JPH11198331A - Extruded polycarbonate resin / film laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a laminate excellent in antistatic properties and conductivity by a method wherein the laminate has a multilayer structure of a polycarbonate resin extrusion foam and a polycarbonate resin film. SOLUTION: A polycarbonate resin extrusion foam and a polycarbonate resin film, which is laminatingly bonded to some part of the surface of the polycarbonate resin extrusion foam, composes a polycarbonate resin extrusion foam/polycarbonate resin film laminate having the value of the surface specific resistance of the film of 5×10<13> Ω or less. As the concrete laminatingly bonding method of the film to the foam, a method, in which a polycarbonate resin added with the predetermined amount of antistatic agent or conductivity-imparting agent is used as a base material resin, which is formed into a functional film by an inflation method so as to laminatingly bonding the resultant film to the foam with a heated roll, or the like is employed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polycarbonate resin extruded foam / film laminate,
More specifically, the present invention relates to a polycarbonate resin extruded foam / film laminate excellent in antistatic properties and conductivity.

[0002]

2. Description of the Related Art Polycarbonate resin foams have high heat resistance, aging resistance, water resistance, etc., and good electrical and mechanical properties.
It is expected to be used for packaging materials and various containers. Further, it is particularly promising as a container material for a microwave oven or a retort food requiring heat resistance. In the case of a polycarbonate resin foam, there are many advantages as described above. However, since the flow starting point of the polycarbonate resin is significantly higher than that of polystyrene or the like, the melt viscosity is low, and the elongation of the heating sheet is small, so that ordinary extrusion foaming is performed. It is difficult to obtain the desired foam by the method.

Accordingly, the present inventors have previously proposed a polycarbonate resin extruded foam having specific cells obtained by melt-kneading a polycarbonate resin and a foaming agent, and further laminated a polycarbonate resin sheet on the surface of the foam. By applying the method, the inventors found that the heat formability was improved, and filed an application (Japanese Patent Laid-Open No. 8-174780). Incidentally, the extruded polycarbonate resin foam has a surface specific resistance of 1
× 10 ¹⁶ Ω, which has the property of easily charging static electricity. In recent years, as the field of application of polycarbonate resin extruded foam has expanded, depending on the application, electrostatic charging of the foam has become a major problem, and the need to impart antistatic performance and conductive performance to the foam has arisen. I have. However, for imparting antistatic performance and conductive performance to the extruded polycarbonate resin foam, the extrusion temperature of the polycarbonate resin is around 200 ° C., which is higher than the extrusion temperature of general-purpose resin foams such as polystyrene and polyolefin. Degradation of the antistatic agent due to degradation of the function, addition of the antistatic agent and the like, degradation of physical properties due to decomposition of the polycarbonate resin, addition of the antistatic agent and the conductivity-imparting agent to foamability, and secondary processing such as thermoforming. There are problems such as adverse effects, manifestation of the antistatic performance of the obtained foam, and manifestation and sustainability of the conductive performance, and a polycarbonate resin extruded foam having good antistatic performance and conductive performance has not yet been obtained.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polycarbonate resin foam / film laminate excellent in antistatic properties and conductivity.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present invention solves the above-mentioned problems by adopting a multilayer structure of a polycarbonate resin extruded foam and a polycarbonate resin film. They have found a solution that can be solved and have completed the present invention.

That is, according to the present invention, an extruded polycarbonate resin foam and a polycarbonate resin film laminated and bonded to at least a part of the surface thereof have a surface specific resistance of 5 × 10 ¹³ Ω or less. An extruded polycarbonate resin foam / film laminate is provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An extruded polycarbonate resin foam (hereinafter simply referred to as a foam) of the present invention is obtained by laminating and bonding a polycarbonate resin film (hereinafter simply referred to as a film) to at least a part of its surface. It is. The shape of the foam is film, sheet, plate, cylinder,
It can be in various shapes such as a rod, a container, etc., but from the point of use, it is usually a sheet or plate.

