KR20170090919A - Preparing water resistant polyester film - Google Patents
Preparing water resistant polyester film Download PDFInfo
- Publication number
- KR20170090919A KR20170090919A KR1020160011896A KR20160011896A KR20170090919A KR 20170090919 A KR20170090919 A KR 20170090919A KR 1020160011896 A KR1020160011896 A KR 1020160011896A KR 20160011896 A KR20160011896 A KR 20160011896A KR 20170090919 A KR20170090919 A KR 20170090919A
- Authority
- KR
- South Korea
- Prior art keywords
- polyester
- film
- primer layer
- weight
- coating liquid
- Prior art date
Links
Classifications
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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
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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
- B32B27/06—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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
- B32B2038/0028—Stretching, elongating
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
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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
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
Abstract
The present invention relates to a process for producing a polyester film, comprising the steps of: preparing a coating liquid containing a polyethylene naphthalate (PEN) polyester resin; applying the coating liquid to one or both surfaces of a polyester base film to form a primer layer; And biaxially stretching the base film. The present invention also provides a method for producing a polyester film having improved water resistance.
The present invention maintains this adhesion with the top coating, has a high refractive index, generates less rainbow, has excellent heat resistance and water resistance, prevents blocking, and enables film recycling.
Description
The present invention relates to a process for producing a polyester film having a primer layer comprising a polyethylene naphthalate (PEN) polyester aqueous dispersion.
In general, the polyester film is excellent in dimensional stability, thickness uniformity, and optical transparency, and is widely used as a material for various industrial materials as well as display devices. Particularly, as interest in liquid crystal display devices, organic light emitting display devices, and electronic paper has increased recently, researches for replacing substrates of these display devices with polyester films instead of glass substrates have been actively conducted. This is because replacing a glass substrate with a polyester film can reduce the overall weight of the display device, provide flexibility in design, be strong against impact, and can be manufactured in a continuous process, resulting in higher productivity than a glass substrate .
BACKGROUND OF THE INVENTION [0002] The present invention relates to a film, in particular, among various uses thereof. Currently, a polyester film which is industrially produced is widely used as a base film for magnetic recording media, various packaging materials and other industrial applications, It is used as material and various post processing materials.
Conventional optical and industrial polyester films are formed by coating urethane or acrylic resin on the primer layer on the polyester base film. Polyurethane based polymer resins have relatively high dimensional stability, but generate severe rainbow, and yellowing occurs in a high temperature environment. In addition, when the acrylic resin is coated, the adhesion to the hard coating on the primer is not excellent.
The present invention provides a method for producing a polyester film having a primer layer comprising a polyethylene naphthalate (PEN) polyester aqueous dispersion excellent in heat resistance and water resistance, and a polyester film having improved rainbow and yellowing Of the present invention.
In order to achieve the above object, the present invention provides a method of producing a coating liquid, comprising: preparing a coating liquid containing a polyethylene naphthalate (PEN) based polyester resin;
Applying the coating liquid to one side or both sides of the polyester base film to form a primer layer;
And biaxially stretching the polyester base film on which the primer layer is formed. The present invention also provides a method for producing a polyester film having improved water resistance.
The present invention also provides a method for producing a polyester film having improved water resistance, characterized in that the biaxial stretching is simultaneously carried out in an axial stretching step.
The present invention uses a polyethylene naphthalate-based polyester resin excellent in heat resistance and water resistance to prevent the occurrence of rainbow due to a high refractive index while maintaining the adhesiveness and to prevent blocking easily caused by urethane resin due to excellent heat resistance and water resistance, To produce a recyclable polyester film.
Hereinafter, the present invention will be described.
The method for producing a polyester film of the present invention comprises the steps of: preparing a coating liquid containing a polyethylene naphthalate-based polyester resin; Comprising the steps of: applying the coating liquid to one or both surfaces of a polyester film to modify the primer layer; and biaxially stretching the polyester base film having the primer layer formed thereon.
The primer layer is characterized in that the primer layer is applied with a coating liquid comprising a polyethylene naphthalate-based polyester resin, a melanin-based or epoxy-based curing agent, an anionic surfactant and inorganic particles.
