JP2000318107A - Transparent composite resin laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent composite resin laminate obtained by laminating a base layer and surface layer by a coextrusion molding method, having proper thermoformability, keeping combustion resistance and impact resistance sufficiently, excellent in weatherability, having good lamination properties and high see-through and stable in appearance quality as a whole. SOLUTION: A base layer comprises a resin compsn. containing a polyester resin obtained by the polycondensation of a polycarbonate resin and/or a dicarboxylic acid type polycondensation component and a glycol type condensation component and a surface layer comprises a resin compsn. containing 3-25 pts.wt. of an ultraviolet absorber and 0.05-1 pts.wt. of one or more kind of a lubricant selected from ester type, fatty acid type and alcohol type lubricants per 100 pts.wt. of a polycarbonate resin with a mean mol.wt. of 15,000-23,000. The base layer and the surface layer are laminated and integrated by a coextrusion molding method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent multilayer resin laminate excellent in transparency and used mainly for outdoor applications.

[0002]

2. Description of the Related Art Generally, a signboard or the like which requires backside printing and which is used outdoors has a thickness of about 1 mm to several mm depending on its size. Not only excels in secondary workability such as cutting and thermoforming, impact resistance during use, combustion resistance, and weather resistance, but also allows the display sample to be viewed as it is. It is required to be excellent.

Conventionally, for this type of application, a plate made of an impact-resistant acrylic resin having excellent transparency and weather resistance as well as secondary workability has been frequently used. However, there is a problem that the essential requirements for this kind of application are still not sufficiently satisfied.

On the other hand, recently, a plate-shaped body made of a transparent polycarbonate resin has been known for its excellent heat resistance,
It is partly used for this kind of applications in terms of combustion resistance and impact resistance.

[0005]

However, when a polycarbonate resin is used, there is a problem that a molding cycle is lengthened due to a high suitable temperature of thermoforming of the resin, and furthermore, usually a plate-like body is not used. When the thermoforming is performed while leaving the masking film for scratch prevention coated on the surface as it is, since the film is melted and thermoforming becomes difficult, it is unavoidable to thermoform in a state where it is removed, Thereafter, as a result of handling in that state, scratches often occurred on the surface of the face plate.

[0006] In general, a polycarbonate resin material is excellent in heat resistance, impact resistance, combustion resistance and the like, but has a property of causing a color change to yellow when exposed to ultraviolet rays or the like. The known means include, first, means for mixing an ultraviolet absorber into a material at the time of plate-like molding,
Secondly, there is adopted a method of coating a surface layer made of a thin layer such as an acrylic resin film having excellent weather resistance on a surface of a base layer occupying most of the thickness of the plate-like body by a lamination method.

[0007] However, in the first means, an ultraviolet absorber is mixed into the material and dispersed throughout the plate-like layer.
The UV absorber cannot exert its effect as it separates from the practical surface, and it is not only a wasteful cause and a cause of high cost, but also the initial coloring by the UV absorber,
There is a problem of discoloration due to bleeding phenomenon or thermal deterioration at the time of thermoforming due to a high suitable processing temperature of the polycarbonate resin itself. In the second means, the polycarbonate resin plate of the base layer and the acrylic resin film of the surface layer are discolored. Due to the inclusion of contaminants at the lamination interface, differences in optical characteristics such as the refractive index between the base layer and the surface layer, and differences in flatness and smoothness of the lamination interface, distortion of the perspective image and haze due to cloudiness occur at the lamination interface. In addition, there is a problem that the manufacturing process is complicated, and it is difficult to easily apply the method to a face plate application, and the present situation is that the problem has not yet been sufficiently solved.

As a solution to the problem by the first means, the present inventors have proposed that a polycarbonate resin be provided with an ultraviolet absorber comprising a triazine compound and, in addition, one of a coumarin compound and a naphthalimide compound. Alternatively, it has been proposed to add two types of fluorescent whitening agents (Japanese Patent Laid-Open No. 10-176103). By this means, the weather resistance of the polycarbonate resin composition is certainly improved, but since the ultraviolet absorber and the like are uniformly contained in a single layer as a whole, the above-mentioned various means by the conventional first means are used. Has not been solved yet.

