JP2001323081A - Polyester film for bonding with rubber and laminated product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester film for bonding with a rubber, not only light in weight property but also excellent in forming property, adhesion and heat resistance and a laminated product with the rubber. SOLUTION: This polyester film for bonding with the rubber is characterized by containing 0.01-5 wt.% particles having 0.1-10 μm particle diameter, showing <=20 MPa film stress on 10% elongation at 25 deg.C, and 5-40 equivalent/ton carboxy terminal group amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester film used by laminating with a rubber and a laminate using the polyester film. The present invention relates to a polyester film for bonding to rubber and a laminate using the polyester film.

[0002]

2. Description of the Related Art Conventionally, in tires and molded products mainly made of rubber as a material, additives and the like have been mixed into rubber to use them as a material having a relatively large thickness in order to emphasize moldability and durability. . However, when the rubber is mixed with an additive to increase the thickness, the moldability and the durability are improved, but the weight is increased, and improvement in lightness is required.

In order to solve such problems, in applications such as tires, if the thickness of the rubber is reduced, problems such as a decrease in air pressure and a decrease in reliability at the time of wear of the rubber occur. However, when the thickness of the rubber is reduced, there are problems such as a decrease in mechanical properties or a decrease in reliability.

[0004] As a method of solving these problems, a method of attaching a normal biaxially stretched film or the like to rubber using an adhesive can be considered. However, the moldability is greatly reduced, or the film itself is formed after molding. Since it has high stress, it has a drawback that a large residual stress is generated between the adhesive and the adhesive and the adhesive layer is broken, and the film itself is easily broken during use. Further, when an unstretched film is simply used, there are problems in terms of handling deterioration, whitening during molding, and heat resistance (heat deterioration resistance) when the laminate is used at a high temperature.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a polyester film for bonding rubber which is excellent in moldability and durability and a polyester film for bonding rubber. To provide a laminate using the same.

[0006]

The polyester film for rubber lamination according to the present invention contains 0.01 to 5% by weight of particles having a particle diameter of 0.1 to 10 μm, and is obtained by stretching the film at 25 ° C. when expanded by 10%. Stress (referred to as stress at 10% elongation) of 2
0 MPa or less, and the carboxyl end group content is 5 to 5.
It is a polyester film for rubber bonding characterized by being 40 equivalents / ton, and the polyester film for rubber bonding of the present invention has the following preferred embodiments. (a) 0.5% to 5MP at 10% elongation at 25 ° C
a. (b) Be composed of at least two layers. (c) The relationship between the residual amount of catalyst metal (M: unit mmol%) in the film and the residual amount of phosphorus element (P: unit mmol%) satisfies the following formula I.

0.01 ≦ M / P ≦ 2 Formula I (d) At least one surface has a surface wetting tension of 50 mN / m or more.

[0008] The polyester film for bonding rubber of the present invention can be bonded to rubber via at least one or more adhesive layers to form a laminate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, it is necessary to use polyester in terms of moldability and heat resistance. Here, polyester is a generic term for polymers composed of ester bonds.

The dicarboxylic acid component used for forming the ester bond includes, for example, terephthalic acid,
Isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenylsulfonedicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sodium sulfoisophthalic acid, aromatic dicarboxylic acids such as phthalic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, Dimer acid,
Aliphatic dicarboxylic acids such as maleic acid and fumaric acid, alicyclic dicarboxylic acids such as cyclohexyne dicarboxylic acid, oxycarboxylic acids such as p-oxybenzoic acid, and ester compounds thereof can be used.

In the polyester of the present invention, terephthalic acid accounts for 80% of these dicarboxylic acid components.
It is preferable that the content be at least mol% from the viewpoint of heat resistance and durability. Examples of the glycol component used for forming the ester bond include, for example, aliphatic glycols such as ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, and neopentyl glycol; and alicyclic rings such as cyclohexanedimethanol. Group glycol, bisphenol A, bisphenol S
Aromatic glycols such as diethylene glycol, polyethylene glycol and the like can be used. In the polyester of the present invention, among these glycol components, the content of the ethene glycol component is preferably 50% or more from the viewpoint of heat resistance, particularly 70 mol%.
It is preferable that it is above.

