CN107031160A - Optical Polyester Film - Google Patents
Optical Polyester Film Download PDFInfo
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- CN107031160A CN107031160A CN201610849574.5A CN201610849574A CN107031160A CN 107031160 A CN107031160 A CN 107031160A CN 201610849574 A CN201610849574 A CN 201610849574A CN 107031160 A CN107031160 A CN 107031160A
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- polyester
- multilayer film
- layer
- top layer
- film
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/308—Heat stability
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
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- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The present invention relates to a kind of polyester film on the top layer including sandwich layer and its two surface.In further detail, being related to a kind of optics polyester multilayer film realized the high grade of transparency and brightness and there is outstanding dimensional stability.
Description
Technical field
The present invention relates to a kind of optical thin film.In further detail, being related to a kind of table including sandwich layer and its two surface
Layer, realizes the high grade of transparency and brightness and the optics polyester multilayer film with outstanding dimensional stability.
Background technology
Optical thin film is used as the film of display optical material.It is used as LCD BLU (Back LightUnit：The back of the body
Light unit) or the various displays such as touch panel (Touch Panel) surface protection optical material.
This optical thin film has a high grade of transparency, and requires the physical property such as outstanding surface characteristic and low-shrinkage, from
And suitable for such as touch purposes of tablet personal computer (Tablet), smart mobile phone at present.If transparency is low, brightness declines,
When surface characteristic is bad or shrinkage factor of film is high, curling (curl) or final products deformation etc. may occur after application and ask
Topic.
In view of these physical property, optical thin film is formed by polyester film high-temperature maturing, or utilizes such as poly- naphthalene diformazan
Sour glycol ester (PEN), the high-fire resistance macromolecule of polyimides (PI) are made.But, polyester film high-temperature maturing process
It is likely to decrease productivity or occurs to deform as caused by moisture etc..In addition, using PEN or PI in heat resistance and dimensionally stable
Property aspect it is favourable, but manufacturing cost can be caused to go up, the following process hardly possible with polyester compared with.On the other hand, it is special in Japanese Laid-Open
The dimensional stability changed for humidity is disclosed in sharp number No. 2009-279923 (patent document 1) and heat resistance is outstanding simultaneously
And the multi-layered polyester film of curling can be suppressed.Its plan is achieved the goal using copolymer composition, but is due in following process work
Shrinkage factor is aggravated and occurs curling (curl) in sequence, and manufacturing cost is fairly expensive.
Citation
Patent document
Patent document 1：Japanese Laid-Open Patent the 2009-279923rd (2009.12.03)
The content of the invention
Technical problem to be solved
The present invention is suggested to solve the above problems, thin its object is to provide a kind of optics polyester multilayer
Film, it has the low characteristic of thermal contraction, and can realize the high grade of transparency and brightness.
In addition, it is an object of the invention to provide a kind of optics polyester multilayer film, its have outstanding surface characteristic with
And dimensional stability, and processability brilliance is coated, thermal deformation is few, thus manufacturability is remarkable.
In addition, it is an object of the invention to provide a kind of optical thin film, when applied to display especially touch panel or
During back light unit (BLU), outstanding physical property and anufacturability can be realized.
Technical scheme
In order to achieve the above object, the present invention provides a kind of polyester multilayer film, by polyester resin by co-extrusion pressure and
Stretching and form more than three layers of plural layers, when on the basis of film gross weight, include 70~90 weight % sandwich layer and 10
At least two layers of the top layer on~30 weight % two surfaces for being layered in the sandwich layer, the polyester resin for forming the top layer
And the difference for the intrinsic viscosity for the polyester resin for forming sandwich layer is less than 0.15, and the top layer is flat comprising 20~100ppm
Equal particle diameter is 0.5~5 μm of particle.
Now, the polyester multilayer film can be by sandwich layer and the top layer formed on its two surface constitute it is three layers thin
Film, but be not limited to this, can be that the plural layers formed in the way of upper epidermis for two layers are formed on two surfaces of sandwich layer.
Specifically, after polyester multilayer film of the invention can be by more than two melt extruded machine extrusion moltens,
After casting and be biaxial stretch-formed, implement heat treatment and be made.In addition, during heat treatment, alongst and width
Relaxation is implemented in direction, so as to adjust shrinkage factor, but is not necessarily limited to this.
