JP6206165B2 - Film for transfer foil - Google Patents

Description

  The present invention relates to a film for transfer foil, and more specifically to a film for transfer foil that eliminates surface defects on a subject due to a non-transfer surface and satisfies the slipperiness by a manufacturing process or a processing process.

  Generally, a transfer foil is configured by laminating an easy-adhesion layer, a release layer, a printing layer, an adhesive layer, and the like on one surface of a film (transfer foil film) serving as a base material. As a transfer method of these transfer foils, a transfer device is used to transfer to a transfer object with a heating roll, or a so-called hot stamping method, or an adhesive layer is in contact with a mold resin of an injection molding machine or a blow molding machine. After setting the transfer material, injection molding or blowing of molding resin, transfer at the same time as molding, take out the molded product from the mold after cooling, generally known as so-called molding simultaneous transfer method represented by in-mold molding, etc. It has been. In the above transfer method, since the transfer surface side of the transfer foil film is in contact with the material to be transferred, the surface characteristics (surface roughness, protrusion height, etc.) on the transfer surface side may be a problem. Therefore, some proposals have been made to make the surface configuration of the transfer foil film on the transfer surface side constant. In particular, in recent years, there has been a demand for further improvement in order to improve production efficiency and achieve higher designability. For example, if the transfer foil is charged with static electricity during the transfer process, whiskering or dust may adhere during the printing process, causing trouble. In addition, for example, in metal substitutes and building material applications, since the surface of a molded product (transfer object) after transfer is required to have high gloss, smoothing of the transfer surface is required.

  For example, it has been proposed to use a polyethylene terephthalate biaxially oriented film with a specified surface roughness and protrusion height as a base material. According to this proposal, a smoother surface film can be produced (Patent Document 1). reference.).

  Separately, it has been proposed that the film has excellent workability by defining the center line average surface roughness and the content of inert particles (see Patent Document 2). Furthermore, a proposal has been made for a transfer foil that is more excellent in design by controlling the number of protrusions on the transfer surface (see Patent Document 3).

  However, in these proposals, protrusions on the non-transfer surface are pushed out to the transfer surface side, transferred to the transfer object, and pointed out as surface defects of the transfer object. This is due to the fact that the surface design on the transfer surface side has become glossy due to the recent increase in demand for glossy design, which has become smoother and easier. There was a problem that it was impossible to achieve both surface gloss and defect-freeness of the transferred material while imparting lubricity.

  In addition, in film production, the film needs to be easily slippery, and not only the film manufacturing process but also transportability during processing is necessary. Even if it is a large amount of particles or a small amount of particles, particles having a large particle size must be added, and it is generally added to the non-transfer surface side that does not affect the transfer surface side.

JP 2011-212857 A JP 2008-18628 A JP 2006-264135 A

  Therefore, in order to achieve glossiness, it is necessary not only to smooth the surface roughness on the transfer surface side, but also to smooth the surface roughness on the non-transfer surface side. In addition to this, the transportability at the time of processing deteriorates, so that it has been difficult to achieve both.

  The object of the present invention is to eliminate the above-mentioned problems of the prior art, that is, for transfer foils that are smoother on the transfer surface and non-transfer surface, have excellent productivity and workability, and have higher gloss. To provide a film.

The film for transfer foil of the present invention is a film used for transfer foil, and the film is a laminate of a layer having a surface used as a transfer surface (transfer layer) and a layer having a non-transfer surface (non-transfer layer). When the surface of the non-transfer surface opposite to the surface used for the transfer surface was measured under the following conditions, the height of the peak observed in each scan was obtained and found. Obtain the frequency (number of peaks) (number) in increments of 0 nm to 2 nm for the height of each peak, and let a be the height of the peak in increments of 2 nm, and calculate the number of peaks in increments of (a-2) to anm. P (a) is plotted against a as P (a), a giving the maximum P (a) is expressed in a range higher than βnm, βnm, and P (β) / 2 or less When the closest a to βnm shown is γnm, the following formula (1) The layer thickness of the non-transfer layer is 0.1 μm or more and 1.5 μm or less, the non-transfer layer contains particles, and the content of the non-transfer layer is 0. 0 relative to the resin constituting the non-transfer layer. is 20 wt% to 1.00 wt% or less, and said particles of less 0.5μm or more particle size 0.1μm particles, the Rukoto such a combination of particles below 1.5μm or more particle size 0.6μm Characteristic transfer foil film.
P (β + n (γ−β)) / 3 ≦ P (β + (n + 1) × (γ−β)) ≦ P (β + n (γ−β)) / 1.5 Formula (1)
(Where n is an integer from 0 to 3)
Measurement condition:
The surface opposite to the side where the transfer layer of the film is provided is measured under the following conditions using a high-precision fine shape measuring instrument (three-dimensional surface roughness meter) (manufactured by Kosaka Laboratory, ET-4000A). From the measurement data, the frequency (number of peaks) (number) in increments of 2 nm is obtained using a three-dimensional surface roughness analysis program (manufactured by Kosaka Laboratory, TDA-22).
-Stylus: radius of tip 0.5 (μmR), diameter 2.0 (μm), made of diamond ・ Measuring force (needle pressure): 100 (μN)
・ Measurement direction: film longitudinal direction ・ X measurement length: 0.5 (mm)
-X feed speed (measurement speed): 0.1 (mm / s)
・ Y feed pitch (measurement interval): 5 (μm)
-Number of Y lines (number of measurement): 81 (number)
・ Z magnification (vertical magnification): 50000 (times)
・ Low-frequency cut-off (swell cut-off value): 0.25 (mm)
・ High frequency cut-off (roughness cut-off value): R + W (mm)
(Here, the cut-off value R + W means not cut off.)
-Phase characteristics (filter method): 2CR normal type-Maximum number of sample points: 90601 (points)
・ Polarity: Normal ・ X pitch lower limit: 1 (μm)
・ Leveling (tilt correction): None ・ Reference area: 0.2 (mm ² )
The frequency (number of peaks) (number) in increments of 2 nm from 0 nm to peak height is obtained by exceeding 0 nm to 2 nm or less, exceeding 2 nm to 4 nm or less, up to the maximum height range observed, This represents obtaining the number of peaks observed in the range of every 2 nm.

