KR101786152B1 - Decoration sheet - Google Patents

Abstract

A surface layer, a back layer, and at least one intermediate layer between the surface layer and the back layer, wherein the surface layer and the back layer each independently comprise a first composite resin composition comprising a glycol-modified polyethylene terephthalate resin and an ester- Wherein the intermediate layer is formed of a second composite resin composition comprising a polyethylene terephthalate resin and an ester series resin and the glass transition temperature of the ester series resin is lower than the glass transition temperature of the glycol modified polyethylene terephthalate resin, Wherein the ester-based resin has a glass transition temperature lower than the glass transition temperature of the polyethylene terephthalate resin, the content of the ester-based resin in the first composite resin composition is 0 to 15% by weight or less, Wherein the content of the ester-based resin is 4 to 20 % ≪ / RTI >

Description

Deco Sheet {DECORATION SHEET}

Friendly decor sheet having excellent surface characteristics.

Coatings, decorative sheets or decorative sheets are mainly used for decorating purposes in furniture, sinks, and doors.

In the case of the coating material, there is a UV curing type high gloss coating paint, but it is possible to realize only a single color, and there is a problem of occurrence of yellowing of the applied paint and decrease of gloss according to time.

In the case of decorative sheets, PVC sheets based on vinyl chloride resin (PVC) have conventionally been used. In the case of PVC sheets, they are widely used in various products due to their low cost and excellent processability, heat change and excellent elongation.

However, in the case of a PVC sheet, a large amount of dioxin is generated when incinerated. Such dioxins are representative environmental hormones, and once produced, they are stable and not degraded. In this case, if it is absorbed by the human body, it will not be released well and accumulate in the body. As a result, it causes various cancers, severe reproductive system disorders and developmental disorders. In addition, damage to the regulatory function of the hormone can occur.

Due to the human hazards of the PVC sheet as described above, various PVC products including PVC sheets are being regulated. Along with these global trends, regulations are being strengthened in Korea.

In order to solve these problems, development is being carried out through environmentally friendly materials, and as a result, a polyester-based resin-based sheet is proposed.

PETG sheets, which are typically used in polyester resins, have a disadvantage in that they have excellent surface quality and are environmentally friendly, but have a relatively high molding temperature and a high raw material cost. To overcome this problem, it has been devised to add PBT. However, if PBT is added in an excess amount, the molding temperature can be lowered, but the surface quality is lowered, and if the PBT is added in a small amount, the molding temperature can not be lowered.

In addition, PET sheet as a polyester-based resin can be produced more economically than PETG, and is eco-friendly, but has a relatively high molding temperature as well as PETG and has a limitation in hard coating. In the decorative sheet, the hard coating has the effect of improving the chemical resistance and the scratch resistance, and is applied to most decorative sheets.

The decorative sheet can be applied to various methods such as an overlay method, a membrane method, and a lapping method depending on the adhered surface. In particular, in the case of the membrane method, the curvature is deep, the shape is various, Accordingly, there is a problem about the moldability of the decorative sheet.

An embodiment of the present invention is an environmentally friendly one that is excellent in printing and coating properties, excellent in scratch resistance and chemical resistance, has a wide molding temperature range, a low molding temperature, and is free from whitening at the bent portion The present invention provides a decorative sheet which is excellent in properties of a surface that can be formed and can be economically manufactured.

In one embodiment of the present invention, the surface layer, the back layer and at least one intermediate layer between the surface layer and the back layer are included, and the surface layer and the back layer are each independently formed of a glycol-modified polyethylene terephthalate resin and an ester- Wherein the intermediate layer is formed of a second composite resin composition comprising a polyethylene terephthalate resin and an ester resin, and the glass transition temperature of the ester resin is less than the glass transition temperature of the glycol-modified polyethylene terephthalate Is lower than the glass transition temperature of the resin, the glass transition temperature of the ester-based resin is lower than the glass transition temperature of the polyethylene terephthalate resin, and the content of the ester-based resin in the first composite resin composition is 0 to 15% , And the ester of the second composite resin composition The content of the resin provides the decor sheet from 4 to 20% by weight.

In one embodiment, the content of the ester-based resin in the second composite resin composition of the intermediate layer is higher in the first composite resin composition of each of the surface layer and the backside layer.

In another embodiment, the content of the ester-based resin in the first composite resin composition of the backside layer is higher than that of the ester-based resin in the first composite resin composition of the surface layer.