In addition, the present invention provides a kind of optical thin film, its include on the top of the polyester multilayer film selected from hard conating,
Functional-coated layer more than any one in adhesive phase, light diffusion layer, ITO layer and printing layer.
In addition, the present invention provides a kind of manufacture method of polyester multilayer film, it comprises the following steps：
(a) melt extruded is used to form sandwich layer and each polyester and resin composition on top layer, and carries out co-extrusion pressure；
(b) sheet material Jing Guo co-extrusion pressure is uniaxially or biaxially stretched, to manufacture film；And
(c) film being stretched is heat-treated,
When wherein, on the basis of film gross weight, the content of the sandwich layer is 70~90 weight %, the content on the top layer
For 10~30 weight %；
The polyester and resin composition for forming top layer is included and small for the difference of the intrinsic viscosity for the polyester resin for forming sandwich layer
In the particle that the average grain diameter of 0.15 polyester resin, and 20~100ppm is 0.5~5 μm.
Beneficial effect
The advantage of optics polyester multilayer film of the present invention is that it is possible to realize the high grade of transparency and brightness, and
With the low characteristic of thermal contraction, thus dimensional stability is remarkable.
In addition, the surface characteristic and coating processability of the optical thin film that the present invention is provided are outstanding, and thermal deformation is few, because
And manufacturability is extremely remarkable.
Moreover, it relates to optical thin film be with the advantage of polyester multilayer film, be applied to touch panel
Or BLU etc. display when, outstanding physical property can be realized, and improve productivity.
Brief description of the drawings
Fig. 1 is to show the chart of thermal coefficient of expansion and flex point using thermomechanical analyzer (TMA).
Embodiment
Below, by preferred embodiment, being described in detail for the optical polyester film of the present invention.But, this
It is not intended to limit the protection domain being defined by the claims.In addition, unless otherwise defined, otherwise in the explanation of the present invention
Used in all technical terms and scientific terminology there is the implication that those skilled in the art are generally understood that.
" % " in the present invention refers to " weight % " in the case of not specifically mentioned.
In addition, " length direction " in the present invention refers to " operating direction " in the case of not specifically mentioned.
The inventors found that following content, so as to complete the present invention：By carrying out co-extrusion to polyester resin
More than three layers of plural layers formed by pressure and stretching, including sandwich layer and formation the top layer on the surface of sandwich layer two,
By comprising to the sandwich layer on the basis of film gross weight and the polyester resin of the weight range on top layer, the top layer and sandwich layer
The difference of intrinsic viscosity and be contained in top layer particle average grain diameter and content adjusted, the high grade of transparency can not only be realized
And brightness, and using the low characteristic of thermal contraction, dimensional stability can be effectively improved.
Below, to one embodiment of the invention, it is described in more details.
Polyester multilayer film of the present invention is more than three layers as formed by polyester resin by co-extrusion pressure and stretching
Plural layers,
When on the basis of film gross weight, the sandwich layer containing 70~90 weight %, 10~30 weight % be layered in it is described
At least two layers top layer on two surfaces of sandwich layer,
The difference of intrinsic viscosity of the polyester resin on the top layer and the polyester resin of formation sandwich layer is formed less than 0.15, and
Average grain diameter comprising 20~100ppm is 0.5~5 μm of particle.
That is, the present invention is the polyester multilayer film being made up of sandwich layer and top layer, by using the spy for forming each layer
While determining polyester resin, and combine to the weight on sandwich layer and top layer than, the average grain diameter of particle that is contained in sandwich layer and
The composition that content is adjusted, can realize Expected Results.When particle size in specific resin, the weight ratio of each layer and top layer
With some in content be not in the range of when, then be difficult to improve chi by low-shrinkage desired by the present invention
Very little stability, the effect realized the high grade of transparency and brightness, improve surface characteristic and coating processability.
Specifically, polyester multilayer film of the present invention can be formed by the top layer on sandwich layer and its two surfaces
Three-layer thin-film, but be not limited to this or form more than two layers of the mode on top layer on sandwich layer two surface to be formed
Plural layers.
