Decorative base material film

Abstract

To provide a base material film capable of composing a decorative film, excellent in all of formability, heat resistance, glossiness and slipperiness.SOLUTION: In a decorative base material film 1, a displacement magnitude at 100°C is 5% or less and a displacement magnitude at 120°C is 10% or more, when a thermomechanical analysis is applied to the decorative base material film 1. An arithmetical average height (Sa) is 0.1 μm or less at a first face 1a or a second face 1b, or the first face 1a and the second face 1b of the decorative base material film. A dynamic friction coefficient is 0.5 or less between first faces 1a or between second faces 1b, or between the first face 1a and the second face 1b of the decorative base material film 1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a base film for decoration. [Background technology]

[0002] The surface of an automobile body is usually painted, mainly for the purpose of preventing rust and dirt on the surface of the automobile body and for the purpose of improving the design of the automobile. In recent years, plastic films are sometimes applied to the painted surface of the car body. The main purpose is to improve the design of the car by changing the color and texture of the car body surface. Plastic films used for this purpose are sometimes called decorative films.

[0003] Furthermore, decorative films are expected to serve as an alternative to conventional painted coatings. The painting process involves applying paint by spraying and drying, making it difficult to reduce the time required. In addition, the paint used contains many volatile and harmful components, so painting must be done in a dedicated environment that ensures safety. In addition, it is desirable to reduce the amount of volatile organic solvents and carbon dioxide emitted when using paint. As described above, there are various restrictions on painting, so simplification and replacement of painting are desired, and this may be achieved by using decorative films. In addition, the use of decorative films is expected to produce new functions that were not possible with conventional paint films.

[0004] As a conventional decorative film, a resin film containing polymethyl methacrylate (PMMA) as a main component is known (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4291994 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the decorative film disclosed in Patent Document 1 has a problem in that it has insufficient formability because it is mainly composed of polymethyl methacrylate. Furthermore, when attempting to improve the formability of the decorative film, there has been a problem in that any of the other properties required of the decorative film, namely, formability, heat resistance, glossiness, and slipperiness, is reduced.

[0007] An object of the present invention is to provide a base film which can be used to form a decorative film and which is excellent in all of formability, heat resistance, gloss and slipperiness. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention employs the following configuration. [1] A base film for decoration, wherein, when a thermomechanical analysis is performed on the base film for decoration, the amount of displacement at 100°C is 5% or less and the amount of displacement at 120°C is 10% or more, the arithmetic mean height (Sa) of one or both sides of the base film for decoration is 0.1 μm or less, and the dynamic friction coefficient between the surfaces of the base film for decoration is 0.5 or less. [2] The base film for decoration according to [1], wherein the total light transmittance of the base film for decoration is 85% or more, and the haze of the base film for decoration measured in accordance with JIS K 7136:2000 is 10% or less. [3] The base film for decoration according to [1] or [2], wherein the base film for decoration contains a glycol-modified polyethylene terephthalate, and the glycol-modified polyethylene terephthalate is polyethylene terephthalate modified with one or more selected from the group consisting of cyclohexanedimethanol, isosorbide, and 2,2,4,4-tetramethyl-1,3-cyclobutanediol. [4] The base film for decoration according to any one of [1] to [3], wherein the transmittance of the base film for decoration to ultraviolet light with a wavelength of 360 nm is 1% or less. Effect of the Invention

[0009] According to the present invention, there is provided a base film which can be used to form a decorative film and which is excellent in all of formability, heat resistance, gloss and slipperiness. [Brief description of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view showing a schematic example of a decorative substrate film according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] <<Decorative base film>> In one embodiment of the present invention, when a thermomechanical analysis (TMA) is performed on the base film for decoration, the base film for decoration has a displacement at 100°C (sometimes referred to herein as "A(100°C)") of 5% or less and a displacement at 120°C (sometimes referred to herein as "A(120°C)") of 10% or more, an arithmetic mean height (Sa) (sometimes referred to herein simply as "Sa") of one side (sometimes referred to herein as the "first side" or "second side") or both sides of the base film for decoration is 0.1 μm or less, and a dynamic friction coefficient between the sides of the base film for decoration is 0.5 or less. The base film for decoration of the present embodiment is a base film for forming a decorative film, and can be laminated with other films to form a decorative film. The base film for decoration of the present embodiment has the above-mentioned configuration, and is therefore excellent in all of formability, heat resistance, glossiness, and slipperiness.

[0012] <Glycol modified polyethylene terephthalate (PETG)> In order to more easily improve the formability, heat resistance, gloss, and slipperiness of the decorative base film of this embodiment, it is preferable that the decorative base film contains glycol-modified polyethylene terephthalate (sometimes referred to as "PETG" in this specification).

[0013] The base film for decoration may contain only one type of glycol-modified polyethylene terephthalate, or two or more types. When two or more types are contained, the combination and ratio thereof can be arbitrarily selected according to the purpose.

[0014] As used herein, "glycol-modified polyethylene terephthalate" refers to a polyester having a structure in which a portion of the total number of constitutional units derived from ethylene glycol (HO-CHCH-OH) in polyethylene terephthalate is replaced with constitutional units derived from a glycol other than ethylene glycol.

[0015] A preferred glycol-modified polyethylene terephthalate (PETG) has a structural unit derived from ethylene glycol as a structural unit derived from glycol, and further has a structural unit derived from cyclohexanedimethanol (HO-CH-CH) such as 1,4-cyclohexanedimethanol. 10 and a glycol-modified polyethylene terephthalate having one or more structural units selected from the group consisting of a structural unit derived from isosorbide represented by the following formula, and a structural unit derived from 2,2,4,4-tetramethyl-1,3-cyclobutanediol.

[0016] [ka]

[0017] That is, the glycol-modified polyethylene terephthalate contained in the decorative base film is preferably polyethylene terephthalate modified with one or more selected from the group consisting of cyclohexanedimethanol, isosorbide, and 2,2,4,4-tetramethyl-1,3-cyclobutanediol.

[0018] In this specification, "polyethylene terephthalate modified with cyclohexanedimethanol" means "glycol-modified polyethylene terephthalate which has structural units derived from ethylene glycol and structural units derived from cyclohexanedimethanol, and which may or may not have structural units derived from other glycols not corresponding to either ethylene glycol or cyclohexanedimethanol." Similarly, "isosorbide-modified polyethylene terephthalate" means "a glycol-modified polyethylene terephthalate having a structural unit derived from ethylene glycol and a structural unit derived from isosorbide, and which may or may not have a structural unit derived from another glycol that does not fall under either ethylene glycol or isosorbide." Similarly, "polyethylene terephthalate modified with 2,2,4,4-tetramethyl-1,3-cyclobutanediol" means "a glycol-modified polyethylene terephthalate which has structural units derived from ethylene glycol and structural units derived from 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and which may or may not have structural units derived from other glycols not corresponding to either ethylene glycol or 2,2,4,4-tetramethyl-1,3-cyclobutanediol."

[0019] Among the above glycol-modified polyethylene terephthalates, in particular, glycol-modified polyethylene terephthalates having a structural unit derived from ethylene glycol, a structural unit derived from cyclohexanedimethanol, and either or both of a structural unit derived from isosorbide and a structural unit derived from 2,2,4,4-tetramethyl-1,3-cyclobutanediol are useful for reducing A(100°C) described below. That is, such glycol-modified polyethylene terephthalates are useful as resin components for improving the heat resistance of base films for decoration.

[0020] Among the above glycol-modified polyethylene terephthalates, those having a glass transition point of 80° C. or higher are particularly useful as a resin component that improves the heat resistance of a base film for decoration. The glass transition point of such glycol-modified polyethylene terephthalate may be, for example, either 85° C. or higher or 90° C. or higher. The higher the glass transition point of the glycol-modified polyethylene terephthalate, the more the heat resistance of the base film for decoration tends to improve. The upper limit of the glass transition point of the glycol-modified polyethylene terephthalate is not particularly limited. For example, glycol-modified polyethylene terephthalate having a glass transition point of 100° C. or less is easy to produce or obtain. In one embodiment, the glass transition point of the glycol-modified polyethylene terephthalate may be, for example, any one of 80 to 100° C., 85 to 100° C., and 90 to 100° C. However, these are only examples of the glass transition point.

