WO2021085327A1 - 積層ポリエステルフィルム - Google Patents
積層ポリエステルフィルム Download PDFInfo
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- WO2021085327A1 WO2021085327A1 PCT/JP2020/039892 JP2020039892W WO2021085327A1 WO 2021085327 A1 WO2021085327 A1 WO 2021085327A1 JP 2020039892 W JP2020039892 W JP 2020039892W WO 2021085327 A1 WO2021085327 A1 WO 2021085327A1
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- polyester film
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Classifications
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
- C08J2475/06—Polyurethanes from polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
- C08J2475/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
Definitions
- the present invention relates to a laminated polyester film. More specifically, the present invention relates to a laminated polyester film having an easily adhesive coating layer that is most suitable for all fields such as optics, packaging, and labels.
- Thermoplastic resin films especially polyester films, have excellent mechanical properties, electrical properties, dimensional stability, transparency, chemical resistance, etc., and therefore have excellent properties such as magnetic recording materials, packaging materials, solar cell applications, and flat displays. It is widely used in antireflection films, diffusion sheets, optical films such as prism sheets, and label printing films.
- the surface of the polyester film is highly crystallinely oriented, it has a drawback that it has poor adhesion to various paints, resins, and inks in processing in these applications. For this reason, conventionally, studies have been made to impart adhesiveness to the surface of the polyester film by various methods.
- Patent Document 1 a method in which various resins are mainly applied to the surface of the polyester film to provide a coating layer having easy adhesive performance is often used.
- a coating liquid containing a copolymerized polyester resin or a urethane resin, or a coating liquid in which these resins and a cross-linking agent are used in combination is used as a coating layer to obtain a polyurethane acrylate or a polyurethane acrylate used as a hard coating agent or a prism lens agent.
- a technique for improving the affinity with resin components such as ester acrylic rate and imparting adhesion to them has been known (Patent Documents 2 and 3).
- UV curable inks ultraviolet curable inks (ultraviolet curable inks) used for label printing contain dyes or pigments in order to develop color tones in addition to resins, and pigments with relatively good light resistance contain 15 to 15 ink components.
- the content of the white pigment is as high as about 50% by weight, so that the adhesion is insufficient by the conventional technique, and it is particularly difficult to adhere at a low dose.
- an object of the present invention is to have good adhesiveness to a UV curable resin, particularly excellent adhesiveness to a coating agent such as UV curable ink, and to maintain a high level of adhesiveness for a long period of time.
- the purpose is to provide an excellent laminated polyester film.
- the present invention has the following configuration. 1.
- the laminated polyester film of the present invention is excellent in adhesiveness to UV curable resins such as hard coat layer, lens layer, and ink, but is particularly excellent in high level adhesiveness to UV curable ink.
- the polyester resin constituting the polyester film base material includes polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polytrimethylene terephthalate and the like, as well as the diol component or dicarboxylic acid component of the polyester resin as described above. It is a copolymerized polyester resin in which a part of the above is replaced with the following copolymerization component.
- a diol component such as diethylene glycol, neopentyl glycol, 1,4-cyclohexanedimethanol, polyalkylene glycol, etc.
- Dicarboxylic acid components such as adipic acid, sebatic acid, phthalic acid, isophthalic acid, 5-sodium isophthalic acid, and 2,6-naphthalenedicarboxylic acid.
- the polyester resin preferably used for the polyester film base material in the present invention is mainly selected from polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene-2,6-naphthalate.
- polyethylene terephthalate is most preferable from the viewpoint of the balance between physical properties and cost.
- the polyester film base material composed of these polyester resins is preferably a biaxially stretched polyester film, and can improve chemical resistance, heat resistance, mechanical strength and the like.
- the catalyst for polycondensation used in the production of polyester resin is not particularly limited, but antimony trioxide is suitable because it is an inexpensive catalyst and has excellent catalytic activity. It is also preferable to use a germanium compound or a titanium compound. More preferable polycondensation catalysts include catalysts containing aluminum and / or its compounds and phenolic compounds, catalysts containing aluminum and / or its compounds and phosphorus compounds, and catalysts containing aluminum salts of phosphorus compounds.
- the polyester film base material in the present invention is not particularly limited in its layer structure, and may be a single-layer polyester film or a two-layer structure having different components from each other, and the outer layer and the inner layer may be formed. It may be a polyester film base material having at least three layers.
- the laminated polyester film of the present invention has an acid value of 30 to 50 mgKOH / g having a carboxyl group on at least one side thereof in order to improve the adhesiveness to the hard coat layer, the adhesiveness to the UV curable ink, and the blocking resistance. It is preferable that a coating layer formed of a polyurethane resin and a cross-linking agent having an acid value of 30 to 50 mgKOH / g having a carboxyl group is laminated.
- the coating layer may be provided on both sides of the polyester film, or may be provided on only one side of the polyester film, and different types of resin coating layers may be provided on the other side.
- the coating layer in the present invention has excellent adhesion to UV curable resins such as hard coat layers, lens layers, and inks or thermosetting resins, but is particularly excellent to adhesion to inks containing pigments. This effect is presumed to be the result of the interaction between the carboxyl groups in the coating layer and the pigment particles in the ink. Further, since the polyurethane resin and the cross-linking agent each have a certain range of carboxyl groups, the coating layer itself suppresses the occurrence of defects such as moisture and heat resistance due to the decrease in water resistance due to the single resin having many carboxyl groups. Can contain many carboxyl groups.
- the weight ratio of the polyurethane resin having a carboxyl group and the cross-linking agent having a carboxyl group is preferably in the range of 90/10 to 10/90, more preferably in the range of 80/20 to 20/80, and further in the range of 70/30 to 70/30.
- the range of 30/70 is preferable. If the amount of the cross-linking agent is small, the durability such as moisture and heat resistance is lowered, and if the amount of the polyurethane resin is small, the adhesion is lowered.
- the polyurethane resin having a carboxyl group is a urethane resin synthesized from at least a polyol component and a polyisocyanate component, and if necessary, a chain extender or the like, and has a carboxyl group in the molecule or in the side chain.
- the term "in the molecule” as used herein means a substance existing in the main chain or at the end of the polyurethane resin.
- the side chain is introduced onto the branched molecular chain after being synthesized and polymerized by the presence of three or more terminal functional groups of any of the raw material components constituting the molecular chain as described above. It is a thing.
- the polyurethane resin having a carboxyl group in the present invention can be obtained mainly by using a carboxyl group-containing polyol component as a urethane component.
- carboxyl group-containing polyol component examples include the following. Those having a relatively high molecular weight, for example, a carboxyl group-containing polyalkylene glycol, a carboxyl group-containing acrylic polyol, a carboxyl group-containing polyolefin polyol, a carboxyl group-containing polyester polyol, and the like can be used. In addition, relatively low molecular weight substances such as 2,2-dimethylolpropionic acid, 2,2-dimethylolbutanoic acid, 2,2-dimethylolbutyric acid, 2,2-dimethylolvaleric acid and the like can be used. .. Dimethylol propionic acid and dimethylol butanoic acid are particularly preferably used for introducing a carboxyl group.
- the acid value of the polyurethane resin having a carboxyl group is preferably 30 to 50 mgKOH / g, more preferably 35 to 45 mgKOH / g.
- the acid value is 30 mgKOH / g or more, the adhesion to UV curable resins, especially UV curable inks, is improved.
- the acid value is 50 mgKOH / g or less, the water resistance of the coating layer is maintained and the films do not easily adhere to each other due to moisture absorption, which is preferable.
- polyurethane resin of the present invention in order to supplement the water solubility or water dispersibility of the polyurethane resin, other hydrophilic groups such as hydroxyl groups, ethers, sulfonic acids, phosphonic acids, quaternary amines and the like are not deteriorated in performance. It may be introduced within.
- the carboxyl group in the polyurethane resin may be neutralized with a basic compound.
- the basic compound used for neutralization include alkali metals such as sodium and potassium, alkaline earth metals such as magnesium and calcium, and organic amine compounds. Among these, an organic amine compound that easily dissociates from a carboxyl group by heating is preferable.
- Examples of the organic amine compound include ammonia, methylamine, ethylamine, propylamine, isopropylamine, butylamine, 2-ethylhexylamine, cyclohexylamine, dimethylamine, diethylamine, dipropylamine, diisopropylamine, dibutylamine, trimethylamine, triethylamine, and the like.
- Linear, branched 1,2 or tertiary amines with 1 to 20 carbon atoms such as triisopropylamine, tributylamine and ethylenediamine, cyclic amines such as morpholin, N-alkylmorpholin and pyridine, monoisopropanolamine and methylethanol.
- Examples thereof include hydroxyl group-containing amines such as amines, methylisopropanolamines, dimethylethanolamines, diisopropanolamines, diethanolamines, triethanolamines, diethylethanolamines and triethanolamines.
- hydroxyl group-containing amines such as amines, methylisopropanolamines, dimethylethanolamines, diisopropanolamines, diethanolamines, triethanolamines, diethylethanolamines and triethanolamines.
- Polycarbonate polyol is preferably used as the other polyol component used for synthesizing and polymerizing the urethane resin in the present invention, and it is particularly preferable to contain an aliphatic polycarbonate polyol having excellent heat resistance and hydrolysis resistance.
- the aliphatic polycarbonate polyol include an aliphatic polycarbonate diol and an aliphatic polycarbonate triol, and an aliphatic polycarbonate diol can be preferably used.
- Examples of the aliphatic polycarbonate diol used for synthesizing and polymerizing the urethane resin having a polycarbonate structure in the present invention include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, and 1,5.