The sandwich layer and top layer are formed by polyester resin.The polyester resin is not particularly limited, but can be with excellent
Select single polyethylene terephthalate (PET).Now, the polyester resin is used in each layer of sandwich layer and top layer
When, with specific physical property, it is characterised in that be preferred for the intrinsic viscosity of the polyester resin on top layer and the polyester tree for sandwich layer
The difference of the intrinsic viscosity of fat is less than 0.15.Can be preferably used to form the sandwich layer and the polyester resin on top layer intrinsic viscosity it
Difference is less than 0.09, more preferably less than 0.05.When in above range, by combine to the weight ratio on sandwich layer and top layer,
The composition that particle is adjusted in top layer, can realize the effect for improving dimensional stability by low-shrinkage.On being not in
When stating scope, persistently it is broken, and interfacial instability, thus be possible to be difficult in technique.
As a kind of embodiment, the intrinsic viscosity of the polyester resin for forming the sandwich layer can be 0.6 to 0.8,
It is preferred that 0.62 to 0.78, more preferred 0.65 to 0.72.It is resistance to when the intrinsic viscosity of the polyester resin of the sandwich layer is less than 0.6
It is hot to reduce, interfacial instability is likely to occur during co-extrusion pressure, when more than 0.8, extrusion process is difficult, thus have can for operability
Can reduction.
In addition, by co-extrusion pressure, the intrinsic viscosity of two layers of polyester resin with upper epidermis is formed on two surfaces of the sandwich layer
Spend for 0.6 to 0.8, preferably 0.64 to 0.75.When the intrinsic viscosity of the polyester resin on the top layer is less than 0.6, it is possible to
Interfacial instability occurs during co-extrusion pressure, and because viscosity is too low, it is possible to had difficulties in extrusion process, and work as and exceed
It is thin due to being difficult to carry out extrusion process in common extruder the equipment, it is necessary to expensive, and when high temperature extrusion when 0.8
Film physical property is possible to significantly reduce.
The top layer of the present invention includes particle.The particle is not particularly limited, but can preferred inorganic particulate.This
When, it is important that by adjusting the average grain diameter and content of the particle with combining for other constituents.
Particle of the present invention is characterised by that average grain diameter is 0.5~5 μm.When the average grain diameter of particle is not in
During above range, because light transmittance significantly declines, when carrying out BLU evaluations, it is difficult to shortcoming is judged by naked eyes, thus it is difficult
For use as optical applications, especially percent thermal shrinkage bad characteristic, therefore dimensional stability is possible to significantly reduce.
In addition, content of the particle in top layer is 20~100ppm., can be effective when in the content range
Optical property is improved, this can combine the average grain diameter of particle to be adjusted, so as to realize synergy.And then, to particle
Content range and the composition that is adjusted of average grain diameter, by according to weight than the certain tree with forming sandwich layer and top layer
Fat is combined, by outstanding heat shrinkability characteristic, can lift dimensional stability with surprising amplitude.On the contrary, above-mentioned when being not in
During content range, the transparency or flatness decline, when applied to touch panel etc., it is possible to be difficult with.In addition, being used as one
Example, when particle content is more than 100ppm, even if using 0.5 μm of particle, also can be because of the transparency of film when coating process
Decline and be difficult to carry out quality inspection, it is difficult to as protection purposes, when particle content is less than 10ppm, even if using 5 μm of particle,
It is also possible to occur adhesion, cut in film making process or cut can be produced in subsequent technique.
The species of particle is not particularly limited the present invention, but can preferably use selected from by silica, zeolite with
And a certain or two or more mixture in the inorganic particulate of kaolin composition.This inorganic particulate can be by stretching work
Sequence improves the sliding of film and windability.
In addition, in polyester multilayer film, relative to the content of monolithic film membrane, the content of sandwich layer is 70 to 90 weight %,
The content on top layer is 10 to 30 weight %, and preferably the content of sandwich layer is 70 to 80 weight %, and the content on top layer is 20 to 30 weights
% is measured, this is conducive to interface stability during co-extrusion pressure, while by being combined with other constituents, can realize outstanding heat
The lifting effect of shrinkage character and dimensional stability.
Polyester multilayer film of the present invention is not particularly limited, but overall film thickness is preferably 50 to 300 μm,
It is preferred that 75 to 250 μm.