  The X axis (horizontal axis) in FIG. 1 described later means the height (nm) from the base film surface, and the Y axis (vertical axis) means the number of peaks observed in the height range. FIG. 1 is a line graph connecting the numbers of peaks with straight lines. A height range up to 100 nm is shown, with a height of 100 nm or more being on this extension. Reference numeral 1 shown in FIG. 1 is not limited, and is the maximum height (nm) obtained by the measuring instrument in the measurement method of the present invention, that is, the height of P (a) that gives the maximum. It is a range.

  According to a preferable aspect of the film for transfer foil of the present invention, it is preferable that the number of peaks P (200) of the non-transfer surface is 5 or less.

  According to a preferable aspect of the film for transfer foil of the present invention, it is preferable that the number of peaks P (β) of the non-transfer surface is 100 or more.

  According to the preferable aspect of the film for transfer foils of the present invention, the peak number P (100) of the non-transfer surface is 10 or less.

  According to the present invention, by defining the surface structure on the non-transfer surface side, it is possible to obtain a film for transfer foil that can achieve glossiness of the transfer object and less surface defects while satisfying the slipperiness. .

  Moreover, the surface transfer trace can be reduced while maintaining the running property, and a transfer foil film that can improve both glossiness and transfer defect-free particularly when used in transfer foil applications can be obtained.

FIG. 1 is a diagram illustrating the frequency (number of peaks) (number) in increments of 2 nm for each height of the film for transfer foil of the present invention.

  Next, the film for transfer foil of the present invention will be described in detail.

The film for transfer foil of the present invention is a film used for transfer foil, and the film is a laminate of a layer having a surface used as a transfer surface (transfer layer) and a layer having a non-transfer surface (non-transfer layer). When the surface of the non-transfer surface opposite to the surface used for the transfer surface was measured under the following conditions, the height of the peak observed in each scan was obtained and found. Obtain the frequency (number of peaks) (number) in increments of 0 nm to 2 nm for the height of each peak, and let a be the height of the peak in increments of 2 nm, and calculate the number of peaks in increments of (a-2) to anm. P (a) is plotted against a as P (a), a giving the maximum P (a) is expressed in a range higher than βnm, βnm, and P (β) / 2 or less When the closest a to βnm shown is γnm, the following formula (1) The layer thickness of the non-transfer layer is 0.1 μm or more and 1.5 μm or less, the non-transfer layer contains particles, and the content of the non-transfer layer is 0. 0 relative to the resin constituting the non-transfer layer. is 20 wt% to 1.00 wt% or less, and said particles of less 0.5μm or more particle size 0.1μm particles, the Rukoto such a combination of particles below 1.5μm or more particle size 0.6μm Characteristic transfer foil film.
P (β + n (γ−β)) / 3 ≦ P (β + (n + 1) × (γ−β)) ≦ P (β + n (γ−β)) / 1.5 Formula (1)
(Where n is an integer from 0 to 3)
Measurement condition:
The surface opposite to the side where the transfer layer of the film is provided is measured under the following conditions using a high-precision fine shape measuring instrument (three-dimensional surface roughness meter) (manufactured by Kosaka Laboratory, ET-4000A). From the measurement data, the frequency (number of peaks) (number) in increments of 2 nm is obtained using a three-dimensional surface roughness analysis program (manufactured by Kosaka Laboratory, TDA-22).
-Stylus: radius of tip 0.5 (μmR), diameter 2.0 (μm), made of diamond ・ Measuring force (needle pressure): 100 (μN)
・ Measurement direction: film longitudinal direction ・ X measurement length: 0.5 (mm)
-X feed speed (measurement speed): 0.1 (mm / s)
・ Y feed pitch (measurement interval): 5 (μm)
-Number of Y lines (number of measurement): 81 (number)
・ Z magnification (vertical magnification): 50000 (times)
・ Low-frequency cut-off (swell cut-off value): 0.25 (mm)
・ High frequency cut-off (roughness cut-off value): R + W (mm)
(Here, the cut-off value R + W means not cut off.)
-Phase characteristics (filter method): 2CR normal type-Maximum number of sample points: 90601 (points)
・ Polarity: Normal ・ X pitch lower limit: 1 (μm)
・ Leveling (tilt correction): None ・ Reference area: 0.2 (mm ² )
The film for transfer foil of the present invention has the following formula: P (β + n (γ−β)) / 3 ≦ P (β + (n + 1) × (γ−β)) ≦ P (β + n (γ−β)) / 1.5 Meet. When P (β + (n + 1) × (γ−β)) is less than P (β + n (γ−β)) / 3, the surface height is suddenly lowered, and there are many portions with a low surface height, and transfer is performed. Surface defects become noticeable. Further, when P (β + (n + 1) × (γ−β)) is larger than P (β + n (γ−β)) / 1.5, there are many points with high surface height, and glossiness is lowered. .