- -Pentanediol 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, 1,8-nonanediol, neopentyl glycol, diethylene glycol, dipropylene glycol and other diols
- examples thereof include aliphatic polycarbonate diols obtained by reacting one or more of them with carbonates such as dimethyl carbonate, ethylene carbonate and phosgen.
- the number average molecular weight of the polycarbonate polyol in the present invention is preferably 300 to 5000. It is more preferably 400 to 4000, and most preferably 500 to 3000. When it is 300 or more, the ink adhesion can be improved, which is preferable. When it is 3000 or less, blocking resistance can be improved, which is preferable.
- Examples of the polyisocyanate used for the synthesis and polymerization of the urethane resin in the present invention include aliphatic diisocyanates having an aromatic ring such as xylylene diisocyanate, isophorone diisocyanate, 4,4-dicyclohexylmethane diisocyanate, and 1,3-bis (isocyanate).
- Alicyclic diisocyanates such as methyl) cyclohexane, hexamethylene diisocyanates, and aliphatic diisocyanates such as 2,2,4-trimethylhexamethylene diisocyanates, or isocyanurate bonds, biuret bonds, or allophanate bonds produced from diisocyanates.
- Examples thereof include modified polyisocyanates containing and diisocyanates in which a single or a plurality of diisocyanates are previously added to trimethylolpropane or the like.
- modified polyisocyanates containing and diisocyanates in which a single or a plurality of diisocyanates are previously added to trimethylolpropane or the like.
- chain extender examples include glycols such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol and 1,6-hexanediol, polyhydric alcohols such as glycerin, trimethylolpropane, and pentaerythritol, and ethylenediamine. , Hexamethylenediamine, diamines such as piperazine, aminoalcohols such as monoethanolamine and diethanolamine, thiodiglycols such as thiodiethylene glycol, and water. Further, if the amount is small, a polyol having three or more functional groups, a polyamine, or the like may be used.
- glycols such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol and 1,6-hexanediol
- polyhydric alcohols such as glycerin, trimethylolpropane, and pen
- the polyurethane resin of the present invention may have a reactive group such as blocked isocyanate at the end or side chain in order to improve the toughness.
- a cross-linking agent having a carboxyl group and an acid value of 30 to 50 mgKOH / g is used. Further, the carboxyl group of the cross-linking agent may be neutralized with a basic compound as in the above-mentioned polyurethane resin.
- the acid value of the cross-linking agent having a carboxyl group is preferably 30 to 50 mgKOH / g, more preferably 35 to 45 mgKOH / g. When the acid value is 30 KOH / g or more, the adhesion to the UV curable resin, particularly the UV curable ink is improved, which is preferable.
- the acid value is 50 mgKOH / g or less
- the water resistance of the coating layer after coating is maintained, and the films do not easily adhere to each other due to moisture absorption, which is preferable.
- other hydrophilic groups such as hydroxyl groups, ethers, sulfonic acids, phosphonic acids, quaternary amines and the like are introduced within a range in which the performance is not deteriorated. You may.
- the cross-linking agent having a carboxyl group examples include an oxazoline compound having a carboxyl group introduced into the molecule, a carbodiimide compound, an epoxy compound, and an isocyanate compound. It is also possible to neutralize the carboxyl group in advance with a basic compound so that the carboxyl group introduced into the molecule does not react intramolecularly or intermolecularly.
- an isocyanate compound in which a carboxyl group can be easily introduced into the molecule is preferable, and a blocked isocyanate compound is particularly preferable.
- the blocking agent examples include heavy sulfite compounds such as sodium bisulfite, 3,5-dimethylpyrazole, 3-methylpyrazole, 4-bromo-3,5-dimethylpyrazole, 4-nitro-3,5-dimethylpyrazole and the like.
- Pyrazole compounds phenols such as phenol and cresol, aliphatic alcohols such as methanol and ethanol, active oximes such as dimethyl malonate and acetylacetone, mercaptans such as butyl mercaptan and dodecyl mercaptan, acids such as acetoanilide and acetate amide.
- examples thereof include amine-based blocking agents such as.
- the lower limit of the boiling point of the blocking agent for the blocked isocyanate is preferably 150 ° C., more preferably 160 ° C., further preferably 180 ° C., particularly preferably 200 ° C., and most preferably 210 ° C.
- the higher the boiling point of the blocking agent the more the volatilization of the blocking agent is suppressed by heat addition in the drying process after coating the coating liquid or in the case of the in-line coating process, and the occurrence of minute unevenness on the coated surface. It is suppressed and the transparency of the film is improved.
- the upper limit of the boiling point of the blocking agent is not particularly limited, but it seems that the upper limit is about 300 ° C. from the viewpoint of productivity.
- the boiling point is related to the molecular weight
- the molecular weight of the blocking agent is preferably 50 or more, more preferably 60 or more, and more preferably 80 or more. Is even more preferable.
- the upper limit of the dissociation temperature of the blocking agent is preferably 200 ° C., more preferably 180 ° C., further preferably 160 ° C., particularly preferably 150 ° C., and most preferably 120 ° C.
- the blocking agent is dissociated by heat addition in the film forming step, and a regenerated isocyanate group is generated. Therefore, the cross-linking reaction with the urethane resin or the like proceeds, and the adhesiveness is improved.
- the dissociation temperature of the blocked isocyanate is equal to or lower than the above temperature, the dissociation of the blocking agent proceeds sufficiently, so that the adhesiveness, particularly the moisture and heat resistance is good.
- Examples of the blocking agent used for the blocked isocyanate of the present invention having a dissociation temperature of 120 ° C. or lower and a boiling point of the blocking agent of 150 ° C. or higher include the above-mentioned sodium bicarbonate, 3,5-dimethylpyrazole, and 3-methylpyrazole. , Dimethyl malonate, diethyl malonate, acetone oxime, methyl ethyl keto oxime and the like. Among them, pyrazole-based compounds typified by 3,5-dimethylpyrazole and 3-methylpyrazole are preferable from the viewpoint of moisture resistance and heat resistance and yellowing.
- the blocked isocyanate is preferably bifunctional or higher, and trifunctional or higher blocked isocyanate is more preferable from the viewpoint of crosslinkability of the coating film.
- the trifunctional or higher functional polyisocyanate which is a precursor of the blocked isocyanate of the present invention can be suitably obtained by introducing an isocyanate monomer.
- an isocyanate monomer examples thereof include a bullet form, an isocyanurate form, and an adduct form obtained by modifying an isocyanate monomer such as an aromatic diisocyanate having two isocyanate groups, an aliphatic diisocyanate, an aromatic aliphatic diisocyanate, or an alicyclic diisocyanate.
- the burette body is a self-condensate having a burette bond formed by self-condensation of an isocyanate monomer, and examples thereof include a burette body of hexamethylene diisocyanate.
- the isocyanurate form is a trimer of an isocyanate monomer, and examples thereof include a trimer of hexamethylene diisocyanate, a trimer of isophorone diisocyanate, and a trimer of tolylene diisocyanate.
- the adduct is a trifunctional or higher functional isocyanate compound obtained by reacting an isocyanate monomer with a trifunctional or higher low molecular weight active hydrogen-containing compound. For example, a compound obtained by reacting trimethyl propane with hexamethylene diisocyanate.
- Examples thereof include a compound obtained by reacting trimethylolpropane and tolylene diisocyanate, a compound obtained by reacting trimethylolpropane and xylylene diisocyanate, and a compound obtained by reacting trimethylolpropane and isophorone diisocyanate.
- isocyanate monomer examples include 2,4-tolylene diisocyanis, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, and 1,5.
- aliphatic diisocyanates such as 1,3-bis (isocyanismethyl) cyclohexane, hexamethylene diisocyanate, and 2,2,4-trimethylhexamethylene diisocyanate.
- Aliphatic diisocyanates Aliphatic, alicyclic isocyanates and modified products thereof are preferable from the viewpoints of transparency, yellowing resistance, adhesiveness and moisture heat resistance.
- the resin to be used in combination examples include a carboxyl group-free polyurethane, a polyester resin, an acrylic resin, a cellulose resin, a polyolefin resin, and a polyacetal resin.
- a polyester resin which improves adhesion to a UV curable resin when used in combination, is particularly preferable.
- the content of the carboxyl group-containing polyurethane resin and the carboxyl group-containing cross-linking agent can be 1.5 times or more the combined content.
- the polyester resin has a better affinity for the polyester resin as the base material than the carboxyl group-containing polyurethane resin or the carboxyl group-containing cross-linking agent, and therefore is easily localized to the base material side in the thickness direction. Because the adhesion with the substrate interface is improved, and the carboxyl group-containing polyurethane resin and the carboxyl group-containing cross-linking agent localized on the surface layer have a synergistic effect of improving the adhesion with the UV curable resin. I'm guessing.
- polyester resin used in combination with the coating layer in the present invention may be linear, but more preferably a diol containing a dicarboxylic acid and one or more diols (glycol) or ether bonds having a branched structure. It is preferable that the polyester resin contains and as a constituent component.
- the main component of the dicarboxylic acid referred to here is terephthalic acid, isophthalic acid or 2,6-naphthalenedicarboxylic acid, as well as aliphatic dicarboxylic acids such as adipic acid and sebacic acid, terephthalic acid, isophthalic acid, phthalic acid, 2, Aromatic dicarboxylic acids such as 6-naphthalenedicarboxylic acid can be mentioned.
- the branched glycol is a diol having a branched alkyl group, for example, 2,2-dimethyl-1,3-propanediol, 2-methyl-2-ethyl-1,3-propanediol, 2-.
