JP2001205762A - Deodorant polyester film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester film in which deodorant particles are hard to be dropped from a surface of the film and having excellent deodorizing performance. SOLUTION: The deodorant polyester film comprises a polyester B layer containing deodorant particles having a mean particle size of 0.3 to 20 μm and a heat resistant temperature of 300 deg.C or higher of 2 to 100,000 pieces/mm2 and provided on at least one side surface of a polyester A layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester film in which deodorant particles do not easily fall off the film surface, are excellent in chemical resistance, water resistance, tearability and deodorization performance. More specifically, the present invention relates to a film suitable for various packaging materials such as food, multifunctional synthetic paper having a deodorizing function, various cards, wallpaper, and decorative materials for decorative boards.

[0002]

2. Description of the Related Art In order to realize a comfortable living space, various deodorants have been developed and methods for supporting a deodorant on a target structure have been proposed. On the other hand, polyester films are used in various applications because they are resistant to tension, tearing and twisting, are excellent in dimensional stability, chemical resistance and water resistance, and have a high heat deformation temperature.

[0003] For example, Japanese Patent Application Laid-Open No. 10-28 discloses a method in which a deodorant is carried on the surface of a film or sheet to have a deodorizing function.
It is described in Japanese Patent No. 0298, which proposes that the deodorant is carried on the sheet surface by immersing in a liquid in which the deodorant is dispersed, spraying, and applying the liquid.

[0004] However, the deodorant localized on the surface of the film or sheet falls off due to bending or rubbing of the film,
Deterioration performance is degraded and the appearance of the film is impaired. Further, if a resin binder is used in a coating solution or the like in order to improve the adhesion to the film, the deodorant will be covered with the resin, and the adsorptivity of molecules that cause malodor will deteriorate.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a polyester film in which deodorant particles hardly fall off from the film surface and which have excellent deodorizing performance. To provide.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that a layer containing deodorant particles having a specific particle size is provided on at least one surface of a polyester film. The inventors have found that a film having excellent odor performance and in which deodorant particles are hard to fall off can be obtained, and the present invention has been completed.

That is, the gist of the present invention resides in that at least one surface of the polyester A layer is provided with 2 to 1 deodorant particles having an average particle size of 0.3 to 20 μm and a heat resistance temperature of 300 ° C. or more.
A deodorant polyester film having a polyester B layer containing 00000 / mm ² .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The polyester in the present invention includes aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, ethylene glycol, diethylene glycol, tetramethylene glycol, neopentyl glycol, 1,4 -A polyester having an ester with a glycol such as cyclohexanedimethanol as a main component. The polyester can be obtained by directly polymerizing an aromatic dicarboxylic acid and a glycol, or by subjecting a transalkylation reaction of an aromatic dicarboxylic acid dialkyl ester and a glycol to a polycondensation method, or a diglycol of an aromatic dicarboxylic acid. It can also be obtained by a method such as polycondensation of an ester. Representative examples of the polyester used in the present invention include polyethylene terephthalate, polyethylene-2,
6-naphthalenedicarboxylate (PEN) and the like are exemplified. Such a polyester may be a homopolymer that is not copolymerized, and 10 mol% or less of the dicarboxylic acid component is a dicarboxylic acid component other than the main component, or 10 mol% or less of the diol component is a diol component other than the main component. Such a copolymerized polyester may be used.

The intrinsic viscosity of the polyester used is usually from 0.45 to 1.0, preferably from 0.50 to 1.0, as a value after the film is formed. If the intrinsic viscosity is less than 0.45, the film tends to break during film formation. On the other hand, when the intrinsic viscosity is 1.0
When it exceeds, the stretchability may decrease and the productivity may decrease.

The deodorant used in the present invention has an average particle size of 0.3 to 20 μm and a heat resistance temperature of 300 to prevent the particles from being broken by the compressive force applied to the particles in the stretching step during film formation.
It must be a particle having a temperature of not less than ° C., and is usually a porous inorganic or organic particle.