  As a method for achieving the above surface condition, organic or / and inorganic particles having a specific particle size and particle size distribution are used in the polyester constituting the polyester film layer on the non-transfer surface side, or on the non-transfer surface side. The method of making it contain in the coating-film layer on the polyester film layer of this is mentioned.

  The organic particles used in the above method are styrene, silicone, acrylic acid, methacrylic acid, polyesters, divinyl compounds, and inorganic particles are aggregated silica, spherical silica, colloidal silica, aluminum silicate, titanium oxide, calcium carbonate. , Particles containing calcium phosphate, barium sulfate, aluminum oxide, mica, kaolin, clay and the like as constituent components can be used. Among them, it is preferable to use particles containing organic particles such as styrene, silicone, acrylic acid, methacrylic acid, polyester and divinylbenzene, and inorganic particles such as agglomerated silica, spherical silica, colloidal silica and alumina. . Furthermore, these inorganic particles and organic particles may be used in combination of two or more.

  In the present invention, as a method of satisfying the above formula (1), the number of peaks is 0.01% by mass of particles having a particle diameter of 0.1 μm or more and 1.5 μm or less based on the resin constituting the layer of the non-transfer surface. It is a preferable aspect to contain 2.00 mass% or less. In addition, a particle diameter here means the arithmetic mean particle diameter calculated | required by the measuring method mentioned later.

  If the particle size is less than 0.1 μm, the surface becomes too smooth and the slipperiness may not be satisfied. On the other hand, if the particle diameter is larger than 1.5 μm, surface defects are large and conspicuous, and the design property tends to be impaired. A more preferable particle diameter range of the particles is 0.2 μm to 1.3 μm.

Further, if the content of the particles is less than 0.20 % by mass, it is difficult to impart sufficient slipperiness, and if the content of the particles is more than 1.00 % by mass, the surface is uneven and glossy. May deteriorate. The content of the particles is 0 . It is 20 mass% or more and 1.00 mass% or less.

In addition, the combined use with smaller particles 0.5μm or more particle child size 0.1 [mu] m, particles below a particle element size 0.6 [mu] m or more 1.5 [mu] m, the interlayer when the wound film into a roll air The slipperiness can be expressed with small protrusions while having moderately high protrusions for removing the gap. A more preferable combination is that particles having a size of 0.2 μm or more and 0.4 μm or less are preferably used in combination with particles having a size of 0.6 μm or more and 1.3 μm or less.

Transfer foil film of the present invention is a laminated film comprising two layers even without less, the preferable range of the layer thickness of the non-transfer surface side state, and are more 1.5μm or less 0.1 [mu] m, the good Mashiku 0 .3 μm or more and 1.3 μm or less. When the layer thickness on the non-transfer surface side is less than 0.1 μm, the particle diameter to be contained is too small, so that it is difficult to impart easy slipperiness. If the layer thickness exceeds 1.5 μm, even if small particles are added because the layer thickness is too thick, the height of the surface cannot be controlled and the surface is difficult to be uniform. , Surface defects are likely to occur on the transfer object.

