WO2019004326A1 - Primer composition, aqueous liquid, base film with primer layer, prism sheet, and use as primer composition - Google Patents

Abstract

The present invention addresses the problem of providing a primer composition for forming a primer layer which has excellent adhesiveness to both a base film and a coating layer and which neither migrates nor fuses to an untreated surface of the base film and has excellent blocking resistance. The present invention relates to a primer composition which comprises a (meth)acrylamide compound (A) and a crosslinking agent (B).

Description

Primer composition, aqueous liquid, substrate film with primer layer, prism sheet and use as primer composition

The present invention relates to a primer composition, and more specifically, to a primer composition for forming a primer layer on a substrate film, an aqueous liquid using the primer composition, a substrate film with a primer layer, a prism sheet and a primer It relates to the use as a composition.

Conventionally, synthetic resins are widely used as resins for various substrates because they have excellent properties such as dimensional stability, mechanical properties, heat resistance, transparency, electrical properties, and chemical resistance. For example, polyester films are used in various fields in the industrial field such as packaging materials, magnetic cards, printing materials, etc. As the polyester films, thermoplastic polyesters such as polyethylene terephthalate (PET) and copolymers thereof Furthermore, after mixing and extruding what mixed other resin as needed, what was biaxially stretched and heat-fixed is used. Such a polyester film is excellent in various physical properties, but on the other hand, there is a problem that the surface is highly crystallographically oriented, so that the adhesion with a coating layer provided on the film is poor.

Therefore, in order to improve the adhesion between the polyester film and the coating layer, studies have been made to give adhesion to the film surface. For example, the film surface is subjected to easy adhesion treatment, and primer layers made of various resins are used. The method of providing is known.

One of the coating layers is, for example, a prism layer, and a prism sheet provided with a polyester film and a prism layer is used in a display device such as a television, a personal computer, a mobile phone or the like.

As a method for forming a prism layer, for example, an active energy ray curable resin composition is introduced into a prism type, and active energy ray is irradiated in a state where the active energy ray curable resin composition is sandwiched between a prism type and a polyester film. And curing the resin composition and removing the prism type to form a prism layer formed by curing the active energy ray curable resin composition on the polyester film.

In such a method, it is necessary to use a solventless active energy ray-curable resin in order to form a prism pattern finely.
However, the solventless resin has a lower penetration and swelling effect on the primer layer laminated on the polyester film than the solvent-based resin, and a layer formed by curing of the active energy ray-curable resin composition and the primer layer Adhesiveness with is likely to be inadequate.

Therefore, as a technique for improving the adhesion between the polyester film and the prism layer, for example, Patent Document 1 proposes a technique for forming a primer layer with a coating solution containing a (meth) acrylate compound and an isocyanate compound. There is disclosed a laminated polyester film having a coating layer formed from a coating solution containing a (meth) acrylate compound and an isocyanate compound on at least one side of the polyester film.

Japanese Patent Application Laid-Open No. 2014-133401

Since the base film provided with the primer layer is wound and stored, the untreated surface of the base film is in contact with the surface of the primer layer, but both come in close contact at the contact surface, and the base provided with the primer layer The material films may not be easily separated from each other, or the primer layer may be transferred or fused to the untreated surface of the base film. Therefore, blocking resistance is also required so that excessive adhesion between the primer layer surface of the base film and the untreated surface does not occur.

In the technique of Patent Document 1, the adhesion effect with the prism layer is shown. On the other hand, for blocking resistance, a method of adding fine particles of silica or the like to a primer coating is described, but when fine particles are added to the primer, stability of the coating, transparency of the coating, prism layer and the like In some cases, the adhesion and the like deteriorate, and even if the fine particles are added, the blocking resistance may not be sufficient, and a method for improving the blocking resistance that does not rely solely on the fine particles has been necessary.

Under such background, the present invention relates to adhesion to both a substrate film and a coating layer, particularly to both a polyester film and a prism layer formed by curing of a solventless active energy ray curable resin composition. It is an object of the present invention to provide a primer composition for forming a primer layer which is excellent and which is not transferred or fused to an untreated surface of a substrate film and which is also excellent in blocking resistance.

As a result of repeated investigations to solve the above problems, the inventors have found that the above problems can be solved by using a primer composition containing (meth) acrylamides and a crosslinking agent, and to complete the present invention. It reached.

That is, the present invention is characterized by the following (1) to (14).
(1) Primer composition containing (meth) acrylamides (A) and a crosslinking agent (B).
(2) The said crosslinking agent (B) is an isocyanate type compound, an oxazoline type compound, an epoxy type compound, a carbodiimide type compound, an amine type compound, a metal type compound, an aziridine type compound, a hydrazine type compound, a hydrazide type compound, and a melamine type compound The primer composition according to the above (1), which is at least one compound selected from the group consisting of
(3) The primer composition as described in said (1) or (2) whose said (meth) acrylamides (A) are hydroxyl-containing (meth) acrylamides.
(4) The primer composition according to any one of the above (1) to (3), wherein the carbon-carbon double bond content in the (meth) acrylamides (A) is 1 to 40% by mass. .
(5) In any one of the above (1) to (4), wherein the carbon-carbon double bond content of (meth) acrylamides (A) in the primer composition is 0.5 to 35% by mass. Primer composition as described.
(6) In any one of the above (1) to (5), the content ratio (mass ratio) of the (meth) acrylamides (A) to the crosslinking agent (B) is 10:90 to 90:10. Primer composition as described.
(7) The primer composition according to any one of the above (1) to (6), which further comprises a binder resin (C).
(8) The primer composition as described in said (7) whose said binder resin (C) is polyester-based resin.
(9) The primer composition according to (7) or (8) above, wherein the content of the binder resin (C) in the primer composition is 1 to 70% by mass.

(10) An aqueous liquid comprising the primer composition according to any one of the above (1) to (9) dissolved or dispersed in an aqueous solvent.
(11) A substrate film provided with a primer layer having a primer layer comprising the primer composition according to any one of the above (1) to (9) on a substrate film.
(12) A prism sheet having a prism layer on the primer layer of the substrate film with a primer layer described in (11) above.
(13) The prism sheet according to (12), wherein the prism layer is a cured product of a solventless active energy ray curable resin composition.
(14) Use of a composition containing (meth) acrylamides (A) and a crosslinking agent (B) as a primer composition.