[0008] The foam used in the present invention is produced by a conventionally known method. Hereinafter, the production of a sheet-like or plate-like foam will be described in detail. The production of this foam includes the following steps. A step of charging a resin and additives such as an air bubble adjuster in an extruder, heating, melting and kneading in the extruder. Pressing a desired amount of a foaming agent into the kneaded material, kneading the foaming agent into the kneaded material, and foaming melt. The process of obtaining a foamed melt is extruded at a predetermined temperature from a circular die at the tip of the extruder into a low-pressure part in a cylindrical shape, and the resultant is taken on the surface of a cylindrical resin foam cooling device (mandrel). After forming a cylindrical foam, a step of cutting open in the extrusion direction to form a sheet or plate-like foam, and instead of the above-described steps, a foamable melt is formed at a predetermined temperature from a circular die at the tip of the extruder. A step of extruding into a low-pressure part in a tubular shape and sandwiching the roll between rolls to fuse the inner surface of the tubular foam to form a plate-like foam can be employed.

On the other hand, the film to be laminated and adhered to the surface of the foam in the present invention is a non-foamed film produced by a conventionally known method. In the present invention, the film is laminated and bonded to a part or all of the surface of the foam,
In this case, the film has a surface resistivity of 5 ×
It is necessary to keep it at 10 ¹³ Ω or less. For this purpose, a film made of an antistatic agent or a conductivity-imparting agent is previously formed on the film surface before laminating and bonding, or an antistatic agent or a conductivity-imparting agent is previously compounded in the film, Further, a film made of an antistatic agent or a conductivity-imparting agent is formed on the surface of the film after lamination and adhesion.

[0010] The method for laminating and bonding a film to a foam is specifically described as follows. A method in which a predetermined amount of an antistatic agent or a conductivity-imparting agent is added to a polycarbonate resin as a base resin, and after forming a functional film by an inflation method, laminating and bonding the film to a foam using a hot roll . A method in which a film made of an antistatic agent or a conductivity-imparting agent is formed on a film surface of a laminated foam obtained by laminating and bonding a polycarbonate resin film to a polycarbonate resin foam by spraying, coating, print printing, sputtering, or the like. A method in which a film made of an antistatic agent or a conductivity-imparting agent is formed on a polycarbonate resin film by spraying, coating, print printing, sputtering, or the like, and laminated and adhered to a foam using a hot roll in the same manner as described above. A non-foamable melt obtained by adding a predetermined amount of an antistatic agent or a conductivity-imparting agent to a polycarbonate resin is extruded in a die at the tip of an extruder used in the step of obtaining the foam, and then foamed to form a foam. A method of forming a film on the surface of a foam by simultaneously extruding the material into a low-pressure part from a circular die in a cylindrical shape (so-called co-extrusion method). A method of extruding and laminating a non-foamable melt obtained by adding a predetermined amount of an antistatic agent or a conductivity-imparting agent to a polycarbonate resin onto the surface of a foam.

Among the above-mentioned methods for obtaining a foam having a film laminated and adhered to at least a part of the surface thereof according to the present invention, in particular, from the viewpoints of conductive performance, durability of antistatic performance, and uniform expression of functions, ,, And are preferred. Further, the method is preferable in consideration of a decrease in function due to decomposition of the antistatic agent and the like. Further, when a film is formed on both surfaces of a sheet-like or plate-like foam or when a thin film layer is formed, the above method is particularly preferable.

In the present invention, the raw material and the foaming agent for producing the foam as the base material may be limited, but are not particularly limited. The range is generally described as follows. The polycarbonate used as the foam raw material is a polyester formed from carbonic acid and glycol or bisphenol. Aromatic polycarbonate having diphenylalkane in the molecular chain is preferable because it has excellent heat resistance, weather resistance and acid resistance. Such polycarbonates include 2,2-bis (4-oxyphenyl) propane (also known as bisphenol A),
2-bis (4-oxyphenyl) butane, 1,1-bis (4-oxyphenyl) cyclohexane, 1,1-bis (4-oxyphenyl) isobutane, 1,1-bis (4
Examples include polycarbonates derived from bisphenols such as -oxyphenyl) ethane.