  In the film for transfer foil of the present invention, P (200) is preferably 5 or less. If the number of peaks observed in the height range from 198 nm to 200 nm is more than 5, the difference in height between the protrusions on the surface and the surrounding height becomes particularly significant, and the transferred transfer marks are large. The transferred defect may become conspicuous and the design properties may be impaired. The height range here means the height nm of the X axis (horizontal axis) in FIG. 1 as described above. The number of peaks of P (200) is more preferably 3 or less, and ideally 0. As in the present invention, when the number of peaks is 5 or less, glossiness and design properties are improved.

  In the present invention, by setting the content of particles of 1.3 μm or less to 1.0 mass% or less, the number of peaks observed in the height range from 198 nm to 200 nm can be reduced to 5 or less.

  The preferable total thickness of the film for transfer foil of the present invention is preferably 1 to 50 μm, more preferably 2 to 40 μm, and further preferably 3 to 20 μm from the viewpoints of handling properties and peelability after transfer. .

  Moreover, the preferable range of the layer thickness on the transfer surface side is 3 μm or more and 30 μm or less, and more preferably 5 μm or more and 20 μm or less. When the layer thickness on the transfer surface side is less than 3 μm, the protrusions on the non-transfer surface side are transferred during processing and surface defects are likely to occur. On the other hand, when the layer thickness on the transfer surface side exceeds 30 μm, handling during processing is poor and productivity may be deteriorated.

  The center line surface roughness SRa on the non-transfer surface side of the film for transfer foil of the present invention is preferably 5 nm to 20 nm. When the center line surface roughness SRa is lower than 5 nm, the slipperiness may be impaired. Further, when the center line surface roughness SRa is larger than 20 nm, there are too many surface protrusions, and the transfer trace on the transfer surface side and the transfer trace to the transfer object increase, resulting in a decrease in glossiness. There is. A more preferable range of the center line surface roughness SRa on the non-transfer surface side is 8 nm to 18 nm.

  Further, the center line surface roughness SRa on the transfer surface side is preferably 10 nm or less. This is because the transfer surface side is provided with a transfer object, and therefore does not exert the surface influence on the transfer surface side as much as possible. The center line surface roughness SRa on the transfer surface side is more preferably 8 nm or less, and ideally a surface having no unevenness.

  It is preferable that the heat processing temperature of the film for transfer foils of this invention is the range of 180 to 230 degreeC. When the heat treatment temperature is lower than 180 ° C., the heat shrinkage becomes too large, and handling during processing may be deteriorated. In addition, when the heat treatment temperature exceeds 230 ° C., the film strength becomes low, and it is difficult to peel off when the transfer foil is peeled off. In addition to causing deterioration of handling properties and mold contamination, the protrusions on the surface are remarkable. As a result, transfer tends to occur. A more preferable range of the heat treatment temperature is 190 ° C to 210 ° C.

  In the film for transfer foil of the present invention, P (β) is preferably 100 or more, more preferably 160 or more. When the number of peaks observed in the height range from (β-2) nm to β nm is less than 100, the surface shape is not uniform, so that irregularities are reflected on the surface of the transferred object when transferred. Since many irregular reflections occur on the surface of the transfer object, the glossiness tends to decrease and the design properties tend to be impaired.

  As in the present invention, when the number of peaks observed in the height range from (β-2) nm to β nm is 100 or more, the uniformity of the surface shape becomes high, so that the surface becomes uniform during transfer. As a result, the unevenness of the transferred material is reduced, resulting in an increase in gloss.

  In the present invention, a plurality of particles having a difference between the thickness of the film layer on the non-transfer surface and the particle diameter within ± 0.5 μm are added, and a plurality of the resins constituting the layer on the non-transfer surface are added. By adding 0.1% by mass or more of particles in total, P (β) can be increased to 100 or more.

  In the present invention, P (100) is preferably 10 or less. When the number of peaks observed in the height range of 98 nm to 100 nm is more than 10, the difference in height between the protrusions on the surface and the surrounding height becomes conspicuous, and the transferred defect becomes noticeable. Designability may be impaired. The height range here means the height nm of the X axis (horizontal axis) in FIG. 1 as described above. The number of peaks observed in the height range of 98 nm to 100 nm is more preferably 5 or less, and ideally 0. When the number of peaks is 10 or less as in the present invention, the design properties are greatly improved.

  In the present invention, by adding the amount of particles of 1.5 μm or less to 2.0% by mass or less, P (100) on the surface of the non-transfer surface opposite to the surface used for the transfer surface is 10 or less. Can be made.

  As resin used for the film for transfer foils of this invention, what uses thermoplastic resins, such as polyester, as a structural component is used preferably. Specifically, a polyester resin, a polyamide resin, a polyolefin resin, a polyphenylene sulfide resin, a polyimide resin, a polyetherimide resin, or the like can be used as the thermoplastic resin.