According to the present invention, in addition to the adhesion between the substrate film and the coating layer, it is possible to obtain a primer layer excellent in blocking resistance, in which the primer layer does not migrate or fuse to the untreated surface of the substrate film. A primer composition can be provided. Therefore, a substrate film with a primer layer having a primer layer comprising the primer composition of the present invention is suitably used as a sheet having a coating layer provided on a film such as a prism sheet, a label sheet, a printing sheet or a hard coat film. It can be used.

Hereinafter, the present invention will be described in detail.
In the present invention, (meth) acrylamide means acrylamide or methacrylamide, (meth) acrylate means acrylate or methacrylate, and (meth) acryloyl group means methacryloyl group or acryloyl group.
Further, in the present invention, the term "sheet" conceptually includes sheets, films, and tapes.
In the present invention, "mass" is synonymous with "weight".

<Primer composition>
The primer composition of the present invention contains (meth) acrylamides (A) and a crosslinking agent (B).
Each component will be described below.

<(Meth) acrylamides (A)>
The primer composition of the present invention contains (meth) acrylamides (A).
For example, when the primer composition of the present invention is used to form a primer layer provided between a substrate film and a coating layer using a prism layer formed by curing of a solventless active energy ray curable resin, The (meth) acryloyl group in the (meth) acrylamides (A) reacts with the double bond in the coating layer upon curing of the solventless active energy ray-curable resin. Therefore, the primer layer obtained from the primer composition of this invention is excellent in the adhesiveness of a base film and a coating layer. Furthermore, when the amide group in (meth) acrylamides (A) has high polarity, the adhesion is further improved.

Moreover, the blocking resistance of the primer layer obtained from the primer composition of this invention improves by the hydrogen bond of the amide groups between molecules. Furthermore, when (meth) acrylamides (A) has a hydroxyl group and the crosslinking agent (B) is an isocyanate compound described later, the hydrogen bond between the urethane bond site and the amide group generated by the reaction of the hydroxyl group and the isocyanate group And the blocking resistance is further improved.

Examples of the (meth) acrylamides (A) include monofunctional (meth) acrylamide, bifunctional (meth) acrylamide, trifunctional or higher polyfunctional (meth) acrylamide, and the like, and one or more of these are used.

Examples of monofunctional (meth) acrylamides include (meth) acrylamides, dimethyl (meth) acrylamides, diethyl (meth) acrylamides, (di) alkyl (meth) acrylamides such as N-isopropyl (meth) acrylamide, and N-methoxymethyl. Alkoxyalkyl (meth) acrylamides such as (meth) acrylamide, Nn-butoxymethyl (meth) acrylamide, N-i-butoxymethyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide Amino group-containing (meth) acrylamide such as quaternary methyl chloride, ketone group-containing (meth) acrylamide such as diacetone (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-hydride Kishiechiru (meth) hydroxyl group-containing acrylamide, (meth) acrylamide, and other, and (meth) acryloyl morpholine and the like.

Examples of difunctional (meth) acrylamides include N, N′-methylenebis (meth) acrylamide and the like, and representative commercial products include “FAM-201” manufactured by Fujifilm Corporation, etc. .

Examples of trifunctional or higher polyfunctional (meth) acrylamides include representative commercial products such as “FAM-301”, “FAM-401”, and “FAM-402” manufactured by Fujifilm Corporation.

The (meth) acrylamides (A) used in the present invention is preferably a compound having an acrylamide group from the viewpoint of adhesion to a solventless active energy ray curable resin and the like preferably used as a prism resin. Further, from the viewpoint of blocking resistance, the (meth) acrylamides (A) contain a functional group such as a hydroxyl group, an amino group, a carboxyl group, an epoxy group or a ketone group, and are further reactive with the crosslinking agent (B). It is preferable to contain the group which has these, It is preferable to have especially a hydroxyl group, a carboxyl group, and a ketone group, and it is more preferable to have a hydroxyl group.

In particular, a hydroxyl group-containing (meth) acrylamide having a hydroxyl group is most preferable in terms of the reactivity with the crosslinking agent (B) and the adhesion with the solventless active energy ray curable resin.
Examples of hydroxyl group-containing (meth) acrylamides include N-methylol (meth) acrylamide and N-hydroxyethyl (meth) acrylamide. Among them, N-hydroxyethyl (meth) acrylamide is preferable.

The hydroxyl value of the hydroxyl group-containing (meth) acrylamides is preferably 20 to 800 mg KOH / g, particularly 50 to 700 mg KOH / g, and further preferably 100 to 600 mg KOH / g. If the hydroxyl value is too small, the adhesion to a solventless active energy ray curable resin and the like tend to decrease, and if it is too large, the water resistance of the primer layer tends to decrease.
In addition, said hydroxyl value is the value measured according to JISK1557.

As the (meth) acrylamides (A), it is preferable to use low molecular weight compounds which are likely to be unevenly distributed on the surface of a coating film made of a primer composition, from the viewpoint of adhesion to solventless active energy ray curable resins etc. The weight average molecular weight of the (meth) acrylamides (A) is preferably 10,000 or less, particularly 1,000 or less, more preferably 500 or less, particularly preferably 200 or less. The lower limit of the weight average molecular weight is usually 70. If the weight average molecular weight is too large, the adhesion to the solventless active energy ray curable resin tends to be lowered.

In the present invention, the weight average molecular weight and the number average molecular weight are the weight average molecular weight and the number average molecular weight in terms of standard polystyrene molecular weight, and high performance liquid chromatography (Tosoh Corp., "HLC-8320GPC"), column: TSKgel SuperMultipore HZ-M (exclusion limit molecular weight: 2 × 10 ⁶ , theoretical plate number: 16,000 plates / body, filler material: styrene-divinylbenzene copolymer, filler particle diameter: 4 μm) using two-piece series It is measured by

In addition, monofunctional (meth) acrylamide or bifunctional (meth) acrylamide is preferable, and monofunctional (meth) acrylamide is particularly preferable, because it is easily localized on the surface of a coating film made of the primer composition.

Further, the carbon-carbon double bond content in the (meth) acrylamides (A) is preferably 1 to 40% by mass from the viewpoint of adhesion to a solventless active energy ray curable resin etc. . Specifically, the lower limit is preferably 1% by mass or more, particularly preferably 2% by mass or more, more preferably 3% by mass or more, and particularly preferably 5% by mass or more. When the content of the carbon-carbon double bond is too small, the adhesion to the solventless active energy ray curable resin tends to be lowered.

The carbon-carbon double bond content in the (meth) acrylamides (A) is calculated by the following formula (I).
Carbon-carbon double bond content (mass%) in (meth) acrylamides (A) = (100 × 27 × P1 _n ) / P1 _mw Formula (I)
In the formula (I), P1 _n is the number of carbon-carbon double bonds per molecule of (meth) acrylamides (A), and P1 _mw is the molecular weight (g / mol) of (meth) acrylamides (A) .