The viscosity average molecular weight of the base resin used as a foam raw material in the present invention is usually 25,000 or more and 250
Those having a melt tension at 2.3 ° C. of 2.3 g or more are preferred.
The upper limit of the viscosity average molecular weight and the upper limit of the melt tension,
Usually 50,000 and 25 g. As such a polycarbonate resin, Iupilon S-1000 (viscosity average molecular weight 26000, melt tension 2.4 g (250 ° C.)) and Iupilone E-1000 [viscosity average molecular weight 32,000, melt tension 6.4 g (manufactured by Mitsubishi Gas Chemical Co., Ltd.) 250
° C)], Iupilone E-2000 [viscosity average molecular weight 29
000, melt tension 2.6 g (250 ° C.)] and the like. The melt tension was measured using a melt tension tester type II manufactured by Toyo Seiki Seisaku-sho, the distance between the orifice and the pulley connected to the load cell located immediately below the orifice was set to 250 mm, and the winding speed was 10 m / min. The polycarbonate resin dried at 120 ° C. for 3 hours at a piston speed of 10 mm / min is measured, and the average value detected by the load cell is adopted.

As the foaming agent used in the production of the foam used in the present invention, any of an inorganic foaming agent, a volatile foaming agent, and a decomposable foaming agent can be used. If only a foaming agent is used, it is difficult to obtain a foam having a high expansion ratio. Therefore, it is preferable to use a volatile foaming agent. or,
As the inorganic foaming agent, carbon dioxide, nitrogen and the like are used. Volatile blowing agents include propane, n-butane, i
-Lower aliphatic hydrocarbons such as butane, n-pentane, i-pentane and hexane; lower alicyclic hydrocarbons such as cyclobutane and cyclopentane; lower aromatic hydrocarbons such as benzene, toluene and xylene; methanol, ethanol and the like Aliphatic lower monohydric alcohols; lower aliphatic ketones such as acetone and methyl ethyl ketone; 1-chloro-1,1-difluoroethane, pentafluoroethane, 1,1,1,2
-A low boiling halogenated hydrocarbon such as tetrafluoroethane and 1,1-difluoroethane is used. The blowing agents described above can be used alone or in combination of two or more. For example, different types of blowing agents such as an inorganic blowing agent and a volatile blowing agent can be used in combination. Further, a decomposable foaming agent can be used in combination for adjusting the bubble diameter.

The amount of the foaming agent varies depending on the type of the foaming agent and the desired expansion ratio. Since the density of the foam is determined by the expansion ratio, the amount of the foaming agent mainly determined by the desired density of the foam is determined. I can say. The density of the foam used in the present invention is 0.03 to 0.6 g / cm ³ , preferably 0.06 to 0.24 g / cm ³ , and a foaming agent may be used so as to fall within this range. . The foam density is 0.
If it is less than 03 g / cm ³ , the strength of the molded product is too small,
When the density exceeds 0.6 g / cm ³ , the production cost increases as well as the heat insulation decreases and the weight increases. The density of the foam is 0.
It is preferable to be 06~0.24g / cm ^3, 0.5~10 parts by weight of foam agent weight per 100 parts by weight of the resin volatile blowing agent required therefor (when using butane),
In the case of an inorganic foaming agent, the amount is about 0.2 to 3.0 parts by weight (when carbon dioxide is used).

The foam constituting the base material in the present invention may optionally contain a cell regulator in a melt-kneaded mixture of the resin and a foaming agent in order to foam the polycarbonate resin smoothly. In this case, as the cell regulator, inorganic powders such as talc and silica, acidic salts of polyvalent carboxylic acids, and mixtures of polyvalent carboxylic acids with sodium carbonate or sodium bicarbonate are preferable. The addition amount is 0.01 to 5.0 parts by weight, preferably 0.05 to 5.0 parts by weight per 100 parts by weight of the resin.
0.5 parts by weight is preferable. If the amount is less than 0.01 part by weight, it is practically difficult to foam the polycarbonate resin, while if it is more than 5.0 parts by weight, the physical properties of the obtained foamed molded article are undesirably reduced.