These dicarboxylic acid components and glycol components may be used in combination of two or more.

Further, a polyester obtained by copolymerizing a polyester with a polyfunctional compound such as trimellitic acid, trimesic acid, and trimethylolpropane may be used as long as the effects of the present invention are not impaired.

As the polyester of the present invention, it is preferable to use a polyester having a melting point of 180 to 260 ° C. from the viewpoint of moldability. The melting point is more preferably from 180 to 250 ° C from the viewpoint of moldability.

Here, the melting point is the endothermic peak temperature at the time of melting, which is detected at the time of the first temperature rise (1st Run) in the so-called differential temperature calorimetry (DSC). When a plurality of peaks are observed, the temperature of the peak having the largest area is defined as the melting point.

In the present invention, in order to further improve the adhesion and the film forming stability, the intrinsic viscosity is preferably 0.6 dl /
g or more, more preferably 0.7 dl / g or more, particularly preferably 0.8 dl / g or more. If the intrinsic viscosity is less than 0.6 dl / g, the adhesiveness tends to decrease, which is not preferable. Further, the upper limit of the intrinsic viscosity is preferably 1.0 dl / g or less from the viewpoint of moldability, and is preferably 0.8 dl / g or less because moldability is particularly improved.

In the present invention, when used at a high temperature for a long time, for example, when used as an inner liner layer of a tire, the amount of carboxyl terminal groups of the polyester is 5 to 40 equivalents to prevent thermal deterioration of the film. / Ton. The amount of carboxyl end groups is preferably from 10 to 35 equivalents / ton. When the carboxyl terminal amount exceeds 40 equivalents / ton, the hydrolysis resistance of the film is lowered and the film is liable to be thermally degraded. On the other hand, if it is less than 10 equivalents / ton, the adhesiveness tends to decrease.

The catalyst used for producing the polyester of the present invention is not particularly limited, but includes alkaline earth metal compounds, manganese compounds, cobalt compounds, aluminum compounds, antimony compounds, titanium compounds, titanium / silicon composite oxides, A germanium compound or the like can be used.

For example, when titanium / silicon is used as a catalyst, a terephthalic acid component and an ethylene glycol component are reacted, and then a titanium / silicon composite oxide and a phosphorus compound are added. A method in which a polycondensation reaction is performed until the content of diethylene glycol reaches a certain level to obtain a polyester having a specific catalytic metal content and a specific phosphorus content is preferably employed. The phosphorus compound added as the heat stabilizer is not particularly limited, but phosphoric acid, phosphorous acid and the like are preferably used.

In the present invention, it is necessary to incorporate particles having a particle diameter of 0.1 to 10 μm in the film in an amount of 0.01 to 5% by weight in order to achieve both the handling of the film, the moldability and the heat resistance. . Here, if particles having a particle diameter of more than 10 μm are mainly used, it is not preferable from the viewpoint that the film is likely to have a defect and the moldability is reduced. Further, when mainly using particles having a particle diameter of less than 0.1 μm,
Since a large amount of particles is added to improve the handling, the heat resistance is lowered due to the deterioration of the moldability and the polyester, which is not preferable. The particle size is 1 to 10μ
m is more preferable.

Examples of such particles include inorganic particles such as wet and dry silica, colloidal silica, aluminum silicate, titanium oxide, calcium carbonate, calcium phosphate, barium sulfate, alumina, mica, kaolin, clay, hydroxyapatite, and styrene. And organic particles containing silicone, acrylic acid or the like as a constituent component. Among them, inorganic particles such as dry, wet and dry colloidal silica and alumina, and organic particles containing styrene, silicone, acrylic acid, methacrylic acid, polyester, divinylbenzene and the like as constituents are preferably used. These internal particles, inorganic particles and / or organic particles may be used in combination of two or more as long as the characteristics are not impaired.