Therefore, as a means for solving the above-mentioned problem, a well-known surface concentration method in which both the base layer and the surface layer are made of the same polycarbonate resin composition, and the ultraviolet absorbent is intensively mixed into the surface layer. Although it is possible to adopt a method of adding and laminating by adopting a conventionally known co-extrusion molding method, which is used for the production of a multilayer product made of a thermoplastic resin, it is conceivable that the base layer and the surface layer are actually It is difficult to adjust the extrusion conditions due to the difference in the flow state of the molten resin per unit cross-sectional area of the flow path in the die corresponding to the thickness, and the co-extrusion molding method is used in which the basic resin composition of both layers is the same Extrusion of this type of laminate is very difficult. Moreover, with such a means, among the problems in the thermoforming described above, distortion of the perspective image and haze due to cloudiness are removed,
Other problems attributable to the properties of the polycarbonate resin cannot be solved. Under such circumstances, the present inventors have further improved and proposed the following transparent multilayer resin laminate (Japanese Patent Application No. 11-41413). That is,
The base layer portion is a resin composition containing a polyester resin obtained by polycondensing a polycarbonate resin and / or a dicarboxylic acid-based polycondensation component and a glycol-based condensation component, and the surface layer portion is a polycarbonate having an average molecular weight in the range of 15,000 to 23,000. A resin composition containing 3 to 25 parts by weight of an ultraviolet absorber with respect to 100 parts by weight of a resin, and both layers are laminated and integrated by a coextrusion molding method.

[0010] According to the above-mentioned proposal, while having appropriate thermoformability, sufficiently maintaining flame resistance and impact resistance, and having excellent weather resistance, good lamination properties and no distortion in the perspective image, Although it is possible to obtain a transparent multilayer resin laminate having high transparency without cloudiness, during the extrusion operation by the co-extrusion molding method, due to blooming of the ultraviolet absorber contained in the surface layer portion, the ultraviolet absorber gradually decreases. Attached to the surface of the polishing roll, it becomes visible approximately 30 minutes after the start of the extrusion operation, and further accumulates over time and is transferred to the surface of the laminate, thus impairing the appearance quality. I found it to be.

Usually, this type of deposit on the polishing roll due to blooming of the additive of the resin composition during the extrusion is wiped periodically or by setting the cooling temperature of the polishing roll to a higher temperature. These methods are used to reduce the degree of adhesion.However, in the former case, the interval between operations is only a little longer, and in the latter case, the molten material adheres to the surface of the polishing roll. There is a problem that can not be.

[0012]

Under the above-mentioned technical background, the present inventors have further studied for improvement, and have basically formed a base layer that occupies most of the thickness of the laminate. The resin composition to be replaced is replaced with a resin composition composed of a polycarbonate resin and / or a polyester resin composed of a specific component, and the resin composition constituting the surface layer is composed of a polycarbonate resin having a specific range of average molecular weight containing an ultraviolet absorber. Utilizing the previous proposal as a resin composition, and further adding a specific lubricant to the resin composition constituting the surface layer, the base layer and the surface layer can be easily laminated using a conventionally known co-extrusion molding method. Not only is it possible to obtain a laminated body having excellent weather resistance and high transparency while having moderate secondary workability, as well as transfer of an ultraviolet absorber due to blooming. Appearance quality and completed the present invention found that it is possible to obtain stable transparent multilayered resin laminate.

According to the present invention, the base layer and the surface layer are laminated by a co-extrusion molding method, have an appropriate thermoformability, sufficiently maintain the combustion resistance and the impact resistance, and have the weather resistance. An object of the present invention is to provide a transparent composite resin laminate having excellent transparency, good lamination properties, high transparency, and stable overall appearance quality.

That is, the present invention provides a transparent multilayer resin laminate in which a base layer and a surface layer are laminated and integrated by a co-extrusion molding method, wherein the base layer comprises a polycarbonate resin and / or a dicarboxylic acid-based resin. A polyester resin obtained by polycondensing a polycondensation component and a glycol-based condensation component, wherein the surface layer has an average molecular weight of 15,000.
Polycarbonate resin 100 in the range of ~ 23,000
3 parts by weight to 25 parts by weight of an ultraviolet absorber and 0.05 to 1 part by weight of one or two or more kinds of lubricants selected from ester, fatty acid and alcohol based lubricants. The gist of the present invention is a transparent multilayer resin laminate characterized by comprising a resin composition containing the same.