- Methyl-2-butyl-1,3-propanediol 2-methyl-2-propyl-1,3-propanediol, 2-methyl-2-isopropyl-1,3-propanediol, 2-methyl-2-n -Hexyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-ethyl-2-n-butyl-1,3-propanediol, 2-ethyl-2-n-hexyl- 1,3-Propanediol, 2,2-di-n-butyl-1,3-propanediol, 2-n-butyl-2-propyl-1,3-propanediol, and 2,2-di-n- Hexil-1,3-propanediol and the like can be mentioned.
- examples of the diol containing one or more ether bonds include condensates of alkylene glycols such as diethylene glycol, triethylene glycol and dipropylene glycol, ethylene oxide of bisphenols or propylene oxide adducts and the like.
- the number of ether bonds in the molecule is not particularly limited, but is preferably 4 or less, more preferably 2 or less, because the strength of the polyester resin or the glass transition point is lowered.
- the diol component containing one or more branched glycol components or ether bonds which is a more preferable embodiment, is preferably in a proportion of 10 mol% or more, more preferably 20 mol, in the total glycol components. It can be said that it is contained in a proportion of% or more. When it is 10 mol% or more, the crystallinity does not become too high and the adhesiveness of the coating layer is maintained, which is preferable.
- the upper limit of the glycol component in the total glycol components is preferably 80 mol% or less, more preferably 70% by mass or less.
- Ethylene glycol is most preferable as the glycol component other than the above compounds.
- Propylene glycol, butanediol, hexanediol, 1,4-cyclohexanedimethanol and the like may be used in small amounts.
- the dicarboxylic acid as a constituent component of the polyester resin is most preferably terephthalic acid or isophthalic acid.
- terephthalic acid or isophthalic acid in order to impart water dispersibility to the copolymerized polyester resin, it is preferable to copolymerize 5-sulfoisophthalic acid or the like in a value range of 1 to 10 mol%, for example, sulfoterephthalic acid. Examples thereof include 5-sulfoisophthalic acid and 5-sodium sulfoisophthalic acid.
- the total solid content of the resin and the cross-linking agent in the coating liquid forming the coating layer is 100% by mass, and the polyester resin content is 10% by mass or more, the adhesion between the coating layer and the polyester film base material becomes poor. Good and preferable.
- the upper limit of the content of the polyester resin is preferably 65% by mass or less, and more preferably 60% by mass or less. When the content of the polyester resin is 70% by mass or less, the moisture and heat resistance after ink processing is good, which is preferable.
- Resins other than the polyester resin described above may be used in the coating layer as long as the performance of the present case is not deteriorated.
- a typical example of a resin other than the polyester resin is a polyurethane resin having a carboxyl group, but other resins may be contained, and only a polyurethane resin having a carboxyl group may be used.
- the content of the resin other than the polyester resin is preferably 40% by mass or less, more preferably 30% by mass or less. It is preferable, and 20% by mass or less is particularly preferable.
- the total content of the resin other than the polyester resin and the polyester resin is preferably 70% by mass or less.
- the content of each of the above-mentioned polyurethane resin and the cross-linking agent in the coating liquid forming the coating layer is preferably 3% by mass or more as the total solid content of the resin and the cross-linking agent.
- the range of the more preferable content is 3.5 to 90% by mass, more preferably 7 to 80% by mass, and particularly preferably 10.5 to 70% by mass.
- additives such as surfactants, antioxidants, heat-resistant stabilizers, weather-resistant stabilizers, ultraviolet absorbers, organic lubricants, and pigments are used as long as the effects of the present invention are not impaired.
- Dyes, organic or inorganic particles, antistatic agents, nucleating agents and the like may be added.
- the particles contained in the coating layer include, for example, titanium oxide, barium sulfate, calcium carbonate, calcium sulfate, silica, alumina, talc, kaolin, clay and the like, or a mixture thereof, and other general ones.
- Inorganic particles such as calcium phosphate, mica, hectrite, zirconia, tungsten oxide, lithium fluoride, calcium fluoride, etc., and organic particles such as styrene, acrylic, melamine, benzoguanamine, silicone, etc. Examples include polymer particles.
- the average particle size of the particles in the coating layer is preferably 0.04 to 2.0 ⁇ m, more preferably 0.1 to 1.0 ⁇ m. Is.
- the average particle size of the inert particles is 0.04 ⁇ m or more, it becomes easy to form irregularities on the film surface, so that the handleability such as slipperiness and winding property of the film is improved, and the film is bonded. Good workability is preferable.
- the average particle size of the inert particles is 2.0 ⁇ m or less, the particles are less likely to fall off, which is preferable.
- the particle concentration in the coating layer is preferably 1 to 20% by mass in the solid component.
- the average particle size of the particles was measured by observing the particles in the cross section of the laminated polyester film with a scanning electron microscope, observing 30 particles, and using the average value as the average particle size.
- the shape of the particles is not particularly limited as long as it satisfies the object of the present invention, and spherical particles and irregular non-spherical particles can be used.
- the particle size of the amorphous particles can be calculated as the equivalent diameter of a circle.
- the equivalent circle diameter is a value obtained by dividing the observed particle area by ⁇ , calculating the square root, and doubling it.
- PET polyethylene terephthalate
- the PET resin After the PET resin is sufficiently vacuum-dried, it is supplied to an extruder, and the molten PET resin at about 280 ° C. is melt-extruded into a sheet on a rotary cooling roll, cooled and solidified by an electrostatic application method, and unstretched PET. Get a sheet.
- the unstretched PET sheet may have a single-layer structure or a multi-layer structure by a coextrusion method.
- the obtained unstretched PET sheet is subjected to uniaxial stretching or biaxial stretching to crystallize it.
- uniaxial stretching a roll heated to 80 to 120 ° C. is stretched 2.5 to 5.0 times in the longitudinal direction to obtain a uniaxially stretched PET film, and then the end of the film is gripped with a clip. Then, it is guided to a hot air zone heated to 80 to 180 ° C. and stretched 2.5 to 5.0 times in the width direction.
- uniaxial stretching it is stretched 2.5 to 5.0 times in the tenter. After stretching, it is continuously guided to the heat treatment zone and heat-treated to complete the crystal orientation.
- the lower limit of the temperature of the heat treatment zone is preferably 170 ° C, more preferably 180 ° C.
- the upper limit of the temperature of the heat treatment zone is preferably 250 ° C., more preferably 240 ° C.
- the temperature of the heat treatment zone is 240 ° C. or lower, the physical properties of the film are not likely to deteriorate, which is preferable.
- the coating layer can be provided after the film is manufactured or in the manufacturing process.
- the coating liquid is applied to at least one side of the PET film which has not been stretched or uniaxially stretched, and is stretched and heat-treated at least in the uniaxial direction to form a coating layer at any stage of the film manufacturing process. Is preferable.
- any known method can be used as the method for applying this coating liquid to the PET film.
- reverse roll coating method gravure coating method, kiss coating method, die coater method, roll brushing method, spray coating method, air knife coating method, wire bar coating method, pipe doctor method, impregnation coating method, curtain coating method, etc.
- spray coating method air knife coating method, wire bar coating method, pipe doctor method, impregnation coating method, curtain coating method, etc.
- These methods can be applied alone or in combination.
- the thickness of the coating layer can be appropriately set in the range of 0.001 to 2.00 ⁇ m, but the range of 0.01 to 1.00 ⁇ m is preferable in order to achieve both processability and adhesiveness. It is more preferably 0.02 to 0.80 ⁇ m, still more preferably 0.05 to 0.50 ⁇ m.
- the thickness of the coating layer is 0.001 ⁇ m or more, the adhesiveness is good, which is preferable.
- the thickness of the coating layer is 2.00 ⁇ m or less, blocking is unlikely to occur, which is preferable.
- the upper limit of the haze of the laminated polyester film of the present invention is preferably 2.5%, more preferably 2.0%, further preferably 1.5%, and particularly preferably 1.2%.
- the haze is 2.5% or less, it is preferable in terms of transparency, and it can also be suitably used for an optical film that requires transparency.
- the smaller the haze the more preferable, but 0.1% or more is preferable, and 0.2% or more is preferable.
- UV curable ink manufactured by T & K TOKA Co., Ltd., trade name "BEST CURE UV161 indigo S” or “BEST CURE UV161 white S”
- a printing machine [Ming Seisakusho Co., Ltd., trade name "RI Tester”]
- print with an ink pipette 4 scales and a 2-split roll and then use a high-pressure mercury lamp on the film coated with the ink layer.
- the ultraviolet curable ink was cured by irradiating with ultraviolet rays of 100 or 40 mJ / cm 2.
- a cellophane adhesive tape (manufactured by Nichiban, No. 405; 24 mm width) is firmly attached to the square-shaped cut surface. After that, the cellophane adhesive tape is vertically peeled off from the ink layer surface of the ink laminated film, the number of squares peeled off from the ink layer surface of the ink laminated film is visually counted, and the ink layer and the film base material adhere to each other from the following formula. Seeking sex.
- Ink adhesion (%) 100- (number of squares peeled off) The ink adhesion was judged according to the following criteria. ⁇ : 100%, ⁇ : 96-99%, ⁇ : 80-95%, ⁇ : less than 80% As a standard, ⁇ or more was accepted.
- Adhesion to the hard coat layer Opstar Z7503 (manufactured by Arakawa Chemical Industry Co., Ltd.), which is a UV curable hard coat agent, is applied onto the coating layer of the laminated polyester film using a # 5 wire bar, and 80 It was dried at ° C. for 1 minute.
- the coated film was irradiated with ultraviolet rays of 100 mJ / cm 2 using a high-pressure mercury lamp to obtain a hard coat film having a thickness of 4 ⁇ m.
- a cutter guide with a gap spacing of 2 mm 100 grid-like cuts that penetrate the hard coat layer and reach the film substrate are made on the hard coat layer surface.