The surface layer and the backside layer may contain about 0 to about 15 wt% of the ester resin in the first composite resin composition.

The intermediate layer may contain about 5 to about 20 wt% of the ester resin in the second composite resin composition.

The ester-based resin may include at least one selected from the group consisting of polybutylene terephthalate, polytrimethylene terephthalate, and combinations thereof.

The first composite resin composition and the second composite resin composition may each have a glass transition temperature (Tg) of 68 3C.

The at least one layer of the sheet may further comprise a pigment.

The content of the pigment may be about 0.1 to about 30 wt% of the first composite resin composition or the second composite resin composition.

The thickness of the intermediate layer may be about 1 to about 20 times the thickness of the surface layer.

The thickness ratio of the surface layer, the intermediate layer, and the backside layer may be about 0.5: 1: 8 to 9: 0.5 to 1.

The total thickness may be from about 100 [mu] m to about 1000 [mu] m.

The decor sheet may have a moldable temperature range of about 60 to about 80 캜.

And a hard coating layer may be further formed on the surface layer.

The hard coating layer may include at least one selected from the group consisting of methyl methacrylate, hydroxyl ethyl methacrylate, methacrylate, ethyl acrylate, and combinations thereof.

The decorative sheet is eco-friendly, has excellent printability, is excellent in scratch resistance and chemical resistance, has a wide molding temperature range, has a low molding temperature, can be molded without occurrence of whitening at the bent portion, Excellent surface characteristics.

1 is a sectional view of a decor sheet according to an embodiment of the present invention.
2 is a cross-sectional view of a decor sheet according to an embodiment of the present invention.
3 is a graph showing the storage elastic modulus of the decor sheet according to Example 1 according to the temperature.
4 is a graph showing the storage modulus of the decor sheet of Comparative Example 1 according to the temperature.
5 is a graph showing the storage modulus of the decor sheet of Comparative Example 3 according to the temperature.
6 is a graph showing the storage elastic modulus of the decor sheet of Comparative Example 4 according to the temperature.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated.

Hereinafter, the formation of any structure in the "upper (or lower)" or the "upper (or lower)" of the substrate means that any structure is formed in contact with the upper surface (or lower surface) of the substrate However, the present invention is not limited to not including other configurations between the substrate and any structure formed on (or under) the substrate.

In one embodiment of the present invention, at least one intermediate layer between a surface layer and a back layer and a surface layer, a back layer and an intermediate layer between the surface layer and the back layer, wherein the surface layer and the back layer are each independently formed of a glycol-modified polyethylene terephthalate (PETG) Wherein the intermediate layer is formed of a second composite resin composition comprising a polyethylene terephthalate (PET) resin and an ester-based resin, the glass transition temperature of the ester-based resin is lower than the glass transition temperature of the glycol Is lower than the glass transition temperature of the modified polyethylene terephthalate (PETG) resin, the glass transition temperature of the ester-based resin is lower than the glass transition temperature of the polyethylene terephthalate (PET) resin, Of the second composite resin composition is from about 0 to about 15 wt% Wherein the content of the polyester resin is about 4 to about 20 wt%.

The ester-based resin is different from polyethylene terephthalate resin or glycol-modified polyethylene terephthalate resin, and each of the ester resins used in the surface layer and the backside layer may be the same or different.

The decor sheet does not cause an environmental hormone problem, so various decorations can be realized by using a resin such as PETG which is eco-friendly and superior in printing property compared with a PVC sheet.

Further, the eco-friendly deco sheet according to the present invention can be formed in a wide molding temperature range, a low molding temperature, and even in the case where the adhered surface is strongly curved, without forming a whitening phenomenon at a bent portion, A wrapping method, a high glossy method and the like, and thermal deformation of the surface can be minimized even after molding. In particular, it is possible to manufacture a sheet excellent in bending formability while maintaining the mirror surface of the surface in the membrane molding.

1 schematically shows a cross section of a decor sheet 100 according to an embodiment of the present invention.

1, the decor sheet 100 includes a surface layer 110 and a back layer 120, and includes an intermediate layer 130 positioned between the surface layer 110 and the back layer 120. In FIG. 1, the intermediate layer 130 is formed of one layer, but the decor sheet 100 may include a plurality of intermediate layers.

FIG. 2 shows a structure in which a hard coating layer 150 is further formed on the surface layer 110 of the decor sheet 200.

As described above, the decor sheet 200 may further include a hard coating layer 150 on the surface layer 110.