A preferred embodiment of the present invention is the transparent multilayer resin laminate according to claim 1, wherein the ultraviolet absorber comprises a triazine compound.

Another preferred embodiment of the present invention is the transparent multilayer resin laminate according to claim 1 or 2, wherein the surface layer has a thickness of 10 μm to 300 μm.

According to the present invention, the specific polyester resin obtained by polycondensing the base layer portion with a polycarbonate resin and / or a terephthalic acid-based component and a glycol-based condensation component is used as a resin composition. A transparent multilayer resin laminate having suitable secondary workability and heat resistance and having excellent transparency can be obtained.

Further, the transparent multilayer resin laminate of the present invention comprises:
Since the surface layer has a resin composition in which a specific triazine-based compound and an ultraviolet absorber and a specific lubricant are added to a single resin component of a polycarbonate resin having a specific molecular weight range, the fluidity at the time of co-extrusion molding is increased and the base layer is formed. The fluidity balance and the laminating property of each other are improved, and the perspective image is not distorted at the laminating interface or the haze due to cloudiness does not occur, and the transparency is improved. The appearance of the laminate as a whole can be prevented from being initially colored by the absorber or discolored due to thermal deterioration, and blooming of the ultraviolet absorber is suppressed, so that the appearance quality of the laminate is stabilized. At the same time, the work of wiping off the deposits on the polishing roll in the plate making process is reduced.

Further, the transparent multilayer resin laminate of the present invention has a surface layer thickness of 10 μm to 300 μm, which is thin with respect to a base layer thickness of 1 mm to several mm. Next workability will be dominated by the base layer,
It is not hindered by the surface layer.

Therefore, the transparent composite resin laminate according to the present invention has not only excellent flame resistance and transparency but also moderate thermoformability due to the resin component used. A transparent composite resin laminate having excellent weather resistance, good lamination properties, no distortion in the perspective image, no cloudiness and high transparency, and a stable overall appearance quality can be obtained.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the transparent composite resin laminate according to the present invention will be described together with examples and comparative examples. In addition, the said laminated body in this invention shall include what laminated | stacked and integrated the surface layer part not only on one side of the base layer part but on both surfaces.

In the present invention, the resins used for the base layer and the surface layer of the transparent composite resin laminate include both cases where they are substantially the same as each other and cases where they are different from each other. In this case, the resin substantially the same as the resin in the surface layer refers to a polycarbonate resin, and a foreign resin is obtained by polycondensing a terephthalic acid-based component and a glycol-based condensation component. Refers to a polyester resin with good compatibility.

For the base layer, a polycarbonate resin or a polyester resin may be used alone, or both resins may be used by mixing at a certain ratio.
The criteria for the selection are determined based on the secondary workability, heat resistance, and impact resistance required for the product to be used, such as the face plate, to which the laminate is applied. For example, a product for outdoor use is required to have a heat deformation temperature of about 90 ° C. or more from the viewpoint of heat resistance, and it is preferable that the temperature be less than about 120 ° C. from the viewpoint of thermoformability among secondary workability. ,
It is not necessarily limited to this. For applications that do not require secondary processing by thermoforming such as bending and vacuum forming, the thermal deformation temperature may be 120 ° C. or higher, and even for applications for outdoor use, the environmental temperature For low-use products, those having a heat distortion temperature of 70 ° C. or less may be used.

As the polycarbonate resin used for the base layer portion, for example, a resin produced by a known method from a bisphenol compound can be used, and various types may be used in combination. It is widely used for plate-like products and has an average molecular weight of 20000
The one in the range of 30,000 is used. Exceeding this range will result in poor extrusion moldability, and below this range will result in reduced impact resistance.
A range of 000 is suitable. In a use product requiring high heat resistance, the resin is used alone and its heat deformation temperature is approximately 135 ° C.

