 AA00A AA21A AA25A AK04A AK07A AK41A AK64A AL01A AL07A BA01 CA07A CA13A GB16 JA07A JB16A JD JJ03 4J002 BB212 BN052 BN062 CF031 CF041 CF051 CF081 CF181 CF191 DE106 DE136 FD056

Claims (7)

[Claims] 1. An inorganic ultraviolet absorber having an ultraviolet absorption effect is added to 100 parts by weight of a thermoplastic polyester resin.
-50 parts by weight, and the molecular weight in the viscosity method is 500-1.
The resin-based pigment dispersant of 0000 is 0.1 ≦ R ≦ at a ratio R (R = added amount of resin-based pigment dispersant / added amount of inorganic-based ultraviolet absorber) of the resin-based pigment dispersant and the inorganic ultraviolet absorber. 5. A high-concentration dispersion of an inorganic ultraviolet absorber, which is a polyester resin composition compounded to be 5. 2. The high-concentration inorganic ultraviolet absorbent dispersion according to claim 1, wherein the resin-based pigment dispersant is a carboxylic acid-modified product of polyethylene, polypropylene, or ethylene-propylene copolymer. body. 3. The inorganic ultraviolet absorbent according to claim 1, wherein the inorganic ultraviolet absorbent having an ultraviolet absorbing effect is one of zinc oxide and titanium oxide, or a mixture thereof. Concentration dispersion. 4. The thermoplastic polyester resin according to claim 1, wherein the acid component of the thermoplastic polyester resin is terephthalic acid, isophthalic acid,
A high-concentration dispersion of an inorganic ultraviolet absorbent, which is selected from at least one of naphthalene 2,6 dicarboxylic acid, succinic acid, adipic acid, succinic acid, and sebacic acid. 5. The thermoplastic polyester resin according to claim 1, wherein the diol component of the thermoplastic polyester resin is ethylene glycol,
Propylene glycol, butylene glycol, 1,4-
A high concentration dispersion of an inorganic ultraviolet absorbent, wherein the dispersion is selected from at least one of glycols such as cyclohexanedimethanol and polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol and polytetramethylene glycol. 6. An inorganic ultraviolet absorbent high concentration dispersion according to claim 1, wherein the thermoplastic polyester resin comprises a polymer of an oxyacid or a copolymer of an oxyacid. 7. A high-concentration inorganic ultraviolet absorbent dispersion according to any one of claims 1 to 6 is blended with a resin as a base of a molded article to dilute the dispersion amount of the inorganic ultraviolet absorber,
A molded article characterized by being molded from the diluted polyester composition.