The amount of these particles added is 0.01% by weight.
It is necessary for the above point to be in the range of ５5% by weight.
If the addition amount is less than 0.01% by weight, the processability when laminating the film and the rubber is undesirably reduced. On the other hand, if the amount exceeds 5% by weight, the polyester is liable to be thermally degraded and the heat resistance is lowered, which is not preferable.

In order to improve the slipperiness, an organic component and / or an inorganic component such as wax may be added in addition to the particles having a clear diameter as described above as long as the adhesiveness is not deteriorated.

In the polyester film of the present invention, the catalyst metal remaining amount (M:
It is preferable that the relationship between the unit mmol and the residual amount of phosphorus element (P: unit mmol) satisfy the following formula II.

0.01 ≦ M / P ≦ 2 Formula II Further, in order to make the heat resistance extremely good, the value of M / P shown in the above formula II is 0.05 or more and 1 or less. Is preferred.

The polyester film of the present invention needs to have a film stress of 20 MPa or less when stretched at 25 ° C. by 10% in view of moldability and heat resistance. This stress is preferably 0.1 to 10 MPa, more preferably 0.1 to 10 MPa.
It is 2 to 8 MPa, particularly preferably 0.5 to 5 MPa. When the stress is low, the stress at the time of molding is small,
It is considered that the moldability is improved, the residual stress after molding is reduced, the bonding interface is stabilized, and the heat resistance when heat and external force are applied is improved. Where 10
The stress of the film at% elongation means that the stress
% Means the stress at the time of elongation.
It shows a value obtained by measuring zero points and further averaging the average value in the longitudinal direction and the average value in the width direction.

The polyester film of the present invention is preferably an unstretched film from the viewpoint of moldability. Here, the term “unstretched” refers to a film that has not been substantially stretched using a stretching apparatus or the like, and has a plane orientation coefficient described below of 0.03 or less.

The thickness of the polyester film of the present invention is as follows:
It is preferably from 10 to 200 μm, more preferably from 15 to 150 μm, and particularly preferably from 2 to 200 μm, in view of moldability with rubber, retention of air pressure, surface protection and durability.
0 to 100 μm.

The plane orientation coefficient of the polyester film of the present invention is preferably from 0 to 0.05 from the viewpoint of moldability and durability. The plane orientation coefficient (fn) refers to the longitudinal refractive index (N) of a film measured using an Abbe refractometer or the like.
x), refractive index in the width direction (Ny), refractive index in the thickness direction (Nz)
Is a value calculated from the following formula III.

Fn = (Nx + Ny) / 2−Nz Formula III At this time, fn is more preferably 0 to 0.03.

At this time, when the longitudinal direction and the width direction of the film are not clear, the refractive indices in the main axis direction of the orientation, the direction perpendicular to the main axis direction of the orientation, and the thickness direction are respectively Nx and N.
The plane orientation coefficient can be obtained as y and Nz. In order to obtain the above-mentioned plane orientation coefficient, it is necessary not only to not substantially stretch the film but also to apply a large draw to the roll before winding the unstretched film. It is also important that the casting speed is not too high compared to the flow rate of the polymer when casting the molten sheet.

Further, in terms of moldability and heat resistance, the thickness unevenness of the polyester film in the lateral direction is preferably 30% or less,
It is more preferably 20% or less, particularly preferably 10%. As a method for measuring the thickness unevenness, a film is prepared in a length of 20 m in the longitudinal direction, the thickness is measured with a continuous thickness measuring instrument, and the thickness unevenness (%) = 100 × (maximum thickness) based on the average thickness, the maximum thickness, and the minimum thickness. −minimum thickness) / average thickness. The method of controlling the thickness unevenness is not particularly limited, but includes a method of reducing a metal component in the polyester and making it difficult to generate streaks, a method of plating a lip portion of a die, a method of using a nip roll cast, and the like. In particular, nip roll casting is preferred.