The polyester resin used for the base layer is obtained by polycondensing a carboxylic acid-based polycondensation component and a glycol-based condensation component, and generally has good compatibility with the polycarbonate resin. This is known, and is disclosed, for example, in JP-A-53-94536 and JP-A-53-94538.

In the present invention, as the polyester resin, for example, a dicarboxylic acid-based polycondensation component composed of one or more terephthalic acid-based components selected from the group consisting of terephthalic acid and terephthalic acid derivatives,
40 mol% of 1,4-cyclohexanedimethanol
The following general formula (I) obtained by polycondensing a glycol-based polycondensation component containing 0 mol%;

Embedded image Polyester resin having a repeating unit represented by in the structure is preferable, and the compatibility with the polycarbonate resin is good, so that the heat resistance of the base layer portion can be arbitrarily adjusted when both resins are mixed and used. , And the light refractive index approximates to maintain high transparency.

The polyester resin has a heat deformation temperature of about 70.degree. C. and is a product for which heat resistance is required to be low in consideration of thermoformability. This is used alone as a resin composition.

Accordingly, the transparent composite resin laminate of the present invention exhibits the highest heat resistance when the polycarbonate resin is used alone, and exhibits the lowest heat resistance when the polyester resin is used alone. . When the two resins are mixed and used, the temperature is 70 ° C. to 13 ° C.
Within the range of 5 ° C., the heat distortion temperature according to the mixing ratio can be set.

Next, the surface layer is limited to a polycarbonate resin. For example, a surface layer produced from a bisphenol compound by a known method is used, and various types may be used in combination. The average molecular weight is in the range of 15,000 to 23,000.

In this case, if the average molecular weight of the polycarbonate resin is less than 15,000, the weather resistance of the surface may be reduced and the yellow color may be changed when the application product of the transparent multilayer resin laminate is used outdoors. If it exceeds 23000, the fluidity during co-extrusion molding is deteriorated, the flatness and smoothness of the lamination interface in the die are lost, and there is a risk that the perspective image is distorted at the lamination interface or haze is caused by cloudiness, which is not preferable. Therefore, the average molecular weight of the polycarbonate resin,
Preferably, it is in the range of 18,000 to 20,000.

The thickness of the surface layer is about 1 mm to several mm, whereas the thickness of the base layer is usually about 1 mm to several mm.
10 μm to 300 μm. The thickness of the surface layer is set according to the usage environment of the application product. The thickness is set thicker in an environment exposed to the sun and requiring a large absolute amount of the ultraviolet absorber, and thinner in the opposite environment. The flowability in the die in the extrusion molding decreases and the lamination with the base layer becomes difficult, and if it exceeds 300 μm, the absolute amount of the ultraviolet absorber increases, but the ultraviolet absorber in the portion separated from the surface is Since the effect cannot be exhibited effectively and it is useless, it is preferably in the range of 15 μm to 270 μm.

The UV absorber added to the surface layer portion is
Generally known compounds can be applied, and among them, triazine compounds are preferred. The content is 3 to 25 parts by weight with respect to 100 parts by weight of the polycarbonate resin, and is set within the above range according to the use environment of the above-mentioned application product. In this case, if it is less than the above range, the weather resistance cannot be sufficiently exhibited, and if it exceeds the above range,
A further effect cannot be expected, but rather causes undesired initial coloring and bleeding. Therefore, it is preferably 5 to 20 parts by weight based on 100 parts by weight of the polycarbonate resin.

The lubricant added to the surface layer is one or more lubricants selected from fatty acid-based, ester-based and alcohol-based lubricants. Specifically, glycerin monopalmitate, glycerin monostearate, glycerin monooleate, glycerin monolinolate, glycerin monobehenate, glycerin mono 12-hydroxystearate, glycerin monocaprylate, glycerin monolaurate as ester lubricants Glycerin dipalmitate, glycerin distearate, glycerindiolate, glycerin dilinoleate, glycerin dibehenate, glycerin dilysylate, glycerin di 12-hydroxystearate, glycerin tristearate, glycerin triolate, glycerin tri 12- Hydroxystearate, etc. and stearyl stearate, butyl stearate, lignoceric acid minisyl alcohol ester, stearin as fatty acid lubricant , And 12-hydroxystearic acid, stearyl alcohol, cetyl alcohol, and the like Further, as the alcohol-based lubricants.