As a kind of specific embodiment, the polyester multilayer film is the extruded polyester in an extruder, another
While after melt extruded polyester and particle, making each fused mass after feedboard meets, by co-extrusion pressure in one extruder
And be made.Hereafter, after casting switchs to cooling, after being biaxially stretched successively, winding is formed.Now, it is described biaxial stretch-formed
After first can alongst implementing, stretched along width, but be not necessarily limited to this.Hereafter, it is described
The polyester multilayer film being stretched passes through heat treatment step.Now, heat treatment temperature is lifted in order to control shrinkage factor, Huo Zheyan
Length direction and width implements relaxation, compared with controlling heat treatment temperature, preferably along length direction and width
Implement relaxation to manufacture in direction.
As previously described, the center line average roughness Ra of polyester multilayer film of the present invention is 6~20nm, 10 points
Mean roughness Rz is 80~400nm, and the percent thermal shrinkage after being heat-treated three days at 85 DEG C can be less than or equal to 0.3%.
When the center line average roughness Ra more than 20nm and 10 mean roughness Rz more than 400nm when, base material is thin
The surface of film is possible to be transferred on adhesion layer, thus the quality of final products is possible to decline.In addition, when Ra is less than 6nm, Rz
During less than 80nm, flatness is outstanding, but coating processes and product treatment reduction, is likely to occur in coating processes
Cut or embossing, and it is possible to cause coating uneven.In consideration of it, the feature of polyester multilayer film of the present invention exists
In center line average roughness Ra is 6 to 20nm, while 10 mean roughness are 80 to 400nm.When in above-mentioned Ra and Rz
Some when being not on above range, it is also possible to because coating processes and coat it is uneven cause final products
Quality Down.
Moreover, it relates to polyester multilayer film be characterised by, at 85 DEG C be heat-treated three days after heat receipts
Shrinkage is less than 0.3%.Now, it is intended to meet the percent thermal shrinkage on the length direction and width of film, when being not in
During above range, prism film etc. is difficult to use in due to thermal deformation.
Moreover, it relates to polyester multilayer film using thermomechanical analyzer (TMA) along the length side of film
To when determining, flex point is 70 to 100 DEG C, preferably 80 to 90 DEG C.In addition, it is characterised in that at 40 DEG C, it is hot swollen between flex point
Swollen coefficient is 0.1~0.4 μm/ DEG C, and the thermal deformation length change after heat treatment at 90 DEG C is 10 to 30 μm.Now, at heat
Reason mode is as follows：Sample (wide 1cm, long 10cm) is subjected to heat treatment 3 minutes under 200g loadings with 120 DEG C, normal temperature cools down 5 points
Clock, is carried out after being heat-treated 3 minutes, normal temperature is cooled down 5 minutes under 200g loadings with 140 DEG C again.
Now, after alongst being sampled for film, when being determined using TMA, as shown in figure 1, can be swollen with heating up
Swollen after-contraction, and flex point just refers to the temperature being changed into by expansion on the position of contraction.In addition, thermal coefficient of expansion refer to according to from
The length change of 40 DEG C of temperature changes to flex point.
In addition, when carrying out TMA measure after heat treatment, the tensile strain rate (%) at 90 DEG C refers to (length change/initial
Length 16mm) × 100.
When the scope of the rate of change of the length direction after above-mentioned thermal coefficient of expansion and heat treatment exceedes above range,
Serious thermal deformation occurs in high temperature subsequent manufacturing procedure, thus commercialization is difficult to after subsequent processing operations, in hardness
Coating or during ITO sputter process, due to occurring curling or hot wrinkle, it is necessary to maturation process under extra line, it may occur that additional
Expense, time, and need pass through a procedure, thus there are problems that in technique cut or.In addition, when heat is swollen
Without thermal deformation, but it is due to thing when the scope of the rate of change in swollen coefficient and Length after heat treatment direction is less than above range
Property decline and be difficult to effect.
The manufacture for including sandwich layer and the polyester multilayer film on top layer for the present invention is not particularly limited, but can
To be cast after the extrusion molten at least two melt extruded machines, and obtained by biaxial stretch-formed.As one, squeezed at one
Extruded polyester in press, while melt extruded polyester and such as nothing of silica, kaolin, zeolite in another extruder
After the additives such as machine particle, each fused mass is after feedboard meets, and co-extrusion pressure casting, after cooling, successively biaxial drawing are real
Heat treatment and relaxation.Now, stretching, heat treatment, the relaxation of regulation film, so as to control refractive index and the contraction of film
Rate, the thermal change of film.