The hard coating layer 150 may be made of an acrylic resin material containing at least one of methyl methacrylate, hydroxyl ethyl methacrylate, methacrylate, ethyl acrylate and the like, or a combination thereof.

As described above, the first composite resin composition that can form the surface layer 110 and the back layer 120 includes a glycol-modified polyethylene terephthalate Glycol (hereinafter, also referred to as PETG) resin and an ester-based resin , The second composite resin composition that can form the intermediate layer 130 includes a polyethylene terephthalate (hereinafter, also referred to as PET) resin and an ester-based resin.

The glass transition temperature (Tg) of the ester-based resin in the PETG resin, the PET resin, and the ester-based resin used for the decor sheet (100) is not more than the glass transition temperature (Tg) of the glycol-modified polyethylene terephthalate resin, And the glass transition temperature (Tg) of the ester-based resin is lower than the glass transition temperature (Tg) of the polyethylene terephthalate resin.

Since the PETG resin is an amorphous polymer, whitening does not occur at a bent portion even when molding is performed using a membrane method. As such PETG resin, commercially available SKYGREEN (manufactured by SK Chemical), Spectar (manufactured by Eastman), or Eastar (manufactured by Eastman) can be used.

However, the PETG resin itself has a relatively high glass transition temperature (Tg) of about 80 DEG C, and the sheet based thereon has a problem of high molding temperature.

The ester-based resin serves to lower the glass transition temperature (Tg) and the molding temperature of the PETG resin. For this purpose, the ester-based resin may have a relatively low glass transition temperature as compared with the PETG resin. That is, when the glass transition temperature of the PETG resin is Tg_A, the glass transition temperature of the PET resin is Tg_B, and the glass transition temperature of the ester resin is Tg_C, the ester resins to be used in the present invention are Tg_C <Tg_A and Tg_C &Lt; Tg_B.

Specific examples of such an ester-based resin may include polybutylene terephthalate (PBT) resin, polytrimethylene terephthalate (PTT), or a combination thereof. As the PBT resin, for example, those obtained by liquid phase polymerization or solid phase polymerization can be used.

The content of the ester resin in the second composite resin composition of the intermediate layer 130 is higher than that of the ester resin in the first composite resin composition of each of the surface layer 110 and the back layer 120. Since the intermediate layer 130 contains a high content of the ester-based resin, the decor sheet 100 can soften the sheet, thereby improving the bending formability of the adherend surface having bending, and at the same time, In the backside layer 120, an ester-based resin is included in a low amount to enable the mirror surface to be realized.

Since the formability of the entire decor sheet 100 is determined by the intermediate layer having a high content of the ester-based resin in the sheet, the ester-based resin content of the intermediate layer is preferably relatively high in order to ensure moldability at low temperatures.

In addition, after the molding, the ester resin content of the surface layer 110, which determines the surface roughness, can be controlled to be relatively small to maintain the mirror surface of the sheet surface after molding.

In one embodiment, the content of the ester-based resin in the first composite resin composition of the backing layer 120 may be higher than that of the ester-based resin in the first composite resin composition of the surface layer 110. This is because, in the case of the backside layer, adhesion with the adherend and moldability should be excellent.

The surface layer 110 is exposed to the surface, and the back layer 120 is a surface to be adhered to the adherend.

Specifically, the surface layer 110 and the backside layer 120 may include about 0 to about 15% by weight of the ester resin in the first composite resin composition. Specifically, the surface layer 110 may contain the ester resin in the first composite resin composition in an amount of more than 0 to 7% by weight.

As described above, the content of the ester-based resin in the second composite resin composition may be in the range of about 0 to about 20% by weight, specifically about 5 to about 15% by weight.

When the ester-based resin is contained in the first composite resin composition and the second composite resin composition at less than the above range, the degree of lowering the glass transition temperature (Tg) and the molding temperature of the composite resin is insignificant. On the contrary, It is possible to cause defects that increase the roughness of the sheet surface after thermoforming.

In addition, the first composite resin composition or the second composite resin composition may contain an ester-based resin in the above-mentioned content so that the first composite resin composition has a glass transition temperature (Tg) of about 68 ± 3 ° C . This means that the PETG resin has a glass transition temperature of about 80 ° C, and thus the PETG resin and other resin are blended to lower the glass transition temperature by about 12 ° C.

As described above, in one embodiment of the present invention, it is possible to provide the decor sheet 100 having a processing temperature and moldability similar to PVC without releasing environmental hormones such as PVC.