The polycarbonate resin constituting the film to be laminated and adhered to the surface of the substrate foam of the present invention includes:
What is manufactured from the same raw materials as the polycarbonate resin constituting the foam is used. The viscosity average molecular weight of the polycarbonate resin used for forming the film, particularly the polycarbonate resin for the surface layer film to be laminated by the co-extrusion method, is preferably 20,000 to 35,000. If it is 35,000 or more, the fluidity is poor for coextrusion or extrusion lamination, and the thickness of the resulting foam / film laminate tends to be uneven. On the other hand, if it is less than 20,000, the surface condition of the laminate may be poor and the smoothness may be insufficient. The viscosity average molecular weight of the polycarbonate resin in the present invention is the following viscosity equation given by Schnell:

Based on [η] = 1.23 × 10 ⁻⁴ M ^0.83 (where [η] is the limiting viscosity and M is the viscosity average molecular weight), the solution is infiltrated with methylene chloride (20 ° C.) as a solvent. This is a value obtained by the pressure method. For [η], the specific viscosity ηsp at each resin concentration is measured with an Ostworld viscometer, and each concentration C [g / 100 cm ³ ] and ηsp / C are plotted on a graph to obtain the following values.

(Equation 2) As the film to be laminated and adhered to the substrate foam, any of a biaxially stretched film, a uniaxially stretched film, and a non-stretched film may be used. From the viewpoint of moldability, a stretched film, particularly a biaxially stretched film is preferable.

The thickness of the surface film layer is from 20 μm to 50 μm.
The thickness is preferably 0 μm, particularly preferably 50 to 200 μm. When the thickness of the surface film layer is less than 20 μm, pinholes are generated, or thickness unevenness occurs due to surging (subtle fluctuation of discharge), and it is difficult to obtain a stable film layer. At the time, when laminated on a foam having a low closed cell rate, there is a problem that holes are formed during vacuum forming. On the other hand, if it exceeds 500 μm, the foam has poor secondary workability. The size of the foam / film laminate is not particularly limited, but in the case of a sheet-like or plate-like foam, the overall thickness is 0.5 mm to 10 m.
The range of m is preferable, and the range of 1 mm to 5 mm is more preferable. The thickness of the foam / film laminate is 0.5 mm
If it is thinner, the molded product has no strength. If it exceeds 10 mm, it is necessary to use a powerful far-infrared heater etc. to heat the inside of the laminated foam evenly when heating in mold molding. is there.

The film constituting the foam / film laminate of the present invention contains an antistatic agent or a conductivity imparting agent on its surface or inside. Examples of the antistatic agent in this case include higher fatty acid esters of monoglycerin, higher fatty acid esters of diglycerin, complete esters of glycerin and higher fatty acids, higher fatty acid esters of sorbitan, alkylethanolamide, alkali metal salts of aromatic sulfonic acids, and fatty acids. Alkali metal salts of aromatic sulfonic acids, aromatic sulfonic acids, aromatic phosphonic acids, alkali metal salts of sulfates, and phosphoric acid diesters. As the antistatic agent, in particular, an anionic or nonionic surfactant is preferable in terms of maintaining the physical properties of the surface film layer base resin, and a nonionic surfactant is excellent in thermal stability. It is also preferable in terms of antistatic performance and poor elution. As the other antistatic agent, when an antistatic agent is kneaded into a film-forming base resin, a block copolyamide resin is preferable in terms of heat resistance. As the block copolyamide resin, a resin having a polyamide block and a polyetherester block, both of which are connected by an ester bond or an amide bond, is preferably used. The repeating unit constituting the polyamide block may be 1) in the case of an aminocarboxylic acid or a lactam having 6 or more carbon atoms, or 2) in the case of a salt of a diamine and a dicarboxylic acid having 6 or more carbon atoms, and is preferably caprolactam. , Hexamethylenediamine-adipate and the like. On the other hand, the repeating unit constituting the polyetherester block is a polyether segment of a dicarboxylic acid having 4 to 20 carbon atoms and a poly (alkylene oxide) glycol having a number average molecular weight of 200 to 6000, and preferred examples thereof include terephthalic acid, Adipic acid,
Isophthalic acid and polyethylene glycol. These antistatic agents can be used alone or in combination of two or more.