The manufacture method for the polyester multilayer film that one embodiment of the invention is related to comprises the following steps：
(a) melt extruded is used to form sandwich layer and each polyester and resin composition on top layer, so as to carry out co-extrusion pressure；
(b) uniaxially or biaxially stretched for the sheet material being coextruded, manufacture film；And
(c) it is heat-treated for the film being stretched,
When wherein, on the basis of film gross weight, the sandwich layer and top layer be respectively 70~90 weight % and 10~
30 weight %,
For formed the polyester and resin composition on top layer include with the intrinsic viscosity of the polyester resin for forming sandwich layer it
Difference is less than 0.15 polyester resin, and 20~100ppm average grain diameter is 0.5~5 μm of particle.
It is described the step of be heat-treated for the film that has been stretched in, can be by adjusting heat treatment temperature or edge
Length direction and width while implementing relaxation to control shrinkage factor.
Now, relaxation is characterised by, relaxation is implemented simultaneously along operating direction and width.Specifically, more
Plus preferably heat treatment step is implemented to relax along width and length direction, so as to reduce the receipts of the film through manufacture
Shrinkage.Width relaxation rate may be embodied as, in heat treatment step, 2 to 4 thermal treatment zones be divided, with similar ratio
Rate implements relaxation.If relaxation rate is too high, film is sagging, if relaxation rate is too low, the width and length of film
The shrinkage factor in direction is possible to improve, thus preferably in relaxation after division thermal treatment zone, implements different to regional
Relaxation rate.As a concrete example, thermal treatment zone is divided into after two, the relaxation rate in a certain region and another region can be made mutual
Differ.Now, more preferably relaxation for the first time when relaxation rate and the relational expression of relaxation rate during second relaxation meet
Following formula 1, this is advantageously in the shrinkage character for improving film.
Formula 1：First step relaxation rate/second step relaxation Shuai≤1.05
In addition, the shrinkage factor in order to reduce length direction, real in thermal treatment zone using the relaxation device of length direction
Relaxation is applied, now, heat treatment temperature is characterised by 80 to 240 DEG C.If the heat treatment temperature is more than 240 DEG C, film
Crystallize, it is possible to be broken, it is difficult to operate, if less than 80 DEG C, then do not relax alongst, it is impossible to
Reduce shrinkage factor.
The present invention, which is provided, includes the optical thin film of above-mentioned polyester multilayer film.
Below, in order to it is more specific explanation the present invention and illustrated for embodiment, but the present invention be not limited to as
Lower described embodiment.
Following physical property is determined by following assay method.
(1) intrinsic viscosity
By 0.4g PET particles (sample) be added to 100ml according to 6:4 weight are than mixing phenol and 1,1,2,2- tetrachloros
In the reagent of ethanol, after dissolving 90 minutes, move into Ubbelohde viscometer, after being maintained 10 minutes in 30 DEG C of thermostats, using viscous
Degree meter and air ejector (aspirator), obtain the whereabouts number of seconds of solution.The whereabouts number of seconds of solvent is obtained in the same manner
Afterwards, by mathematical expression 1 and 2, R.V values and I.V values are calculated.
C refers to the concentration of sample in following mathematical expression.
[mathematical expression 1]
The whereabouts number of seconds of whereabouts number of seconds/solvent of R.V=samples
[mathematical expression 2]
(2) transparency (mist degree, %)
Utilize haze meter (exabyte：Nipon denshoku, model NDH 5000), provided, surveyed according to JIS K 7105
Film sample is determined.Manufacture and used long 6cm, width 6cm sample.
(3) surface roughness (Ra, Rz)
Using two dimensional touch formula roughness tester (Kosaka company SE3300), determining Ra, (center line is average
Roughness) and Rz (10 mean roughness).
(4) shrinkage factor
After film sample is cut according to long 20cm, width 20cm size, after being heat-treated three days at 85 DEG C, using such as
Under formula 1, determine shrinkage factor.