- a cellophane adhesive tape (manufactured by Nichiban, No. 405; 24 mm width) is attached to the cut surface in the shape of a grid and firmly attached. Then, the cellophane adhesive tape was vertically peeled off from the hard coat layer surface of the hard coat laminated film. After performing the adhesive tape adhesion peeling operation at the same location a total of 5 times, the number of squares peeled off from the hard coat layer surface of the hard coat laminated film is visually counted, and the adhesion between the hard coat layer and the film base material is calculated from the following formula. Seeking sex.
- Hard coat adhesion (%) 100- (number of peeled squares) The hard coat adhesion was judged according to the following criteria. ⁇ : 100%, ⁇ : 96-99%, ⁇ : 80-95%, ⁇ : less than 80% As a standard, ⁇ or more was accepted.
- Moisture and heat resistance UV curable ink coating film (BEST CURE UV161 white S coated, UV irradiation, 100 mJ / cm 2 cured product) or hard coat coated film prepared in the same manner as in (4) and (5) above.
- the coating surface was made vertical in an environment of 80 ° C. and 80% RH, and the coating surface was left for 500 hours without contact with other films or the like. After the treatment, it was left in an environment of 23 ° C. and 65% RH for 10 minutes without contact with other films or the like on the coated surface. Immediately after the lapse of time, the adhesion of the coated surface was evaluated in the same manner as described above.
- reaction solution was cooled to 40 ° C., and then 19.8 parts by mass of triethylamine was added to obtain a polyurethane polymer solution.
- 500 g of water was added to a reaction vessel equipped with a homodisper capable of high-speed stirring, the temperature was adjusted to 25 ° C., and the polyurethane polymer solution was added and dispersed in water while stirring and mixing at 2000 min-1. Then, the solvent, methyl ethyl ketone, was removed under reduced pressure.
- concentration with water a solution containing a polyurethane resin (A-1) having an acid value of 37.5 mgKOH / g and having a solid content of 35% by mass was prepared.
- reaction solution was cooled to 40 ° C., and then 16.6 parts by mass of triethylamine was added to obtain a polyurethane polymer solution.
- 500 g of water was added to a reaction vessel equipped with a homodisper capable of high-speed stirring, the temperature was adjusted to 25 ° C., and the polyurethane polymer solution was added and dispersed in water while stirring and mixing at 2000 min-1. Then, the solvent, methyl ethyl ketone, was removed under reduced pressure.
- concentration with water a solution containing a polyurethane resin (A-2) having an acid value of 36.3 mgKOH / g and having a solid content of 35% by mass was prepared.
- reaction solution reached a predetermined amine equivalent.
- reaction solution was cooled to 40 ° C., and then 17.0 parts by mass of triethylamine was added to obtain a polyurethane polymer solution.
- 500 g of water was added to a reaction vessel equipped with a homodisper capable of high-speed stirring, the temperature was adjusted to 25 ° C., and the polyurethane polymer solution was added and dispersed in water while stirring and mixing at 2000 min-1. Then, the solvent, methyl ethyl ketone, was removed under reduced pressure.
- concentration with water a solution containing a polyurethane resin (A-3) having an acid value of 36.0 mgKOH / g and having a solid content of 35% by mass was prepared.
- reaction solution was cooled to 40 ° C., and then 13.3 parts by mass of triethylamine was added to obtain a polyurethane polymer solution.
- 500 g of water was added to a reaction vessel equipped with a homodisper capable of high-speed stirring, the temperature was adjusted to 25 ° C., and the polyurethane polymer solution was added and dispersed in water while stirring and mixing at 2000 min-1. Then, the solvent, methyl ethyl ketone, was removed under reduced pressure.
- concentration with water a solution containing a polyurethane resin (A-4) having an acid value of 25.3 mgKOH / g and having a solid content of 35% by mass was prepared.
- reaction solution was cooled to 40 ° C., and then 8.8 parts by mass of triethylamine was added to obtain a polyurethane polymer solution.
- 500 g of water was added to a reaction vessel equipped with a homodisper capable of high-speed stirring, the temperature was adjusted to 25 ° C., and the polyurethane polymer solution was added and dispersed in water while stirring and mixing at 2000 min-1. Then, the solvent, methyl ethyl ketone, was removed under reduced pressure.
- concentration with water a solution containing a polyurethane resin (A-7) having an acid value of 23.1 mgKOH / g and having a solid content of 35% by mass was prepared.
- a polymerization initiator solution consisting of 18.0 parts by mass of azobis (2-amidinopropane) dihydrochloride and 170.0 parts by mass of water was added from the dropping funnel under a nitrogen atmosphere, and the inside of the flask was kept at 80 ° C. for 2 hours. Dropped. After completion of the dropping, the mixture was stirred at 80 ° C. for 5 hours and then cooled to room temperature. An appropriate amount of water was added to prepare a solution of an oxazoline-based cross-linking agent (B-3) having a solid content of 40% by mass. The acid value corresponding to the solid content of the cross-linking agent B-3 was 39.8 mgKOH / g.
- Polymerization of cross-linking agent B-4 65.0 parts by mass of a polyisocyanate compound (Duranate TPA manufactured by Asahi Kasei Chemicals Co., Ltd.) using hexamethylene diisocyanate as a raw material in a flask equipped with a stirrer, a thermometer, and a reflux cooling tube, N-methylpyrrolidone 17.5. 29.2 parts by mass, 29.2 parts by mass of 3,5-dimethylpyrazole and 21.9 parts by mass of polyethylene glycol monomethyl ether having a number average molecular weight of 500 were added, and the mixture was kept at 70 ° C. for 2 hours under a nitrogen atmosphere.
- a polyisocyanate compound Duranate TPA manufactured by Asahi Kasei Chemicals Co., Ltd.
- Polymerization of cross-linking agent B-5 66.04 parts by mass of polyisocyanate compound (Duranate TPA, manufactured by Asahi Kasei Chemicals), N-methylpyrrolidone 17.50, which has an isocyanurate structure made from hexamethylene diisocyanate in a flask equipped with a stirrer, a thermometer, and a reflux condenser. 25.19 parts by mass of 3,5-dimethylpyrazole was added dropwise to the parts by mass, and the mixture was kept at 70 ° C. for 1 hour under a plain atmosphere. Then, 5.27 parts by mass of dimethylol propionic acid was added dropwise.
- polyisocyanate compound Duranate TPA, manufactured by Asahi Kasei Chemicals
- N-methylpyrrolidone 17.50 which has an isocyanurate structure made from hexamethylene diisocyanate in a flask equipped with a stirrer, a thermometer, and a reflux conden
- polyester resin C-1 194.2 parts by mass of dimethyl terephthalate, 184.5 parts by mass of dimethyl isophthalate, 14.8 parts by mass of dimethyl-5-sodium sulfoisophthalate in a stainless steel autoclave equipped with a stirrer, a thermometer, and a partial reflux condenser. , 233.5 parts by mass of diethylene glycol, 136.6 parts by mass of ethylene glycol, and 0.2 parts by mass of tetra-n-butyl titanate were charged, and a transesterification reaction was carried out at a temperature of 160 ° C. to 220 ° C. for 4 hours.
- polyester resin (C-1) was pale yellow and transparent.
- the reduced viscosity of the polyester resin (C-1) was measured and found to be 0.70 dl / g. Further, 15 parts by mass of polyester resin (C-1) and 15 parts by mass of ethylene glycol n-butyl ether were placed in a reactor equipped with a stirrer, a thermometer and a reflux device, and heated and stirred at 110 ° C. to dissolve the resin.
- polyester resin C-2 194.2 parts by mass of dimethyl terephthalate, 194.2 parts by mass of dimethyl isophthalate, 233.5 parts by mass of diethylene glycol, 136.6 parts by mass of ethylene glycol in a stainless steel autoclave equipped with a stirrer, a thermometer, and a partial reflux condenser. Parts and 0.2 parts by mass of tetra-n-butyl titanate were charged, and a transesterification reaction was carried out at a temperature of 160 ° C. to 220 ° C. for 4 hours. Then, the temperature was raised to 255 ° C., the reaction system was gradually depressurized, and then the reaction was carried out under a reduced pressure of 30 Pa for 1 hour.
- polyester resin (C-2) was pale yellow and transparent.
- the reduced viscosity of the polyester resin (C-2) was measured and found to be 0.35 dl / g.
- 15 parts by mass of polyester resin (C-2) and 15 parts by mass of tetrahydrofuran were placed in a reactor equipped with a stirrer, a thermometer and a reflux device, and heated and stirred at 70 ° C. to dissolve the resin.
- the above antimony trioxide solution was used as a polycondensation catalyst in this BHET mixture and added so as to be 0.04 mol% as an antimony atom with respect to the acid component in the polyester, and then 250 at normal pressure under a nitrogen atmosphere.
- the mixture was stirred at ° C. for 10 minutes.
- the pressure of the reaction system was gradually lowered to 13.3 Pa (0.1 Torr) while raising the temperature to 280 ° C. over 60 minutes, and the polycondensation reaction was further carried out at 280 ° C. and 13.3 Pa for 68 minutes to carry out the intrinsic polycondensation reaction.
- polyester resin E-2 for base material
- antimony trioxide solution As the polycondensation catalyst, a mixture of the above-mentioned solution of the aluminum compound and the solution of the phosphorus compound was used, and 0.014 mol% as aluminum atom and 0.014 mol% of phosphorus atom, respectively, with respect to the acid component in the polyester. It was polymerized in the same manner as the polyester resin E-1 except that it was added so as to be 0.028 mol%. However, by setting the polymerization time to 68 minutes, a polyester resin E-2 having an intrinsic viscosity (IV) of 0.61 dl / and substantially containing no particles was obtained.