The average particle size of the deodorant particles is 0.3 to 20 μm.
m, preferably 0.5 μm to 15 μm, more preferably 0.7 μm to 10 μm. Average particle size 0.3
If it is less than 1, the particles are buried in the polyether, and the deodorizing effect is hindered. When the average particle size is 20 μm or more, the particles easily fall off the surface.

The content of the deodorant particles is 2 to 2 in the B layer.
100000 pieces / mm ^2, preferably 100 to 500
0 / mm ² . The content of deodorant particles is 2 / mm
^If less than ² , sufficient deodorizing performance is not exhibited, and
If the number is 0 / mm ² or more, the strength of the layer B is insufficient, and the film surface is easily worn.

The heat resistant temperature of the deodorant is 300 ° C. or higher, preferably 320 ° C. or higher. If the heat-resistant temperature is lower than 300 ° C., it is decomposed in the melt extruder, not only impairing the function as a deodorant, but also generating bubbles and foreign matters that cause the film to break.

The BET specific surface area of the deodorant particles is not particularly limited.
No, but usually 10m^Two/ G or more and 20 m^Two/ G or less
Those having the above specific surface area are preferred. BET specific surface area is 1
0m ^Two / G is less than the amount of the substance causing the odor
In some cases, it may not show a sufficient deodorizing effect.

The deodorant particles include at least one of an alkali metal, an alkaline earth metal, a metal element, more specifically, at least one of copper, iron, zinc, silver, zirconium, titanium, silicon, aluminum, magnesium, and calcium. Group containing inorganic compounds such as oxides, hydroxides, phosphates, sulfates, nitrates, carbonates, silicates and aluminates or double salts thereof, and sulfonic acid groups, phosphorus It is preferable to select from the group consisting of organic particles having functional groups such as acid groups and amino groups (for example, ion exchange resins). Particularly preferred particles in the present invention include zirconium element-containing inorganic compound particles, amorphous silica particles and zeolite particles.

If necessary, the layer B may contain fine particles of aluminum oxide effective for scratch resistance and particles of titanium oxide and barium sulfate effective for glossiness.

The thickness of the layer B in the present invention is not particularly limited, but is 0.5 to 50 μm, and the ratio (R / L) between the average particle size R of the deodorant particles and the thickness L of the layer B is 0. .02-
It is preferably 2.0. If the R / L is less than 0.02, the film may have insufficient running properties due to insufficient surface roughness, or the deodorant particles may be buried to deteriorate the deodorizing properties. Also 2.
When it is 0 or more, the deodorant particles tend to fall off.

The raw material of the polyester film constituting the layer A in the present invention is not particularly limited, and a recycled raw material may be used as long as the strength of the film is maintained. Further, the layer A may contain inert inorganic particles or organic particles. The thickness of the layer A is usually from 10 to 500 μm.

The polyester film of the present invention may contain, if necessary, an antistatic agent, a coloring agent, an antioxidant, an antifoaming agent,
Additives such as a fluorescent whitening agent and flame retardancy may be blended.

Further, if necessary, a coating treatment for the purpose of imparting lubricity, releasability, antistatic property, easy adhesion, tackiness and the like can be carried out.

Next, the method for producing the film of the present invention will be described specifically, but it is not particularly limited to the following examples as long as the constitutional requirements of the present invention are satisfied.

A raw material chip obtained by dispersing deodorant particles and the like in a polyester chip by adding or kneading at the time of polymerization, for example, during polymerization is used as it is or blended with another raw material chip to obtain a predetermined amount of added concentration.

A raw material chip containing a predetermined amount of dried deodorant particles is melt-extruded from a sub-extruder, and a polyester raw material is melt-extruded from a main extruder. The molten polymer extruded from the separate extruder is bonded and laminated in a laminar flow form in the molten polymer flow channel tube or the extrusion die, extruded from the die at a temperature of from the melting point of the raw material polymer to 320 ° C, and cooled on a casting drum. Let it solidify. At this time, it is preferable to use an electrostatic contact method as a means for holding the unstretched sheet in close contact with the drum.