Formula 1：Shrinkage factor (%)=(Length before heat treatment-Length after heat treatment)/Length before heat treatment × 100
(5) thermomechanical analyzer (TMA) is determined
Film is cut into after 16mm, 4.5mm respectively along length direction, width, using TMA (TA companies,
TMA Q400), under the initial loadings of 0.05N, according to 30~180 DEG C of temperature ranges and the bar of 5 DEG C/min programming rate
After part is heated up, thermal deformation length (Dimension change are determined：Change in size), flex point and the fat swollen coefficient of heat.
[embodiment 1]
In the core using intrinsic viscosity be 0.65 PET, in top layer using intrinsic viscosity for 0.64 PET and
80ppm average grain diameter is 1.6 μm of silicon dioxide granule, and co-extrusion pressure, is cast respectively.Hereafter, respectively along machinery side
It is stretched to after 3 times, 3.4 times, is heat-treated at 230 DEG C successively to, width, and utilizes the thermal contraction of length direction
Controller, respectively along length direction, width relaxation 1%, 2.5%, is made 188 μm of plural layers.The multi-layer thin
Film is defined the sandwich layer that 80 weight % are made, 20 weight % top layer by film gross weight.Physical property for the film of manufacture is carried out
After evaluation, shown in following table 2.
[embodiment 2]
In addition to the PET that the intrinsic viscosity for top layer is 0.64 is substituted for into the PET that intrinsic viscosity is 0.7, according to
Method same as Example 1 is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, following
Shown in table 2.
[embodiment 3]
In addition to the PET that the intrinsic viscosity for top layer is 0.64 is substituted for into the PET that intrinsic viscosity is 0.6, according to
Method same as Example 1 is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, following
Shown in table 2.
[embodiment 4]
In addition to 70 weight % sandwich layer, 30 weight % top layer are made on the basis of film gross weight, according to reality
Apply the implementation of the identical method of example 1.The plural layers thickness being made is 188 μm, after evaluating its physical property, in following table 2
In show.
[embodiment 5]
In addition to 90 weight % sandwich layer, 10 weight % top layer are made on the basis of film gross weight, according to reality
Apply the implementation of the identical method of example 1.The plural layers thickness being made is 188 μm, after evaluating its physical property, in following table 2
In show.
[embodiment 6]
Silicon dioxide granule used in by top layer by addition to 80ppm is changed to 100ppm, according to embodiment 1
Identical method is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, is shown in following table 2
Go out.
[embodiment 7]
Silicon dioxide granule used in by top layer by addition to 80ppm is changed to 5ppm, according to the phase of embodiment 1
Same method is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, is shown in following table 2.
[embodiment 8]
It it is 5 μm except the silicon dioxide granule that the average grain diameter used in top layer is 1.6 μm is changed into average grain diameter
Silicon dioxide granule beyond, implement according to method same as Example 1.The plural layers thickness being made is 188 μm, to it
After physical property is evaluated, shown in following table 2.
[embodiment 9]
It is 0.5 μ except the silicon dioxide granule that the average grain diameter used in top layer is 1.6 μm is changed into average grain diameter
Beyond m silicon dioxide granule, implement according to method same as Example 1.The plural layers thickness being made is 188 μm, right
After its physical property is evaluated, shown in following table 2.
[comparative example 1]
In addition to the PET that the intrinsic viscosity for top layer is 0.64 is replaced by into the PET that intrinsic viscosity is 0.55, according to
The identical method of embodiment 1 is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, in following table
Shown in 2.
[comparative example 2]
In addition to the PET that the intrinsic viscosity for top layer is 0.64 is replaced by into the PET that intrinsic viscosity is 0.85, according to
The identical method of embodiment 1 is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, in following table
Shown in 2.
[comparative example 3]
In addition to 60 weight % sandwich layer, 40 weight % top layer are made on the basis of film gross weight, according to reality
Apply the implementation of the identical method of example 1.The plural layers thickness being made is 188 μm, after evaluating its physical property, in following table 2
In show.
[comparative example 4]
In addition to 95 weight % sandwich layer, 5 weight % top layer are made on the basis of film gross weight, according to implementation
The identical method of example 1 is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, in following table 2
Show.
[comparative example 5]
Silicon dioxide granule used in by top layer by addition to 80ppm is changed to 110ppm, according to embodiment 1
Identical method is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, is shown in following table 2
Go out.