  Polyester is a polymer obtained by condensation polymerization from diol and dicarboxylic acid. Further, dicarboxylic acids are typified by terephthalic acid, isophthalic acid, phthalic acid, naphthalene dicarboxylic acid, adipic acid and sebacic acid, and diols are ethylene glycol, trimethylene glycol, tetramethylene glycol and cyclohexane dicarboxylic acid. It is represented by methanol or the like.

  Specific examples of such polyester include, for example, polyethylene terephthalate, polyethylene-p-oxybenzoate, poly-1,4-cyclohexylenedimethylene terephthalate and polyethylene-2,6-naphthalenedicarboxylate (polyethylene-2,6). -Naphthalate) and the like can be used.

  These polyesters may be homopolyesters or copolyesters. Examples of copolyester copolymer components include diol components such as diethylene glycol, neopentyl glycol and polyalkylene glycol, adipic acid, and sebacic acid. Dicarboxylic acid components such as phthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid and 5-sodium sulfoisophthalic acid can also be used.

  From the viewpoints of strength, heat resistance, water resistance and chemical resistance, polyethylene terephthalate and polyethylene-2,6-naphthalate are particularly preferably used.

  Next, an example of the manufacturing method of the polyester film which comprises the film for transfer foils of this invention is demonstrated.

  The polyester raw material used in the present invention can be produced by various commonly used esterification reactions, transesterification reactions, and subsequent polycondensation reactions. For example, polyethylene terephthalate can be usually produced by a method in which terephthalic acid or dimethyl terephthalate and ethylene glycol are esterified or transesterified, and then polycondensed under reduced pressure. Here, as the catalyst, for example, a compound containing an element such as manganese, magnesium, calcium, titanium, germanium, antimony, and cobalt, a phosphorus compound, or the like can be used. In addition, stabilizers, pigments, dyes, nucleating agents and fillers may be used.

  The polyester thus obtained is formed into particles (chip shape) by a sheet cutting method or a strand cutting method. The shape of the chip may be arbitrary, but if it is too small and becomes a fine powder, it causes troubles in the heat treatment process and the subsequent molding process (especially the extrusion process). Further, when the shape of the chip is large, there is no particular problem in terms of reducing the cyclic compound, but a problem is likely to occur from the viewpoint of operability. From these viewpoints, the size of the polyester chip is preferably 1 mm to 50 mm, more preferably 2 mm to 20 mm in terms of equivalent sphere diameter. Here, the equivalent sphere diameter is the diameter of a sphere having the same volume as the particle.

  For forming the base material layer on the magnetic layer processed surface side, the dried polyester chip is supplied to the extruder A, and for forming the void layer on the running surface side, the polyester chip and preferably the average particle diameter is 300 nm to 1,500 nm. A mixture of less than 6 inert particles, preferably 0.01% by mass to 2.00% by mass, is supplied to the extruder B, melted and introduced into the T-die composite die, and the base is formed in the die. After merging so as to be laminated in two layers of material layer / void layer, it is coextruded into a sheet shape to obtain a melt laminated sheet.

  The melt-laminated sheet thus obtained is preferably cooled and solidified by static electricity on a drum cooled to a surface temperature of 10 to 60 ° C. to produce an unstretched film. The obtained unstretched film is preferably led to a group of rolls heated to a temperature of 70 to 120 ° C., and is preferably stretched 3 to 8 times in the longitudinal direction (longitudinal direction, that is, the traveling direction of the film), preferably 20 to Cool in a roll group at 30 ° C.

  Subsequently, the film is guided to a tenter while holding both ends of the film with clips, and preferably stretched 3 to 6 times in a direction perpendicular to the longitudinal direction (lateral direction) in an atmosphere heated to a temperature of 90 to 150 ° C. A biaxially stretched film is obtained.

  The stretching ratio is preferably 3 to 6 times each in the longitudinal and lateral directions, but the area ratio (longitudinal stretching ratio x lateral stretching ratio) is preferably 15 to 30 times. If the area magnification is less than 15 times, the obtained film strength is insufficient, and conversely if the area magnification exceeds 30 times, the film tends to be broken during stretching.

  In order to complete the crystal orientation of the biaxially stretched film thus obtained and to impart flatness and dimensional stability, the heat treatment is preferably continued at a temperature of 150 to 230 ° C. for 1 to 30 seconds in the tenter. The polyester film can be obtained by gradually cooling and uniformly cooling to room temperature (25 ° C.) and winding.

  During the heat treatment step, a relaxation treatment (relaxation) of about 1 to 12% may be performed in the horizontal direction or the vertical direction as necessary. The biaxial stretching may be simultaneous biaxial stretching in addition to the above-described sequential stretching, and in-line coating in the case of simultaneous biaxial stretching is performed on the surface of an unstretched film obtained by tightly cooling and solidifying a molten sheet on a drum as necessary. After applying the corona discharge treatment, an easy-sliding layer forming coating solution may be applied and stretched. Further, after biaxial stretching, the film may be re-stretched in either the vertical or horizontal direction.

