KR101612082B1 - Stacked and biaxially stretched polyester film for optical use - Google Patents

Abstract

The present invention relates to a multi-layered biaxial elongated polyester film for an optical use which can increase inner tub adhesion to maintain adhesion between a solventless ultraviolet (UV) hardening resin and a polyester film of 90% or more after processing for two hours by immersing in boiling water, thereby having a uniform exterior and excellent adhesion since a resin is wet well in a primer multi-layered film.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical laminated biaxially stretched polyester film,

The present invention relates to an optical laminated biaxially stretched polyester film, and more particularly to a laminated biaxially stretched polyester film which is excellent in hydrogen bond strength by producing a primer laminated film having a specific ratio of urea bond and urethane bond to improve the spreadability of a UV- And is capable of ensuring the adhesion to the polyester substrate after processing. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an optical laminated biaxially stretched polyester film.

Generally, transparent plastic films such as polyester (PET, PEN, etc.), polycarbonate (PC), polymethyl methacrylate (PMMA), triacetyl cellulose (TAC) and amorphous polyolefin They are used as a substrate for a flat panel display such as a liquid crystal display or a plasma display display, a film for a touch panel or a film for a window. Among them, the biaxially stretched polyester film not only has excellent properties such as mechanical properties, electrical properties, dimensional stability, heat resistance, transparency and chemical resistance, but also has a general versatility and cost advantage in comparison with other transparent plastic films And is very suitably used for various purposes.

Particularly, various types of films are formed on flat panel displays, such as optical acid films and prism films. These films are produced by coating a polyester film with other materials using a material, and there is a problem in that the polyester film substrate lacks adhesion and wettability.

In order to solve this problem, conventionally, the problem has been overcome by increasing the proportion of additives or low molecular weight oligomers that can be wetted to the UV resin or processing techniques.

However, in the conventional biaxially stretched polyester film, since the solvent-based coating agent itself has low surface tension, corona treatment or the adhesive laminated film is formed on a general polyester film, and adhesion and wettability can be ensured.

On the other hand, in the case of a resin used in a UV-curing type of solventless type for making patterns such as patterns, there is a problem that the viscosity is high and the surface tension is not low so that the polyester film substrate lacks adhesion strength and wetting property.

Accordingly, a method of increasing the surface tension of a polyester film base material as opposed to a method of lowering the surface tension of a solventless UV curing type resin has been demanded. Therefore, there is a limit to lowering the surface tension of the solvent-free UV curing type resin, and therefore, there is a need for a laminated film capable of extremely increasing the surface tension of polyester.

Korean Patent Publication No. 2011-0007325 Korean Patent Publication No. 2014-0038990

Disclosure of the Invention The present invention has been made to solve the above problems, and it is an object of the present invention to provide a primer laminated film which can be well wetted with resin, spread out, uniform in appearance, excellent in adhesion, The present invention provides an optical laminated biaxially stretched polyester film which can improve the adhesion of hot water so that the adhesion between the UV-cure resin and the polyester film is maintained at 90% or more even after being treated for 2 hours.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

The above object is achieved by a primer laminated film comprising at least one surface of a base film and a base film and containing a urea bond in an amount of 10 to 80% by weight based on the total weight of the primer laminated film and having a surface tension of 50 dyne / cm or more The present invention provides an optical laminated biaxially stretched polyester film for optical use.

Here, the primer laminated film may be formed of a water dispersion coating liquid containing an isocyanate compound having 3 to 15 carbon atoms in which terminal groups have been subjected to a block treatment.

Preferably, the aqueous dispersion liquid further comprises a chain extender and particles.

Preferably, the isocyanate compound is a diisocyanate water-dispersible compound composed of an aliphatic diisocyanate or an alicyclic diisocyanate and a glycol containing an ionic chain extender, wherein the terminal isocyanate reactor is block-blocked.

Preferably, the aliphatic diisocyanate is selected from the group consisting of tetramethylene diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, 2-methylpentane-1,5-diisocyanate, 3-methylpentane- , 4-trimethylhexamethylene-1,6-diisocyanate, 2,4,4-trimethylhexamethylene-1,6-diisocyanate, and the alicyclic diisocyanate is at least one of isophorone diisocyanate, cyclohexyl diisocyanate , Hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated trimethyl xylylene diisocyanate.