The amount of the antistatic agent varies depending on the type of the antistatic agent, but is 0.1 to 40% by weight in the base resin of the surface film layer. 40% by weight is preferred. If the addition amount is insufficient, a sufficient antistatic effect may not be exhibited, and if the addition amount is excessive, the mechanical strength of the resin composition may be insufficient.

Examples of the conductivity imparting agent contained in the surface film layer include carbon fiber, acetylene black, furnace black, and metal powder. In particular, furnace black which can impart high conductivity with a small amount of addition is preferable. Furnace black having a butyl phthalate oil absorption of 300 ml / 100 g or more and a BET specific surface area of 700 m ² / g or more can impart high conductivity particularly in a small amount, and also improves the bending properties of the base resin. Particularly preferred. These can be used alone or in combination of two or more.

The amount of the conductive agent to be added is 5 to 30% by weight, preferably 6 to 20% by weight in the base resin of the surface film layer.
% By weight. If the addition amount is less than 5% by weight, a sufficient conductivity effect may not be exhibited, and if the addition amount exceeds 30% by weight, fluidity may be deteriorated and a problem of workability may occur. In dispersing the antistatic agent or the conductivity-imparting agent in the base resin, a premixed mixture (master batch) was prepared using an extruder, a three-roll mill, a Banbury mixer, a pressure kneader, or the like. It is preferable to keep it. The obtained mixture can be laminated and adhered to the core layer by the above-described surface layer forming method or by the above method.

In the present invention, since the surface film layer contains an antistatic agent and a conductivity-imparting agent as described above,
It exhibits antistatic performance with a surface specific resistance of 5 × 10 ¹³ Ω or less, preferably 1 × 10 ¹³ Ω or less. Further, by using the above-described conductivity-imparting agent, the surface specific resistance is 1 × 10 ¹³ Ω or less. ⁴ Ω to 5 × 10 ⁸ Ω, preferably 1 × 10 ⁴ Ω to
It shows a conductivity of 5 × 10 ⁶ Ω. In the present invention, the surface specific resistance value is a value obtained by measuring a test piece after standing for 7 days at 23 ° C. and a relative humidity of 50% according to the method of ASTM D257.

The foam and / or film constituting the foam / film laminate of the present invention contains a flame retardant, a heat stabilizer,
Other additives, such as a weather resistance improver and a colorant, which are added to a normal foam or the like can be added. In addition, inorganic hydroxides such as aluminum hydroxide, calcium hydroxide, and magnesium hydroxide; inorganic carbonates such as calcium carbonate, magnesium carbonate, and barium carbonate; inorganic sulfites such as calcium sulfite and magnesium sulfite; calcium sulfate; and magnesium sulfate. , Inorganic oxides such as aluminum oxide, calcium oxide, aluminum oxide, silicon oxide, talc, clay, kaolin, zeolite, etc., or inorganic fillers such as natural minerals, etc.
% By weight can also be added.

The polycarbonate resin foam / film laminate of the present invention has excellent characteristics inherent to the polycarbonate resin, and a film made of a polycarbonate resin having good adhesion to the foam is laminated and adhered to the surface of the foam. Because of this, the mechanical strength is extremely excellent, and the mold reproducibility during heat molding,
Good formability, especially excellent deep drawability. The specific surface resistance of the surface film layer is 5 × 10 ¹³
Since it is held below Ω, it can be used in various fields where static electricity is a major problem.