[0021] <Other ingredients> The base film for decoration according to the present embodiment, which contains glycol-modified polyethylene terephthalate (PETG), may or may not contain other components that do not fall under the category of PETG. The other components may be either resin components or non-resin components.

[0022] The base film for decoration may contain only one type of other component, or two or more types. When there are two or more types, the combination and ratio thereof can be arbitrarily selected depending on the purpose.

[0023] Among the other components, examples of the resin component include polyesters other than glycol-modified polyethylene terephthalate (hereinafter, sometimes referred to as "other polyesters"), such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), etc. Among these, polybutylene terephthalate (PBT) is suitable as a resin component that improves the heat resistance of the decorative substrate film.

[0024] Among the other components, examples of the non-resin components include antiblocking agents, ultraviolet absorbers (weather resistance agents), antifogging agents, antioxidants, antistatic agents, crystal nucleating agents, viscosity reducers, thickeners, thermal stabilizers, lubricants, and infrared absorbers.

[0025] As described later, the antiblocking agent is suitable as a component for increasing the slipperiness of the base film for decoration. More specific examples of the antiblocking agent include inorganic particles such as silica particles, and organic particles such as benzoguanamine-formaldehyde condensate particles.

[0026] The average particle size of the antiblocking agent is preferably 8 μm or less, and may be, for example, 6 μm or less. When the average particle size of the antiblocking agent is equal to or less than the upper limit, the arithmetic mean height (Sa) of the first surface 1a of the base film for decoration 1 can be easily reduced, for example, more easily set to 0.1 μm or less. On the other hand, the average particle size of the antiblocking agent is preferably 1 μm or more, in order to obtain a more pronounced effect from the use of the antiblocking agent. In one embodiment, the average particle size of the antiblocking agent may be, for example, any one of 1 to 8 μm and 1 to 6 μm, although these are only examples of the average particle size.

[0027] In the base film for decoration of this embodiment, the ratio of the content of glycol-modified polyethylene terephthalate to the total mass of the base film for decoration ([content of glycol-modified polyethylene terephthalate in base film for decoration (parts by mass)] / [total mass of base film for decoration]×100) is preferably 75 to 100% by mass, and may be, for example, any of 85 to 100% by mass and 90 to 100% by mass, any of 75 to 95% by mass and 75 to 85% by mass, or may be 85 to 95% by mass. In other words, in the base film for decoration of this embodiment, the content ratio of the other components relative to the total mass of the base film for decoration is preferably 0 to 25 mass%, and may be, for example, any of 0 to 15 mass% and 0 to 10 mass%, or any of 5 to 25 mass% and 15 to 25 mass%, or may be 5 to 15 mass%.

[0028] <A(100℃)> When the base film for decoration of this embodiment is subjected to thermomechanical analysis (TMA), the amount of displacement (A(100°C)) at 100°C is 5% or less. When A(100°C) of the base film for decoration is equal to or less than the upper limit, the heat resistance of the base film for decoration is increased.

[0029] The A(100°C) of the base film for decoration is preferably 4.3% or less, and may be, for example, 3.6% or less or 2.9% or less. The smaller the A(100°C) is, the higher the heat resistance of the base film for decoration tends to be. The lower limit of A(100° C.) of the base film for decoration is not particularly limited. For example, a base film for decoration having A(100° C.) of 1.5% or more can be produced more easily. In one embodiment, A(100°C) of the base film for decoration may be, for example, any one of 1.5 to 5%, 1.5 to 4.3%, 1.5 to 3.6%, and 1.5 to 2.9%, although these are only examples of A(100°C).

[0030] The A(100°C) of the base film for decoration can be adjusted by adjusting the type or content of the components contained in the base film for decoration, or the thickness of the base film for decoration. For example, A(100°C) can be easily reduced by making the base film for decoration contain glycol-modified polyethylene terephthalate (PETG) or by increasing the content of PETG in the base film for decoration.

[0031] In order to reduce A(100° C.), preferred glycol-modified polyethylene terephthalate includes polyethylene terephthalate modified with cyclohexanedimethanol and either or both of isosorbide and 2,2,4,4-tetramethyl-1,3-cyclobutanediol.

[0032] <A(120℃)> When the base film for decoration of this embodiment is subjected to thermomechanical analysis (TMA), the amount of displacement (A(120°C)) at 120°C is 10% or more. When the A(120°C) of the base film for decoration is equal to or greater than the lower limit, the formability of the base film for decoration is improved.

[0033] The A(120°C) of the base film for decoration is preferably 16% or more, and may be, for example, 22% or more or 30% or more. The larger A(120°C) is, the higher the formability of the base film for decoration tends to be. The upper limit of A(120°C) of the base film for decoration is not particularly limited. For example, a base film for decoration having A(120°C) of 45% or less can be produced more easily. In one embodiment, A(120°C) of the base film for decoration may be, for example, any one of 10 to 45%, 16 to 45%, 22 to 45%, and 30 to 45%, although these are only examples of A(120°C).

[0034] The A(120°C) of the base film for decoration can be adjusted by adjusting the type or content of the components contained in the base film for decoration, or the thickness of the base film for decoration. For example, A(120°C) can be easily increased by making the base film for decoration contain glycol-modified polyethylene terephthalate (PETG) or by increasing the content of glycol-modified polyethylene terephthalate in the base film for decoration.

[0035] In order to increase A(120°C), a preferred example of a glycol-modified polyethylene terephthalate is a polyethylene terephthalate modified with cyclohexanedimethanol, for example, a glycol-modified polyethylene terephthalate having, as the structural units derived from glycol, a structural unit derived from ethylene glycol and a structural unit derived from cyclohexanedimethanol, which may or may not have either or both of a structural unit derived from isosorbide and a structural unit derived from 2,2,4,4-tetramethyl-1,3-cyclobutanediol.

[0036] The base film for decoration of the present embodiment preferably satisfies both any one of the above-mentioned preferable numerical ranges for A(100° C.) and any one of the above-mentioned preferable numerical ranges for A(120° C.).

[0037] <Arithmetic mean height of surface (Sa)> The arithmetic mean height (Sa) of one or both sides of the base film for decoration of this embodiment is 0.1 μm or less. When the Sa of the surface of the base film for decoration is the upper limit value or less, the surface has high smoothness and the base film for decoration has high gloss.

[0038] The surface Sa of the base film for decoration is preferably 0.085 μm or less, and may be, for example, 0.07 μm or less or 0.06 μm or less. The smaller Sa is, the higher the gloss of the base film for decoration tends to be. The lower limit of Sa of the surface of the base film for decoration is not particularly limited. For example, a base film for decoration having Sa of 0.02 μm or more can be produced more easily. In one embodiment, the surface Sa of the base film for decoration may be, for example, any one of 0.02 to 1 μm, 0.02 to 0.085 μm, 0.02 to 0.07 μm, and 0.02 to 0.06 μm, although these are merely examples of Sa.

[0039] In this embodiment, it is preferable that Sa on both sides of the base film for decoration is 0.1 μm or less.

[0040] The surface area Sa of the base film for decoration can be adjusted by adjusting the type or content of the components contained in the base film for decoration. For example, the base film for decoration can be made small by not containing coarse particles having an average particle size of a specific value or more, or by making the base film for decoration have a small content of coarse particles.

[0041] In this specification, "arithmetic mean height (Sa)" means that measured in accordance with ISO 25178, unless otherwise specified.

[0042] <Coefficient of kinetic friction between surfaces> The dynamic friction coefficient between the surfaces of the base film for decoration in this embodiment is 0.5 or less. The dynamic friction coefficient is equal to or less than the upper limit, so that the base film for decoration has high slipperiness. As a result, for example, when the base films for decoration are superimposed on each other, the base films for decoration slide easily, and the handleability of the base films for decoration is good. Furthermore, the surface of the base film for decoration is less likely to be scratched.