Preferably, the ionic chain extender is selected from the group consisting of 2,2-dimethylolpropionic acid, 2,2-dimethylolbutanoic acid, polypropylene glycols having a sodium sulfonate group, 2,4-diamino-5-methylbenzenesulfonic acid By weight of the total polyurethane, and 0.5 to 25% by weight based on the total polyurethane.

Preferably, the glycol is selected from the group consisting of aliphatic glycols such as ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol and neopentin glycol, polyoxyalkylene glycols such as diethylene glycol, polyethylene glycol and polypropylene glycol, Alicyclic glycols such as methanol and the like, aromatic glycols such as bisphenol A and bisphenol S, and ester glycols such as neopentyl glycol hydroxypivalate.

Preferably, the glycol may be a copolymeric polytetramethylene glycol.

Preferably, the blocking agent may be acetone oxime as the oxime compound.

Preferably, the chain extender is selected from the group consisting of aromatic diamines such as tolylene diamine, xylylenediamine and diphenylmethane diamine, ethylenediamine, propylenediamine, hexanediamine, 2,2-dimethyl-1,3-propanediamine, Butyl-2-ethyl-1,5-pentanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, etc. Of an aliphatic diamine, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, dicyclohexylmethanediamine, isoprobutylcyclohexyl-4,4'-diamine, Hexane, 1,3-bisaminomethylcyclohexane, and the like.

Preferably, the particles are silica particles having an average particle diameter of 100 to 350 nm, and may contain 2 to 15% by weight based on the total weight of the water dispersion coating solution.

According to the present invention, the primer laminated film having a specific ratio of urea bond and urethane bond is prepared, whereby the hydrogen bonding force can be extremely improved to improve the spreadability of the UV curing resin of the solventless type and to secure the adhesive force with the polyester substrate after processing And the like.

Therefore, according to the present invention, it is possible to improve a clean appearance, a processing speed and an adhesive force, and it is possible to use as a substrate of a prism sheet for BLU or a resin coating for patterning.

However, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view of an optical laminated biaxially stretched polyester film according to an embodiment of the present invention; Fig.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. Also, although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described herein.

In describing and / or claiming the present invention, the term "copolymer" is used to refer to a polymer formed by copolymerization of two or more monomers. Such copolymers include binary copolymers, terpolymers, or higher order copolymers.

The optical laminated biaxially stretched polyester film according to the embodiment of the present invention comprises a urea bond in an amount of 10 to 80% by weight based on the total weight of the primer laminated film on at least one surface of the base film 11 and the base film , And a primer laminated film (12 and / or 12 ') having a surface tension of 50 dyne / cm or more.

That is, the optical laminated biaxially stretched polyester film is characterized in that it contains a urea bond and a urethane bond in order to extremely increase the hydrogen bonding force. Since the surface energy can be increased by including a urea bond having a good hydrogen bond, it is possible to form a primer laminated film having a high surface tension. When the non-solvent UV curable resin is coated on the surface of the base film thus treated, spreadability is improved because the surface tension of the base film is higher than that of the solventless UV curable resin, and adhesion is also improved.

Optical films such as antireflection films, diffusion sheets, and prism sheets used in flat panel displays often have poor adhesion when subjected to secondary processing on polyester films. Particularly, when a solventless UV curing type coating material is used, penetration into the primer layer on the surface of the substrate is difficult as compared with the solvent based coating material, resulting in insufficient adhesion. In addition, since the solventless UV resin has a high viscosity, it is required to improve wettability so that it can be uniformly coated on a polyester film substrate. In this specification, the surface tension of the laminated film is set to 50 dyne / cm or more even when a non-solvent type UV curing type resin is used, and the surface energy is increased to provide an optical laminated biaxially stretched polyester film excellent in adhesion and wetting .

The base film (11) is a biaxially stretched polyester film. The polyester obtained by polymerizing the kind of dicarboxylic acid and the glycol type is melted and supplied into a known extruder as required, To a sheet state of a single layer or a multiple layer, and is brought into close contact with the casting drum by electrostatic force or the like to form a non-stretched sheet by cooling and solidifying, followed by heat treatment after biaxial stretching.