  The polyester film of the present invention thus obtained can be used as an intermediate product to obtain a film roll while being slit and rolled back to the product width using a slitter. The film width of the film roll is preferably 500 to 1,500 mm, and the winding length is preferably 5,000 to 50,000 m.

  In the present invention, the polyester film obtained as described above can be suitably applied as a film for transfer foil, for example, as follows.

  On the transfer surface side of the polyester film, a mixed solution of butylated urea melamine resin and paratoluenesulfonic acid was applied by a gravure coating method and cured at a temperature of 80 ° C. to form a release layer. Next, a release layer is formed on the release layer by gravure coating using an acrylic resin, and a metallic pattern (containing 20% by mass of an aluminum pigment) with a vinyl resin ink is used as a pattern layer on the release layer. Then, a black character pattern (containing 15% by mass of carbon black) is formed by gravure printing, then washed with hot water at 40 ° C. and dried, and finally an adhesive layer of acrylic resin is formed by a gravure coating method. Got.

  The obtained transfer material is vacuum-molded in a mold at a mold temperature of 220 ° C. in a mold of 50 mm × 50 mm and a maximum depth of 8 mm in an atmosphere of a temperature of 25 ° C. and a relative humidity of 30%, and then clamped. Thereafter, simultaneous molding and transfer processing was performed under an injection pressure condition of 25 MPa using acrylic resin as a molding resin.

FIG. 1 is a diagram illustrating the frequency (number of peaks) (number) in increments of 2 nm for each height of the film for transfer foil of the present invention. The X axis (horizontal axis) represents the height (nm) from the base film surface, and the Y axis (vertical axis) represents the number of peaks observed in the height range. Reference numeral 1 shown in FIG. 1 is not limited, and is the maximum height (nm) obtained by the measuring instrument in the measurement method of the present invention, that is, the height of P (a) that gives the maximum. It is a range. The surface roughness of the obtained film for transfer foil was measured with a high-precision fine shape measuring instrument to be described later, the peak height observed in each scan was determined, and the obtained peak height was measured from 0 nm. The frequency (number of peaks) (number) in increments of 2 nm is obtained, and the height of a peak in increments of 2 nm is defined as a, and the number of peaks in increments of (a-2) to an nm is defined as P (a) and P with respect to a Plot (a). The plotted points are connected by straight lines, and a line graph is created as shown in FIG. In the graph thus obtained, a giving the maximum P (a) is βnm (symbol 2), and the most βnm that appears in a range higher than the βnm and shows a value of P (β) / 2 or less. A closest to γ was defined as γnm (symbol 3). Reference numeral 5 is the maximum P (a) of the graph, and reference numeral 6 is P (a) that appears in a range higher than βnm and is closest to βnm and exhibits a value of P (β) / 2 or less. Since a is referred to as γ in the present invention, reference numeral 6 can also be referred to as P (γ). Further, reference numerals 7 and 8 are P (a) obtained by adding n in the height direction every (γ−β) (reference numeral 4) from the height of the point of reference numeral 6. In equation (1),
For example, when n = 0,
P (β) / 3 ≦ P (β + (γ−β)) ≦ P (β) /1.5,
For example, if n = 1,
P (β + (γ−β)) / 3 ≦ P (β + 2 × (γ−β)) ≦ P (β + (γ−β)) / 1.5.

  Further, as a preferred embodiment of the present invention, when the above-mentioned n = 3 P (a) and P (200) are connected by a straight line, it is preferable that all the protrusions at a are present at positions lower than the straight line. .

[Measuring method]
About the following measurement, 10 points | pieces were measured and the average value was made into the measured value.

(1) Center plane roughness (SRa) and frequency in 2 nm increments (number of peaks) (pieces)
The surface opposite to the side where the transfer layer of the film is provided is measured under the following conditions using a high-precision fine shape measuring instrument (three-dimensional surface roughness meter) (manufactured by Kosaka Laboratory, ET-4000A). From the measurement data, a three-dimensional surface roughness analysis program (manufactured by Kosaka Laboratory, TDA-22) was used to determine the frequency (number of peaks) (pieces) in increments of 2 nm.
-Stylus: radius of tip 0.5 (μmR), diameter 2.0 (μm), made of diamond ・ Measuring force (needle pressure): 100 (μN)
・ Measurement direction: film longitudinal direction ・ X measurement length: 0.5 (mm)
-X feed speed (measurement speed): 0.1 (mm / s)
・ Y feed pitch (measurement interval): 5 (μm)
-Number of Y lines (number of measurement): 81 (number)
・ Z magnification (vertical magnification): 50000 (times)
・ Low-frequency cut-off (swell cut-off value): 0.25 (mm)
・ High frequency cut-off (roughness cut-off value): R + W (mm)
(Here, the cut-off value R + W means not cut off.)
-Phase characteristics (filter method): 2CR normal type-Maximum number of sample points: 90601 (points)
・ Polarity: Normal ・ X pitch lower limit: 1 (μm)
Leveling (inclination correction): None - reference area: 0.2 ^(mm 2).