The obtained unstretched sheet is subjected to the next stretching step. In the stretching step, the sheet is formed in a temperature range of Tg (glass transition temperature) -10 ° C. to Tc (crystallization temperature) -10 ° C. in an area magnification of 3 to 50 times, preferably 6 to 30 times. It is stretched in the longitudinal direction (longitudinal direction) and / or the width direction (lateral direction). The stretching method may be uniaxial stretching or biaxial stretching depending on the application.
When performing biaxial stretching, any of sequential biaxial orientation stretching, simultaneous biaxial orientation stretching, and a combination thereof may be used. In the case of sequential biaxial stretching, a method of stretching in the longitudinal direction and then stretching in the transverse direction is generally preferably employed. When stretching in the longitudinal and transverse directions, each may be stretched in one step, but may be stretched in multiple steps, or a heat treatment step for relaxing the orientation may be provided between the multiple steps.

In order to impart adhesiveness, tackiness, antistatic ability and release property to the film during or after the above stretching step, a coating layer is formed on one or both sides of the film, or a discharge such as corona treatment is performed. Processing or the like can also be performed.

[0027]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention. The measurement methods and the definitions of terms used in the present invention are as follows. (1) Average particle size and content of deodorant particles After the surface in the film stretching direction was incinerated by 0.2 to 0.4 μm using a low-temperature ashing plasma device, the particles were separated for each particle by a scanning electron microscope. Observe the maximum value and the minimum value of the diameter and calculate the average value of the particle diameter. The average value of the particle size was determined for 100 or more particles, and the arithmetic mean of each was defined as the average particle size. Further, the number of particles of 100 or more from a photograph taken by a scanning electron microscope was counted, and the number of particles per unit area was calculated to be the content. (2) Heat resistance temperature This is the temperature at the time of 10% weight loss of the polymer particles measured using a thermobalance (Rigaku Denki Co., TAS100) under a nitrogen gas atmosphere at a heating rate of 20 ° C./min. (3) Layer thickness The film cross section was observed by a transmission electron microscope (TEM). That is, a small piece of the film sample was embedded in a resin in which a curing agent and an accelerator were mixed with an epoxy resin, and a section having a thickness of about 200 nm was prepared with an ultramicrotome to obtain a sample for observation. A micrograph of the cross section of the obtained sample was taken using a transmission electron microscope H-9000 manufactured by Hitachi, Ltd., and the thickness of the B layer was measured by focusing on the deodorant particles. However, the acceleration voltage was set at 300 kV, and the magnification was set within the range of 10,000 to 100,000 times according to the thickness of the B layer.
The thickness was measured at 50 points, and 10 points from the thicker and 10 points from the thinner were deleted, and 30 points were averaged to obtain a measured value. (4) Deodorizing performance One A4-size film sample was placed in a Teflon bag having a capacity of 1 L, ammonia was injected to a concentration of 100 ppm, and the ammonia concentration after standing for 24 hours in a dark room at room temperature was detected. Was detected. (5) Dropping property of particles White powder adhering to a field roll in a winder of a stretched film was visually observed, and evaluated by the following three grades of ○, Δ, and ×. The observation was performed when the film was wound up by 1000 m.

Example 1 After drying at 170 ° C. for 3 hours, Zr having an average particle size of 1.0 μm,
Phosphorus element-containing inorganic particles (Toagosei Co., Ltd. product name: NS-
The polyethylene terephthalate raw material chips containing 1.0% by weight of 10) were supplied to the sub-extruder, and the polyethylene terephthalate raw material chips were supplied to the main extruder.
The mixture was melted at 80 to 300 ° C., and the molten polymer of the sub-extruder was separated from the molten polymer from the main extruder by a feed block through a gear pump filter, and was taken through a die to a casting drum to obtain an unstretched film. At the time of casting, an electrostatic contact method was adopted. The thus-obtained unstretched film is fed to a longitudinal stretching roll, stretched 2.9 times at a film temperature of 83 ° C. (with an IR heater), and further stretched 1.4 times at 87 ° C. (with an IR heater). And stretched 4.4 times in the transverse direction at 130 ° C. to obtain a biaxially oriented film. Next, the obtained biaxially oriented film is led to a heat setting zone,
Heat fixing was performed at 235 ° C. for 5 seconds while relaxing 3% in the width direction. The total thickness of the obtained film was 50 μm, and the thickness of the layer B was 10 μm.