The amount of the lubricant to be added is as follows.
0.05 to 1 part by weight based on 00 parts by weight. In this case, if the amount is less than 0.05 part by weight, there is no effect of preventing the ultraviolet absorbent from adhering to the polishing roll, and if it exceeds 1 part by weight, no further effect of preventing the adhesion is seen. And the foaming phenomenon occurs in the surface layer portion of the obtained laminate, which is not good. Therefore, it is desirably 0.1 to 0.5 parts by weight.

In order to further improve the weather resistance, the polycarbonate resin composition constituting the surface layer portion may further include, in addition to the triazine-based compound as the ultraviolet absorber, a fluorescent bleach comprising, for example, a coumarin compound or a naphthalimide compound. An agent can be appropriately added.

The resin composition constituting the base layer and the surface layer according to the present invention contains, in addition to the ultraviolet absorber and the lubricant, an antioxidant, a plasticizer, a modifier, a light stabilizer, an antistatic agent, and the like. Various additives such as agents can be appropriately added without departing from the purpose of the present invention.

Next, in the present invention, the coextrusion molding method applied to the extrusion molding of the transparent composite resin laminate includes a known coextrusion molding method usually used for producing a multilayer laminate made of a thermoplastic resin. It is finished into a plate-shaped laminate by a device equipped with a flat T-die and a polishing roll having a mirror-finished surface.

In this case, the T-die system is preferably a feed block system in which a resin composition in a heated and molten state is laminated before flowing into the T-die, or a multi-manifold system in which a resin material is laminated inside the T-die. it can. Note that T
The dual slot method in which the layers are stacked immediately after the die flows out is excluded from the present invention because the bonding between the layers is inferior and the transparency of the stacked interface is impaired.

As described above, the present invention provides a transparent multilayer resin obtained by laminating and integrating a base layer made of each resin composition and a surface layer in a hot melt state in a die by a known coextrusion molding method. It is a laminate. The obtained laminate is used in a flat state when it is applied to a product for use, and is further processed into, for example, a curved surface or a spherical surface by thermoforming or the like, and is used as a face plate or the like of a vending machine.

The transparent multilayer resin laminate of the present invention has a surface layer in which a specific ultraviolet absorber and a specific lubricant are intensively contained in a polycarbonate resin having a specific average molecular weight range on the surface. As a result, the adhesion of the ultraviolet absorbent to the polishing roll surface due to blooming during plate making is suppressed, so that the surface of the laminate is not contaminated and the stable appearance quality is maintained, and the yellowness (initial transmission color tone) is maintained.
Even when used as a face plate or the like in a state exposed to the scorching sun in summer, the degree of yellowing accompanying deterioration of weather resistance is small.

Also, the transparent multilayer resin laminate of the present invention
The base layer, which is dominant in secondary workability, especially thermoformability, is made of a resin composition composed of polycarbonate resin and / or a specific polyester resin, so that it has excellent thermoformability and heat resistance adapted to the use environment. And maintain high transparency. In addition, since the compatibility between the two resins is good, excellent lamination properties and impact resistance can be secured, and the flatness and smoothness of the lamination interface between the base layer and the surface layer are uniformed, and the transparency is improved. Very good.

[0042]

Hereinafter, examples of the present invention will be described together with comparative examples.

First, for the examples, the components used in the base layer and the surface layer and their amounts are shown below.