In the polyester film of the present invention, the surface wetting tension of at least one side is preferably 50 mN / m or more, more preferably 55 mN / m or more, particularly preferably 58 mN / m, from the viewpoint of durability and adhesiveness.
m or more. On the other hand, if it exceeds 70 mN / m, blocking or the like may easily occur.

The method for obtaining a polyester film having a surface wetting tension of 50 mN / m or more can be achieved by performing a surface treatment, for example, corona discharge treatment, plasma treatment, flame treatment, ultraviolet irradiation treatment, electron beam irradiation. Examples of the treatment include a treatment, a chemical treatment, a physical roughening treatment, and a surface coating treatment, but are not particularly limited as long as the effects of the present invention are not impaired. Among them, corona discharge treatment is a simple and effective method, and can be preferably performed.

Further, the polyester film of the present invention comprises
Various coatings may be applied, the coating compound,
The method and thickness are not particularly limited as long as the effects of the present invention are not impaired.

The polyester film of the present invention can have a laminated structure composed of at least two layers in order to improve moldability, adhesiveness and heat resistance. Although the form of the laminated film is not particularly limited, for example, A /
B, B / A / B, A / B / A, C / A / B, A / B /
C, A / C / B and the like may be mentioned, but a laminate structure of four or more layers may be used. Here, A, B, and C represent polyesters, which may have the same composition or different compositions, but are basically laminated by separate melt flow paths.

In the present invention, from the viewpoint of improving heat resistance, it is preferable that the rate of density change when the film is stretched at 80 ° C. by 100% is 20% or less. More preferably, it is 10% or less.

Next, the method for producing a polyester film according to the present invention will be described, but the present invention is not limited thereto. First, the polyester raw material (A) is dried as required, then supplied to a melt extruder, extruded into a film from a slit die, brought into close contact with a casting drum by an electrostatic application method, cooled and solidified, and corona-coated on one side. After performing the discharge treatment, an unstretched film having a thickness of 100 μm is wound up.

Further, for example, the polyester raw material (A) is dried as required and then supplied to a melt extruder. Further, a polyolefin (X) such as an ethylene-propylene copolymer is further supplied to another melt extruder, and a die is formed. The polyester raw material (A) and the polyolefin (X) are laminated and compounded in the portion of, extruded into a film shape from a slit die, dropped between nip roll casting drums, cooled and solidified, and subjected to corona discharge treatment on the polyester surface. Wind up the unstretched film. Thereafter, an unstretched polyester film having a thickness of 100 μm is obtained while removing the polyolefin and the polyester. In particular, the latter method is preferable in reducing uneven thickness and streaks.

The polyester film of the present invention can be used by mixing natural rubber, synthetic rubber, silicone rubber, and additives such as carbon with them, or by laminating with a vulcanized rubber layer. More specifically, these polyester films and rubber materials can be used by bonding them with each other via thermal bonding or an adhesive. In particular, from the viewpoint of adhesiveness and durability, it is preferable that both are adhered via one or more adhesive layers. As a method of applying the adhesive layer, an adhesive layer may be provided on the polyester film in advance by means such as coating or heat lamination, may be provided on the rubber in advance, or may be used when bonding the rubber and the polyester film. May be directly provided with an adhesive layer.

A laminate obtained by laminating a polyester film and rubber via at least one adhesive layer is preferably used as a molded composite material such as a tire.

The adhesive may be, for example, a urea resin adhesive, a melamine resin adhesive, a phenol resin adhesive, an α-olefin resin adhesive, etc., a polymer having a hydroxyl group and an isocyanate compound, an epoxy compound, a melamine adhesive. Adhesives and the like with a mixture with a crosslinking agent such as a compound,
Epoxy adhesive, solution type vinyl acetate resin adhesive, emulsion type vinyl acetate resin adhesive, acrylic emulsion adhesive, hot melt adhesive, cyanoacrylate adhesive, polyurethane adhesive, chloroprene rubber adhesive , Nitrile rubber adhesive, SBR adhesive,
Modified rubber emulsion adhesives, ethylene copolymer resin adhesives, resorcinol adhesives, natural rubber adhesives, cellulosic adhesives, starch pastes, dextrins, and the like.