The present invention overcomes the rainbow phenomenon and the yellowing phenomenon of the conventional urethane resin and the low adhesiveness of the acrylic resin, and the primer layer includes a polyethylene naphthalate-based polyester resin.
The polyethylene naphthalate-based polyester resin contains two benzene rings and an aliphatic polymer in a molecular structure at the same time, thereby improving heat resistance and water resistance. The polyethylene naphthalate-based polyester resin is preferably soluble or dispersible in water.
The coating liquid for forming the primer layer may contain 10 to 90 wt% of an aqueous dispersion liquid composed of 70 to 80 wt% of water and 20 to 30 wt% of water-dispersed polyethylene naphthalate-based polyester resin, , Preferably 15 wt% to 50 wt%, and more preferably 15 wt% to 40 wt%. If it is out of the range of 10 wt% to 90 wt%, it is not suitable for film coating. By changing the mixing ratio of the water-dispersed polyethylene naphthalate-based polyester resin and water, it is possible to find an optimal condition for adhesion and deterioration of yellowing. More details of this will be understood with reference to the following embodiments.
The coating liquid may further contain a curing agent, a surfactant, silica and the like commonly used in the art.
A method of biaxially stretching a polyester base film having the primer layer formed thereon is a method of stretching an unoriented sheet in a longitudinal direction (MD) and a transverse direction (TD) of the film, A method of stretching in the width direction after stretching, a method of stretching in the longitudinal direction after stretching in the width direction, and a simultaneous biaxial stretching method of stretching in the longitudinal direction and the width direction at the same time. Among them, the simultaneous biaxial stretching method is applied. The simultaneous biaxial stretching method is preferable because the stretching stress can be minimized as compared with the axial differential stretching method. The stretching temperature is suitably in the range of 40 to 120 占 폚. The stretching ratio is preferably 2.0 to 4.0 times in the longitudinal and transverse directions, respectively.
After the simultaneous biaxial stretching, the film is subjected to heat treatment. The heat treatment temperature of the film is suitably in the range of 200 to 245 ° C.
Hereinafter, the present invention will be described concretely with reference to Examples. However, the following Examples are merely illustrative of one embodiment of the present invention, and the scope of the present invention is not limited by the following Examples.
Example
Examples 1 to 3 (using a PEN (polyethylene naphthalate) polyester resin as a binder)))
For the production of the polyester film constituting the primer layer of the present invention, an unstretched polyester film is used as a base film, and a coating liquid for forming a primer layer is prepared by mixing 70 to 80% by weight of water with a polyethylene naphthalate- 20% by weight of an aqueous dispersion containing 20% by weight to 30% by weight of water, 70% by weight of water and 30% by weight of melamine curing agent, 5% by weight of water dispersion and 63.9% by weight of water, And 10% by weight of an anionic surfactant, 5% by weight of an inorganic particle water dispersion composed of 1.0% by weight of a surfactant aqueous dispersion, 30% by weight of water and 70% by weight of silica particles and a residual amount of water to prepare a coating liquid And then applied to the unstretched polyester base film having a thickness of 100 mu m to prepare a polyester film. The application of the coating liquid was applied using a # 3 wire bar. The film was stretched three times in the longitudinal direction and in the transverse direction simultaneously by biaxial stretching using the tubular system. This stretched film was thermally fixed at a temperature of 220 캜.
Comparative Example (only polyurethane resin was used as a binder)
20.0% by weight of a binder resin composed of 70% by weight of water and 30% by weight of a polyurethane resin (see Table 2) as a binder resin, 5% by weight of a curing agent aqueous dispersion consisting of 70% by weight of water and 30% by weight of a melamine curing agent % Of water and 63.9% by weight of water were mixed and an aqueous dispersion of inorganic particles consisting of 1.0% by weight of a surfactant aqueous dispersion composed of 90% by weight of water and 10% by weight of anionic surfactant and 30% by weight of water and 70% 5% by weight of water and a residual amount of water to prepare a coating liquid, and then applied to an unstretched polyester base film of the above-mentioned example having a thickness of 100 탆 to prepare an optical polyester film. The application of the coating liquid was applied using a # 3 wire bar. The film was stretched three times in the longitudinal direction and in the transverse direction simultaneously by biaxial stretching using the tubular system. This stretched film was thermally fixed at a temperature of 220 캜.