-Base layer part-Polycarbonate resin 40 parts by weight (average molecular weight 27000) Polyester resin 60 parts by weight (Ratio of dicarboxylic acid component having a terephthalic acid ratio of 99 mol% or more and 1,4-cyclohexanedimethanol) Is 50 mol% with a glycol-based component /
Eastman Chemical Co., Ltd. "PCTG 5445")-Surface layer--Polycarbonate resin 100 parts by weight (average molecular weight 19000)-Ultraviolet absorber Amount shown in Table 1 (Triazine-based compound / Ciba Geigy Co., Ltd.-Tinuvin 1
577 ") ・ Lubricant Ingredients and amounts shown in Table 1 (glycerin monostearate /“ S ”manufactured by Riken Vitamin Co., Ltd.)
-100A ", glycerin monostearate / distearate mixture /" S-200 "manufactured by Riken Vitamin Co., Ltd., stearyl stearate /" SL-90 "manufactured by Riken Vitamin Co.
0 ", stearic acid /" VL manufactured by Kawaken Fine Chemical Co., Ltd.
Z-200 ", stearyl alcohol /" VLTN-6 "manufactured by Kawaken Fine Chemical Co., Ltd.) Examples 1 to 9 For each of the examples, the components of the resin compositions of the base layer and the surface layer prepared above were used to absorb ultraviolet light. The amounts of the agent and the lubricant were varied as shown in Table 1, and a mixture for each example was blended.

[0045]

[Table 1]

Then, using each of the above mixtures, a base layer portion was formed by a vent-type extruder having an inner diameter of 90 mm.
After the surface layer is melt-kneaded by a 0 mm vent type extruder, both layers are extruded through a feed block type T-die, and a 3.0 mm thick base layer and a thickness are formed on one side in a die. A transparent multilayer resin laminate having a 30 μm surface layer laminated thereon was obtained.

For each of the transparent multilayer resin laminates obtained in Examples 1 to 9, the state of adhesion of the ultraviolet absorbent to the polishing roll during extrusion molding was visually observed, and three hours after the start of the extrusion operation. The adhesion preventing performance of the ultraviolet absorbent was evaluated based on the adhesion state.

Further, according to JIS K7103, the initial coloring degree (yellow degree) and the yellow degree (yellowing degree [ΔYI]) after exposure for 3000 hours were measured by a weather resistance promotion test using a sunshine weatherometer, and the obtained results were further obtained. The transparent multilayer resin laminate was evaluated for the transparency by observing the presence or absence of a distortion of a transparent image of a lamination interface, a cloudy haze, and the like by a fluoroscopic observation. Furthermore, for the laminate, measurement of impact resistance and measurement of heat distortion temperature by a drop weight test (JISK)
7207 / 18.5 MPa).

Regarding the criteria of the above-mentioned respective evaluations, first, the performance of preventing the adhesion of the ultraviolet absorbent to the polishing roll was evaluated as "none" when no adhesion of the ultraviolet absorbent to the polishing roll was observed, and there was a case where it was observed. Regarding the degree of yellowing and the degree of yellowing, both of them were less than 3.0 as good, and more than 3.0 as bad. Also, regarding the evaluation of transparency,
A sample in which no distortion of the perspective image or cloudy haze was recognized was regarded as good, and a sample in which it was recognized was regarded as defective. These evaluation results are shown in Table 1 together with the measurement results of the impact resistance.

Comparative Examples 1 to 4 Comparative Examples 1 and 2 were prepared using a lubricant not belonging to the lubricant used in the present invention, stearic acid amide (manufactured by Kawaken Fine Chemical Co., Ltd./“Amide-6S ”) or ethylene glycol (general). Comparative Example 3 and Comparative Example 4 were the same as those of the lubricant used in the present invention except that glycerin monostearate was added in the amount also shown in Table 1. Laminates were obtained using the same components as in Examples 1 to 9 and by the same method, and the same evaluation was performed. The results are shown in Table 1.

As is evident from the evaluation results in Table 1, the transparent multilayer resin laminate of the present invention did not show any adhesion of the ultraviolet absorbent to the polishing roll during the production of the laminate, and as a result, the surface of the laminate did not absorb the ultraviolet absorbent. The appearance quality was stable without being contaminated by the adhesion of the agent. In addition, the initial yellowness is small, the degree of yellowing with time is small, and the weatherability is high, and there is no distortion of the perspective image of the laminate interface, no haze due to cloudiness, and excellent transparency. there were. Further, the heat deformation temperature was 90 ° C., which was a practically usable range, and it was not broken by the falling weight test, and the impact resistance was sufficiently practical.