Examples of the dicarboxylic acid used for the polyester resin include terephthalic acid, naphthalene dicarboxylic acid, isophthalic acid, diphenylcarboxylic acid, diphenylsulfone dicarboxylic acid, diphenoxyethanedicarboxylic acid, 5-sodium sulfone Aromatic dicarboxylic acids such as dicarboxylic acid and phthalic acid, aliphatic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, dimasanic acid, maleic acid and fumaric acid, cycloaliphatic dicarboxylic acids such as cyclohexanedicarboxylic acid Oxycarboxylic acids such as benzoic acid, pyroxylic acid, pyroxylic acid, and p-oxybenzoic acid. Examples of the glycol used for the polyester resin of the film include aliphatic glycols such as ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, neopentin glycol and the like, and polyoxyalkyls such as diethylene glycol, polyethylene glycol and polypropylene glycol Aromatic glycols such as bisphenol A and bisphenol S, and the like can be used. Considering mechanical strength, weatherability, chemical resistance, transparency and the like, it is preferable to use ethylene glycol as the former and terephthalic acid or naphthalene dicarboxylic acid as the former. It is preferable to use an alkaline earth metal compound, a manganese compound, a cobalt compound, an aluminum compound, an antimony compound, a titanium compound or a germanium compound as a catalyst in the polymerization. The kind of dicarboxylic acid, the kind of glycol, or the catalyst may be used in combination of two or more kinds.

In addition, particles may be added to the film raw material in order to have functions such as running property, weather resistance and heat resistance in the film, but sufficient attention should be paid to the addition amount and the material so as not to impair the transparency of the film. The addition amount is preferably an extremely small amount, more preferably no addition. As for the running property of the film, it is preferable to assist by adding particles of the laminated film as described above.

As the stretching method, known techniques such as biaxial stretching in the longitudinal direction and stretching in the transverse direction, and biaxial stretching in which stretching in the longitudinal direction and the transverse direction are simultaneously performed at the same time are used. The preheating temperature and stretching temperature before stretching are 60 to 170 占 폚, and the stretching magnification is 2.0 to 5.0 times. If necessary, heat treatment at 170 캜 to 240 캜 is performed after stretching.

In an embodiment of the present invention, a sequential biaxial stretching method of stretching in the transverse direction after longitudinal stretching is preferable.

In one embodiment of the present invention, the primer laminated film 12 and / or 12 'may be formed by a known coating method, but it is preferable to use a method of forming a coating layer during film formation. That is, in one embodiment of the present invention, it is preferable that the primer laminated film (A) having a high surface tension is carried out in the biaxial stretching film forming process at the stage before the stretching in the longitudinal direction and before the stretching in the transverse direction. As the coating method, any of various well-known coating methods such as a bar coating method using a Meyer bar, a gravure coating method, a slit die coating method, and a comma coating method may be used. However, since a water-dispersed coating liquid is used, A bar coating method is preferable.

In an embodiment of the present invention, a primer lamination layer capable of coating a coating liquid that is water-dispersed in a longitudinally stretched sheet and generating urea bonds and urethane bonds by a chemical reaction during the drawing process in the transverse direction, A film can be formed. That is, a coating liquid in which a urethane resin having an isocyanate terminal group blocked during film formation of a polyester film and glycol is dispersed in water at a predetermined ratio is coated during in-line coating, and the coating liquid is cured while being dried The urea bond and the urethane bond are formed at a specific ratio, so that the hydrogen bonding force can be extremely increased, and the surface tension of the primer laminated film after curing can be 50 dyne / cm or more.

The primer laminated film according to an embodiment of the present invention may include an isocyanate compound, a chain extender and particles having a terminal group blocked and having 3 to 15 carbon atoms, and a tin catalyst may be further used. As a result, a primer laminated film having a high surface tension can be formed.

It is preferable that the isocyanate compound is dispersed in water, and in order to disperse the water, it is necessary to react the structure which does not react with the hydroxyl group to the end of the isocyanate. A block isocyanate using a so-called block agent. It is a block isocyanate which protects the reactor of block isocyanate group from the viewpoint of liquid stability. The block is dissociated at 100 ° C or higher. The isocyanate group can react with active energy and react with water and other isocyanate groups to form a urethane bond And forms urethane bonds with the added glycols, thereby improving the surface energy.