Experimental Example
Physical properties of the polyester films according to Examples 1 to 3 and Comparative Examples were measured through the following experimental examples, and the results are shown in Table 3 below.
1. Measurement of coating layer thickness
The thicknesses of the coating layers of the polyester films prepared in Examples 1 to 3 and Comparative Examples were measured using a pressure-sensitive meter (Mitsutoyo, Model: ID-Ff125) using a micrometer, (Μm) of the transparent base film was subtracted from the value obtained by subtracting the thickness (μm) of the transparent base film.
2. Measurement of refractive index
Since the refractive index of the coating layer of the polyester films prepared in Examples 1 to 3 and Comparative Examples was difficult to measure on the polyester film, the coating liquid was coated on a Si wafer and the refractive index was measured using Ellipsometry.
3. Confirmation of adhesion (adhesion)
The adhesion between the base material and the primer layer of the polyester film produced in Examples 1 to 3 and Comparative Examples was measured. Using a # 20 wire bar, an acrylic UV curable resin was applied to the surface to which the primer layer was adhered, and a cut line was formed on the film coated with the primer layer with a cutter, and 2 mm x 2 mm squares were arranged in a matrix of 10 x 10 mm. A cellophane tape (No. 205, made by NICHIBAN, width: 24 mm) was attached to the cut line film, and the tape was rubbed on the polyester film using a velvet tape, and then the tape was vertically peeled off. The area of the primer layer remained in the adhesion was visually observed, and the adhesive force was calculated by the following equation (1).
Equation 1
Also, an adhesion test for evaluation of moisture resistance after 96 hours at 60 占 폚 and 90% humidity was carried out in the same manner as described above.
4. Check coating property
In Examples 1 to 3 and Comparative Examples, the coating properties between the primer layer coating liquid and the substrate were measured. The primer layer was applied to the substrate using 0 # to 6 # wire bar to confirm whether the primer layer was coated on the entire surface of the substrate. It was evaluated that the coatability was excellent when there were two or less portions of the small untreated portions (1 square: 1 x 1 mm) of the uncoated portion like the island.
5. Confirm Haze / light transmittance
The coating solutions prepared in Examples 1 to 3 and Comparative Examples were applied to a polyester film of 188 μm and thermally cured, and haze and transmittance were measured using a haze meter manufactured by NIPPON DENSHOKU.
(μm)
(O: good,?: Normal, X: poor)
As shown in Table 3, instead of the primer layer containing a polyurethane resin, a primer layer comprising a polyethylene naphthalate-based polyester resin was constituted to have a low refractive index and a low rainbow appearance, It was confirmed that it is possible to produce a film having improved adhesion.
Claims (2)
Applying the coating liquid to one side or both sides of the polyester base film to form a primer layer;
And a step of biaxially stretching the polyester base film on which the primer layer is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160011896A KR20170090919A (en) | 2016-01-29 | 2016-01-29 | Preparing water resistant polyester film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160011896A KR20170090919A (en) | 2016-01-29 | 2016-01-29 | Preparing water resistant polyester film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20170090919A true KR20170090919A (en) | 2017-08-08 |
Family
ID=59652953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020160011896A KR20170090919A (en) | 2016-01-29 | 2016-01-29 | Preparing water resistant polyester film |
Country Status (1)
| Country | Link |
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| KR (1) | KR20170090919A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220052425A (en) * | 2020-10-20 | 2022-04-28 | 도레이첨단소재 주식회사 | Polyester film for display protection |
-
2016
- 2016-01-29 KR KR1020160011896A patent/KR20170090919A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220052425A (en) * | 2020-10-20 | 2022-04-28 | 도레이첨단소재 주식회사 | Polyester film for display protection |
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