Furthermore, in the present invention, the carbon-carbon double bond content of (meth) acrylamides (A) in the primer composition is preferably 0.5 to 35% by mass. Specifically, the lower limit is preferably 0.5% by mass or more, particularly preferably 1% by mass or more, more preferably 2% by mass or more, and particularly preferably 4% by mass or more. When the content of the carbon-carbon double bond is too small, the adhesion to the solventless active energy ray curable resin tends to be lowered.

The carbon-carbon double bond content of (meth) acrylamides (A) in the above-mentioned primer composition is calculated by the following formula (II).
Carbon-carbon double bond content (mass%) of (meth) acrylamides (A) in primer composition = (100 x 27 x P2 _m x P2 _n ) / (P2 _mw x S2) ... Formula (6) II)
In the formula (II), P2 _m is the mass (g) of (meth) acrylamides (A), P2 _n is the number of carbon-carbon double bonds per molecule of (meth) acrylamides (A), P2 _mw is Molecular weight (g / mol) of (meth) acrylamides (A), S2 is the total mass (g) of solid content of the primer composition.

The content of (meth) acrylamides (A) in the primer composition is preferably 5% by mass or more, more preferably 10% by mass or more, further preferably 20% by mass or more, and particularly preferably 25% by mass or more. Preferred. The upper limit thereof is preferably 95% by mass or less, more preferably 90% by mass or less, still more preferably 80% by mass or less, and particularly preferably 75% by mass or less. If the content of the (meth) acrylamides (A) is too small or too large, the adhesion between the substrate film and the coating layer tends to decrease and the blocking resistance tends to decrease.

<Crosslinking agent (B)>
As the crosslinking agent (B), particularly from isocyanate compounds, oxazoline compounds, epoxy compounds, carbodiimide compounds, amine compounds, metal compounds, aziridine compounds, hydrazine compounds, hydrazide compounds and melamine compounds It is preferred to use at least one compound selected from the group consisting of The use of these compounds reduces the tackiness of the primer layer, improves the strength of the coating film comprising the primer composition, and improves the wetting of coating agents such as solvent-free active energy ray-curable resins, etc., thus blocking resistance And adhesion to solvent-free active energy ray curable resins and the like are improved.

Among these, an isocyanate compound, an oxazoline compound and a carbodiimide compound are particularly preferable from the viewpoint of adhesion to a solventless active energy ray curable resin etc., and an isocyanate compound is more preferable among them. .

The isocyanate compound may be a compound containing at least two or more isocyanate groups in the molecule as a functional group, for example, tolylene diisocyanate such as 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate Compounds; xylylene diisocyanate compounds such as 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, tetramethyl xylylene diisocyanate; and aromatic isocyanate compounds such as 1,5-naphthalene diisocyanate and triphenylmethane triisocyanate Hexamethylene diisocyanate, isophorone diisocyanate, and adducts of these isocyanate compounds with polyol compounds such as trimethylolpropane, and these polyisocyanate compounds Like biuret and isocyanurate and the like of it.

Specifically, “Aquanate 110” and “Aquanate 210” manufactured by Nippon Polyurethane Co., Ltd., “Elastron BN-27” manufactured by Daiichi Kogyo Seiyaku Co., Ltd., “Elastron BN-77” Micanate TP-10 "," SU-268A "," Trixene aqua BI200 "manufactured by Baxenden Chemical Limited," Trixene aqua BI220 "and the like.

Among them, in order to avoid yellowing due to ultraviolet light, aliphatic isocyanate type or alicyclic isocyanate type is more preferable than aromatic isocyanate type. Further, from the viewpoint of stability, those of functional block type are preferable, and “SU-268A”, “Trixene aqua BI220” and the like are preferable.

As the oxazoline compound, for example, addition polymerizable 2-oxazoline (for example, 2-isopropenyl-2-oxazoline) having a substituent having an unsaturated carbon-carbon bond at the 2-position carbon position (for example, 2-isopropenyl-2-oxazoline) and other unsaturated single compounds Copolymers with monomers and the like are listed, and commercially available products include “Epocross WS-500”, “Epocross WS-700”, “Epocross K-2010E”, “Epocross K-2020E”, and “Epocross WS-700” manufactured by Nippon Shokubai Co., Ltd. Epocross K-2030E "and the like.

As an epoxy compound, for example, an epoxy resin of bisphenol A epichlorohydrin type, sorbitol polyglycidyl ether (for example, "Denacol EX-611" manufactured by Nagase ChemteX, "Denacol EX-612", "Denacol EX-614" , "Denacol EX-614B", "Denacol EX-622", etc., polyglycerol polyglycidyl ether (eg, "Denacol EX-512", "Denacol EX-521", etc. manufactured by Nagase ChemteX Corporation), pentaerythritol poly Glycidyl ether (for example, "Denacol EX-411" manufactured by Nagase ChemteX Corp., etc.), diglycerol polyglycidyl ether (for example, "Denacol EX-421" manufactured by Nagase ChemteX Corp., etc.), glycerol polyglycidyl ether Ruethers (for example, “Denacol EX-313”, “Denacol EX-314” and the like manufactured by Nagase ChemteX Corp.), trimethylolpropane polyglycidyl ether (eg, “Denacol EX-321” and the like manufactured by Nagase ChemteX Corp.), Resorcinol diglycidyl ether (eg, “Denacol EX-201” manufactured by Nagase ChemteX Corp.), neopentyl glycol diglycidyl ether (eg, “Denacol EX-211” manufactured by Nagase ChemteX Corp.), 1,6- Hexanediol diglycidyl ether (for example, “Denacol EX-212” manufactured by Nagase ChemteX Corp., etc.), Hydrogenated bisphenol A diglycidyl ether (eg, “Denacol EX-252” manufactured by Nagase ChemteX Corp., etc.), Enting Cole diglycidyl ether (for example, "Denacol EX-810", "Denacol EX-811", etc. manufactured by Nagase ChemteX Corp.), diethylene glycol diglycidyl ether (eg, "Denacol EX-850" manufactured by Nagase ChemteX Corp., Denacol EX-851 etc.), polyethylene glycol diglycidyl ether (for example, "Denacol EX-821", "Denacol EX-830", "Denacol EX-832", "Denacol EX-841" manufactured by Nagase ChemteX, "Denacol EX-861 etc.", Propylene glycol diglycidyl ether (eg "Denacol EX-911" produced by Nagase Chemtex Co., Ltd.), polypropylene glycol diglycidyl ether (eg "Denaco produced by Nagase Chemtex Co., Ltd.) E.g. "EX-941", "Denacole EX-920", "Denacole EX-931" and the like.
Among them, the aqueous type is preferable.