(2) Using a film thickness micrometer (trade name: μ-mate, manufactured by Sony Corporation), the thickness of the biaxially oriented polyester film was measured at 10 locations, and the average value was determined.

(3) Evaluation of surface glossiness A mixed liquid of butylated urea melamine resin and paratoluenesulfonic acid is applied to the transfer surface side of the film by a gravure coating method and cured at a temperature of 80 ° C. to form a release layer. did. Next, a release layer is formed on the release layer by gravure coating using an acrylic resin, and a metallic pattern (containing 20% by mass of an aluminum pigment) with a vinyl resin ink is used as a pattern layer on the release layer. Then, a black character pattern (containing 15% by mass of carbon black) is formed by gravure printing, then washed with hot water at 40 ° C. and dried, and finally an adhesive layer of acrylic resin is formed by a gravure coating method. Got.

The obtained transfer material was vacuum-molded in a mold at a mold temperature of 220 ° C. in a mold of 50 mm × 50 mm and a maximum depth of 8 mm in an atmosphere of a temperature of 25 ° C. and a relative humidity of 30%, and then clamped Thereafter, molding and simultaneous transfer processing were performed under an injection pressure condition of 25 MPa using an acrylic resin as a molding resin. The surface glossiness of 60 ° reflection in Japanese Industrial Standard (JIS) Z-8741 (2004) was measured for the obtained molded product. When the surface glossiness of the molded product was GF and the surface glossiness of the standard metal sample was GM, the following judgment was followed. ○ and △ are acceptable.
○: GF ≧ GM
Δ: GM-20 ≦ GF <GM
X: GF <GM-20.

(4) Evaluation of Transfer Defects Sampling is performed for five sheets each at A4 size from the transfer material obtained by the evaluation method of (3). The transfer mark defect was binarized in a range of 0.352 mm × 0.264 mm with ZYGO (ZYGO, model NV200), and an average of 10 points was taken. ◎ and ○ are acceptable.
◎ ・ ・ ・ Transfer trace defect Less than 4 ○ ・ ・ ・ Transfer trace defect 4 or more, less than 6 Δ ・ ・ ・ Transfer trace defect 6 or more, less than 11 ×× Transfer trace defect 11 or more.

(5) Evaluation of slipperiness The film is wound up on a roll having a width of 1000 mm and a length of 10,000 m (slit speed 150 m / min), and the state of warp, crease and end face deviation of the roll is inspected in detail. Judgment was made as follows. ○ and △ are levels that are not problematic for practical use. Also, winding properties with good level or higher have good running and handling properties and are well correlated.
○: No vertical wrinkles, no wrinkles, and no end face deviation.
Δ: End face deviation is within 1 mm, there is no warp or wrinkle.
X: Wrinkles or wrinkles are observed immediately after roll-up or within 10 hours, or the end face deviation exceeds 1 mm.

(6) Average particle diameter of particles For each particle before being added to the resin (film) at a magnification of 50000 times with a scanning electron microscope (SEM) according to JIS-H7804 (2005), 100 particle diameters are arbitrarily measured. The average particle size is determined. (If the particles are not spherical, approximate the ellipse with the closest shape and obtain the ellipse by (major axis + minor axis) / 2).

[Example 1]
As a dicarboxylic acid component, 82.5 parts by mass of dimethyl terephthalate and 17.5 parts by mass of dimethyl isophthalate, 100 parts by mass of ethylene glycol as a glycol component, and 0.05 parts by mass of magnesium acetate as a catalyst are charged into a reaction vessel, and transesterification is performed. Reaction was performed. Subsequently, 0.03 part by weight of antimony trioxide and 0.05 part by weight of trimethyl phosphate were added to the reaction product, and the reaction system was gradually depressurized to 0.5 mmHg at a temperature of 280 ° C. for polycondensation. Reaction was performed to obtain polyethylene terephthalate raw material A.

  As a raw material (raw material A) for the transfer surface (hereinafter referred to as A layer), spherical silica having an average particle diameter of 70 nm is added to a polyethylene terephthalate raw material A (inherent viscosity IV0.66) substantially free of inert particles. The raw material A contained in an amount of 05% by mass and the non-transfer surface (hereinafter referred to as B layer) are 0.26% by mass of spherical silica having an average particle size of 300 nm and the spherical shape having an average particle size of 800 nm in the same polyethylene terephthalate raw material A. A raw material B containing 0.01% by mass of silica was prepared, and coextruded so that the thickness ratio of the A layer and the B layer was 6.1: 0.4. The total discharge amount of the raw materials A and B was adjusted so that the total thickness of the polyester film was the total thickness shown in Table 1.