The rubber is not particularly limited, but a natural rubber, a synthetic rubber, a silicone rubber and a rubber obtained by mixing an additive such as carbon or vulcanized with them are preferably used.

[0044]

The present invention will be described below in detail with reference to examples. In addition, each characteristic was measured and evaluated by the following methods.

(1) Melting point (° C.) 5 mg of a sample film was sampled and measured at a heating rate of 10 ° C./min by a differential scanning calorimeter (RDC220) manufactured by Seiko Instruments Inc. The peak temperature was taken as the melting point. In addition, the polyester which crystallized by the heat treatment was measured for those having a low melting peak.

(2) Intrinsic viscosity Polyester is dissolved in orthochlorophenol and
Measured in ° C.

(3) Amount of carboxyl terminal group of polyester The polyester was dissolved in o-cresol / chloroform (weight ratio: 7/3) at 100 ° C. for 20 minutes and subjected to potentiometric titration with alkali.

In the case of a laminated film, each layer was separated to obtain a desired value.

(4) Catalytic metal element amount and phosphorus element amount The sample film was heated to a melting point + 20 ° C. and melted to form a circular disk, and the catalytic metal element amount and the phosphorus element amount were determined by X-ray fluorescence analysis. . In determining the amount, a calibration curve of X-ray fluorescence obtained from a sample in which the amount of each metal element added was changed in advance was used.

The metal component due to the particles in the film was determined by removing the component. In addition, as a method for removing particles, for example, a film is dissolved in orthochlorophenol heated to 80 to 100 ° C., centrifugation is performed, particles are removed, and the polymer in the solution is precipitated. Depends on how the analysis is performed.

In the case of a laminated film, each layer was separated and obtained by scraping each layer. (5) Particle diameter An ultra-thin section was prepared by cutting a cross section of the film, and 50 photographs were taken using a transmission electron microscope at a magnification of about 5000 to 20,000 times, and the equivalent circle diameter of each particle dispersed in the polyester was obtained. Was measured and determined.

(6) Plane Orientation Coefficient Using a sodium D line (wavelength: 589 nm) as a light source and using an Abbe refractometer, the longitudinal refractive index (N
x), refractive index in the width direction (Ny), refractive index in the thickness direction (Nz)
Was calculated from the following formula III.

Fn = (Nx + Ny) / 2−Nz Formula III (7) Stress at 10% elongation at 25 ° C., length 15 from the sample film in the longitudinal direction and width direction respectively
A sample piece having a width of 0 mm and a width of 10 mm was cut out, and this sample piece was subjected to an initial length of 50 using a tensile tester manufactured by Orientec.
mm, at a pulling speed of 300 mm / min, and at 25 ° C., from the obtained load-strain curve, 10 points of stress at 10% elongation were obtained, averaged, and further averaged in the longitudinal and width directions. .

(8) Rate of change in density at 80 ° C. when stretched by 100% The length 15 in the longitudinal direction and the length in the width direction from the sample film.
A sample having a width of 0 mm and a width of 10 mm was cut out, and the initial length was 50 m using a tensile tester manufactured by Orientec.
m, at a pulling speed of 300 mm / min, at 80 ° C., and stretched 100%. The densities of the film before stretching and the film after stretching were determined by a density gradient tube, and the rate of change of the density was determined by the following formula IV.

100 × (D2-D1) / D1 Formula IV D1: Film density before stretching (g / cm ³ ) D2: Film density after stretching (g / cm ³ ) (9) Surface wetting tension ASTM -D-2578 (67T), 20 ° C, 6
It was measured in a 5RH% atmosphere.

(10) Thickness unevenness The thickness was measured with a digital thickness gauge at intervals of 1 cm over 50 cm in the width direction of the sample film, and the thickness unevenness was obtained. Here, the thickness unevenness is a percentage of the difference between the maximum thickness and the minimum thickness with respect to the average thickness.