The carbodiimide compound may be a compound having a carbodiimide group as a functional group, or at least two or more cyanamide groups in a tautomeric relationship, for example, “Carbodilite V-” manufactured by Nisshinbo Chemical Co., Ltd. 02 "," Carbodie Light V-02-L2 "," Carbodie Light SV-02 "," Carbodie Light V-04 "," Carbodie Light V-10 "," Carbodie Light E-03A "," Carbodie Light E-02 "," Carbodie Light E -04 "and the like.

Examples of the amine compounds include hexamethylene diamine and triethanolamine.

Examples of metal compounds include metal alkoxides such as tetraethyl titanate, tetraethyl zirconate and aluminum isopropionate, and aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, zirconium, etc. Acetylacetone, acetoacetate ester, metal chelate compound of ethylenediaminetetraacetic acid coordination compound, acetic acid-ammonium complex salt of polyvalent metal, ammonium-carbonate complex salt of polyvalent metal, etc. may be mentioned.

The aziridine-based compound may be any one containing at least two or more aziridine groups, and examples thereof include “chemitite PZ-33” and “chemitite DZ-22E” manufactured by Nippon Shokubai Co., Ltd.

Examples of the hydrazine compound include hydrazine monohydrochloride, hydrazine dihydrochloride, hydrazine monohydrobromide, hydrazine carbonate and the like.

Examples of the hydrazide compound include adipic acid dihydrazide, sebacic acid dihydrazide, dodecanediohydrazide, isophthalic acid dihydrazide, salicylic acid hydrazide and the like.

Examples of melamine-based compounds include hexamethoxymethylolmelamine, "Nikalac MW-30M", "Nikalac MW-30", "Nikalac MW-22", "Nikalac MS-11" and "Nikalac" manufactured by Sanwa Chemical Co., Ltd. Methylated melamine resins such as MS-011 ”,“ Nikalac MX-730 ”,“ Nikalac MX-750 ”,“ Nikalac MX-706 ”,“ Nikalac MX-035 ”,“ Nikalac MX-45 ”,“ Nikalac MX- And mixed etherified melamine resins such as 410 ".

As a crosslinking agent (B), only 1 type chosen from these may be used, and 2 or more types may be used together.

The content of the crosslinking agent (B) in the primer composition can be appropriately selected according to the amount of functional groups of (meth) acrylamides (A), the weight average molecular weight of (meth) acrylamides (A), and the purpose of use. The content is preferably 5% by mass or more, more preferably 10% by mass or more, further preferably 15% by mass or more, and particularly preferably 18% by mass or more. The upper limit thereof is preferably 95% by mass or less, more preferably 90% by mass or less, still more preferably 80% by mass or less, and particularly preferably 75% by mass or less. If the content of the crosslinking agent (B) is too small or too large, crosslinking tends to be insufficient and adhesion to a solventless active energy ray curable resin and the like and blocking resistance tend to be lowered.

In the present invention, the content ratio (mass ratio) of the (meth) acrylamides (A) and the crosslinking agent (B) in the primer composition is the adhesion to a solventless active energy ray curable resin and the like, and the resistance to From the viewpoint of blocking properties, the (meth) acrylamides (A): crosslinking agent (B) is preferably 10:90 to 90:10, particularly preferably 15:85 to 85:15, and still more preferably 20: 80 to 80:20, particularly preferably 25:75 to 75:25. Even if the amount of the crosslinking agent (B) is too small or too large relative to the (meth) acrylamides (A), adhesion to a solventless active energy ray curable resin and the like and blocking resistance tend to be lowered. .

In the present invention, in the case of using a hydroxyl group-containing (meth) acrylamide which is the most preferable as the (meth) acrylamides (A) and using an isocyanate compound which is the most preferable as the crosslinking agent (B), The content ratio (hydroxyl group content: isocyanate group content) (molar ratio) of the hydroxyl group of hydroxyl group-containing (meth) acrylamides and the isocyanate group of crosslinking agent (B) in the composition is preferably 100: 1 to 100: 300. Particular preference is given to 100: 3 to 100: 150, more preferably 100: 5 to 100: 100, particularly preferably 100: 10 to 100: 70. If the content ratio of isocyanate groups is too small, adhesion to non-solvent type active energy ray curable resins and blocking resistance tend to decrease, and if too large, the primer layer reacts with moisture in the air and changes with time. It tends to cause.

In the present invention, it is preferable to use a curing catalyst in order to accelerate the reaction of (meth) acrylamides (A) and the crosslinking agent (B), and further a binder resin (C) described later.
Examples of such a curing catalyst include metal-based compounds such as organic tin compounds, organic titanium compounds and organic zirconia compounds, and amine-based compounds. Among them, metal-based compounds are preferred in terms of catalytic activity, and in particular Organotin compounds are preferred.
The content of the curing catalyst is preferably 0.01 to 5 parts by mass, particularly preferably 0.1 to 2 parts by mass, and more preferably 0.5 to 1.5 parts by mass with respect to 100 parts by mass of the primer composition. is there.

<Binder resin (C)>
The primer composition of the present invention contains various polymers as binders for supporting the (meth) acrylamides (A) and the crosslinking agent (B), for the purpose of improving the coating appearance, transparency, adhesion and the like. It is also possible to use it as a resin (C).

Specific examples of the binder resin (C) include, for example, polyurethane resins, polyester resins, acrylic resins, vinyl resins (polyvinyl alcohol etc.), polyalkylene glycols, polyalkyleneimines, methyl cellulose, hydroxycellulose, starches, etc. Can be mentioned. Among them, polyurethane resins, polyester resins and acrylic resins are preferable from the viewpoint of adhesion improvement, polyester resins and acrylic resins are particularly preferable, and polyester resins are more preferable.

The polyurethane resin is a polymer compound having a urethane bond in the molecule, and is usually produced by the reaction of a polyol and an isocyanate. Examples of the polyol include polyester polyols, polycarbonate polyols, polyether polyols, polyolefin polyols, and acrylic polyols. These compounds may be used alone or in combination of two or more.