On the other hand, in Comparative Examples 1 to 3,
The ultraviolet absorbent adheres to the polishing roll, and the ultraviolet absorbent is transferred to the surface of the laminate, and the adhesion preventing effect of the ultraviolet absorbent is not recognized.
The yellowing degree was also poor, and a foaming phenomenon was observed in the surface layer, and the visibility was poor. Further, in Comparative Example 4, as in the Example, no adhesion of the ultraviolet absorbent to the polishing roll was observed at the time of plate making, but a foaming phenomenon was observed in the surface layer portion, and the transparency was poor.

[0053]

As described above, the transparent multilayer resin laminate of the present invention contains a polycarbonate resin and / or a polyester resin obtained by polycondensing a dicarboxylic acid-based polycondensation component with a glycol-based condensation component. A base layer made of a resin composition, and having an average molecular weight of 15,000 to 23,000
3 to 25 parts by weight of an ultraviolet absorber and one or two or more lubricants selected from ester-based, fatty acid-based and alcohol-based lubricants with respect to 100 parts by weight of the polycarbonate resin in the range of 0.1 to 2.0. Since the transparent multilayer resin laminate is formed by laminating a surface layer portion composed of a resin composition containing 0.05 to 1 part by weight in a hot melt state in a die by coextrusion molding, excellent flame resistance is obtained. It has excellent transparency and transparency, excellent weather resistance, good laminability, high transparency without causing distortion in the perspective image and no cloudiness. Since the contained ultraviolet absorber can be suppressed from adhering to the surface of the polishing roll, the laminate is not contaminated by transfer of the ultraviolet absorber deposited over time on the surface of the polishing roll, So There is an effect that the appearance quality with high transparency is stably secured without being impaired, and furthermore, the resin composition of the base layer can be changed according to the application, so the adjustment of the secondary workability, especially the appropriate There is an effect that thermoformability can be appropriately adjusted.

The surface layer has an average molecular weight of 15,000 to
As a resin composition containing 3 to 25 parts by weight of an ultraviolet absorber composed of a triazine compound with respect to 100 parts by weight of a polycarbonate resin in the range of 23,000, the ultraviolet absorber was intensively added to the surface layer part. There is little yellowing due to initial coloring due to the ultraviolet absorber, and there is an effect that the ultraviolet absorber effectively functions without waste and yellowing due to deterioration of weather resistance is reduced, and the cost is reduced. .

Further, the thickness of the surface layer is adjusted with respect to the base layer.
Because it was laminated very thinly from 10 μm to 300 μm,
There is an advantage that properties such as heat resistance, thermoformability and impact resistance can be appropriately set according to the application without impairing the transparency, transparency and weather resistance of the transparent multilayer resin laminate at all.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C08K 5:05 5:09 5:10 5: 3492) (C08L 69/00 67:02) F-term (Reference) 4F100 AH03H AK41A AK42 AK42K AK45A AK45B AL05A BA02 BA15 CA07B CA19B EH20 GB90 JA07B JJ07 JK09 JL01 JL09 JN01 YY00B 4F207 AA24 AA28 AB19 AG01 AG03 AH43 AR12 KA01 KB26KF02 EGF CFK

Claims (3)

[Claims] 1. A transparent multilayer resin laminate in which a base layer portion and a surface layer portion are laminated and integrated by a co-extrusion molding method, wherein the base layer portion comprises a polycarbonate resin and / or a dicarboxylic acid-based polycondensation component. A resin composition containing a polyester resin obtained by polycondensation with a glycol-based condensation component, wherein the surface layer portion has an average molecular weight of 15,000 to 23,000 with respect to 100 parts by weight of a polycarbonate resin.
3 parts by weight to 25 parts by weight of an ultraviolet absorber, an ester type,
A transparent multilayer resin laminate comprising a resin composition containing 0.05 to 1 part by weight of one or more lubricants selected from fatty acid-based and alcohol-based lubricants. 2. The transparent multilayer resin laminate according to claim 1, wherein the ultraviolet absorber comprises a triazine-based compound. 3. The thickness of the surface layer is 10 μm to 300 μm.
3. The transparent multilayer resin laminate according to claim 1, wherein m is m.