[comparative example 6]
Silicon dioxide granule used in by top layer by addition to 80ppm is changed to 10ppm, according to embodiment 1
Identical method is implemented.The plural layers thickness being made is 188 μm, after evaluating its physical property, is shown in following table 2
Go out.
[comparative example 7]
Implement according to method same as Example 1, and do not carry out the relaxation of length direction when manufacturing, only in width side
Upwards relaxation 2.5% and be made.The plural layers thickness being made is 188 μm, after evaluating its physical property, in following table 2
In show.
[table 1]
Is with A/B/A mode co-extrusion pressures.(skin depth is two A layers of total amount)
[table 2]
As shown in Table 2 above, multiple embodiments of the present invention meet surface roughness, transparency, based on thermal contraction
The physical property of the dimensional stability of rate, while meeting the thing of the flex point determined based on TMA, thermal coefficient of expansion and tensile strain rate
Property, it was confirmed that the high grade of transparency, low-shrinkage and outstanding surface characteristic can be realized.Which demonstrate be readily adapted for working as being used to show
The optical thin film of outstanding physical property and anufacturability can be realized when device, especially touch panel or BLU.On the contrary, comparing
In example 1,2 and 4, it is difficult to due to fracture and interfacial instability, the surface characteristic of comparative example 3 and 5 and transparent
Degree is significantly reduced, and Length after heat treatment rate of change is also compared to embodiment reduction.In addition, the transparency of comparative example 6 and 7, receipts
Shrinkage or thermal coefficient of expansion, tensile strain rate are significantly reduced.
As previously described, the present invention is explained by limited embodiment, but this is intended merely to contribute to more
The present invention is apparent from, the present invention is not limited to above-described embodiment, and those skilled in the art can be carried out to above-mentioned record
A variety of modifications and deformation.
Therefore, thought of the invention is not limited in illustrated embodiment, is not only claims, with the right
Claim is equivalent or deformation of equal value is all fallen within the category of inventive concept.
Claims (11)
- It is by carrying out formed by co-extrusion pressure and stretching more than three layers many to polyester resin 1. a kind of polyester multilayer film Layer film, it is characterised in that：When on the basis of film gross weight, including 70~90 weight % sandwich layer and 10~30 weight % are layered in the sandwich layer Two surfaces at least two layers top layer,The difference of the intrinsic viscosity of the polyester resin for forming the top layer and the polyester resin for forming sandwich layer is less than 0.15, and described Average grain diameter of the top layer comprising 20~100ppm is 0.5~5 μm of particle.
- 2. polyester multilayer film according to claim 1, it is characterised in thatThe center line average roughness (Ra) of the polyester multilayer film is 6~20nm, 10 mean roughness (Rz) are 80~ 400nm, the percent thermal shrinkage after 20cm × 20cm sample is heat-treated three days at 85 DEG C is less than or equal to 0.3%.
- 3. polyester multilayer film according to claim 1, it is characterised in thatWhen using thermomechanical analyzer (TMA) determine when, the length direction by flex point of the polyester multilayer film it is hot swollen Swollen coefficient is 0.2~0.4 μm/ DEG C, and by carrying out being heat-treated 3 minutes with 120 DEG C under 200g loadings, normal temperature is cooled down 5 minutes, then Secondary to carry out being heat-treated 3 minutes with 140 DEG C under 200g loadings, after normal temperature is cooled down 5 minutes, the change of length direction is turned at 90 DEG C 10~30 μm.
- 4. polyester multilayer film according to claim 1, it is characterised in thatThe transparency of the plural layers is 0.8~2.5%.
- 5. polyester multilayer film according to claim 1, it is characterised in thatThe gross thickness of the plural layers is 50~300 μm.
- 6. polyester multilayer film according to claim 1, it is characterised in thatThe particle is the one or two kinds of thing mixed above in silica, zeolite and kaolin.
- 7. polyester multilayer film according to claim 1, it is characterised in thatThe intrinsic viscosity for forming the polyester resin on the top layer is 0.6~0.8.
- 8. a kind of optical thin film, it is characterised in thatFormed on the top of the polyester multilayer film any one of claim 1 to 7 and be selected from hard conating, adhesive phase, light Functional coat more than any one in diffusion layer, ITO layer and printing layer.