The polyester-based resin includes, for example, those composed of the following polyhydric carboxylic acids and polyol compounds as main components.
Examples of polyvalent carboxylic acids include terephthalic acid, isophthalic acid, orthophthalic acid, phthalic acid, 4,4′-diphenyldicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6- Aromatic dicarboxylic acids such as naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, alicyclic dicarboxylic acids such as 1,4-cyclohexane dicarboxylic acid, 1,3-cyclohexane dicarboxylic acid, 2-potassium sulfoterephthalic acid, 5- Sulfonic acid metal salt-containing dicarboxylic acids such as sodium sulfoisophthalic acid, adipic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, aliphatic dicarboxylic acids such as glutaric acid and succinic acid, trimellitic acid, trimesic acid, pyromellitic acid And trifunctional or more such as trimellitic anhydride and pyromellitic anhydride Polyhydroxycarboxylic acids, hydroxyl acids such as p-hydroxybenzoic acid and ester-forming derivatives thereof can be used.

Examples of polyol compounds include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 2- Aliphatic diols such as methyl-1,5-pentanediol and neopentyl glycol, alicyclic diols such as 1,4-cyclohexanedimethanol and 1,3-cyclohexanedimethanol, and p-xylylene glycol And aromatic diols such as bisphenol A-ethylene glycol adducts, diethylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polytetramethylene oxide glycol, etc. Polyether diol, dimethylol propionic acid, di Carboxyl group-containing diols such Chirorubutan acid, glycerol, trimethylol - such as trifunctional or higher polyols such as trimethylolpropane may be used.

Among these compounds, one or more may be appropriately selected, and a polyester resin may be synthesized by a polycondensation reaction in a conventional manner. Among these polyester-based resins, those containing a component having a sulfonate, or having an acid value of 10 or more are preferable from the viewpoint of making water-based, and adhesion to non-solvent-based active energy ray-curable resins etc. From the viewpoint, one containing a component having a sulfonate is particularly preferable.

An acrylic resin is a polymer composed of a polymerizable monomer having a carbon-carbon double bond as represented by a (meth) acrylate monomer. These may be homopolymers or copolymers. Also included are copolymers (e.g. block copolymers, graft copolymers) of these polymers with other polymers (e.g. polyesters, polyurethanes etc). Also included are polyester solutions or polymers obtained by polymerizing polymerizable monomers having carbon-carbon double bonds in polyester dispersions (in some cases, mixtures of polymers). Also included are polyurethane solutions, polymers obtained by polymerizing polymerizable monomers having carbon-carbon double bonds in polyurethane dispersion (in some cases, mixtures of polymers). Similarly, other polymer solutions, or polymers obtained by polymerizing polymerizable monomers having carbon-carbon double bonds in the dispersion (in some cases, polymer mixtures) are also included.

The polymerizable monomer having a carbon-carbon double bond is not particularly limited, but as representative compounds, for example, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, fumaric acid, maleic acid, citraconic Various carboxyl group-containing monomers such as acids, and salts thereof; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, monobutyl hydroxyl fumarate, Various hydroxyl group-containing monomers such as monobutyl hydroxyitaconate; Various (meth) such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate and lauryl (meth) acrylate Acrylic acid alkyl ester Various nitrogen-containing vinyl monomers such as (meth) acrylamide, diacetone acrylamide, N-methylol acrylamide or (meth) acrylonitrile; various styrene derivatives such as styrene, α-methylstyrene, divinylbenzene, vinyltoluene Various vinyl esters such as vinyl acetate and vinyl propionate; various silicon-containing polymerizable monomers such as γ-methacryloxypropyltrimethoxysilane and vinyltrimethoxysilane; phosphorus-containing vinyl monomers; vinyl chloride And vinyl halides such as pyridene chloride; and conjugated dienes such as butadiene.

The content of the binder resin (C) is preferably 3 to 200 parts by mass, particularly 5 to 100 parts by mass, based on 100 parts by mass of the (meth) acrylamides (A) and the crosslinking agent (B). It is preferable that the amount is 8 to 60 parts by mass.

Further, the content of the binder resin (C) in the primer composition is preferably 1% by mass or more, particularly preferably 5% by mass or more, still more preferably 7% by mass or more, and 70% by mass or less It is preferably at most 60% by mass, more preferably at most 50% by mass, particularly preferably at most 40% by mass. When the binder resin (C) is contained, if the content of the binder resin (C) is too small, there is a tendency for the transparency of the coating film comprising the primer composition to decrease due to poor film formation, etc. The contents of the (meth) acrylamides (A) and the crosslinking agent (B) in the composition tend to be too small, which makes it difficult to achieve both adhesion and blocking resistance.

In the primer composition of the present invention, in addition to the above-mentioned components, if necessary, an antioxidant such as a hindered phenol, a heat stabilizer, a glass fiber, an inorganic / organic filler, a colorant, a flame retardant, and softening An agent, a dispersing agent, a wetting agent, an emulsifying agent, a gelling agent, an antifoaming agent, other thermoplastic resins and the like can be blended to such an extent that the effects of the present invention are not impaired.

The primer composition of the present invention can be prepared by mixing (meth) acrylamides (A), a crosslinking agent (B), and optionally a binder resin (C) and other components.

<Aqueous liquid>
The aqueous liquid of the present invention is obtained by dissolving or dispersing the above-mentioned primer composition in an aqueous solvent. Hereinafter, dissolving or dispersing in an aqueous solvent is referred to as "water dissolution or dispersion".
The aqueous liquid of the present invention can be prepared by appropriately mixing at least the above (meth) acrylamides (A) and the crosslinking agent (B), preferably further with the binder resin (C), in an aqueous solvent. For example, (1) a method of mixing the respective components and then mixing the aqueous solvent to obtain the aqueous liquid of the present invention, (2) leaving each of the respective components in the aqueous solvent as the aqueous liquid and mixing them The method of making it an aqueous liquid, (3) the method of leaving any one or more of each component as an aqueous liquid with an aqueous solvent, and mixing the remaining components to make the aqueous liquid of the present invention, etc. may be mentioned. The method (2) or (3) above is preferred from the viewpoint of

Examples of the aqueous solvent include water or a mixture of water and an appropriate hydrophilic organic solvent.
Examples of the hydrophilic organic solvent include ketones such as acetone; alcohols such as methanol, ethanol and isopropyl alcohol; glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol monobutyl ether and ethylene glycol monotertiary butyl ether; Examples thereof include carboxylic acid esters such as diisobutyl acid, diisobutyl glutaric acid, diisobutyl adipate and the like which can be mixed with water.

When using a hydrophilic organic solvent, the content rate with respect to the whole of the aqueous liquid of this invention is set suitably. For example, although it can set as the range of 20 mass% or less, it is not limited to this. Moreover, 1 type chosen from these hydrophilic organic solvents may be used, or you may use together 2 or more types.