[0026]

Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

Example 1 A raw material resin obtained by adding 0.05 part by weight of talc as a nucleating agent to 100 parts by weight of a polycarbonate resin (viscosity average molecular weight: 29000) obtained from bisphenol A was heated and melted in an extruder. After kneading, n-pentane was added as a foaming agent in an amount of 0.2 per kg of the polycarbonate resin.
0 mol extruder and extruded at a resin temperature of 210 ° C.
A balloon was formed, and the balloon was taken out with a mandrel having a diameter of 200 mm, and then cut open along the extrusion direction to obtain a sheet-like foam. The circular die diameter is 65mm,
The die clearance is 0.7 mm. The discharge rate of the cylindrical foam was 50 kg / hr, and the take-off speed of the foam was 6.5 m / min. This foam has a closed cell ratio of 80
%, Density 0.24 g / cm ³ , average cell diameter 0.3 mm,
Polycarbonate obtained from bisphenol A containing 10% by weight of a block copolymer of nylon 6 and polyethylene glycol diester so that the foam has a thickness of 2 mm and a sheet width of 640 mm, and has a thickness of 100 μm on one side of the foam. Resin (viscosity average molecular weight 28,000)
Was extruded and laminated to obtain a foam / film laminate. As a result of measuring the surface specific resistance value of the foam / film laminate, it was 0.9 × 10 ¹³ Ω.

Example 2 The same foam as in Example 1 was used as a core layer, and furnace black ("Ketjen Black EC" manufactured by Ketjen Black International, dibutyl phthalate oil absorption: 360 ml / 100 g, BET ratio) Surface area 8
100 m ² / g) and a 100 μm thick polycarbonate resin film (viscosity average molecular weight 3000
0) was thermally laminated to obtain a foam / film laminate. As a result of measuring the surface specific resistance value of the laminate, 1.
It was 0 × 10 ⁶ Ω.

Example 3 A raw material resin obtained by adding 0.05 part by weight of talc as a nucleating agent to 100 parts by weight of a polycarbonate resin (viscosity average molecular weight 29000) obtained from bisphenol A was supplied to an extruder. After heating, melting and kneading, 0.22 mol / kg of butane as a foaming agent was pressed into the extruder and extruded at a resin temperature of 210 ° C. to form a balloon, which was taken out with a mandrel having a diameter of 200 mm. And cut out along the extrusion direction to obtain a sheet-like foam. In addition, the circular die diameter is 65 mm and the die clearance is 0.7 mm. The discharge rate of the cylindrical foam was 53 kg / hr, and the take-off speed of the foam was 6.8 m / min. At that time, nylon 6 and polyethylene glycol
10% by weight of a block copolymer with a diester and 1% of polyethylene terephthalate having a number average molecular weight of 51,000
A polycarbonate resin (viscosity average molecular weight: 28,000) obtained from bisphenol A containing 0% by weight was co-extruded to provide a surface film layer having a thickness of 40 µm on both sides.
The foam / film laminate has a closed cell ratio of 82 in the core layer.
%, Core layer density 0.25 g / cm ³ , core layer average cell diameter 0.35 mm, overall thickness of foam / film laminate
1 mm. As a result of measuring the surface resistivity of the laminate, it was 3.0 × 10 ¹³ Ω, and the laminate was excellent in surface smoothness.

Example 4 Polycarbonate comprising bisphenol A containing 10% by weight of furnace black (“Ketjen Black EC” manufactured by Ketjen Black International, dibutyl phthalate oil absorption: 360 ml / 100 g, BET specific surface area: 800 m ² / g) Resin (viscosity average molecular weight 2
8000) was coextruded to obtain a foam / film laminate in which a surface film layer having a thickness of 40 μm was provided on both sides in the same manner as in Example 3. In this laminate, the closed cell rate of the core layer was 83%, the density of the core layer was 0.25 g / cm ³ , the average cell diameter of the core layer was 0.33 mm, and the total thickness of the laminate was 2.0 mm. As a result of measuring the surface specific resistance value of the laminate, 6.
0 × 10 ⁵ Ω and excellent surface smoothness.