[0043] The coefficient of dynamic friction between the surfaces of the base film for decoration is preferably 0.45 or less, and may be, for example, either 0.42 or less or 0.39 or less. The smaller the coefficient of dynamic friction, the higher the slipperiness of the base film for decoration tends to be. The lower limit of the dynamic friction coefficient between the surfaces of the base film for decoration is not particularly limited. For example, a base film for decoration having a dynamic friction coefficient of 0.2 or more can be produced more easily. In one embodiment, the dynamic friction coefficient between the surfaces of the base film for decoration may be, for example, any one of 0.2 to 0.5, 0.2 to 0.45, 0.2 to 0.42, and 0.2 to 0.39, although these are just examples of the dynamic friction coefficient.

[0044] In the decorative base film, any one or more of the kinetic friction coefficient between one side of the base film (sometimes referred to in this specification as "kinetic friction coefficient (i)"), the kinetic friction coefficient between the other side opposite the one side of the base film (sometimes referred to in this specification as "kinetic friction coefficient (ii)"), and the kinetic friction coefficient between the one side and the other side (sometimes referred to in this specification as "kinetic friction coefficient (iii)") satisfy the above-mentioned numerical range (e.g., 0.5 or less). All of the kinetic friction coefficient (i), kinetic friction coefficient (ii) and kinetic friction coefficient (iii) may satisfy the above-mentioned numerical range (e.g., 0.5 or less), and it is preferable that the kinetic friction coefficient (iii) satisfies the above-mentioned numerical range (e.g., 0.5 or less).

[0045] The dynamic friction coefficient between the surfaces of the base film for decoration can be measured by the following method. That is, a test laminate was prepared by overlapping the exposed surfaces of the decorative substrate films, and a 40 cm2 area of ​​the surface of the test laminate (the exposed surface opposite to the overlapping surface) was 2 A weight is placed on this area to apply a load of 200 g, and the decorative base film on the side in contact with the weight is pulled at a test speed of 150 mm / min with the weight still placed on it (load applied), and the dynamic friction coefficient can be calculated from the load at this time. In the test laminate, it is preferable to match the machine direction (MD) of the resin in both overlapping base films for decoration, and it is preferable to match the pulling direction of the base film for decoration in the test laminate with the MD of the resin in both base films for decoration. Here, matching the machine direction (MD) of the resin in both base films for decoration is synonymous with matching the direction perpendicular to the MD (transverse direction, TD) of both base films for decoration. In other words, the dynamic friction coefficient between the surfaces of the base film for decoration can be measured in accordance with JIS K 7125:1999 ((ISO 8295:1995)), except that the test speed when pulling the base film for decoration is 150 mm / min instead of 100 mm / min.

[0046] The dynamic friction coefficient between the surfaces of the base film for decoration can be adjusted by adjusting the type of components contained in the base film for decoration or the content thereof. For example, the dynamic friction coefficient can be easily reduced by making the base film for decoration contain fine particles having an average particle size of a specific value or less. Examples of such particles include antiblocking agents.

[0047] <Total light transmittance> The total light transmittance of the base film for decoration of this embodiment is preferably 85% or more, and may be, for example, either 87% or more or 89% or more. When the total light transmittance of the base film for decoration is equal to or more than the lower limit, when the base film for decoration is applied to an object (decoration) and the object is observed through the base film for decoration, the object can be visually recognized with an appearance that is the same as or nearly the same as when the object is observed directly. In other words, when such a base film for decoration is applied to an object (decoration), the appearance of the object can be reflected with high precision.

[0048] The upper limit of the total light transmittance of the base film for decoration is not particularly limited. For example, a base film for decoration having a total light transmittance of 95% or less can be produced more easily. In one embodiment, the total light transmittance of the base film for decoration may be, for example, any one of 85 to 95%, 87 to 95%, and 89 to 95%, although these are only examples of the total light transmittance of the base film for decoration.

[0049] It is preferable that the total light transmittance of the decorative base film when measured from at least one side is within the above-mentioned numerical range (e.g., 85% or more), and it is more preferable that the total light transmittance when measured from the one side and the total light transmittance when measured from the other side opposite to the one side are both within the above-mentioned numerical range (e.g., 85% or more).

[0050] The total light transmittance of the base film for decoration can be adjusted by adjusting the types or contents of the components contained in the base film for decoration, or the thickness of the base film for decoration. The total light transmittance of the base film for decoration can be adjusted by adjusting the condition (roughness, etc.) of either or both of the surface of the base film for decoration on which the total light transmittance is measured and the surface opposite thereto. For example, the total light transmittance of the base film for decoration can be easily increased by increasing the smoothness of the surface of the base film for decoration.

[0051] <Haze> The haze of the base film for decoration of the present embodiment is preferably 10% or less, more preferably 7% or less, and may be, for example, any one of 5% or less, 3% or less, and 1.2% or less. When the haze is equal to or less than the upper limit, the same effect as when the total light transmittance of the base film for decoration is equal to or more than the lower limit can be obtained.

[0052] In this specification, unless otherwise specified, "the haze of a base film for decoration" means "the haze of a base film for decoration measured in accordance with JIS K 7136:2000".

[0053] The lower limit of the haze of the base film for decoration is not particularly limited. For example, a base film for decoration having a haze of 0.5% or more can be produced more easily. In one embodiment, the haze of the base film for decoration may be, for example, any one of 0.5 to 10%, 0.5 to 7%, 0.5 to 5%, 0.5 to 3%, and 0.5 to 1.2%, although these are just examples of the haze of the base film for decoration.

[0054] It is preferable that the haze of the decorative base film when measured from at least one side is within the above numerical range (e.g., 10% or less), and it is more preferable that the haze when measured from one side and the haze when measured from the other side opposite the one side are both within the above numerical range (e.g., 6% or less).

[0055] The haze of the base film for decoration can be adjusted by adjusting the types or amounts of the components contained in the base film for decoration, or the thickness of the base film for decoration. The haze of the base film for decoration can be adjusted by adjusting the condition (roughness, etc.) of either or both of the surface of the base film for decoration on which the haze is measured and the surface opposite thereto. For example, the haze of the base film for decoration can be easily reduced by increasing the smoothness of the surface of the base film for decoration.

[0056] The base film for decoration of the present embodiment preferably satisfies both any one of the above-mentioned numerical ranges for the total light transmittance and any one of the above-mentioned numerical ranges for the haze. An example of such a base film for decoration is a base film for decoration having a total light transmittance of 85% or more and a haze of 10% or less, although the combination of the total light transmittance and the haze is not limited thereto.

[0057] <UV transmittance at 360 nm wavelength> The transmittance of the base film for decoration of this embodiment to ultraviolet light with a wavelength of 360 nm (sometimes referred to as "ultraviolet light (wavelength 360 nm)" in this specification) is preferably 1% or less, and may be, for example, any one of 0.5% or less, 0.3% or less, and 0.1% or less. A base film for decoration having a transmittance to ultraviolet light (wavelength 360 nm) equal to or less than the upper limit has high weather resistance.

[0058] The lower limit of the transmittance of the base film for decoration to ultraviolet light (wavelength 360 nm) is not particularly limited. For example, a base film for decoration having a transmittance to ultraviolet light (wavelength 360 nm) of 0.03% or more can be more easily produced. In one embodiment, the transmittance of the base film for decoration to ultraviolet light (wavelength 360 nm) may be, for example, any one of 0.03 to 1%, 0.03 to 0.5%, 0.03 to 0.3%, and 0.03 to 0.1%, although these are only examples of the transmittance of the base film for decoration to ultraviolet light (wavelength 360 nm).

[0059] It is preferable that the transmittance of ultraviolet light (wavelength 360 nm) when measured from at least one side of the decorative base film is within the above numerical range (e.g., 1% or less), and it is more preferable that the transmittance of ultraviolet light (wavelength 360 nm) when measured from one side and the transmittance of ultraviolet light (wavelength 360 nm) when measured from the other side opposite the one side are both within the above numerical range (e.g., 1% or less).