When preparing an aqueous liquid in which (meth) acrylamides (A) and a crosslinking agent (B), preferably further a binder resin (C), are dissolved or dispersed in an aqueous solvent, when these have an acidic group, the aqueous solvent It is preferable to blend a neutralizing agent in order to dissolve or disperse uniformly.

As such a neutralizing agent, any agent capable of neutralizing the acidic groups of (meth) acrylamides (A), crosslinking agent (B) and binder resin (C) contained in the primer composition may be used. Specifically, for example, metal hydroxides such as lithium hydroxide, potassium hydroxide and sodium hydroxide; ethylamine, diethylamine, triethylamine, propylamine, isopropylamine, iminobispropylamine, 3-ethoxypropylamine, 3- Organic amines such as diethylaminopropylamine, diethanolamine, triethanolamine, N, N-diethylethanolamine, N, N-dimethylethanolamine, aminoethanolamine, morpholine, N-methylmorpholine, N-ethylmorpholine, and ammonia etc. It can be mentioned. One type selected from these neutralizing agents may be used, or two or more types may be used in combination.

Among these neutralizing agents, those having a boiling point of 150 ° C. or less are preferable because they are easily volatilized by drying and the water resistance of the primer layer. In particular, ammonia and triethylamine are preferable, and ammonia is particularly preferable, from the viewpoints of high versatility, low boiling point and easy volatilization at the time of drying.

Moreover, surfactant, such as an anionic surfactant and a nonionic surfactant, can be mix | blended with the aqueous liquid of this invention as needed. By blending the surfactant, it is possible to improve the wettability to the base film when the aqueous liquid is applied to a polyester resin base such as a polyester film.
As the surfactant, any appropriate one may be used, such as polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester, fatty acid metal soap, alkyl sulfate, alkyl sulfonate, Alkyl sulfosuccinate, dodecylbenzene sulfonate and the like can be mentioned. One type selected from these surfactants may be used, or two or more types may be used in combination.
From the viewpoint of the adhesion between the coating layer and the primer layer and the water resistance of the primer layer, it is preferable not to add a surfactant.

In addition, an antistatic agent, a filler, an ultraviolet absorber, a lubricant, a coloring agent and the like may be added to the aqueous liquid of the present invention as required.

The concentration of the solid content of the aqueous liquid of the present invention is appropriately adjusted so as to ensure good dispersibility of the (meth) acrylamides (A), the crosslinking agent (B), and preferably the binder resin (C). For example, 5 to 30% by mass is preferable. At the time of application to a substrate film, it is suitably diluted to obtain a desired film thickness, and for example, the solid content concentration is adjusted to 1 to 15% by mass and used.

<Base film with primer layer>
It is obtained from a primer composition containing (meth) acrylamides (A) and a crosslinking agent (B), more preferably a binder resin (C), by applying the aqueous liquid of the present invention to a substrate film and drying by heating. Can be formed to obtain a substrate film with a primer layer.

Examples of the base film include polyester resins such as polyethylene naphthalate, polyethylene-2,6-naphthalate, polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate / isophthalate copolymer; polyethylene, polypropylene, polymethylpentene, etc. Polyolefin resins; polyvinyl fluoride resins such as polyvinyl fluoride, polyvinylidene fluoride and polyethylene fluoride; polyamides such as nylon 6, nylon 6, 6 etc .; polyvinyl chloride, polyvinyl chloride / vinyl acetate copolymer, ethylene- Vinyl polymers such as vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, vinylon and the like; cellulose resins such as cellulose triacetate and cellophane; polymethyl methacrylate, Ethyl Li methacrylate, polyethyl acrylate, acrylic resins such as polybutyl acrylate; polystyrene, polycarbonate, polyarylate, single layer material or a multi-layer products thereof are selected from synthetic resin film or sheet such as polyimide.
Among them, polyester films are preferably used in view of transparency, chemical resistance, heat resistance, mechanical strength, cost and the like.
The polyester film may be either unstretched or stretched, but it is preferable to use a stretched film, and in particular, it is preferable to use a biaxially stretched film.

As a method of applying the aqueous liquid, known methods can be used, and examples thereof include a method of applying a kiss coat, a reverse coat, a gravure coat, a die coat or the like on one side or both sides of the substrate film.

The thickness of the primer layer after drying by heating (after crosslinking) is preferably 0.01 to 2 μm, more preferably 0.02 to 0.5 μm, particularly 0.03 to 0.3 μm, particularly The thickness is preferably 0.05 to 0.15 μm. If the thickness is too thin, the adhesion tends to decrease, and if the thickness is too thick, optical properties such as transparency and haze tend to decrease, and blocking resistance tends to decrease.

<Laminated film / prism sheet>
By further providing a coating layer on the primer layer of the substrate film with a primer layer described above and using the coating layer as a hard coat layer or a prism layer, a laminated film or a prism sheet can be obtained.
Examples of the material for forming the coating layer include acrylic resins, epoxy resins, urethane resins, active energy ray curable resin compositions and the like generally used as coating materials, among which active energy ray curing Resin compositions are preferred.

<< Laminated film >>
A laminated film coats the active energy ray curable resin composition on the primer layer of the base material film with the above primer layer, and irradiates and cures the active energy ray to cure the primer layer of the base material film with the primer layer. It can be obtained by forming a hard coat layer formed by curing the active energy ray curable resin composition thereon.

The thickness of the hard coat layer is usually 0.5 to 15 μm, preferably 1 to 10 μm, and particularly preferably 2 to 7 μm.

<< prism sheet >>
A prism sheet can be obtained by forming a prism layer on the primer layer of the said base material film with a primer layer.
The prism layer is preferably a cured product of an active energy ray curable resin composition, and particularly preferably a cured product of a solventless active energy ray curable resin composition.

When the prism layer is a cured product of an active energy ray curable resin composition, for example, the active energy ray curable resin composition is introduced into a prism type, and a prism type and a primer layer are provided. The active energy ray is irradiated in a state in which the active energy ray curable resin composition is sandwiched between the primer film side of the base film (particularly, polyester film), and the active energy ray curable resin composition is cured to obtain a prism type The method of forming the hardened | cured material of the active energy ray curable resin composition on a base film is mentioned by removing.

It does not specifically limit as a coating method of the said active energy ray curable resin composition, For example, a spray, a shower, dipping, a roll, a spin, a curtain, a flow, a slit, a die, a gravure, a comma, a dispenser, Wet coating methods such as screen printing, inkjet printing and the like can be mentioned.