(11) Moldability An epoxy-based adhesive (Kemit Epoxy TE2210, manufactured by Toray Industries, Inc.) is applied between the polyester film and the rubber layer, and dried.
After stretching 300% according to -K6251, the best state of the film was visually determined as follows. ◎: No scratches or cracks were observed in the appearance of the film, and there was no problem. ：: The film has scratches, but no problem. Δ: Cracks were observed in the film, and there was a problem. ×: The film was broken and there was a problem. (12) Adhesion After the above-mentioned molding, the adhesion between the polyester film and the rubber layer was measured, and the following judgment was made. A: No peeling. ：: slight peeling observed, but no problem. Δ: Large peeling was observed and there was a problem. ×: Completely peeled off, causing a problem.

(13) Heat resistance The molded rubber / adhesive / film laminate was heated at a temperature of 80
5% elongation and recovery to 0% (original position) were repeated 1000 times in an atmosphere at 100 ° C. and a humidity of 100% RH.
The state of the film after heating at 0 ° C. for 5 minutes was visually determined as described below. ◎: No scratches or cracks were observed in the appearance of the film, and there was no problem. ：: The film has scratches, but no problem. Δ: Some cracks were observed in the film, and there was a problem. X: Many cracks are seen in the film, and there is a problem.

Example 1 Using dimethyl terephthalate and ethylene glycol as raw materials, melt-mixing at 150 ° C.
Magnesium acetate was added, and the temperature was gradually raised to 235 ° C.
The methanol was distilled off to terminate the transesterification reaction. Thereafter, ethylene glycol slurry (colloidal silica 10% by weight) of colloidal silica (particle diameter 1.5 μm) was added to distill ethylene glycol (particles in polymer: 0.5% by weight). Next, antimony trioxide was added as a polymerization catalyst, and a predetermined amount of phosphoric acid was added as a heat stabilizer, and then the temperature was gradually raised to a high vacuum and 290 ° C. to polymerize polyethylene terephthalate (intrinsic viscosity 0.70 dl). / G, carboxyl end groups 20 equivalents / ton). Furthermore, a 50: 5 weight ratio of polypropylene terephthalate (intrinsic viscosity 0.8 dl / g, carboxyl terminal group 15 equivalents / ton) and polyethylene terephthalate was used.
Blended at 0. The obtained polyester mixture was added to 15
After vacuum drying at 0 ° C. for 4 hours, it is supplied to a single-screw melt extruder,
A polymer melted at 280 ° C. is extruded from a slit die into a sheet, adhered to a mirror cooling drum by electrostatic application (10 kV), cooled and solidified, and a corona discharge treatment was performed on one side of the film. A stretched film was obtained. The obtained film showed excellent moldability, adhesiveness and heat resistance as shown in Table 1.

Example 2 The polyester of Example 1 was replaced with 1
It is supplied to the first melt extruder, and the ethylene-propylene copolymer is further supplied to another melt extruder, and is compounded into two layers at the die part, extruded into a film from a slit die, and nip roll casting. After being dropped between the drums, cooled and solidified, the polyester surface was subjected to a corona discharge treatment, and then the unstretched film was wound up. afterwards,
10 thickness while peeling polyolefin and polyester
An unstretched polyester film of 0 μm was obtained. The obtained film had particularly good unevenness in thickness, and as shown in Table 1, exhibited particularly excellent moldability, adhesiveness, and heat resistance.

Example 3 Instead of polypropylene terephthalate, polybutylene terephthalate (intrinsic viscosity 1.1 dl / g, carboxyl end group 12 equivalents / ton)
And the blend ratio (weight ratio) was PBT: PET = 5
A film was obtained in the same manner as in Example 2 except that the ratio was 0:50.
The obtained film had particularly good unevenness in thickness, and exhibited excellent moldability, adhesiveness, and heat resistance as shown in Table 1.

Example 4 Example 2 was carried out in the same manner as in Example 2 except that the amount of catalyst metal during the polymerization of PET was changed and the M / P in the polyester film was set to 3. The obtained film showed excellent moldability, adhesiveness and heat resistance as shown in Table 1.