The isocyanate-based compound is preferably a diisocyanate water-dispersible compound composed of an aliphatic diisocyanate or alicyclic diisocyanate and a glycol containing an ionic chain extender, wherein the terminal isocyanate reactor is block-blocked.

The aromatic diisocyanate and the aliphatic or alicyclic diisocyanate can be used as the isocyanate before the blocking agent treatment, but an aliphatic or alicyclic diisocyanate is preferable for enhancing the surface tension and adhering to the polyester. Specific examples include tetramethylene diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, 2-methylpentane-1,5-diisocyanate, 3-methylpentane-1,5-diisocyanate, 2,2,4-trimethylhexamethylene- 1,6-diisocyanate and 2,4,4-trimethylhexamethylene-1,6-diisocyanate, and examples thereof include isophorone diisocyanate, cyclohexyl diisocyanate, hydrogenated xylylene diisocyanate, Alicyclic diisocyanates such as hydrogenated diphenylmethane diisocyanate and hydrogenated trimethyl xylylene diisocyanate. Examples of the aromatic diisocyanate include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, xylene-1,4-diisocyanate, xylene-1,3-diisocyanate, Methane diisocyanate, 2,4'-diphenylmethane diisocyanate, 4,4'-diphenyl ether diisocyanate, 2,2'-diphenylpropane-4,4'diisocyanate, 3,3'-dimethyldiphenyl Methane-4,4'-diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, naphthalene-, 4-diisocyanate and the like.

Glycols include aliphatic glycols such as ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol and neopentin glycol, polyoxyalkylene glycols such as diethylene glycol, polyethylene glycol and polypropylene glycol, alicyclic hydrocarbons such as cyclohexanedimethanol Aromatic glycols such as glycols, bisphenol A and bisphenol S, and ester glycols such as neopentyl glycol hydroxypivalate. The glycol is preferably a copolymerized polytetramethylene glycol.

As the blocking agent, phenol, alcohol, active methylene, acid amide, lactam, acid amide, acid imide, imidazole, urea, oxime, and amine compounds can be used. More specifically, Phenol compounds such as phenol, cresol and ethylphenol; alcohol compounds such as propylene glycol monomethyl ether, ethylene glycol, benzyl alcohol, methanol and ethanol; active methylene compounds such as dimethyl malonate and acetyl acetone; , Dodecylmercaptan and the like, acid amide compounds such as acetanilide and acetic acid amide, lactam compounds such as caprolactam and valerolactam, acid imide compounds such as succinic acid imide and maleic acid imide, Oxime compounds such as acetone oxime and methyl ethyl ketoxime, amine compounds such as diphenyl aniline, aniline and ethylene imine, and sodium sulfite. And any of the blocking agents may be used, but oxime compounds are preferably used.

As the ionic chain extender for water oxidation, an anionic chain extender and a cationic chain extender may be used. As the anionic chain extender, a compound containing a carboxyl group or a sulfonate group may be used. For example, 2,2-dimethylolpropionic acid, 2,2-dimethylolbutanoic acid, polypropylene glycols having a sodium sulfonate group, and 2,4-diamino-5-methylbenzenesulfonic acid can be used. Examples of the cationic chain extender include tertiary amine diols and diamine compounds such as methyl diethanol amine. In the present invention, an anionic chain extender is more preferable, and dimethylol propionic acid is more preferable. The ionic chain extender may comprise from 0.5 to 25% by weight, preferably from 2 to 7% by weight, based on the total polyurethane.

Also, a chain extension system having two amino groups can be added, and aromatic diamines such as tolylene diamine, xylylenediamine, and diphenylmethanediamine, ethylenediamine, propylenediamine, hexanediamine, 2,2- 1-pentanediamine, 1,8-hexanediamine, 1,8-hexanediamine, 1,8-hexanediamine, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, dicyclohexylmethanediamine, isopropyricinecyclohexyl-4,4'-diamine, 1, 4-diaminocyclohexane, 1,3-bisaminomethylcyclohexane, and the like.