As the active energy ray, for example, light rays such as far ultraviolet rays, ultraviolet rays, near ultraviolet rays, infrared rays, etc., electromagnetic waves such as X rays, γ rays etc., electron rays, proton rays, neutron rays etc. can be used. Curing by ultraviolet irradiation is advantageous in terms of the availability and cost of the apparatus.
As a method of curing by ultraviolet irradiation, a high pressure mercury lamp, an ultra high pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, a chemical lamp, an electrode discharge lamp, an LED, etc. emitting light in a wavelength range of 150 to 450 nm. The irradiation may be about 30 to 3,000 mJ / cm ² .
After irradiation with ultraviolet light, heating may be performed as necessary to complete curing.

The thickness of the prism layer is preferably 5 to 50 μm, more preferably 10 to 45 μm, still more preferably 15 to 40 μm, and particularly preferably 20 to 35 μm.

Hereinafter, the present invention will be described in more detail by way of examples and comparative examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.
The measurement methods and evaluation methods used in the examples and comparative examples are as follows.
In the following, "part" and "%" are based on mass.

The following ingredients were prepared.

<(Meth) acrylamides (A)>
(A-1): N-methylol acrylamide ("N-MAM" manufactured by Hino Kosan Co., Ltd.) (hydroxy value: 487 mg KOH / g, carbon-carbon double bond content: 26.7 mass%)
(A-2): N-hydroxyethyl acrylamide ("HEAA" manufactured by KJ Chemicals Ltd.) (hydroxy value: 555 mg KOH / g, carbon-carbon double bond content: 23.4 mass%)

The following compounds were prepared as comparative compounds.
(A'-1): Trimethylolpropane ethylene oxide modified triacrylate (all ethylene oxide units = 15/1 molecule) ("T-70 EA" manufactured by Toho Chemical Industry Co., Ltd.)

<Crosslinking agent (B)>
(B-1): a nonionic block isocyanate aqueous dispersion having a 1,6-hexamethylene diisocyanate trimer skeleton (“Trixene aqua BI220” manufactured by Baxenden Chemicals Limited (solid content 40%, isocyanate group equivalent 400 g / mol ( Solid content value)))
(B-2): Oxazoline group-containing polymer water dispersion ("Epocross WS-700" manufactured by Nippon Shokubai Co., Ltd. (solid content 25%, oxazoline equivalent 220 g / mol (solid content value)))

<Binder resin (C)>
(C-1): aqueous liquid of polyester resin produced according to the following production example 1 (solid content concentration 20%)

Production Example 1
In a reaction vessel equipped with a thermometer, a stirrer, a rectification column, and a nitrogen inlet tube, 252 parts (1.517 mol) of terephthalic acid and 135 parts (0.813 mol) of isophthalic acid as polyvalent carboxylic acid components, 5-sodium 60 parts (0.203 mol) of dimethyl sulfoisophthalate, 248 parts (3.995 mol) of ethylene glycol as a polyol component, 6 parts (0.057 mol) of diethylene glycol, 0.3 parts of zinc (II) acetate as a catalyst, diantimony trioxide 0.4 was charged, the temperature was raised over 2 hours until the internal temperature reached 200 to 240 ° C., and the esterification reaction was carried out at 240 ° C. for 3 hours. Thereafter, the pressure in the system was reduced to about 1 mmHg, and a polycondensation reaction was performed at an internal temperature of 240 ° C. to obtain a polyester resin.
The obtained polyester resin had an acid value of 3 mg KOH / g, a number average molecular weight of 8,300, a weight average molecular weight of 12,700, and a glass transition temperature of 51 ° C.

Next, 20 parts of the polyester resin thus obtained, 80 parts of deionized water, and 0.1 parts of 25% ammonia water are charged in a reactor, the temperature is raised to 90 ° C., and the mixture is dissolved while stirring. An aqueous liquid (water dispersion) of polyester resin was prepared.

Examples 1 to 5 and Comparative Example 1
Each component is mixed using the (meth) acrylamides (A) and the crosslinking agent (B) prepared above so that the solid content mass ratio will be as shown in Table 1, and Examples 1 to 5 and Comparative The primer composition of Example 1 was prepared.

In Examples 1 to 4, the content ratio (hydroxyl content: isocyanate group content) (molar ratio) of the hydroxyl group of (meth) acrylamides (A) and the isocyanate group of the crosslinking agent (B) in the obtained primer composition It calculated | required by following formula (III). In Example 5, the content ratio (hydroxyl group content: oxazoline group content) (molar ratio) of the hydroxyl group of (meth) acrylamides (A) in the primer composition and the oxazoline group of the crosslinking agent (B) was determined. . The results are shown in Table 1.

Hydroxyl group content: isocyanate group content (or oxazoline group content) (molar _{ratio) = {(H m × H} n) / (H mw)}: {I m / I mw} ··· formula (III)
In the formula (III), the mass of the _{H m} of the hydroxyl group-containing compound (g), _{H n} is the number of hydroxyl groups per molecule of hydroxyl group-containing _compound, the molecular weight of the _{H mw} the hydroxyl group-containing compound (g / mol), _{I m} isocyanate The mass (g) and _Imw of the group-containing compound (or the oxazoline group-containing compound) are isocyanate group equivalents (or oxazoline group equivalents) (g / mol).
In Table 1, the amount of hydroxyl groups: the amount of isocyanate groups (or the amount of oxazoline groups) (molar ratio) when the amount of hydroxyl groups is converted to 100 is described.

About the obtained primer composition, adhesiveness with the resin layer formed by hardening | curing a non-solvent type ultraviolet curable resin composition for prism layer formation according to the following method and blocking resistance were evaluated. The results are shown in Table 1.

[Adhesiveness]
The primer composition prepared above was diluted with deionized water so that the solid content of the composition aqueous solution was 3%, to prepare a coating solution of the primer composition. The coating solution thus prepared was coated on a PET film (Toray Industries, Inc., Lumirror T60, thickness 100 μm) with a bar coater No. The primer layer was applied at 6 and dried at 150 ° C. for 3 minutes to form a 0.2 μm thick primer layer.

Next, a solvent-free ultraviolet curable resin composition "Sun Rad A" (manufactured by Sanyo Chemical Industries, Ltd.) for forming a prism layer is applied on the above primer layer using an applicator, and subsequently 13 cm high from the coated surface The ultraviolet ray curable resin composition was cured by irradiating ultraviolet rays at 450 mJ / cm ² using a high pressure mercury lamp having an irradiation intensity of 80 W / cm set at a height to form a 25 μm thick resin layer.