[0060] The transmittance of the base film for decoration to ultraviolet light (wavelength 360 nm) can be adjusted by adjusting the types or amounts of the components contained in the base film for decoration, or the thickness of the base film for decoration. For example, the transmittance of ultraviolet light (wavelength 360 nm) can be easily reduced by making the base film for decoration contain an ultraviolet absorbing agent or by increasing the content of the ultraviolet absorbing agent in the base film for decoration. The transmittance of the base film for decoration to ultraviolet light (wavelength 360 nm) can also be adjusted by adjusting the condition (roughness, etc.) of one or both of the surface of the base film for decoration on which the transmittance of ultraviolet light (wavelength 360 nm) is measured and the surface opposite thereto. For example, by increasing the smoothness of the surface of the base film for decoration, the transmittance of the base film for decoration to ultraviolet light (wavelength 360 nm) can be easily reduced.

[0061] <Resin film adhesion> In the case where a resin film containing a polar resin having a polar group or a cured product of the polar resin is laminated on the base film for decoration of this embodiment, the base film for decoration contains polyester, so that the adhesion between the base film for decoration and the resin film is further increased. The resin film can be, for example, a coating film formed by applying a liquid material containing the polar resin, drying by heating, and curing by heating during the drying by heating as necessary, or curing the dried material by ultraviolet light after the drying by heating. For example, by making the base film for decoration contain glycol-modified polyethylene terephthalate, the resin film adhesion (for example, coating film adhesion) of the base film for decoration can be more easily improved.

[0062] Examples of the polar resin include urethane (meth)acrylate, polyfunctional (meth)acrylate, epoxy acrylate, polyester acrylate, silicon acrylate, polycarbonate acrylate, and polyacryl acrylate. The polar resin and the cured product of the polar resin contained in the resin film may each be of only one type, or of two or more types. If there are two or more types, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0063] In this specification, the term "(meth)acrylate" is a concept that encompasses both "acrylate" and "methacrylate." The same applies to terms similar to "(meth)acrylate."

[0064] <Other configurations of decorative base film> The decorative base film of the present embodiment may be composed of one layer (single layer) or may be composed of two or more layers. When the decorative base film is composed of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention.

[0065] In this specification, not only in the case of decorative base films, "multiple layers may be the same or different" means "all layers may be the same, all layers may be different, or only some layers may be the same", and further, "multiple layers are different" means "at least one of the constituent materials and thicknesses of each layer is different from each other".

[0066] The thickness of the decorative substrate film is not particularly limited and can be set arbitrarily depending on, for example, its application. In general, the thickness of the base film for decoration is preferably 50 to 280 μm, and may be, for example, any one of 50 to 205 μm, 50 to 150 μm, 50 to 100 μm, and 100 to 150 μm. When the base film for decoration is made up of a plurality of layers, the total thickness of these layers is preferably within the above-mentioned numerical range.

[0067] An example of a decorative substrate film consisting of multiple layers is a decorative substrate film consisting of at least three layers (sometimes referred to in this specification as "decorative substrate film (I)"), which is configured with an intermediate layer, a first surface layer provided on one side of the intermediate layer, and a second surface layer provided on the other side of the intermediate layer. The decorative substrate film (I) will be described in detail below.

[0068] ◎Decorative substrate film (I) FIG. 1 is a cross-sectional view that illustrates an example of the base film for decoration (base film for decoration (I)) of this embodiment. The figures used in the following explanation may show key parts enlarged for convenience in order to make the features of the present invention easier to understand, and the dimensional ratios of each component may not necessarily be the same as the actual ones.

[0069] The decorative substrate film 1 shown here is configured to include an intermediate layer 11, a first surface layer 12 provided on one surface 11a of the intermediate layer 11, and a second surface layer 13 provided on the other surface 11b of the intermediate layer 11. In other words, the decorative substrate film 1 is configured by laminating the first surface layer 12, the intermediate layer 11, and the second surface layer 13 in this order in the thickness direction. One side 12a of the first surface 12 (the side opposite the intermediate layer 11; sometimes referred to in this specification as the "first side") is synonymous with one side (first side) 1a of the base film for decoration 1, and one side 13b of the second surface 13 (the side opposite the intermediate layer 11; sometimes referred to in this specification as the "second side") is synonymous with the other side 1b of the base film for decoration 1 (sometimes referred to as the "second side").

[0070] The base film for decoration 1 has A(100° C.) of 5% or less and A(120° C.) of 10% or more. The arithmetic mean height (Sa) of either or both of the first surface 1a and the second surface 1b of the base film for decoration 1 is 0.1 μm or less. The dynamic friction coefficient between the surfaces of the base film for decoration 1 is 0.5 or less. More specifically, the dynamic friction coefficient between the first surfaces 1a of the base film for decoration 1 (dynamic friction coefficient (i) or dynamic friction coefficient (ii)), the dynamic friction coefficient between the second surfaces 1b of the base film for decoration 1 (dynamic friction coefficient (ii) or dynamic friction coefficient (i)), or the dynamic friction coefficient between the first surface 1a and the second surface 1b (dynamic friction coefficient (iii)) is 0.5 or less, and it is preferable that the dynamic friction coefficient between the first surface 1a and the second surface 1b is 0.5 or less.

[0071] It is preferable that either or both of the total light transmittance when measured from the first surface 1a side of the decorative substrate film 1 and the total light transmittance when measured from the second surface 1b side is 85% or more, and it is more preferable that both are 85% or more. It is preferable that either or both of the haze of the decorative substrate film 1 when measured from its first surface 1a side and the haze when measured from its second surface 1b side is 10% or less, and it is more preferable that both are 10% or less. It is preferable that either or both of the transmittance of ultraviolet light (wavelength 360 nm) when measured from the first surface 1a side of the decorative base film 1 and the transmittance of ultraviolet light (wavelength 360 nm) when measured from the second surface 1b side is 1% or less, and it is more preferable that both are 1% or less.

[0072] It is preferable that the decorative base film 1 contains glycol-modified polyethylene terephthalate (PETG), and it is more preferable that the glycol-modified polyethylene terephthalate is polyethylene terephthalate modified with one or more selected from the group consisting of cyclohexanedimethanol, isosorbide, and 2,2,4,4-tetramethyl-1,3-cyclobutanediol.

[0073] [Middle layer] The intermediate layer 11 is a main layer containing the resin of the base film 1 for decoration, and preferably has heat resistance. When the intermediate layer 11 has heat resistance, the base film 1 for decoration also has heat resistance.

[0074] The intermediate layer 11 preferably contains glycol-modified polyethylene terephthalate, and may or may not contain other components in addition to that.

[0075] The glycol-modified polyethylene terephthalate and the other components contained in the decorative base film may each be of only one type or of two or more types. When there are two or more types, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0076] In terms of heat resistance, the intermediate layer 11 preferably contains, as glycol-modified polyethylene terephthalate, polyethylene terephthalate modified with cyclohexanedimethanol and either or both of isosorbide and 2,2,4,4-tetramethyl-1,3-cyclobutanediol.

[0077] Examples of the other components that the intermediate layer 11 may contain include the same components as those described above as being contained in the base film for decoration.

[0078] In the intermediate layer 11, the ratio of the content of glycol-modified polyethylene terephthalate to the total mass of the intermediate layer 11 ([content of glycol-modified polyethylene terephthalate in intermediate layer (parts by mass)] / [total mass of intermediate layer]×100) is preferably 80 to 100% by mass, more preferably 90 to 100% by mass, and may be, for example, any one of 95 to 100% by mass and 97 to 100% by mass. The ratio is usually the same as the ratio of the content (parts by mass) of glycol-modified polyethylene terephthalate to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming an intermediate layer described below. In other words, in the intermediate layer 11, the content ratio of the other components relative to the total mass of the intermediate layer 11 is preferably 0 to 20 mass%, more preferably 0 to 10 mass%, and may be, for example, any of 0 to 5 mass% and 0 to 3 mass%.

[0079] In this specification, "room temperature" means a temperature that is neither particularly cooled nor heated, that is, an ordinary temperature, and examples thereof include temperatures of 15 to 25°C.