It is preferable that the primer laminated film (A) contains 10% by weight to 80% by weight of urea bonds. When the urea bond is less than 10% by weight, the surface tension does not exceed 40 dyne / cm, It is impossible to ensure spreadability and adhesion between the laminated film and the non-solvent type UV curable resin is not exhibited. When it exceeds 80% by weight, the surface tension can be 50 dyne / cm or more, The amount of heat required for the urethane bonding reaction is increased and the productivity is poor, and the coating film is brittle, which causes a problem in that cracks are generated in the laminated film when stretched in the transverse direction.

In order to prevent blocking, it is preferable to contain particles of 2 to 15% by weight based on the total weight of the water dispersion coating liquid forming the laminated film. If it contains less than 2% by weight of particles, blocking by moisture will occur, and if it contains more than 15% by weight of particles, it may affect the transmittance and luminance. It is also preferable to use particles having a particle size of 100 to 350 nm as the particle size to be used. If the particle size is less than 100 nm, the effect of blocking is not significant and the transmittance and brightness are reduced only when the particle size is large.

As the particle type, inorganic particles such as silica, alumina, and metal oxide, or organic particles such as crosslinked polymer particles can be used. Silica particles are preferred in order to improve the permeability and to have a good effect on the running property.

As described above, the optical laminated biaxially stretched polyester film according to the present invention comprises 10 to 80% by weight of a urea bond capable of improving the hydrogen bonding strength on at least one surface of the base film and has a surface tension of 50 dyne / cm or more, it is possible to improve clean appearance, processing speed and adhesive force by improving the spreadability of solvent-free UV curable resin, so that it can be used as a substrate for a prism sheet for BLU or a resin coating for patterning.

Hereinafter, the structure and effect of the present invention will be described in more detail with reference to examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

[Example]

The materials used in this example and the comparative example are as follows.

The block isocyanate (B1)

Dispersed isocyanate compound composed of 55% by weight of hexamethylene diisocyanate and 45% by weight of copolymerized polytetramethylene glycol containing 2,2-dimethylolpropionic acid and having an end isocyanate reactor blocked with acetone oxime

The block isocyanate (B2)

Dispersed isocyanate compound composed of 70% by weight of tetramethylene diisocyanate and 30% by weight of copolymerized polytetramethylene glycol containing 2,2-dimethylolpropionic acid and having a terminal isocyanate reactor blocked with acetone oxime

The water-dispersed urethane resin (B3)

A water-dispersed urethane resin compound in which a polyurethane resin composed of 55% by weight of a polyester polyol derived from adipic acid and 1,4-butanediol, 2,2-dimethylolpropionic acid, and 45% by weight of toluylene diisocyanate was neutralized with triethylamine

The water-dispersed urethane resin (B4)

A polyurethane resin composed of 55% by weight of a polyester polyol derived from adipic acid and 1,4-butanediol, 2,2-dimethylolpropionic acid and 45% by weight of xylene-1,4-diisocyanate was neutralized with triethylamine, Urethane resin compound

The chain extender (C1)

Cyclohexanedimethanol

The chain extender (C2)

1,3-Bisaminomethylcyclohexane

Particles (P1)

A silica sol aqueous dispersion having an average particle size of 150 nm

[Example 1-4]

Polyethylene terephthalate not containing a filler was melt-extruded at 280 DEG C and cast on a cooling drum of an electrostatically applied 20 DEG C to prepare an unleaded sheet. The sheet was preheated to 100 DEG C, And then stretched 3.0 times to prepare a uniaxially stretched film. Thereafter, an aqueous dispersion (B) for preparation of a laminated film (A) was coated on both surfaces of the uniaxially stretched film, followed by preheating for 2 minutes at 120 DEG C, stretching 3.5 times in the transverse direction at 150 DEG C, To obtain an optical laminated polyester film on which the polyester (A) was formed.

The components and the contents in the following Table 1 were used for the aqueous dispersion (B) for preparing the laminated film (A).