100 crosscuts of 1 mm ² were placed in the UV curable resin layer formed in this way, Sellotape (registered trademark) made by Nichiban Co. was affixed on top of it, and the tape was rubbed with a plastic eraser to make it fully adhere After that, peeling was performed rapidly in the 90 ° direction, and adhesion was evaluated based on the number of squares on which the resin layer remained. The evaluation criteria are as follows, and 及 び and を were regarded as having good adhesion.

(Evaluation criteria)
:: 98/100 or more (remaining number / measured number)
○: 86/100 or more, 97/100 or less Δ: 66/100 or more, 85/100 or less ×: 65/100 or less

[Blocking resistance]
The primer composition prepared above was diluted with deionized water so that the solid content of the composition aqueous solution was 20%, to prepare a coating solution of the primer composition. The coating solution thus prepared was coated on a PET film (Toray Industries, Inc., Lumirror T60, thickness 100 μm) with a bar coater No. The primer layer was formed to a thickness of 2 μm by coating at 10 and drying at 150 ° C. for 3 minutes.

The two PET films with primer layer obtained above, the surface on the primer layer side of one of the PET film with primer layer and the surface on the base film side of the other PET film with primer layer (the primer layer is not provided It piled up so that it might contact | connect an untreated surface, and it left still in 23 degreeC and the environment of 50% of a relative humidity in the state which applied the pressure of 6.2 g / cm < ² > overnight. Then, the blocking resistance was evaluated by confirming the adhesion state of two PET film with a primer layer. Evaluation criteria are as follows.

(Evaluation criteria)
Good: No adhesion is observed on the two PET film with primer layer, or the two PET film with primer layer is easily peeled off, and migration to the non-treated surface of the primer layer and fusion scar are not observed.
X: Two PET film with primer layer is in close contact, or migration of the primer layer to an untreated surface or a fusion scar is observed when the two PET film with primer layer is peeled off.

From the results of Table 1, since the primer compositions of Examples 1 to 5 contain (meth) acrylamides (A) and a crosslinking agent (B), adhesion between both the substrate film and the resin layer It turned out that it is excellent in quality and also excellent in blocking resistance.
On the other hand, Comparative Example 1 was inferior in blocking resistance because it used an acrylate compound instead of (meth) acrylamides (A).

Examples 6 to 8
Using the (meth) acrylamides (A), the crosslinking agent (B) and the binder resin (C) prepared as described above, the respective components are mixed so as to have a solid content mass ratio as shown in Table 2 The primer compositions of Examples 6-8 were prepared.

In the same manner as in Example 1, the content ratio (hydroxyl group content: isocyanate group content) (molar ratio) of the hydroxyl group of (meth) acrylamides (A) and the isocyanate group of the crosslinking agent (B) in the obtained primer composition I asked. The results are shown in Table 2.

The adhesion and blocking resistance of the obtained primer composition with the resin layer formed by curing the solventless ultraviolet curable resin composition for forming a prism layer described above are evaluated according to the following method. The sex was evaluated. The results are shown in Table 2.

〔transparency〕
The primer composition prepared above was diluted with deionized water so that the solid content of the composition aqueous solution was 3%, to prepare a coating solution of the primer composition. The coating solution thus prepared was coated on a PET film (Toray Industries, Inc., Lumirror T60, thickness 100 μm) with a bar coater No. The primer layer was applied at 6 and dried at 150 ° C. for 3 minutes to form a 0.2 μm thick primer layer.
The PET film with a primer layer obtained above was observed visually, and transparency was evaluated according to the following evaluation criteria.

(Evaluation criteria)
Good: The transparency is high, and neither cloudiness of the film nor film formation defect is visually confirmed.
Δ: Slightly lacking in transparency, when exposed to light, clouding of the film, poor film formation and the like are confirmed visually.
X: Lack of transparency, clouding of the film, poor film formation, etc. are clearly confirmed visually.

From the results in Table 2, the primer compositions of Examples 6 to 8 contain a polyester resin as a binder resin (C) in addition to the (meth) acrylamides (A) and the crosslinking agent (B). By this, it turned out that the transparency is also excellent.

Although the invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. This application is based on Japanese Patent Application (Japanese Patent Application No. 2017-129132) filed on June 30, 2017, the contents of which are incorporated herein by reference.

The primer composition of the present invention can be suitably used as a primer for a substrate film. Moreover, the base film with a primer layer obtained is excellent in adhesiveness with the coating layer formed by curing of the active energy ray curable resin composition, and, for example, a label sheet, a sheet for printing, a hard coat film, It is useful as a sheet which provides a coating layer on a film, such as a prism sheet, and is particularly useful as a prism sheet.

Claims (14)

1. Primer composition containing (meth) acrylamides (A) and a crosslinking agent (B).
2. A group in which the crosslinking agent (B) comprises an isocyanate compound, an oxazoline compound, an epoxy compound, a carbodiimide compound, an amine compound, a metal compound, an aziridine compound, a hydrazine compound, a hydrazide compound and a melamine compound The primer composition according to claim 1, which is at least one compound selected from the group consisting of
3. The primer composition according to claim 1 or 2, wherein the (meth) acrylamides (A) are hydroxyl group-containing (meth) acrylamides.
4. The primer composition according to any one of claims 1 to 3, wherein the carbon-carbon double bond content in the (meth) acrylamides (A) is 1 to 40% by mass.
5. 5. The primer composition according to any one of claims 1 to 4, wherein the carbon-carbon double bond content of (meth) acrylamides (A) in the primer composition is 0.5 to 35% by mass.
6. The primer composition according to any one of claims 1 to 5, wherein the content ratio (mass ratio) of the (meth) acrylamides (A) to the crosslinking agent (B) is 10:90 to 90:10.
7. The primer composition according to any one of claims 1 to 6, further comprising a binder resin (C).
8. The primer composition according to claim 7, wherein the binder resin (C) is a polyester resin.
9. The primer composition according to claim 7 or 8, wherein the content of the binder resin (C) in the primer composition is 1 to 70% by mass.
10. An aqueous liquid comprising the primer composition according to any one of claims 1 to 9 dissolved or dispersed in an aqueous solvent.
11. A substrate film with a primer layer having a primer layer comprising the primer composition according to any one of claims 1 to 9 on a substrate film.
12. A prism sheet having a prism layer on the primer layer of the substrate film with a primer layer according to claim 11.
13. The prism sheet according to claim 12, wherein the prism layer is a cured product of a solventless active energy ray curable resin composition.
14. Use of a composition containing (meth) acrylamides (A) and a crosslinking agent (B) as a primer composition.