The decorative sheet 100 including the layer formed of the first composite resin composition and the second composite resin composition has a glass transition temperature within the above range and thus has a storage elastic modulus determined thereby, And may range from about 60 to about 80 &lt; 0 &gt; C.

The PET resin is a crystalline polymer and is included in the second composite resin composition forming the intermediate layer 130.

The decorative sheet 100 can be formed without any whitening at the bent portions even when the surface of the decorative sheet 100 is severely curved. The decorative sheet 100 can be formed by an overlay method, a membrane method, a wrapping method, high glossy) construction method.

The PET resin is less expensive than the PETG resin, and the decor sheet 100 can be economically manufactured by including the PET resin in the intermediate layer 130.

The decorative sheet 100 is made of three layers or more while using PET resin to be included in the intermediate layer 130 so as to be economical and has a structure in which the PET resin is not included in the surface layer 110 and the back layer 120 Therefore, it is possible to satisfy not only economical efficiency but also flexural moldability, surface characteristics and coating stability at the same time.

The surface layer 110 and the back layer 120 are made of PETG resin which is eco-friendly and excellent in printability instead of PET resin. In addition to the above characteristics, (100).

As described above, the decorative sheet 100 is advantageous in that it can be molded even when the bending of the adhered surface is severe due to its excellent formability, excellent scratch resistance, economical production, ) Resin can be used, so that an environmentally friendly effect can be obtained without generating an environmental hormone problem.

The first composite resin composition and the second composite resin composition may further comprise about 0.1 to about 30% by weight of the pigment in the total of the first composite resin composition and the second composite resin composition, respectively. When the pigment is added to the first or second composite resin composition at less than the above range, hiding power or tinting power may be poor. When the pigment is added in excess of the above range, the viscosity of the composite resin is lowered Which may cause processing problems.

The pigment may be contained in only one layer, or may be included in each layer. However, when the pigment is applied to both the surface layer 110, the back layer 120 and the intermediate layer 130, the cost may be increased. When the pigment is applied only to the surface layer 110 or the back layer 120 It is most preferable that the pigment is applied to the intermediate layer 130 as the hiding power may be lowered.

The pigment may be a white pigment, a black pigment, a yellow pigment, a blue pigment, a red pigment, a green pigment, or the like, or a mixture of two or more thereof.

Particularly in the case of white pigments, inorganic particles such as titanium oxide, calcium carbonate, barium sulfate, and magnesium carbonate can be used, and carbon black can be used as the black pigment. In addition, yellow pigments, blue pigments, red pigments, green pigments, and the like, which can be readily obtained commercially, can be used without limitation.

The multi-layered decor sheet 100 can be produced through co-extrusion using, for example, a T-die. The thickness of each layer can be determined according to the pneumatic discharge volume. In the case of the decor sheet 100 of the three-layer structure, a three-layer structure can be manufactured by providing a feed block before the T-die for co-extrusion and using a composite resin from two extruders. When producing a three-layered sheet, the interlayer thickness ratio can be determined according to the extrusion discharge amount.

In addition, the sheet produced through extrusion or co-extrusion may have a thickness of from about 100 [mu] m to about 1000 [mu] m depending on extrusion equipment, process conditions, and the like.

The surface layer 110 or the back layer 120 may be formed to have the same thickness and the intermediate layer 130 may be about 1 to about 20 times the thickness of the surface layer 110 or the back layer 120.

The thickness ratio of the surface layer, the intermediate layer, and the backside layer may be about 0.5: 1: 8 to 9: 0.5 to 1.

The deco sheet 100 can be advantageously applied to a deco sheet used in a room such as a furniture or a sink due to the advantages described above.

Hereinafter, examples and comparative examples of the present invention will be described. The following embodiments are only examples of the present invention, and the present invention is not limited to the following embodiments.

( Example )

Example  One

A three-layered decor sheet having an A / B / A structure was extruded. For the A layer consisting of the surface layer and the backside layer, 70 g of PBT resin was added to 930 g of PETG resin, and the mixture was used after extrusion compounding. In the intermediate layer, 850 g of PET resin was added with 150 g of PBT resin and extrusion compound was used. And extruded at 0.3 mm. The thickness ratio of each layer was adjusted to 1: 8: 1. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

The PBT resin used had a low glass transition temperature for each of PETG resin and PET resin.