Example 5 Example 5 was carried out in the same manner as in Example 1 except that the strength of the corona discharge treatment was reduced and the surface wetting tension was changed to 49 mN / m. The obtained film showed excellent moldability, adhesiveness and heat resistance as shown in Table 2.

Example 6 The polyester of Example 1 was supplied to different extruders at different mixing ratios to obtain a composite film. The resulting film showed excellent moldability, adhesiveness and heat resistance as shown in Table 2. In particular, the adhesiveness was excellent.

Comparative Example 1 Polyethylene terephthalate (intrinsic viscosity 0.72 dl / g, carboxyl terminal group 43)
Equivalent / ton, M / P = 4) and the casting temperature is 8
At 0 ° C., an unstretched film was obtained. The resulting film had a stress at the time of 10% elongation at 25 ° C. of 22 MPa,
As shown in Table 2, moldability, adhesiveness, and heat resistance were all inferior.

Comparative Example 2 When the particles to be added to the polyester of Example 2 were aluminum oxide having a particle diameter of 0.05 μm and the amount added was 6% by weight, as shown in Table 2, moldability and adhesiveness were obtained. And heat resistance were all inferior.

[0067]

[Table 1]

[0068]

[Table 2] The symbols in the table are as follows.

PET: polyethylene terephthalate PTT: polypropylene terephthalate PBT: polybutylene terephthalate

[0070]

According to the present invention, by controlling the added particles of the polyester film and the stress at 10% elongation at 25 ° C., not only the lightness is excellent, but also the moldability, adhesiveness and heat resistance are excellent. In addition, a polyester film for lamination with rubber such as a tire and a vibration isolator and a laminate thereof can be obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) C08L 67/00 C08L 67/00 F term (reference) 4F071 AA22 AA32 AA44 AA45 AA46 AA47 AA67 AB18 AB21 AB24 AB25 AB26 AE17 AF15 AH08 BB06 BC01 BC10 4F100 AA20H AB01B AB01C AK41B AK41C AK42B AK42C AN00A BA02 BA03 BA07 BA10A BA10C BA13 CA23B CB00 DE01B DE01H EH17 EJ55 JB04B JB04C JJ03 JK02B JK06 JL01 YY00B YY00C YY00H 4J002 BC012 BC032 BG012 CF002 CF031 CF041 CF051 CF061 CF071 CF081 CF101 CP032 DA057 DE136 DE146 DE236 DG046 DH046 DJ006 DJ016 DJ036 DJ056 FD016 GN01 4J029 AB02 AB07 AD10 BA02 BA03 BA04 BA05 BA10 BB13A BD03A BF09 BF25 BH02 CA01 CA02 CA04 CA06 CB01 CB04A CB05A CB06A CB10 JA03DB01 JA03 DB03 JA03 JC581 JC711 JE053 JE093 JE223 JF321 KB05 KE02

Claims (6)

[Claims] 1. The method according to claim 1, wherein the particles having a particle size of 0.1 to 10 μm
Polyester film for rubber lamination, containing 1 to 5% by weight, wherein the film has a stress of 20 MPa or less when stretched by 10% at 25 ° C., and has a carboxyl end group content of 5 to 40 equivalents / ton. . 2. The polyester film for rubber lamination according to claim 1, wherein the stress of the film at 10% elongation at 25 ° C. is 0.5 to 5 MPa. 3. The polyester film for rubber lamination according to claim 1, wherein the polyester film is composed of at least two layers. 4. The relationship between the residual amount of catalytic metal (M: unit mmol%) and the residual amount of phosphorus element (P: unit mmol%) in the film satisfies the following formula I. 4. The polyester film for rubber lamination according to any one of items 1 to 3. 0.01 ≦ M / P ≦ 2 Formula I 5. A surface wetting tension of at least one side is 50 m.
The polyester film for rubber lamination according to any one of claims 1 to 4, wherein the N / m is at least N / m. 6. A laminate obtained by laminating the polyester film for rubber lamination according to claim 1 and rubber via at least one or more adhesive layers.