- IV intrinsic viscosity
- Example 1 Adjustment of coating liquid The following coating agent is mixed with a mixed solvent (80/20 parts by mass ratio) of water and isopropanol, and the solid of the polyurethane resin (A-1) solution / cross-linking agent (B-1) solution. A coating solution having a fractional mass ratio of 70/30 was prepared.
- This unstretched PET sheet was heated to 100 ° C. with a heated roll group and an infrared heater, and then stretched 3.5 times in the longitudinal direction with a roll group having a peripheral speed difference to obtain a uniaxially stretched PET film.
- the coating liquid was applied to one side of the PET film so that the final (after biaxial stretching) coating amount after drying was 0.13 g / m 2 .
- the coating liquid was stretched 4.0 times in the width direction at 110 ° C., and heated at 230 ° C. for 5 seconds with the width direction of the film fixed. Further, a relaxation treatment in the width direction of 3% was performed to obtain a 100 ⁇ m laminated polyester film.
- the evaluation results are shown in Table 1.
- Example 2 A laminated polyester film was obtained in the same manner as in Example 1 except that the polyurethane resin was set to (A-2) and the ratio of the polyurethane resin to the cross-linking agent was changed to 60/40 (mass ratio).
- Example 3 A laminated polyester film was obtained in the same manner as in Example 1 except that the polyurethane resin was set to (A-3) and the ratio of the polyurethane resin to the cross-linking agent was changed to 50/50 (mass ratio).
- Example 4 A laminated polyester film was obtained in the same manner as in Example 1 except that the cross-linking agent was (B-2) and the ratio of the polyurethane resin and the cross-linking agent was changed to 60/40 (mass ratio).
- Example 5 A laminated polyester film was obtained in the same manner as in Example 1 except that the cross-linking agent was (B-3) and the ratio of the polyurethane resin and the cross-linking agent was changed to 60/40 (mass ratio).
- a laminated polyester film was obtained in the same manner as in Example 1 except that the ratio was changed to 35/10 (mass ratio).
- a laminated polyester film was obtained in the same manner as in Example 1 except that the ratio was changed to 24/40 (mass ratio).
- a laminated polyester film was obtained in the same manner as in Example 1 except that the ratio was changed to 16/60 (mass ratio).
- Example 9 A laminated polyester film was obtained in the same manner as in Example 1 except that the resin pellets of the polyester resin E-2 were used as the film raw material polymer.
- Example 10 A laminated polyester film was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to (A-8).
- Example 1 A laminated polyester film was obtained in the same manner as in Example 1 except that only the polyurethane resin (A-1) was used and no cross-linking agent (B-1) was used.
- Example 2 A laminated polyester film was obtained in the same manner as in Example 1 except that only the cross-linking agent (B-1) was used and the polyurethane resin (A-1) was not used.
- Example 4 A laminated polyester film was obtained in the same manner as in Example 1 except that the polyurethane resin was (A-5) and the ratio of the polyurethane resin to the cross-linking agent was changed to 60/40 (mass ratio).
- Example 5 A laminated polyester film was obtained in the same manner as in Example 1 except that the polyurethane resin was (A-6) and the ratio of the polyurethane resin to the cross-linking agent was changed to 50/50 (mass ratio).
- Example 6 A laminated polyester film was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to (A-7) and the cross-linking agent was changed to (B-5).
- Example 7 A laminated polyester film was obtained in the same manner as in Example 1 except that the cross-linking agent was (B-5) and the ratio of the polyurethane resin to the cross-linking agent was changed to 75/25 (mass ratio).
- Example 10 A laminated polyester film was obtained in the same manner as in Example 1 except that the polyurethane resin (A-1) was changed to the acrylic resin (D-1).
- Table 1 summarizes the evaluation results of each example and comparative example.
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Abstract
Description
このため、従来から、ポリエステルフィルム表面に種々の方法で接着性を与えるための検討がなされてきた
そのため、主に、ポリエステルフィルムの表面に各種樹脂を塗布し、易接着性能を持つ塗布層を設ける方法がよく用いられている
1. ポリエステルフィルムの少なくとも片面にカルボキシル基を有する酸価30~50mgKOH/gのポリウレタン樹脂とカルボキシル基を有する酸価30~50mgKOH/gの架橋剤を含む組成物から形成された塗布層を有する積層ポリエステルフィルム。
2. 架橋剤が、イソシネート系化合物である上記第1に記載の積層ポリエステルフィルム。
本発明においてポリエステルフィルム基材を構成するポリエステル樹脂は、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレン-2,6-ナフタレート、ポリトリメチレンテレフタレートなどのほか、前記のようなポリエステル樹脂のジオール成分又はジカルボン酸成分の一部を以下のような共重合成分に置き換えた共重合ポリエステル樹脂であり、例えば、共重合成分として、ジエチレングリコール、ネオペンチルグリコール、1,4-シクロヘキサンジメタノール、ポリアルキレングリコールなどのジオール成分や、アジピン酸、セバチン酸、フタル酸、イソフタル酸、5-ナトリウムイソフタル酸、2,6-ナフタレンジカルボン酸などのジカルボン酸成分などを挙げることができる。
本発明の積層ポリエステルフィルムは、ハードコート層への接着性、UV硬化型インキへの接着性、ブロッキング耐性を向上させるために、その少なくとも片面に、カルボキシル基を有する酸価30~50mgKOH/gのポリウレタン樹脂とカルボキシル基を有する酸価30~50mgKOH/gの架橋剤から形成されている塗布層が積層されていることが好ましい。塗布層は、ポリエステルフィルムの両面に設けてもよく、ポリエステルフィルムの片面のみに設け、他方の面には異種の樹脂被覆層を設けてもよい。
(カルボキシル基を有する酸価30~50mgKOH/gのポリウレタン樹脂)
カルボキシル基を有するポリウレタン樹脂とは、少なくともポリオール成分とポリイソシアネート成分、さらに必要に応じて鎖延長剤等から合成されるウレタン樹脂であり、分子中または側鎖にカルボキシル基を有するものである。ここでいう分子中とは前記ポリウレタン樹脂の主鎖中または末端に存在するものをいう。また、側鎖とは、分子鎖を構成する前記のようないずれかの原料成分の末端官能基数が3個以上存在することによって、合成、重合された後に枝分かれ上の分子鎖上に導入されたものである。