  This was cooled and solidified on a casting drum to obtain an unstretched film, and then stretched 4.2 times in the longitudinal direction at a temperature of 105 ° C. Next, the film was stretched 5.0 times in the width direction at a temperature of 98 ° C. using a tenter, heat-treated at a temperature of 205 ° C. to obtain a polyester film, and a polyester film roll was obtained while winding. Tables 1 and 2 show characteristics and the like, and Table 3 shows film forming conditions and the like.

[Examples 2 to 4, Reference Example 1 , Comparative Examples 1 to 4]
Except as described in Table 1, a polyester film was obtained in the same manner as in Example 1. Thereafter, a polyester film roll was obtained in the same manner as in Example 1. These characteristics and the like are shown in Tables 1 and 2 , and the film forming conditions and the like are shown in Table 3.

1 P (a) height range giving the maximum a (nm)
2 Gives maximum P (a) a: β (nm)
3: Appearing in a range higher than β nm and showing a value of P (β) / 2 or less, closest to β nm, a: γ (nm)
4 (γ-β) (nm)
5 is the maximum P (a) and P (β).
P (a) that appears in a range higher than 6 βnm and is closest to βnm and exhibits a value of P (β) / 2 or less
7, 8 P (a) corresponding to the height where (γ−β) (reference numeral 4) is set to n = 2 and n = 3 in the height direction from γ.

Claims (5)

A film used for transfer foil,
The film is a film formed by laminating a layer having a surface used as a transfer surface (transfer layer) and a layer having a non-transfer surface (non-transfer layer),
When measuring the non-transfer surface opposite to the surface used for the transfer surface under the following conditions:
Find the peak heights observed in each scan,
Obtain the frequency (number of peaks) (number) in increments of 0 nm to 2 nm for each obtained peak height,
P (a) is plotted against a, where a is the height of the peak with 2 nm steps, and P (a) is the number of peaks with step widths of (a-2) to anm.
A giving the maximum P (a) is β nm,
When a that appears in a range higher than βnm and that is closest to βnm and exhibits a value of P (β) / 2 or less is γnm, the following formula (1) is satisfied :
The layer thickness of the non-transfer layer is 0.1 μm or more and 1.5 μm or less,
The non-transfer layer contains particles, and the content thereof is 0.20% by mass or more and 1.00% by mass or less based on the resin constituting the non-transfer layer,
Transfer foil film that the particles are characterized with the following particle 0.5μm or more particle size 0.1 [mu] m, the Rukoto such a combination of particles below 1.5μm or more particle size 0.6 .mu.m.
P (β + n (γ−β)) / 3 ≦ P (β + (n + 1) × (γ−β)) ≦ P (β + n (γ−β)) / 1.5 Formula (1)
(Where n is an integer from 0 to 3)
Measurement condition:
The surface opposite to the side where the transfer layer of the film is provided is measured under the following conditions using a high-precision fine shape measuring instrument (three-dimensional surface roughness meter) (manufactured by Kosaka Laboratory, ET-4000A). From the measurement data, the frequency (number of peaks) (number) in increments of 2 nm is obtained using a three-dimensional surface roughness analysis program (manufactured by Kosaka Laboratory, TDA-22).
-Stylus: radius of tip 0.5 (μmR), diameter 2.0 (μm), made of diamond ・ Measuring force (needle pressure): 100 (μN)
・ Measurement direction: film longitudinal direction ・ X measurement length: 0.5 (mm)
-X feed speed (measurement speed): 0.1 (mm / s)
・ Y feed pitch (measurement interval): 5 (μm)
-Number of Y lines (number of measurement): 81 (number)
・ Z magnification (vertical magnification): 50000 (times)
・ Low-frequency cut-off (swell cut-off value): 0.25 (mm)
・ High frequency cut-off (roughness cut-off value): R + W (mm)
(Here, the cut-off value R + W means not cut off.)
-Phase characteristics (filter method): 2CR normal type-Maximum number of sample points: 90601 (points)
・ Polarity: Normal ・ X pitch lower limit: 1 (μm)
・ Leveling (tilt correction): None ・ Reference area: 0.2 (mm ² ) The film for transfer foil according to claim 1, wherein the surface roughness SRa of the non-transfer surface is 5 nm to 20 nm. The film for transfer foil according to claim 1 or 2 , wherein P (200) is 5 or less. The film for transfer foil according to any one of claims 1 to 3, wherein P (β) is 100 or more. The film for transfer foil according to any one of claims 1 to 4 , wherein P (100) is 10 or less.