[0080] The intermediate layer 11 may be composed of one layer (single layer) or may be composed of two or more layers. When the intermediate layer 11 is composed of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention. The intermediate layer 11 preferably consists of one layer (single layer).

[0081] The thickness of the intermediate layer 11 is preferably 40 to 200 μm, and may be, for example, any one of 40 to 140 μm, 40 to 100 μm, 40 to 70 μm, and 70 to 100 μm. When the intermediate layer 11 is made up of a plurality of layers, the total thickness of these layers is preferably within the above numerical range.

[0082] The ratio of the thickness of the intermediate layer 11 to the thickness of the base film for decoration 1 ([thickness of intermediate layer] / [thickness of base film for decoration]×100) is not particularly limited, but is preferably 50 to 85%, and may be, for example, any one of 50 to 68% and 68 to 85%. When the intermediate layer 11 is made up of a plurality of layers, the ratio of the total thickness of these layers to the thickness of the base film for decoration 1 is preferably within the above-mentioned numerical range.

[0083] In this specification, as described below, the ratio of the thickness of not only the intermediate layer 11 but also the first surface layer 12 and the second surface layer 13 to the thickness of the base film for decoration 1 is described, but the total thickness ratio of all these layers in the base film for decoration 1 does not exceed 100%.

[0084] [1st surface layer] The first surface layer 12 is one of the surfaces (the outermost layer) of the base film for decoration 1, and when the base film for decoration 1 is applied (decorated) to an object, the first surface 12a can be positioned facing either the side of the object or the side opposite the object. The first surface layer 12 is preferably a layer that adjusts the properties of the base film for decoration 1 other than the heat resistance.

[0085] First surface layer 12 preferably contains glycol-modified polyethylene terephthalate, and may or may not contain other components in addition to that, but preferably contains other components.

[0086] The glycol-modified polyethylene terephthalate and the other components contained in the first surface layer 12 may each be of only one type or of two or more types. When there are two or more types, the combination and ratio thereof can be selected arbitrarily depending on the purpose.

[0087] It is preferable that the first surface layer 12 contains polyethylene terephthalate modified with cyclohexanedimethanol as glycol-modified polyethylene terephthalate, in order to provide the decorative substrate film 1 with good formability, weather resistance, and resin film adhesion. The polyethylene terephthalate modified with cyclohexanedimethanol may or may not have, as a constituent unit derived from glycol, either or both of a constituent unit derived from isosorbide and a constituent unit derived from 2,2,4,4-tetramethyl-1,3-cyclobutanediol, but it is preferable that it does not have them.

[0088] Examples of the other components that may be contained in the first surface layer 12 include the same components as those previously described as being contained in the base film for decoration. Among them, preferred other components include an antiblocking agent, an ultraviolet absorbing agent (weather resistance agent), the other polyesters, etc. These other components are particularly preferred when applying (decorating) the base film for decoration 1 to an object and arranging the first surface 12a of the first surface layer 12 facing the side opposite to the object.

[0089] When the first surface layer 12 contains an antiblocking agent, the coefficient of dynamic friction between the surfaces of the base film for decoration 1 can be easily reduced, for example, more easily set to 0.5 or less. The antiblocking agent contained in the first surface layer 12 is the one described above. When the first surface layer 12 contains an ultraviolet absorbing agent, the transmittance of the base film for decoration 1 for ultraviolet light (wavelength 360 nm) can be easily reduced, for example, more easily set to 1% or less. When the first surface layer 12 contains the other polyester (particularly polybutylene terephthalate), the heat resistance of the first surface layer 12 is improved, and accordingly, the heat resistance of the base film 1 for decoration is also improved.

[0090] In this specification, not only in the case of an antiblocking agent, but also unless otherwise specified, the "average particle size" means the particle size at 50% accumulation of particles (D50) when the particle size distribution of particles is measured on a volume basis by a laser diffraction particle size distribution measurement method.

[0091] In the first surface layer 12, the ratio of the content of glycol-modified polyethylene terephthalate to the total mass of the first surface layer 12 ([content of glycol-modified polyethylene terephthalate in the first surface layer (parts by mass)] / [total mass of the first surface layer]×100) may be, for example, any one of 30 to 99.6 mass%, 45 to 99.6 mass%, and 60 to 99.6 mass%, but is preferably any one of 75 to 99.6 mass%, and may be, for example, any one of 75 to 85 mass% and 85 to 99.6 mass%. When the ratio is equal to or greater than the lower limit, the effect obtained by the first surface layer 12 containing the glycol-modified polyethylene terephthalate is enhanced. When the ratio is equal to or less than the upper limit, the effect obtained by the first surface layer 12 containing the other components is enhanced. The ratio is usually the same as the ratio of the content (parts by mass) of glycol-modified polyethylene terephthalate to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the first surface layer described below. In other words, in first surface layer 12, the content ratio of the other components relative to the total mass of first surface layer 12 may be, for example, any one of 0.4 to 70 mass%, 9.4 to 55 mass%, and 0.4 to 40 mass%, but is preferably 0.4 to 25 mass%, and may be, for example, any one of 15 to 25 mass% and 0.4 to 15 mass%. The ratio of glycol-modified polyethylene terephthalate and the ratio of the other components are particularly suitable when the other components include one or more selected from the group consisting of an antiblocking agent, an ultraviolet absorber, and the other polyesters.

[0092] The first surface layer 12 may be made of one layer (single layer) or may be made of two or more layers. When the first surface layer 12 is made of multiple layers, these multiple layers may be the same or different, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention. First surface layer 12 preferably consists of one layer (single layer).

[0093] The thickness of first surface layer 12 is preferably 5 to 50 μm, and may be, for example, any one of 5 to 40 μm, 5 to 30 μm, 5 to 18 μm, and 18 to 30 μm. When first surface layer 12 is made up of multiple layers, the total thickness of these multiple layers preferably falls within the above numerical range.

[0094] The ratio of the thickness of the first surface layer 12 to the thickness of the base film for decoration 1 ([thickness of the first surface layer] / [thickness of the base film for decoration]×100) is not particularly limited, but is preferably 8 to 30%, and may be, for example, any one of 8 to 19% and 19 to 30%. When the first surface layer 12 is made up of multiple layers, the ratio of the total thickness of these multiple layers to the thickness of the base film 1 for decoration preferably falls within the above-mentioned numerical range.

[0095] [Second surface layer] The second surface layer 13 is the other surface layer (outermost layer) of the decorative substrate film 1, and when the decorative substrate film 1 is applied (decorated) to an object, the second surface 13b can be positioned facing either the object side or the side opposite the object side. The second surface layer 13 is preferably a layer that adjusts the properties of the base film for decoration 1 other than the heat resistance.

[0096] The components contained in the second surface layer 13 can be similar to those contained in the first surface layer 12, and the effects obtained by the second surface layer 13 containing these components are similar to those of the first surface layer 12. For example, second surface layer 13 preferably contains glycol-modified polyethylene terephthalate, and may or may not contain other components in addition to that, but preferably contains other components. Second surface layer 13 may be the same as or different from first surface layer 12 in terms of the components and their contents (ie, composition).

[0097] Preferable examples of the other components contained in second surface layer 13 include an antiblocking agent, the other polyesters mentioned above, and the like. When the second surface layer 13 contains an antiblocking agent, the coefficient of dynamic friction between the surfaces of the base film 1 for decoration can be easily reduced, for example, more easily set to 0.5 or less. When second surface layer 13 contains the other polyester (particularly polybutylene terephthalate), the heat resistance of second surface layer 13 is improved, and accordingly, the heat resistance of base film 1 for decoration is also improved.