本発明におけるカルボキシル基を有するポリウレタン樹脂は、主にウレタンの成分としてカルボキシル基含有ポリオール成分を使用することで得られる。
本発明においては、カルボキシル基を有する酸価30~50mgKOH/gの架橋剤を使用する。また、架橋剤のカルボキシル基は先述のポリウレタン樹脂と同様に塩基性化合物で中和されていてもよい。カルボキシル基を有する架橋剤の酸価は、30~50mgKOH/g が好ましく、35~45mgKOH/g がより好ましい。酸価が30KOH/g以上であると、UV硬化性樹脂、特にUV硬化型インキとの密着性が向上するため好ましい。一方、酸価が50mgKOH/g以下であると、塗布後の塗布層の耐水性が保たれ、吸湿してフィルムが相互に固着しやすくなることがなく好ましい。但し、本発明における架橋剤の水溶性あるいは水分散性を補填するために他の親水性基、例えば、水酸基、エーテル、スルホン酸、ホスホン酸、4級アミン等を性能が悪化しない範囲内で導入してもよい。
ビュレット体とは、イソシアネートモノマーが自己縮合して形成したビュレット結合を有する自己縮合物であり、例えば、ヘキサメチレンジイソシアネートのビュレット体などが挙げられる。
イソシアヌレート体とは、イソシアネートモノマーの3量体であり、例えば、ヘキサメチレンジイソシアネートの3量体、イソホロンジイソシアネートの3量体、トリレンジイソシアネートの3量体などが挙げられる。
アダクト体とは、イソシアネートモノマーと3官能以上の低分子活性水素含有化合物とを反応させてなる、3官能以上のイソシアネート化合物をいい、例えば、トリメチロールプロパンとヘキサメチレンジイソシアネートとを反応させた化合物、トリメチロールプロパンとトリレンジイソシアネートとを反応させた化合物、トリメチロールプロパンとキシリレンジイソシアネートとを反応させた化合物、トリメチロールプロパンとイソホロンジイソシアネートとを反応させた化合物、などが挙げられる。
本発明における塗布層に併用するポリエステル樹脂は、直鎖上のものであってもよいが、より好ましくは、ジカルボン酸と、分岐構造を有するジオール(グリコール)またはエーテル結合を1個以上含有するジオールとを構成成分とするポリエステル樹脂であることが好ましい。ここで言うジカルボン酸は、その主成分がテレフタル酸、イソフタル酸又は2,6-ナフタレンジカルボン酸である他アジピン酸、セバシン酸等の脂肪族ジカルボン酸、テレフタル酸、イソフタル酸、フタル酸、2,6-ナフタレンジカルボン酸等の芳香族ジカルボン酸が、挙げられる。また、分岐したグリコールとは枝分かれしたアルキル基を有するジオールであって、例えば、2,2-ジメチル-1,3-プロパンジオール、2-メチル-2-エチル-1,3-プロパンジオール、2-メチル-2-ブチル-1,3-プロパンジオール、2-メチル-2-プロピル-1,3-プロパンジオール、2-メチル-2-イソプロピル-1,3-プロパンジオール、2-メチル-2-n-ヘキシル-1,3-プロパンジオール、2,2-ジエチル-1,3-プロパンジオール、2-エチル-2-n-ブチル-1,3-プロパンジオール、2-エチル-2-n-ヘキシル-1,3-プロパンジオール、2,2-ジ-n-ブチル-1,3-プロパンジオール、2-n-ブチル-2-プロピル-1,3-プロパンジオール、及び2,2-ジ-n-ヘキシル-1,3-プロパンジオールなどが挙げられる。
さらに、エーテル結合を1個以上含有するジオールとしては、ジエチレングリコール、トリエチレングリコール、ジプロピレングリコール等のアルキレングリコールの縮合物、ビスフェノール類のエチレンオキサイドまたはプロピレンオキサイド付加物等が挙げられる。分子中のエーテル結合の個数に特に制限はないが、ポリエステル樹脂の強度またはガラス転移点が低下するため、4個以下、さらには2個以下であることが好ましい。
その場合、塗布層を形成する塗布液中の樹脂及び架橋剤の固形分の総和を100質量%とすると、ポリエステル樹脂以外の樹脂は40質量%以下の含有量が好ましく、30質量%以下がより好ましく、20質量%以下が特に好ましい。但し、ポリエステル樹脂以外の樹脂とポリエステル樹脂の含有量の総和は70質量%以下であることが好ましい。塗布層を形成する塗布液中の前述のポリウレタン樹脂及び架橋剤のそれぞれの含有量は、樹脂及び架橋剤の固形分の総和として3質量%以上であることが好ましい。
3質量%以上であるとUV硬化型樹脂との接着性、UV硬化型インキ等の塗工剤との接着性の効果が得られて好ましい。より好ましい含有量の範囲は3.5~90質量%であり、7~80質量%が更に好ましく、10.5~70質量%が特に好ましい。
本発明における塗布層中には、本発明の効果を阻害しない範囲において公知の添加剤、例えば界面活性剤、酸化防止剤、耐熱安定剤、耐候安定剤、紫外線吸収剤、有機の易滑剤、顔料、染料、有機または無機の粒子、帯電防止剤、核剤等を添加してもよい。
本発明の積層ポリエステルフィルムの製造方法について、ポリエチレンテレフタレート(以下、PETと略記する場合がある)フィルム基材を用いた例を挙げて説明するが、当然これに限定されるものではない。
得られた積層ポリエステルフィルムのヘイズはJIS K 7136:2000に準拠し、濁度計(日本電色製、NDH5000)を用いて測定した。
樹脂及び架橋剤の酸価はJIS K1557-5:2007記載の滴定滴定法により測定した。
但し、アミン等で中和処理されたカルボキシル基の場合は、高温処理によりアミン等を除去するか、予め塩酸等で処理してアミン等を遊離、除去させてから測定した。また、架橋剤の場合は予めイソシアネート等の反応性基をアミン等で反応させた後に測定を実施した。測定する樹脂が溶剤であるイソプロパノールへの溶解性が悪い場合には、代わりにN-メチルピロリドンを使用した。上記等のいずれの処理でも、対比用の測定は十分に実施した。
2枚のフィルム試料を塗布層面同士が対向するように重ね合わせ、98kPaの荷重を掛け、これを50℃の雰囲気下で24時間密着させ、放置した。その後、フィルムを剥離し、その剥離状態を下記の基準で判定した。
○:塗布層の転移がなく軽く剥離できる。
△:塗布層は維持されているが、部分的に塗布層の表層が相手面に転移している。
×:2枚のフィルムが固着し剥離できないもの、あるいは剥離できてもフィルム基材が劈開している。
積層ポリエステルフィルムの塗布層上に、UV硬化型インキ[T&K TOKA(株)製、商品名「BEST CURE UV161藍S」または「BEST CURE UV161白S」]を用いて、印刷機[(株)明製作所製、商品名「RIテスター」]でインクピペット4目盛、2分割ロールにて印刷を施し、次いで、インキ層を塗布したフィルムに高圧水銀灯を用いて100または40mJ/cm2の紫外線を照射し、紫外線硬化型インキを硬化させた。次いで、隙間間隔2mmのカッターガイドを用いて、インキ層を貫通してフィルム基材に達する100個のマス目状の切り傷をインキ層面につける。次いで、セロハン粘着テープ(ニチバン製、405番;24mm幅)をマス目状の切り傷面にしっかり貼り付ける。その後、垂直にセロハン粘着テープをインキ積層フィルムのインキ層面から引き剥がして、インキ積層フィルムのインキ層面から剥がれたマス目の数を目視で数え、下記の式からインキ層とフィルム基材との密着性を求める。なお、マス目の中で部分的に剥離しているものも剥がれたマス目として数えて、下記式の様にインキ密着性を求めた。
インキ密着性(%)=100-(剥がれたマス目の数)
インキ密着性を下記の基準で判定した。
◎:100%、○:96~99%、△:80~95%、×:80%未満
基準として〇以上を合格とした。
積層ポリエステルフィルムの塗布層上に、UV硬化型ハードコート剤であるオプスターZ7503(荒川化学工業(株)製)を#5ワイヤーバーを用いて塗布し、80℃で1分間乾燥した。次いで、塗布したフィルムに高圧水銀灯を用いて100mJ/cm2の紫外線を照射し、ハードコート層の厚みが4μmであるハードコートフィルムを得た。
次いで、隙間間隔2mmのカッターガイドを用いて、ハードコート層を貫通してフィルム基材に達する100個のマス目状の切り傷をハードコート層面につける。次いで、セロハン粘着テープ(ニチバン製、405番;24mm幅)をマス目状の切り傷面に貼り付け、しっかり付着させる。その後、垂直にセロハン粘着テープをハードコート積層フィルムのハードコート層面から引き剥がした。粘着テープ付着剥離操作を同一ヵ所で計5回行った後、ハードコート積層フィルムのハードコート層面から剥がれたマス目の数を目視で数え、下記の式からハードコート層とフィルム基材との密着性を求める。なお、マス目の中で部分的に剥離しているものも剥がれたマス目として数えて、下記式の様にハードコート密着性を求めた。
ハードコート密着性(%)=100-(剥がれたマス目の数)
ハードコート密着性を下記の基準で判定した。
◎:100%、○:96~99%、△:80~95%、×:80%未満
基準として〇以上を合格とした。
上記(4)及び(5)と同様に作成したUV硬化型インキ塗布フィルム(BEST CURE UV161白S塗布後、UV照射、100mJ/cm2硬化品)、またはハードコート塗布フィルムを80℃、80%RHの環境下で塗布面を垂直にし、かつ塗布面に他のフィルム等の接触がない状態で500時間放置した。処理後、23℃、65%RHの環境下に、塗布面に他のフィルム等の接触がない状態で10分間放置した。時間経過直後に塗布面の密着性を先述と同様に評価した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、水添m-キシリレンジイソシアネート82.8質量部、ジメチロールプロピオン酸25.0質量部、1,6-ヘキサンジオール21.0質量部、アジピン酸と1,4-ブタンジオールからなる数平均分子量2000のポリエステルジオール150.0質量部、及び溶剤としてメチルエチルケトン110質量部を投入し、窒素雰囲気下、75℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液を40℃にまで降温した後、トリエチルアミン19.8質量部を添加し、ポリウレタンポリマー溶液を得た。次に、高速攪拌可能なホモディスパーを備えた反応容器に、水500gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンポリマー溶液を添加して水分散した。その後、減圧下で、溶剤であるメチルエチルケトンを除去した。水で濃度調整することにより、酸価37.5mgKOH/gのポリウレタン樹脂(A-1)を含む固形分35質量%の溶液を調製した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、水添m-キシリレンジイソシアネート63.0質量部、ジメチロールプロピオン酸21.0質量部、数平均分子量2000のポリカーボネートジオール(1,6-ヘキサンジオールタイプ)147.0質量部、及び溶剤としてメチルエチルケトン110質量部を投入し、窒素雰囲気下、75℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液を40℃にまで降温した後、トリエチルアミン16.6質量部を添加し、ポリウレタンポリマー溶液を得た。次に、高速攪拌可能なホモディスパーを備えた反応容器に、水500gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンポリマー溶液を添加して水分散した。その後、減圧下で、溶剤であるメチルエチルケトンを除去した。