[Comparative Example 1-4]

An optical laminated polyester film was obtained in the same manner as in Example 1 except that the components and the contents in Table 1 were used.

division Coating composition (B) Composition ratio (% by weight) Example 1 B1 / C1 / P1 70/25/5 Example 2 B1 / C2 / P1 80/15/5 Example 3 B2 / C1 / P1 60/35/5 Example 4 B2 / C2 / P1 85/10/5 Comparative Example 1 B3 / C1 / P1 80/15/5 Comparative Example 2 B3 / C2 / P1 85/10/5 Comparative Example 3 B4 / C1 / P1 80/15/5 Comparative Example 4 B4 / C2 / P1 60/35/5

The properties of the biaxially stretched polyester films for optical films according to Examples 1 to 4 and Comparative Examples 1 to 4 were measured through the following experimental examples and the results are shown in Table 2 below.

[Experimental Example]

(1) Evaluation of adhesion strength at room temperature

On the laminated film (A) of the laminated biaxially stretched polyester film, a solvent-free UV curable resin containing 95% by weight of urethane acrylate resin and 5% by weight of a UV initiator was immediately coated and then cured with a UV metal lamp of 300 mJ strength. The biaxially stretched polyester film laminated with the UV resin was cut into 100 pieces of 100 mm x 100 mm and then pressed with a rubber roller using a Nitto 31B tape, and the adhesive force was evaluated by the number of times when the tape was peeled off and peeled off. Adhesion was evaluated by the following criteria.

Adhesion 5: Over 95% adhesion, within 5%

Attachment 4: Attachment of 90% or more, dropping within 10%

Adhesion 3: Over 80% adhesion, within 20%

Attachment 2: Attachment of 70% or more, dropping within 30%

Attachment 1: 30% or more eliminated.

(2) Evaluation of internal bath adhesion

On the laminated film (A) of the laminated biaxially stretched polyester film, solventless UV curable resin containing 95% by weight of a urethane acrylate resin and 5% by weight of a UV initiator was immediately coated and then cured to a UV metal lamp of 300 mJ strength. 100 pieces of the biaxially stretched polyester film laminated with the UV resin were cut in a size of 100 mm X 100 mm, and the film was placed in hot water (100 ° C) for 2 hours. The film piece was taken out and dried. , And the adhesive force was evaluated by the number of times when the tape was peeled off and peeled off. Adhesion was evaluated by the following criteria.

Adhesion 5: Over 95% adhesion, within 5%

Attachment 4: Attachment of 90% or more, dropping within 10%

Adhesion 3: Over 80% adhesion, within 20%

Attachment 2: Attachment of 70% or more, dropping within 30%

Attachment 1: 30% or more eliminated.

(3) Contact angle measurement

1 g of a solvent-free UV curable resin containing 95% by weight of a urethane acrylate resin and 5% by weight of a UV initiator was dropped on the laminated film (A) of the laminated biaxially stretched polyester film and then developed at the boundary between the laminated film (A) The contact angle was measured. The lower the contact angle, the better the spreadability.

(4) Content of urea bond

The coating liquid constituting the laminated film (A) was dried under reduced pressure at 80 占 폚 and then heat-treated in an oven at 240 占 폚 for 10 minutes and then subjected to NMR (AVANCEIII600, manufactured by Bruker Biospin Co., Ltd.) and FTIR 8400-S spectrometer urea-C = O peak, urethane-C = O peak and -NCO peak.

(5) Solid surface tension

를 사용하여 측정하였다. 단위는 "dyne/cm"이다.The contact angle was measured using a water contact angle machine (Dropmaster 300, manufactured by KYOWA INTERFACE SCIENCE Co., Ltd.) and diiodomethane, and the OWRK / Fowkes equation

. The unit is "dyne / cm".

division Reactor measurement (*) solid
Surface tension Contact angle measurement Room temperature
Adhesion Hot water
Adhesion Example 1 35 55 9 5 5 Example 2 45 58 8 5 5 Example 3 20 52 10 5 5 Example 4 40 58 8 5 5 Comparative Example 1 0 37 40 2 One Comparative Example 2 0 37 39 2 2 Comparative Example 3 0 38 42 2 2 Comparative Example 4 0 36 39 2 One

* Reactor measurement (*): wt% of urea-C = O relative to the total constituent components of the primer laminated film

As can be seen in Table 2, in Examples 1 to 4 using the block-treated water-dispersed isocyanate and the chain extender, the solid surface tension was 50 dyne / cm or more and the contact angle with the solventless UV curable resin was about 10 And the adhesion at room temperature and the resistance to hot water are secured. On the other hand, it can be seen that the weight percentage of urea bonds is reduced as in Example 1 and Example 3 because urethane bonds are formed more than urea bonds as the chain extender is added to block-treated water-dispersed isocyanate.