- 9. a kind of manufacture method of polyester multilayer film, it comprises the following steps：(a) melt extruded is used to form sandwich layer and each polyester and resin composition on top layer, and carries out co-extrusion pressure；(b) sheet material Jing Guo co-extrusion pressure is uniaxially or biaxially stretched, so as to manufacture film；And(c) it is heat-treated for the film being stretched,When wherein, on the basis of film gross weight, the content of the sandwich layer is 70~90 weight %, and the content on the top layer is 10 ~30 weight %,The polyester and resin composition for forming top layer is included：And the difference for forming the intrinsic viscosity of the polyester resin of sandwich layer is less than 0.15 Polyester resin and 20~100ppm average grain diameter are 0.5~5 μm of particle.
- 10. the manufacture method of polyester multilayer film according to claim 9, it is characterised in thatThe heat treatment step includes the step for implementing relaxation along operating direction and width.
- 11. the manufacture method of polyester multilayer film according to claim 9, it is characterised in thatWhen carrying out described loose, zoning regulation relaxation rate, to meet following formula 1,Formula 1：First step relaxation rate/second step relaxation Shuai≤1.05.
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| KR10-2015-0134962 | 2015-09-23 | ||
| KR1020150134962A KR102267596B1 (en) | 2015-09-23 | 2015-09-23 | Polyester Film For Optical Film |
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| US20010038907A1 (en) * | 2000-03-27 | 2001-11-08 | Kiyokazu Hashimoto | Laminated polyester film |
| JP2002254565A (en) * | 2000-12-08 | 2002-09-11 | Toyobo Co Ltd | Optical laminated film |
| CN1565835A (en) * | 2003-07-02 | 2005-01-19 | 上海紫东化工塑料有限公司 | Polyester film with low percent thermal shrinkage and production method thereof |
| CN101605658A (en) * | 2007-02-14 | 2009-12-16 | 东丽株式会社 | Highly adhesive multilayer thermoplastic resin film |
| CN103389528A (en) * | 2012-05-08 | 2013-11-13 | 富士胶片株式会社 | Optical film, polarizer, image display device and method for manufacturing optical film |
| WO2015019977A1 (en) * | 2013-08-06 | 2015-02-12 | 帝人デュポンフィルム株式会社 | Polyester film |
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| KR100482613B1 (en) * | 1996-09-24 | 2005-04-28 | 미쯔비시 폴리에스테르 필름 게엠베하 | A single-layer or multilayer biaxially-oriented PET film and the process for the production of the film |
| WO2000063001A1 (en) * | 1999-04-19 | 2000-10-26 | Toray Industries, Inc. | Biaxially oriented polyester film, process for producing the same, and magnetic recording medium |
| JP5275849B2 (en) | 2008-04-21 | 2013-08-28 | 帝人株式会社 | Biaxially oriented multilayer laminated polyester film |
| KR101985469B1 (en) * | 2013-06-27 | 2019-06-03 | 코오롱인더스트리 주식회사 | Polyester multi-layer film and manufacturing method thereof |
| KR20150037126A (en) * | 2013-09-30 | 2015-04-08 | 코오롱인더스트리 주식회사 | Polyester multi layer film |
| KR20150074323A (en) * | 2013-12-24 | 2015-07-02 | 코오롱인더스트리 주식회사 | Polyester multi-layer film |
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| US20010038907A1 (en) * | 2000-03-27 | 2001-11-08 | Kiyokazu Hashimoto | Laminated polyester film |
| JP2002254565A (en) * | 2000-12-08 | 2002-09-11 | Toyobo Co Ltd | Optical laminated film |
| CN1565835A (en) * | 2003-07-02 | 2005-01-19 | 上海紫东化工塑料有限公司 | Polyester film with low percent thermal shrinkage and production method thereof |
| CN101605658A (en) * | 2007-02-14 | 2009-12-16 | 东丽株式会社 | Highly adhesive multilayer thermoplastic resin film |
| CN103389528A (en) * | 2012-05-08 | 2013-11-13 | 富士胶片株式会社 | Optical film, polarizer, image display device and method for manufacturing optical film |
| WO2015019977A1 (en) * | 2013-08-06 | 2015-02-12 | 帝人デュポンフィルム株式会社 | Polyester film |
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| CN107031160B (en) | 2020-01-31 |
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