水で濃度調整することにより、酸価36.3mgKOH/gのポリウレタン樹脂(A-2)を含む固形分35質量%の溶液を調製した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、水添ジフェニルメタンジイソシアネート64.5質量部、ジメチロールプロピオン酸21.5質量部、ネオペンチルグリコール11.2質量部、数平均分子量2000のポリカーボネートジオール(1,6-ヘキサンジオールタイプ)150.5質量部、及び溶剤としてメチルエチルケトン110質量部を投入し、窒素雰囲気下、75℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液を40℃にまで降温した後、トリエチルアミン17.0質量部を添加し、ポリウレタンポリマー溶液を得た。次に、高速攪拌可能なホモディスパーを備えた反応容器に、水500gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンポリマー溶液を添加して水分散した。その後、減圧下で、溶剤であるメチルエチルケトンを除去した。水で濃度調整することにより、酸価36.0mgKOH/gのポリウレタン樹脂(A-3)を含む固形分35質量%の溶液を調製した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、水添m-キシリレンジイソシアネート83.4質量部、ジメチロールプロピオン酸16.9質量部、1,6-ヘキサンジオール28.4質量部、アジピン酸と1,4-ブタンジオールからなる数平均分子量2000のポリエステルジオール151.0質量部、及び溶剤としてメチルエチルケトン110質量部を投入し、窒素雰囲気下、75℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液を40℃にまで降温した後、トリエチルアミン13.3質量部を添加し、ポリウレタンポリマー溶液を得た。次に、高速攪拌可能なホモディスパーを備えた反応容器に、水500gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンポリマー溶液を添加して水分散した。その後、減圧下で、溶剤であるメチルエチルケトンを除去した。水で濃度調整することにより、酸価25.3mgKOH/gのポリウレタン樹脂(A-4)を含む固形分35質量%の溶液を調製した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、水添m-キシリレンジイソシアネート104.9質量部、ジメチロールプロピオン酸41.8質量部、1,6-ヘキサンジオール19.0質量部、アジピン酸と1,4-ブタンジオールからなる数平均分子量2000のポリエステルジオール152.0質量部、及び溶剤としてメチルエチルケトン110質量部を投入し、窒素雰囲気下、75℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液を40℃にまで降温した後、トリエチルアミン33.1質量部を添加し、ポリウレタンポリマー溶液を得た。次に、高速攪拌可能なホモディスパーを備えた反応容器に、水500gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンポリマー溶液を添加して水分散した。その後、減圧下で、溶剤であるメチルエチルケトンを除去した。水で濃度調整することにより、酸価55.0mgKOH/gのポリウレタン樹脂(A-5)を含む固形分35質量%の溶液を調製した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、水添m-キシリレンジイソシアネート45.0質量部、1,6-ヘキサンジオール20.0質量部、数平均分子量2000のポリエチレングリコール149.0質量部、及び溶剤としてメチルエチルケトン110質量部を投入し、窒素雰囲気下、75℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液を40℃にまで降温した後、高速攪拌可能なホモディスパーを備えた反応容器に、水500gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンポリマー溶液を添加して水分散した。その後、減圧下で、溶剤であるメチルエチルケトンを除去した。水で濃度調整することにより、酸価0.2mgKOH/gのポリウレタン樹脂(A-6)を含む固形分35質量%の溶液を調製した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、水添ジフェニルメタンジイソシアネート43.8質量部、ジメチロールブタン酸12.9質量部、数平均分子量2000のポリカーボネートジオール(1,6-ヘキサンジオールタイプ)153.4質量部、及び溶剤としてメチルエチルケトン110質量部を投入し、窒素雰囲気下、75℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液を40℃にまで降温した後、トリエチルアミン8.8質量部を添加し、ポリウレタンポリマー溶液を得た。次に、高速攪拌可能なホモディスパーを備えた反応容器に、水500gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンポリマー溶液を添加して水分散した。その後、減圧下で、溶剤であるメチルエチルケトンを除去した。水で濃度調整することにより、酸価23.1mgKOH/gのポリウレタン樹脂(A-7)を含む固形分35質量%の溶液を調製した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、水添ジフェニルメタンジイソシアネート68.0質量部、ジメチロールプロピオン酸19.8質量部、数平均分子量2000のポリカーボネートジオール(1,6-ヘキサンジオールタイプ)148.0質量部、及び溶剤としてメチルエチルケトン110質量部を投入し、窒素雰囲気下、75℃において2時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、2-ブタノン オキシム6.6質量部を投入し、さらに1時間攪拌反応させた。この反応液を40℃にまで降温した後、トリエチルアミン15.7質量部を添加し、ポリウレタンポリマー溶液を得た。次に、高速攪拌可能なホモディスパーを備えた反応容器に、水500gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンポリマー溶液を添加して水分散した。10質量%のエチレンジアミン水溶液1,1質量部を攪拌しつつ添加した。その後、減圧下で、溶剤であるメチルエチルケトンを除去した。水で濃度調整することにより、酸価32.0mgKOH/gのポリウレタン樹脂(A-8)を含む固形分35質量%の溶液を調製した。
撹拌機、温度計、還流冷却管を備えたフラスコにヘキサメチレンジイソシアネート59.5質量部、ネオペンチルグリコール10.7質量部、ジメチロールブタン酸11.0質量部、及び溶剤としてN-メチルピロリドン20.0質量部を投入し、窒素雰囲気下、80℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液に2-ブタノンオキシム29.9質量部を滴下し、さらに窒素雰囲気下、80℃で1時間保持した。その後、反応液の赤外スペクトルを測定し、イソシアネート基の吸収が消失したことを確認後、この反応液を40℃にまで降温して、トリエチルアミン7.9質量部を加えた。そのまま1時間攪拌後、水を適量添加して、固形分40質量%のブロックイソシアネート系架橋剤(B-1)溶液を調整した。架橋剤B-1の固形分相当の酸価は37.6mgKOH/gであった。
撹拌機、温度計、還流冷却管を備えたフラスコにヘキサメチレンジイソシアネートを原料としたイソシアヌレート構造を有するポリイソシアネート化合物(旭化成ケミカルズ製、デュラネートTPA)66.6質量部、N-メチルピロリドン17.5質量部に3,5-ジメチルピラゾール21.7質量部を滴下し、窒素雰囲気下、70℃で1時間保持した。その後、ジメチロールプロピオン酸9.0質量部を滴下した。反応液の赤外スペクトルを測定し、イソシアネート基の吸収が消失したことを確認後、N,N-ジメチルエタノールアミン6.3質量部を加えた。そのまま1時間攪拌後、水を適量添加して、固形分40質量%のブロックイソシアネート系架橋剤(B-2)溶液を調整した。架橋剤B-2の固形分相当の酸価は41.2mgKOH/gであった。
撹拌機、温度計、還流冷却管を備えたフラスコに、水150.0質量部およびメトキシプロピルアルコール250.0質量部を仕込み、窒素雰囲気下、80℃に加熱した。その後、メタクリル酸メチル126.0質量部、2-イソプロペニル-2-オキサゾリン210.0質量部およびメタクリル酸トリエチルアミン53.0質量部からなる単量体混合物と、重合開始剤として2,2’-アゾビス(2-アミジノプロパン)二塩酸塩18.0質量部および水170.0質量部からなる重合開始剤溶液をそれぞれ滴下ロートから窒素雰囲気下、フラスコ内を80℃に保持しつつ2時間かけて滴下した。滴下終了後、80℃、5時間攪拌した後、室温まで冷却した。水を適量添加して、固形分40質量%のオキサゾリン系架橋剤(B-3)溶液を調整した。架橋剤B-3の固形分相当の酸価は39.8mgKOH/gであった。
撹拌機、温度計、還流冷却管を備えたフラスコにヘキサメチレンジイソシアネートを原料としたイソシアヌレート構造を有するポリイソシアネート化合物(旭化成ケミカルズ製、デュラネートTPA)65.0質量部、N-メチルピロリドン17.5質量部、3,5-ジメチルピラゾール29.2質量部、数平均分子量500のポリエチレングリコールモノメチルエーテル21.9質量部を加えて、窒素雰囲気下、70℃で2時間保持した。その後、トリメチロールプロパン4.0質量部を滴下した。反応液の赤外スペクトルを測定し、イソシアネート基の吸収が消失したことを確認後、水280.0質量部を加えた。水を適量添加して、固形分40質量%のブロックポリイソシアネート系架橋剤(B-4)溶液を調整した。架橋剤B-4の固形分相当の酸価は0.0mgKOH/gであった。
撹拌機、温度計、還流冷却管を備えたフラスコにヘキサメチレンジイソシアネートを原料としたイソシアヌレート構造を有するポリイソシアネート化合物( 旭化成ケミカルズ製、デュラネートTPA)66.04質量部、N-メチルピロリドン17.50質量部に3,5-ジメチルピラゾール25.19質量部を滴下し、素雰囲気下、70℃ で1時間保持した。その後、ジメチロールプロピオン酸5.27質量部を滴下した。反応液の赤外スペクトルを測定し、イソシアネート基の吸収が消失したことを確認後、N,N-ジメチルエタノールアミン5.59質量部、水132.5質量部を加えた。水を適量添加して、固形分40質量%のブロックポリイソシアネート系架橋剤(B-5)溶液を調整した。架橋剤B-5の固形分相当の酸価は22.8mgKOH/gであった。
撹拌機、温度計、還流冷却管を備えたフラスコにヘキサメチレンジイソシアネート59.5質量部、ネオペンチルグリコール6.8質量部、ジメチロールブタン酸16.6質量部、及び溶剤としてN-メチルピロリドン20.0質量部を投入し、窒素雰囲気下、80℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液に2-ブタノンオキシム30.3質量部を滴下し、さらに窒素雰囲気下、80℃で1時間保持した。その後、反応液の赤外スペクトルを測定し、イソシアネート基の吸収が消失したことを確認後、この反応液を40℃にまで降温して、トリエチルアミン11.9質量部を加えた。そのまま1時間攪拌後、水を適量添加して、固形分40質量%のブロックイソシアネート系架橋剤(B-6)溶液を調整した。架橋剤B-6の固形分相当の酸価は55.4mgKOH/gであった。
攪拌機、温度計、および部分還流式冷却器を具備するステンレススチール製オートクレーブに、ジメチルテレフタレート194.2質量部、ジメチルイソフタレート184.5質量部、ジメチル-5-ナトリウムスルホイソフタレート14.8質量部、ジエチレングリコール233.5質量部、エチレングリコール136.6質量部、およびテトラ-n-ブチルチタネート0.2質量部を仕込み、160℃から220℃の温度で4時間かけてエステル交換反応を行なった。次いで255℃まで昇温し、反応系を徐々に減圧した後、30Paの減圧下で1時間30分反応させ、共重合ポリエステル樹脂(C-1)を得た。得られたポリエステル樹脂(C-1)は、淡黄色透明であった。ポリエステル樹脂(C-1)の還元粘度を測定したところ,0.70dl/gであった。