On the other hand, in Comparative Examples 1 to 4, it is understood that the urethane bond as the water-dispersed urethane resin has a surface tension of 40 dyne / cm or less and a relatively high contact angle, which means that the spreadability is relatively poor. It can be seen that there may be external defects and adhesion is relatively low.

As described above, the present invention improves the adhesion with UV-curing resin of the solventless type and the spreadability upon application and improves the appearance and adhesion of the composition compared to conventional products. Therefore, the present invention can provide a prism- Can be suitably used. Not only the adhesion is improved but also the spreadability is very good and the processing speed of the prism sheet can be improved. Of course, since patterning can be formed on the surface as well as the prism molding, it is suitable for all members requiring high transparency and low haze Of course.

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

11: base film
12, 12 ': laminated film

Claims (11)

A base film,
Wherein at least one surface of the substrate film is composed of an isocyanate compound having 3 to 15 carbon atoms and comprising an aliphatic diisocyanate or a glycol having an alicyclic diisocyanate and an ionic chain extender, And a primer laminated film formed of a water-dispersed coating liquid containing a treated diisocyanate water-dispersed compound,
And a primer laminated film comprising a urea bond of 10 to 80 wt% based on the total weight of the primer laminated film and having a surface tension of 50 dyne / cm or more. delete The method according to claim 1,
Wherein the water-dispersed coating liquid further comprises a chain extender and particles. delete The method according to claim 1,
The aliphatic diisocyanate is at least one compound selected from the group consisting of tetramethylene diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, 2-methylpentane-1,5-diisocyanate, 3-methylpentane-1,5-diisocyanate, 2,2,4- Hexamethylene-1,6-diisocyanate, and 2,4,4-trimethylhexamethylene-1,6-diisocyanate,
Wherein the alicyclic diisocyanate is at least one of isophorone diisocyanate, cyclohexyl diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated trimethyl xylylene diisocyanate. Laminated biaxially stretched polyester film. The method according to claim 1,
The ionic chain extender may be at least one selected from the group consisting of 2,2-dimethylol propionic acid, 2,2-dimethylolbutanoic acid, polypropylene glycols having a sodium sulfonate group and 2,4-diamino-5-methylbenzenesulfonic acid By weight based on the total polyurethane, and 0.5 to 25% by weight based on the total polyurethane. The method according to claim 1,
The glycol may be at least one selected from the group consisting of aliphatic glycols such as ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol and neopentin glycol, polyoxyalkylene glycols such as diethylene glycol, polyethylene glycol and polypropylene glycol, alicyclic hydrocarbons such as cyclohexanedimethanol An aromatic glycol such as glycols, bisphenol A, and bisphenol S, and an ester glycol such as neopentyl glycol hydroxypivalate. The method according to claim 1,
Wherein the glycol is a copolymerized polytetramethylene glycol. The method according to claim 1,
Wherein the block agent is an acetone oxime as an oxime compound. The method of claim 3,
Examples of the chain extender include aromatic diamines such as tolylene diamine, xylylenediamine and diphenylmethanediamine, aromatic diamines such as ethylenediamine, propylenediamine, hexanediamine, 2,2-dimethyl-1,3-propanediamine, , Aliphatic diamines such as 5-pentanediamine, trimethylhexanediamine, 2-butyl-2-ethyl-1,5-pentanediamine, 1,8-octanediamine, 1,9- 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, dicyclohexylmethanediamine, isopropyricinecyclohexyl-4,4'-diamine, 1,4-diaminocyclohexane, 3-bisaminomethylcyclohexane, and 3-bisaminomethylcyclohexane. The optical laminated biaxially stretched polyester film for optical use according to claim 1, The method of claim 3,
Wherein the particles are silica particles having an average particle diameter of 100 to 350 nm and comprising 2 to 15% by weight based on the total weight of the water dispersion coating liquid.

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