Example 2 A film was obtained under the same conditions as in Example 1 except that a polyethylene terephthalate raw material chip containing 1.0% by weight of amorphous silica having an average particle size of 2.5 μm was supplied to a sub-extruder.

Example 3 A film was obtained under the same conditions as in Example 1 except that a polyethylene terephthalate raw material chip containing 1.0% by weight of zeolite particles having an average particle size of 2.0 μm was supplied to a sub-extruder.

Comparative Example 1 Example 1 was repeated except that a polyethylene terephthalate raw material chip containing 1.0% by weight of γ-type aluminum oxide particles having an average primary particle diameter of 20 nm and an average secondary particle diameter of 0.1 μm was supplied to a sub-extruder. A film was obtained under the same conditions as described above.

Comparative Example 2 A film was obtained under the same conditions as in Example 1 except that a polyethylene terephthalate raw material chip containing 0.01% by weight of amorphous silica having an average particle size of 2.5 μm was supplied to a sub-extruder.

Comparative Example 3 Dry pulverized calcium carbonate particles having an average particle size of 25 μm were prepared as follows.
A film was obtained under the same conditions as in Example 1 except that a polyethylene terephthalate raw material chip containing 0% by weight was supplied to the sub-extruder.

[0034]

[Table 1] As is clear from Table 1, Examples 1, 2 and 3, which satisfy the requirements of the present invention, are excellent in deodorizing effect, moreover, the deodorant particles hardly fall off the film surface, and are resistant to chemicals, water, and tear. Excellent.

[0035]

INDUSTRIAL APPLICABILITY The polyester film of the present invention can be suitably used for various packaging materials for foods, multifunctional synthetic paper having a deodorizing function, various cards, building materials for wallpapers and decorative boards, and its industrial value. Is expensive.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) B65D 65/40 B65D 65/40 F 81/26 81/26 LF term (reference) 3E067 AB01 BA11A BB14A BB22A BB25A CA16 CA30 GB11 GB15 3E086 AB01 BA04 BA15 BA35 BB15 BB41 CA01 4C080 AA05 BB02 CC08 HH05 JJ06 KK08 LL10 MM01 MM02 MM04 MM06 MM11 MM40 NN26 4F100 AA01B AA01H AA03B AA03H AA04B AA04H AA07B AA07H AA08B AA08H AA17B AA17H AA20 AA20H AC04 AC04H AK41A AK42 BA02 CA12B DE01B EJ38 GB08 GB23 GB71 JC00 JJ03B YY00B

Claims (3)

[Claims] Claims: 1. A polyester A layer, on at least one side,
A deodorant polyester film comprising a polyester B layer containing ² to 100,000 deodorant particles / mm ² having an average particle diameter of 0.3 to 20 μm and a heat resistance temperature of 300 ° C. or higher. 2. The method according to claim 1, wherein the deodorant particles comprise an oxide, hydroxide, phosphate, sulfate, nitrate, carbonate, silicate containing at least one alkali metal, alkaline earth metal or metal element. The deodorant polyester film according to claim 1, wherein the polyester film is at least one selected from the group consisting of an inorganic compound which is an aluminate salt or a double salt thereof and an organic compound having a functional group on the particle surface. 3. The deodorant polyester film according to claim 1, wherein the deodorant particles are an inorganic compound containing at least zirconium and a phosphorus element.