[0098] In the second surface layer 13, the ratio of the content of glycol-modified polyethylene terephthalate to the total mass of the second surface layer 13 ([content of glycol-modified polyethylene terephthalate in the second surface layer (parts by mass)] / [total mass of the second surface layer]×100) is preferably 75 to 99.6% by mass, and may be, for example, any one of 75 to 95% by mass, 75 to 85% by mass, 85 to 99.6% by mass, 92 to 99.6% by mass, and 85 to 95% by mass. When the ratio is equal to or greater than the lower limit, the effect obtained by the second surface layer 13 containing the glycol-modified polyethylene terephthalate is enhanced. When the ratio is equal to or less than the upper limit, the effect obtained by the second surface layer 13 containing the other components is enhanced. The ratio is usually the same as the ratio of the content (parts by mass) of glycol-modified polyethylene terephthalate to the total content (parts by mass) of components that do not vaporize at room temperature in the composition for forming the second surface layer described below. In other words, in second surface layer 13, the content of the other components relative to the total mass of second surface layer 13 is preferably 0.4 to 25 mass%, and may be, for example, any one of 5 to 25 mass%, 15 to 25 mass%, 0.4 to 15 mass%, 0.4 to 8 mass%, and 5 to 15 mass%. The above ratio of glycol-modified polyethylene terephthalate and the above ratio of the other components are particularly suitable when the other components include either or both of an antiblocking agent and the other polyester.

[0099] The second surface layer 13 may be made of one layer (single layer) or may be made of two or more layers. When the second surface layer 13 is made of multiple layers, these multiple layers may be the same or different, and the combination of these multiple layers is not particularly limited as long as it does not impair the effects of the present invention. Second surface layer 13 preferably consists of one layer (single layer).

[0100] The thickness of second surface layer 13 is preferably 5 to 30 μm, and may be, for example, any one of 5 to 25 μm, 5 to 20 μm, 5 to 12 μm, and 12 to 20 μm. When second surface layer 13 is made up of multiple layers, the total thickness of these multiple layers preferably falls within the above numerical range.

[0101] The ratio of the thickness of the second surface layer 13 to the thickness of the base film for decoration 1 ([thickness of the second surface layer] / [thickness of the base film for decoration]×100) is not particularly limited, but is preferably 7 to 20%, and may be, for example, any one of 7 to 13% and 13 to 20%. When the second surface layer 13 is made up of a plurality of layers, the ratio of the total thickness of these layers to the thickness of the base film 1 for decoration preferably falls within the above-mentioned numerical range.

[0102] [Other layers] The decorative base film 1 may or may not have other layers that do not fall into the category of intermediate layer 11, first surface layer 12, or second surface layer 13, as long as the effects of the present invention are not impaired. When the base film for decoration 1 has the other layers, the type, number and arrangement of the other layers can be selected arbitrarily depending on the purpose. However, in the decorative base film 1, it is preferable that the other layers are arranged between the intermediate layer 11 and the first surface layer 12, or between the intermediate layer 11 and the second surface layer 13, in other words, that the other layers are not arranged on the side of the first surface layer 12 opposite the intermediate layer 11 side, and on the side of the second surface layer 13 opposite the intermediate layer 11 side.

[0103] In the base film for decoration 1, it is preferable that the first surface layer 12 is provided in direct contact with one surface 11a of the intermediate layer 11, and the second surface layer 13 is provided in direct contact with the other surface 11b of the intermediate layer 11. It is easier to make such a base film for decoration 1 excellent in all of formability, heat resistance, gloss, and slipperiness.

[0104] <Method of manufacturing base film for decoration> The decorative substrate film of the present embodiment can be produced by molding a composition (for example, a resin composition) or a resin that is a forming material thereof. A decorative substrate film consisting of multiple resin layers, such as the decorative substrate film (I), can be produced, for example, by a feed block method in which resins or resin compositions that are materials for forming each layer are melt-extruded using several extruders, a co-extrusion T-die method such as a multi-manifold method, or an air-cooled or water-cooled co-extrusion inflation method.

[0105] When the resin composition is used, for example, a mixture of two or more components (dry blend, non-kneaded material) may be directly fed into the extruder as the resin composition, or a pre-kneaded material in which two or more components are kneaded in advance may be fed into the extruder as the resin composition. The pre-kneaded product can be obtained, for example, by melt-kneading two or more components using an apparatus such as a twin-screw extruder or a Banbury mixer.

[0106] A decorative base film consisting of multiple layers can also be produced by first separately preparing two or more films to constitute any two or more of the layers, and then laminating them together using a thermal lamination method or the like without using an adhesive, and then, if necessary, further laminating other layers so as to achieve the desired arrangement.

[0107] The resin composition may be produced by adjusting the types and contents of the components contained therein so that the layer to be formed contains the desired components in the desired amounts. For example, the ratio of the contents of the components that do not vaporize at room temperature in the resin composition is usually the same as the ratio of the contents of the components in the layer formed from this resin composition.

[0108] The resin composition for forming the intermediate layer (intermediate layer 11 in the decorative substrate film 1 shown in FIG. 1) (sometimes referred to herein as "composition for forming intermediate layer"), the resin composition for forming the first surface layer (first surface layer 12 in the decorative substrate film 1 shown in FIG. 1) (sometimes referred to herein as "composition for forming first surface layer"), and the resin composition for forming the second surface layer (second surface layer 13 in the decorative substrate film 1 shown in FIG. 1) (sometimes referred to herein as "composition for forming second surface layer") are each, for example, a resin composition containing glycol-modified polyethylene terephthalate and, if necessary, other components. The glycol-modified polyethylene terephthalate and the other components are the components described above. In this specification, the first surface layer forming composition and the second surface layer forming composition may be collectively referred to as the "surface layer forming composition." EXAMPLES

[0109] The present invention will be described in more detail below with reference to specific examples, although the present invention is not limited to the examples shown below.

[0110] The raw materials used in each of the examples and comparative examples are as follows. PETG (1): Glycol-modified polyethylene terephthalate modified with cyclohexanedimethanol and isosorbide ("T95" manufactured by Skchemical Co., Ltd., glass transition temperature 95°C, heat-resistant PETG) PETG (2): Glycol-modified polyethylene terephthalate modified with cyclohexanedimethanol (Skchemical's "S2008")

[0111] mLLDPE: Metallocene-catalyzed linear low-density polyethylene (Ube Maruzen Polyethylene Co., Ltd. "Yumerit (registered trademark) 1520F") PBT: Polybutylene terephthalate (Chang Chun Petrochemical Co., Ltd. "1100-630S")

[0112] AB(1): Antiblocking agent ("M05" manufactured by Nippon Shokubai Co., Ltd., spherical particles of benzoguanamine-formaldehyde condensate, average particle size 5 μm) AB(2): Antiblocking agent masterbatch ("EX-TNAB2" manufactured by Nippon Pigment Co., Ltd., base resin: polyethylene terephthalate, antiblocking agent: silica particles (average particle diameter 2 μm)) AB(3): Antiblocking agent masterbatch (SUKANO "GdcS589", base resin: glycol-modified polyethylene terephthalate modified with cyclohexane dimethanol, antiblocking agent: silica particles) AB(4): Antiblocking agent ("SC10-32F" manufactured by Nippon Steel Chemical & Material Co., Ltd., spherical silica particles, average particle diameter 12 μm) WA: Weather resistant masterbatch (SUKANO "TA10-18", base resin: glycol modified polyethylene terephthalate modified with cyclohexane dimethanol)

[0113] The commercially available resin films used in the comparative examples are as follows. PMMA film: Polymethylmethacrylate film (Sumika Acrylic Sales, "Technoloy (registered trademark) S001G", thickness 125 μm)

[0114] [Example 1] <<Manufacture of decorative base film>> The PETG (2) (99.5 parts by mass) and the AB (1) (0.5 parts by mass) were mixed at room temperature to prepare a surface layer forming composition (1). The PETG (2) (90 parts by mass) and the AB (2) (10 parts by mass) were mixed at room temperature to prepare a surface layer forming composition (2).

[0115] By co-extruding the surface-forming composition (1), the PETG (1), and the surface-forming composition (2) in this order, a molten resin laminate was produced in the die, and then this molten resin laminate was cooled and solidified to obtain a decorative base film (thickness 100 μm) having the configuration shown in FIG. 1. This decorative base film was composed of a first surface layer (thickness 10 μm), an intermediate layer (thickness 80 μm), and a second surface layer (thickness 10 μm) laminated in this order in the thickness direction thereof. The first surface layer was formed from the surface-forming composition (1), and the second surface layer was formed from the surface-forming composition (2). This decorative base film was long and was wound into a roll with its first surface layer facing outward.