さらに、攪拌機、温度計と還流装置を備えた反応器に、ポリエステル樹脂(C-1)15質量部、エチレングリコールn-ブチルエーテル15質量部を入れ、110℃で加熱、攪拌し樹脂を溶解した。樹脂が完全に溶解した後、水70質量部をポリエステル溶液に攪拌しつつ徐々に添加し、添加後、液を攪拌しつつ室温まで冷却した。水を適量添加して、固形分30質量%のポリエステル樹脂(C-1)溶液を調整した。ポリエステル樹脂C-1の固形分相当の酸価は0.9mgKOH/gであった。
攪拌機、温度計、および部分還流式冷却器を具備するステンレススチール製オートクレーブに、ジメチルテレフタレート194.2質量部、ジメチルイソフタレート194.2質量部、ジエチレングリコール233.5質量部、エチレングリコール136.6質量部、およびテトラ-n-ブチルチタネート0.2質量部を仕込み、160℃から220℃の温度で4時間かけてエステル交換反応を行なった。次いで255℃まで昇温し、反応系を徐々に減圧した後、30Paの減圧下で1時間反応させた。さらに、窒素を系中に導入して減圧を解除しつつ、系内を200℃まで冷却した。系中に攪拌しつつ無水トリメリット酸28.0質量部を添加してさらに2時間付加反応させて、ポリエステル樹脂(C-2)を得た。得られたポリエステル樹脂(C-2)は、淡黄色透明であった。ポリエステル樹脂(C-2)の還元粘度を測定したところ,0.35dl/gであった。
さらに、攪拌機、温度計と還流装置を備えた反応器に、ポリエステル樹脂(C-2)15質量部、テトラヒドロフラン15質量部を入れ、70℃で加熱、攪拌し樹脂を溶解した。樹脂が完全に溶解した後、トリエチルアミン31質量部と水70質量部をポリエステル溶液に攪拌しつつ徐々に添加した。添加後、系中を減圧させて、テトラヒドロフランを除去し、室温まで冷却した。水を適量添加して、固形分30質量%のポリエステル樹脂(C-2)溶液を調整した。ポリエステル樹脂C-2の固形分相当の酸価は37.4mgKOH/gであった。
撹拌機、温度計、還流冷却管を備えたフラスコにプロピレングリコールモノメチルエーテル40部を入れ、100℃に加熱保持して、ノルマルブチルアクリレート60.0質量部、メチルメタクリレート42.0質量部、2-ヒドロキシエチルメタクリレート2.9質量部、アクリル酸5.7質量部及びアゾビスイソブチロニトリル5部の混合物を3時間かけて滴下した。滴下後、同温度で2時間熟成させた。その後、この反応液を40℃にまで降温して、トリエチルアミン8.4質量部及び水165質量部を攪拌しながら添加した。そのまま1時間攪拌後、水を適量添加して、固形分35質量%のアクリル樹脂(D-1)溶液を調整した。このアクリル樹脂D-1の固形分相当の酸価は40.1mgKOH/gであった。
(三酸化アンチモン溶液の調製)
三酸化アンチモン(シグマ アルドリッチ ジャパン合同会社製)をエチレングリコールとともにフラスコに仕込み、150℃で4時間攪拌して溶解後、室温まで冷却して、20g/lの三酸化アンチモンのエチレングリコール溶液を調製した。
攪拌機付き2リッターステンレス製オートクレーブに高純度テレフタル酸とその2倍モル量のエチレングリコールを仕込み、トリエチルアミンを酸成分に対して0.3モル%加え、0.25MPaの加圧下250℃にて水を系外に留去しながらエステル化反応を行いエステル化率が約95%のビス(2-ヒドロキシエチル)テレフタレートおよびオリゴマーの混合物(以下BHET混合物という)を得た。このBHET混合物に重縮合触媒として、上記三酸化アンチモン溶液を用い、ポリエステル中の酸成分に対してアンチモン原子として0.04モル%になるように加え、次いで、窒素雰囲気下、常圧にて250℃で10分間攪拌した。その後、60分間かけて280℃まで昇温しつつ反応系の圧力を徐々に下げて13.3Pa(0.1Torr)として、さらに280℃、13.3Paで68分間重縮合反応を実施して、固有粘度(IV)(溶媒:フェノール/テトラクロロエタン=60/40)が0.61dl/であり、粒子を実質上含有していないポリエステル樹脂E-1を得た。
(アルミニウム化合物溶液の調製例)
塩基性酢酸アルミニウム(ヒドロキシアルミニウムジアセテート;シグマ アルドリッチ ジャパン合同会社製)の20g/l水溶液に対して等量(容量比)のエチレングリコールをともにフラスコに仕込み、室温で6時間攪拌した後、減圧(133Pa)下、70~90℃で数時間攪拌しながら系から水を留去し、20g/lのアルミニウム化合物のエチレングリコール溶液を調製した。
リン化合物として3,5-ジ-tert-ブチル-4-ヒドロキシベンジルホスホン酸 ジエチル(Irganox1222(BASF社製))をエチレングリコールとともにフラスコに仕込み、窒素置換下攪拌しながら液温160℃で25時間加熱し、50g/lのリン化合物のエチレングリコール溶液を調製した。
上記アルミニウム化合物の調製例および上記リン化合物の調整例で得られたそれぞれのエチレングリコール溶液をフラスコに仕込み、アルミニウム原子とリン原子がモル比で1:2となるように室温で混合し、1日間攪拌して触媒溶液を調製した。
重縮合触媒として三酸化アンチモン溶液の代わりに、前述のアルミニウム化合物の溶液とリン化合物の溶液の混合物を用いて、ポリエステル中の酸成分に対してアルミニウム原子およびリン原子としてそれぞれ0.014モル%および0.028モル%になるように加えた以外は、ポリエステル樹脂E-1と同様に重合した。但し、重合時間は68分間とすることで、固有粘度(IV)が0.61dl/であり、粒子を実質上含有していないポリエステル樹脂E-2を得た。
(1)塗布液の調整
水とイソプロパノールの混合溶媒(80/20質量部比)に、下記の塗剤を混合し、ポリウレタン樹脂(A-1)溶液/架橋剤(B-1)溶液の固形分質量比が70/30になる塗布液を作成した。
混合溶剤(水/イソプロパノール) 78.26質量部
ポリウレタン樹脂(A-1)溶液 14.00質量部
架橋剤(B-1)溶液 5.25質量部
粒子I 0.12質量部
(平均粒径100nmのシリカゾル、固形分濃度40質量%)
粒子II 1.87質量部 (平均粒径40~50nmのシリカゾル、固形分濃度30質量%)
界面活性剤 0.50質量部
(シリコーン系、固形分濃度10質量%)
フィルム原料ポリマーとして、ポリエステル樹脂E-1の樹脂ペレットを、133Paの減圧下、135℃で6時間乾燥した。その後、押し出し機に供給し、約280℃でシート状に溶融押し出しして、表面温度20℃に保った回転冷却金属ロール上で急冷密着固化させ、未延伸PETシートを得た。
ポリウレタン樹脂を(A-2)とし、ポリウレタン樹脂と架橋剤の比率を60/40(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂を(A-3)とし、ポリウレタン樹脂と架橋剤の比率を50/50(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
架橋剤を(B-2)とし、ポリウレタン樹脂と架橋剤の比率を60/40(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
架橋剤を(B-3)とし、ポリウレタン樹脂と架橋剤の比率を60/40(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂(A-1)、架橋剤(B-1)以外に架橋剤(B-4)を併用し、比率を(A-1)/(B-1)/(B-4)=55/35/10(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂(A-1)、架橋剤(B-1)以外にポリエステル樹脂(C-1)を併用し、比率を(A-1)/(B-1)/(C-1)=36/24/40(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂(A-1)、架橋剤(B-1)以外にポリエステル樹脂(C-1)を併用し、比率を(A-1)/(B-1)/(C-1)=24/16/60(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
フィルム原料ポリマーとして、ポリエステル樹脂E-2の樹脂ペレットを使用した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂を(A-8)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂(A-1)のみを使用し、架橋剤(B-1)を使用しない以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
架橋剤(B-1)のみを使用し、ポリウレタン樹脂(A-1)を使用しない以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂を(A-4)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂を(A-5)とし、ポリウレタン樹脂と架橋剤の比率を60/40(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂を(A-6)とし、ポリウレタン樹脂と架橋剤の比率を50/50(質量比)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂を(A-7)、架橋剤を(B-5)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
架橋剤を(B-5)とし、ポリウレタン樹脂と架橋剤の比率を75/25(質量比)に変更した以外は、実施例1と同様にして同様にして、積層ポリエステルフィルムを得た。
架橋剤を(B-6)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂(A-1)を、ポリエステル樹脂(C-2)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
ポリウレタン樹脂(A-1)を、アクリル樹脂(D-1)に変更した以外は、実施例1と同様にして、積層ポリエステルフィルムを得た。
Claims (2)
- ポリエステルフィルムの少なくとも片面にカルボキシル基を有する酸価30~50mgKOH/gのポリウレタン樹脂とカルボキシル基を有する酸価30~50mgKOH/gの架橋剤を含む組成物から形成された塗布層を有する積層ポリエステルフィルム。
- 架橋剤が、イソシネート系化合物である請求項1に記載の積層ポリエステルフィルム。
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CN117551297A (zh) | 2024-02-13 |
JP2022089835A (ja) | 2022-06-16 |
US11932742B2 (en) | 2024-03-19 |
TW202122274A (zh) | 2021-06-16 |
KR20220094204A (ko) | 2022-07-05 |
JP7207589B2 (ja) | 2023-01-18 |
JP7103507B2 (ja) | 2022-07-20 |
US20220332910A1 (en) | 2022-10-20 |
CN114616284B (zh) | 2024-03-19 |
CN114616284A (zh) | 2022-06-10 |
JPWO2021085327A1 (ja) | 2021-11-25 |
EP4053196A4 (en) | 2023-11-22 |
EP4053196A1 (en) | 2022-09-07 |
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