The specific surface resistance and the closed cell ratio were measured as follows. [Surface specific resistance] Surface specific resistance is ASTM D25
After the test piece was allowed to stand at 23 ° C. and 50% relative humidity for 7 days according to the method of No. 7, Advantest Ultra:
It was measured with a high resistance meter. [Closed cell rate] The closed cell rate Fc (%) was measured using an air comparison specific gravity meter (Model 930, manufactured by Toshiba Beckman Co., Ltd.) in the same manner as in ASTM D2856 (air pycnometer method). It measured and was calculated | required by the following formula. However, the sample size and the apparent volume Va (cm ³ ) are as follows. -Sample size: 2 foam layers excluding the surface film layer
Cut into 5 mm squares and stack to about 30 mm. Apparent volume Va (cm ³ ): The volume of each foam layer constituting the stacked sample is measured to the unit of 10 μm with a caliper to determine the volume. Fo = [(Va−Vx) / Va] × 100 Fc = 100−Fo Fo (%): Open cell ratio Vx (cm ³ ): Actual volume of sample determined by air pycnometer method

[0032]

The polycarbonate resin foam of the present invention /
Since the film laminate has a surface specific resistance value of 5 × 10 ¹³ Ω / cm ² or less of the surface layer composed of the polycarbonate resin film laminated and bonded to at least a part of the foam body surface, it can prevent electrification such as static electricity. It has excellent antistatic properties and conductivity, and can prevent dust, dust, bacteria, and the like from adhering to the laminate and the molded product obtained therefrom. Therefore, the problem of short circuit when electronic components and the like are wrapped in a molded product obtained from the laminate of the present invention,
The problem of hygiene in food containers is solved. In addition, the polycarbonate resin foam / film laminate of the present invention has excellent characteristics inherent to polycarbonate resin, and is excellent in mechanical strength, thermoforming, and secondary workability. When it is included in the surface film layer as a conductivity imparting agent, mechanical strength such as bending is improved. In addition, when a block copolyamide resin is contained in the surface film layer as an antistatic agent, particularly excellent antistatic performance and heat resistance can be obtained. Furthermore, by setting each polycarbonate resin of the foam layer and the surface film layer constituting the polycarbonate resin foam / film laminate of the present invention to have the above-mentioned specific molecular weight, the resulting laminate is excellent in heat processability and obtained. In addition to being uniform in thickness, laminating workability, particularly, co-extrusion becomes easy.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29C 47/14 B29C 47/14 (C08L 69/00 77:00) B29K 69:00 105: 04 B29L 7:00

Claims (5)

[Claims] 1. An extruded polycarbonate resin foam and a polycarbonate resin film laminated and bonded to at least a part of its surface, wherein the film has a surface specific resistance of 5 × 10 ¹³ Ω or less. Extruded polycarbonate resin foam / film laminate. 2. The extruded polycarbonate resin foam / film laminate according to claim 1, wherein said film contains 2 to 40% by weight of a block copolyamide resin. 3. The polycarbonate resin extruded foam / film laminate according to claim 1, wherein said film contains 5 to 30% by weight of conductive carbon. 4. A laminated foam comprising a sheet or plate having a density of 0.03 to 0.6 g / cm ³ , wherein the thickness of the film is 0.02 to 0.5 mm. The polycarbonate resin extruded foam / film laminate according to any one of claims 1 to 3, wherein the thickness of the film laminate is 0.5 to 10.0 mm. 5. The polycarbonate resin constituting the foam has a viscosity average molecular weight of 25,000 or more, and the polycarbonate resin constituting the film has a viscosity average molecular weight of 20,000 or more. The extruded polycarbonate resin foam / film laminate according to any one of claims 1 to 4, wherein the laminate is bonded by extrusion.