[0116] <<Evaluation of Decorative Base Film>> <Measurement of A(100°C) and A(120°C)> A test piece having a size of 4 mm × 50 mm was cut out from the decorative base film obtained above. In the test piece, its longitudinal direction was made to coincide with the MD direction. Using a thermomechanical analyzer (manufactured by Hitachi High-Technologies Corporation, "TMA7100"), the test piece was heated from 25°C to 150°C under an air atmosphere under the conditions of a chuck interval of about 10 mm, a load of 49 mN, and a heating rate of 5°C / min. Then, the displacement amount (A(100°C)) in the longitudinal direction (MD direction) of the test piece at 100°C and the displacement amount (A(120°C)) in the longitudinal direction (MD direction) of the test piece at 120°C were measured. The results are shown in Table 1.

[0117] <Measurement of Arithmetic Mean Height (Sa) of Surface> Using an interference microscope (manufactured by Rhika Systems Co., Ltd., "VertScan R3300H"), the arithmetic mean height (Sa) of the exposed surface of the first surface layer (the first surface, the first surface of the decorative base film, the same hereinafter) and the exposed surface of the second surface layer (the second surface, the second surface of the decorative base film, the same hereinafter) of the decorative base film obtained above was measured in accordance with ISO 25178. The results are shown in Table 1.

[0118] <Measurement of Coefficient of Kinetic Friction between Surfaces> The dynamic friction coefficient of the test pieces obtained above was measured in accordance with JIS K 7125:1999 ((ISO 8295:1995)), except that the test speed was changed from 100 mm / min to 150 mm / min. That is, two test pieces were cut out from the decorative base film obtained above. The exposed surface of the first surface layer of one test piece was superimposed on the exposed surface of the second surface layer of the other test piece to form a test laminate. In this test laminate, the longitudinal directions of both test pieces were aligned with the MD direction of these test pieces. Using a tensile tester (A&D Corporation's "Tensilon RTH-1225"), an area of ​​40 cm2 of the exposed surface of the first surface layer of the test laminate was subjected to tensile testing. 2 A weight was placed on the area and a load of 200 g was applied, and the test piece in contact with the weight was pulled in the longitudinal direction (MD direction) of the test piece with the weight still placed (load applied) at a test speed of 150 mm / min, and the dynamic friction coefficient (dynamic friction coefficient (iii)) was calculated from the load at this time. The results are shown in Table 1.

[0119] <Measurement of total light transmittance and haze> Using a haze meter ("Haze Meter NDH2000" manufactured by Nippon Denshoku Industries Co., Ltd.), the total light transmittance of the base film for decoration obtained above was measured by applying light to the first surface layer side thereof in accordance with JIS K 7361-1, and the haze of the base film for decoration was measured in accordance with JIS K7136. The results are shown in Table 1.

[0120] <Measurement of UV transmittance at a wavelength of 360 nm> Using a UV-Vis spectrophotometer (JASCO Corporation, "V-650"), the base film for decoration obtained above was irradiated with light from its first surface layer side, and the total light transmittance of the base film for decoration in the wavelength range of 200 to 780 nm was measured at wavelengths of 1 nm. The UV transmittance at a wavelength of 360 nm is shown in Table 1.

[0121] <Evaluation of moldability> A toy-sized model car (material: aluminum and ABS resin, maximum length 6.5 cm, maximum width 3 cm, maximum height 2 cm) was used as the adherend, and the decorative base film obtained above was placed on it. At this time, the second surface side of the decorative base film was faced to the adherend. In this state, using a vacuum seal packaging machine (Hi-Pac's "Hyman HI-750II"), an attempt was made to vacuum seal the decorative base film to almost the entire surface of the adherend (model car) except for the bottom surface at 120°C for 30 seconds. Then, the degree of conformity and adhesion of the decorative base film to the adherend at this time was visually observed, and the formability of the decorative base film was evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: The base film for decoration adheres to the substrate without wrinkles and conforms well from the roof to the wheels of the substrate. The formability of the base film for decoration is high. B: Wrinkles are generated in the base film for decoration, or at least a portion of the base film for decoration is not in close contact with the substrate, and the base film for decoration does not conform to at least one of the regions from the roof to the wheel of the substrate, and the formability of the base film for decoration is low.

[0122] <Evaluation of gloss> At the same time as the evaluation of the formability, the appearance of the base film for decoration in the region that was vacuum-adhered to the adherend was visually observed. The gloss of the base film for decoration was then evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: The base film for decoration has a glossy appearance and is highly glossy. B: The base film for decoration has no gloss, has a poor appearance, and has low gloss.

[0123] <Evaluation of heat resistance> A hard coat forming coating solution containing urethane acrylate ("Z-879" manufactured by Aica Kogyo Co., Ltd.) was applied to the exposed surface of the first surface layer of the base film for decoration obtained above by direct gravure coating, and dried by heating at 100°C for 1 minute. Then, the shrinkage rate of the width of the base film for decoration after drying (= ([Width of base film for decoration before drying] - [Width of base film for decoration after drying]) / [Width of base film for decoration before drying] x 100) was calculated, and the heat resistance of the base film for decoration was evaluated from the result according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: The width shrinkage rate of the base film for decoration is less than 1%, and the base film for decoration has high heat resistance. B: The width shrinkage rate of the base film for decoration is 1% or more, and the heat resistance of the base film for decoration is low.

[0124] <Evaluation of slipperiness> The base film for decoration obtained above was unwound from the roll and the slipperiness of the base film for decoration was evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: The base film for decoration has good slipperiness and is easy to handle. The base film for decoration has high slipperiness. B: The base film for decoration has poor slipperiness and is difficult to handle, and the base film for decoration has low slipperiness.

[0125] <Weather resistance evaluation> The decorative base film obtained above was placed under the conditions of water spray, black standard temperature 65°C, tank temperature 38°C, and relative humidity (RH) 50%, and a xenon lamp was used to illuminate the decorative base film with an irradiance of 60 W / m 2 The film was irradiated with light for 3000 hours under the above conditions. The appearance of the decorative base film after irradiation was visually observed, and the weather resistance of the decorative base film was evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: The base film for decoration does not yellow and has high weather resistance. B: The base film for decoration has yellowed and has poor weather resistance.

[0126] <Evaluation of coating adhesion> A hard coat forming coating solution containing urethane acrylate ("Z-607-5" manufactured by Aica Kogyo Co., Ltd.) was applied to the exposed surface of the first surface layer of the decorative substrate film obtained above by a direct gravure coating method, and the coating was dried by heating at 100°C for 1 minute. Next, the dried product was subjected to 200 mJ / cm 2 The laminate was irradiated with ultraviolet light at a light intensity of 1000 nm to form a coating film (thickness 3 μm) which is a hard coat layer. The laminate was then molded by vacuum molding at 120° C. for 30 seconds using a vacuum seal packaging machine (Hi-Pac's "Hyman HI-750II"). The resulting molded product was visually inspected for peeling of the base film for decoration from the coating film, and the coating film adhesion (resin film adhesion) of the base film for decoration was evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: The base film for decoration does not peel off from the coating, and the coating adhesion of the base film for decoration is high. B: The base film for decoration peeled off from the coating, and the coating adhesion of the base film for decoration was poor.

[0127] <<Production and evaluation of decorative base film>> [Example 2] The PETG (2) (79 parts by mass), the PBT (20 parts by mass), and the AB (3) (1 part by mass) were mixed at room temperature to prepare a surface layer forming composition (3).

[0128] The surface layer forming composition (3), the PETG (1), and the surface layer forming composition (3) were co-extruded in this order to prepare a molten resin laminate in a die, and then the molten resin laminate was cooled and solidified to obtain a decorative base film (thickness 100 μm) having the configuration shown in FIG. 1. This decorative base film was configured by laminating a first surface layer (thickness 10 μm), an intermediate layer (thickness 80 μm), and a second surface layer (thickness 10 μm) in this order in the thickness direction. This decorative base film was long and was wound into a roll with the first surface layer facing outward. In the decorative base film of this embodiment, the first surface layer and the second surface layer are the same, but as described above, the surface layer on the outer side in the radial direction of the roll was conveniently designated as the first surface layer.

[0129] The decorative base film obtained above was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0130] [Example 3] The PETG (2) (31.5 parts by mass), the WA (67 parts by mass), and the AB (3) (1.5 parts by mass) were mixed at room temperature to prepare a surface layer forming composition (4). The PETG (2) (98.5 parts by mass) and the AB (3) (1.5 parts by mass) were mixed at room temperature to prepare a surface layer forming composition (5).

[0131] The surface layer forming composition (4), the PETG (1), and the surface layer forming composition (5) were co-extruded in this order to prepare a molten resin laminate in a die, and then the molten resin laminate was cooled and solidified to obtain a decorative base film (thickness 100 μm) having the configuration shown in FIG. 1. This decorative base film was configured by laminating a first surface layer (thickness 25 μm), an intermediate layer (thickness 60 μm), and a second surface layer (thickness 15 μm) in this order in the thickness direction. The first surface layer was formed from the surface layer forming composition (4), and the second surface layer was formed from the surface layer forming composition (5). This decorative base film was long, and was wound into a roll with the first surface layer facing outward.

[0132] The decorative base film obtained above was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0133] <<Evaluation of base film>> [Comparative Example 1] The PMMA film was used as the substrate film, and the PMMA film was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0134] <<Production and evaluation of base film>> [Comparative Example 2] After the PETG (2) was extruded, it was cooled and solidified to obtain a single-layer substrate film (thickness: 100 μm). This substrate film was long and wound into a roll. This substrate film was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0135] [Comparative Example 3] After the mLLDPE was extruded, it was cooled and solidified to obtain a single-layer substrate film (thickness: 150 μm). This substrate film was long and wound into a roll. This substrate film was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0136] [Comparative Example 4] The PETG (2) (97 parts by mass) and the AB (4) (3 parts by mass) were mixed at room temperature to prepare a surface layer forming composition (R1). The PETG (2) (99.5 parts by mass) and the AB (4) (0.5 parts by mass) were mixed at room temperature to prepare a surface layer forming composition (R2).

[0137] The surface layer forming composition (R1), the PETG (2), and the surface layer forming composition (R2) were co-extruded in this order to produce a molten resin laminate in a die, and then the molten resin laminate was cooled and solidified to obtain a base film (thickness 100 μm). This base film was constructed by laminating a first surface layer (thickness 10 μm), an intermediate layer (thickness 80 μm), and a second surface layer (thickness 10 μm) in this order in the thickness direction. The first surface layer was formed from the surface layer forming composition (R1), and the second surface layer was formed from the surface layer forming composition (R2). This base film was long, and was wound into a roll with the first surface layer facing outward.

[0138] The substrate film obtained above was evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0139] [Table 1]

[0140] [Table 2]

[0141] As is clear from Table 1, the formability of the base film for decoration was high in Examples 1 to 3. The A(120° C.) of these base films for decoration was 20.6% or more (20.6 to 37%). Furthermore, the base film for decoration had high heat resistance in Examples 1 to 3. The A(100° C.) of these base films for decoration was 4.1% or less (2.7 to 4.1%). Furthermore, the base films for decoration had high gloss in Examples 1 to 3. The first surface layer of each of these base films for decoration had an Sa of 0.063 μm or less (0.046 to 0.063 μm), and the second surface layer had an Sa of 0.066 μm or less (0.054 to 0.066 μm). Furthermore, the base film for decoration had high slipperiness in Examples 1 to 3. These base films for decoration contained an AB agent, and the dynamic friction coefficient of these base films for decoration was 0.43 or less (0.38 to 0.43).

[0142] The decorative base film of Example 3 had higher weather resistance than the decorative base films of Examples 1 and 2. The transmittance of ultraviolet light (wavelength 360 nm) through the decorative base film was 87.2% or more (87.2 to 88.4%) in Examples 1 and 2, but was 0.05% in Example 3. The decorative base films of Examples 1 and 2 did not contain a weather resistance agent, but the decorative base film of Example 3 contained a weather resistance agent in WA. In Examples 1 to 3, the total light transmittance of the base film for decoration was 89% or more (89 to 90%), and the haze was 5.6% or less (0.9 to 5.6%). In other words, the base film for decoration of Examples 1 to 3 was suitable for accurately reflecting the appearance of the object to which it was applied (decorated). The base film for decoration had high coating adhesion in Examples 1 to 3. The layer of these base films for decoration that came into contact with the coating, that is, the first surface layer, contained PETG (2) which is a polyester.

[0143] In contrast, as is clear from Table 2, the formability of the PMMA film was poor in Comparative Example 1. The A(120°C) of the PMMA film in Comparative Example 1 was small, at 3.3%.

[0144] The heat resistance of the base films was low in Comparative Examples 2 and 4. The A(100°C) of these base films was large, being 11.2% or more (11.2 to 11.4%), and the intermediate layer of these base films contained PETG (2). Furthermore, the slipperiness of the base film was also low in Comparative Example 2. The first and second surface layers of the base film of Comparative Example 2 did not contain an AB agent, and the dynamic friction coefficient of the base film was 6.2, which was large. Furthermore, the gloss of the base film was low in Comparative Example 4. The first surface layer of the base film in Comparative Example 4 had a Sa of 0.49 μm, and the second surface layer had a Sa of 0.38 μm, both of which were large. Both the first surface layer and the second surface layer of the base film in Comparative Example 4 contained an AB agent with a large average particle size.

[0145] The heat resistance of the base film was low in Comparative Example 3. The single-layer base film of Comparative Example 3 contained mLLDPE, and the A(100°C) of the base film was large at 5.3%. Furthermore, the slipperiness of the base film was also low in Comparative Example 3. The single-layer base film of Comparative Example 3 did not contain an AB agent, and the dynamic friction coefficient of the base film was 0.75, which was large.

[0146] The weather resistance of the base films of Comparative Examples 2 to 4 was also low. The transmittance of these base films to ultraviolet light (wavelength 360 nm) was high, at 86.5% or more (86.5 to 89.2%). These base films contained only PETG (2) or mLLDPE as the main resin component, and did not contain any weather resistance agent. The coating adhesion of the single-layer substrate film was also poor in Comparative Example 3. This substrate film contained mLLDPE, which is polyethylene, rather than polyester. [Industrial Applicability]

[0147] The present invention can be used to construct a decorative film. [Explanation of symbols]

[0148] 1...Base material film for decoration; 1a...One surface (first surface) of the base material film for decoration; 1b...Another surface (second surface) of the base material film for decoration 11. Middle class 12: first surface layer, 12a: one surface (first surface) of the first surface layer 13... second surface layer, 13b... one surface (second surface) of the second surface layer

Claims

1. A decorative substrate film, When the decorative base film is subjected to a thermomechanical analysis, the amount of displacement at 100° C. is 5% or less, and the amount of displacement at 120° C. is 10% or more, The arithmetic mean height (Sa) of one or both sides of the base film for decoration is 0.1 μm or less; The base film for decoration has a dynamic friction coefficient between its two surfaces of 0.5 or less.

2. The total light transmittance of the decorative substrate film is 85% or more, 2. The substrate film for decoration according to claim 1, wherein the substrate film for decoration has a haze of 10% or less as measured in accordance with JIS K 7136:2000.

3. The decorative base film contains glycol-modified polyethylene terephthalate, The glycol-modified polyethylene terephthalate is a polyethylene terephthalate modified with one or more selected from the group consisting of cyclohexanedimethanol, isosorbide, and 2,2,4,4-tetramethyl-1,3-cyclobutanediol. The decorative substrate film according to claim 1 or 2.

4. 3. The base film for decoration according to claim 1, wherein the transmittance of the base film for decoration to ultraviolet light having a wavelength of 360 nm is 1% or less.

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