Example  2

A three-layered decor sheet having an A / B / A structure was extruded. For the layer A consisting of the surface layer and the backside layer, 40 g of PBT resin was added to 960 g of PETG resin, and the mixture was used after extrusion compounding. In the middle layer, 930 g of PET resin was added with 70 g of PBT resin, And extruded at 0.3 mm. The thickness ratio of each layer was adjusted to 1: 8: 1. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

The PBT resin used had a low glass transition temperature for each of PETG resin and PET resin.

Example  3

A three-layered decor sheet having an A / B / A structure was extruded. 1000 g of PETG resin was used for the A layer constituting the surface layer and the backside layer, and 150 g of PBT resin was added to 850 g of the PET resin. The intermediate layer was extrusion compounded and then extruded at 0.3 mm using the above two samples. The thickness ratio of each layer was adjusted to 1: 8: 1. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

The PBT resin used had a low glass transition temperature for each of PETG resin and PET resin.

Example  4

A three-layered decor sheet having an A / B / A structure was extruded. For the A layer constituting the surface layer and the backside layer, 40 g of PBT resin was added to 960 g of PETG resin, and the mixture was used after extrusion compounding. In the intermediate layer, 200 g of PBT resin was added to 800 g of PET resin, And extruded at 0.3 mm. The thickness ratio of each layer was adjusted to 1: 8: 1. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

The PBT resin used had a low glass transition temperature for each of PETG resin and PET resin.

Example  5

A three-layered decor sheet having an A / B / C structure was extruded. For the A layer constituting the surface layer and the backside layer, 40 g of PBT resin was added to 960 g of the PETG resin, and the mixture was used after extrusion compounding. In the middle layer, 850 g of PET resin was added with 150 g of PBT resin, 70 g of PBT resin was added to 930 g, extrusion compounded, and then extruded at 0.3 mm using the above three samples. The thickness ratio of each layer was adjusted to 1: 8: 1. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

The PBT resin used had a low glass transition temperature for each of PETG resin and PET resin.

Example  6

A three-layered decor sheet having an A / B / A structure was extruded. For the layer A consisting of the surface layer and the backside layer, 70 g of PTT resin was added to 930 g of the PETG resin, and the mixture was extruded and compounded. After the extrusion compounding, 150 g of PTT resin was added to 850 g of PET resin. And extruded at 0.3 mm. The thickness ratio of each layer was adjusted to 1: 8: 1. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

The PTT resin used had a low glass transition temperature for each of PETG resin and PET resin.

Example  7

A three-layered decor sheet having an A / B / A structure was extruded. For the A layer consisting of the surface layer and the backside layer, 70 g of PBT resin was added to 930 g of PETG resin, and the mixture was used after extrusion compounding. In the intermediate layer, 850 g of PET resin was added with 150 g of PBT resin and extrusion compound was used. And extruded at 0.3 mm. The thickness ratio of each layer was adjusted to 1: 8: 1. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

The PBT resin used had a low glass transition temperature for each of PETG resin and PET resin.

Comparative Example  One

1000g of PETG resin alone was extruded to 0.3 mm to prepare a deco sheet.

Comparative Example  2

1000g of PET resin alone was extruded and squeezed to 0.3 mm to prepare a decor sheet.

Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

Comparative Example  3

40 g of PBT resin was added to 960 g of PETG resin, extrusion compounded, and then extruded at 0.3 mm to prepare a decor sheet.

Comparative Example  4

150 g of PBT resin was added to 850 g of PETG resin, extrusion compounded, and extruded at 0.3 mm to prepare a deco sheet.

Comparative Example  5

A three-layered decor sheet having an A / B / A structure was extruded. For the A layer constituting the surface layer and the backside layer, 70 g of PBT resin was added to 930 g of the PET resin, and the mixture was used after extrusion compounding. In the intermediate layer, 850 g of PET resin was added with 150 g of PBT resin, And extrusion-molded at 0.3 mm. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

The PBT resin used had a low glass transition temperature for each of PETG resin and PET resin.

Comparative Example  5

A three-layered decor sheet having an A / B / A structure was extruded. The A layer constituting the surface layer and the back layer were used for 1000 g PETG resin, and the intermediate layer PET resin 1000 g was extruded by 0.3 mm using the above two samples. Thereafter, the hard coat layer composed of an acrylic resin was coated through a thermal transfer method.

evaluation

evaluation

Experimental Example  One: Modulus of elasticity  Lower temperature measurement (moldable temperature)

For evaluating the formability of the sheet produced according to Example 1-6 and Comparative Example 1-6, the change in the modulus of elasticity with temperature was measured using DMA (Dynamic Mechanical Analysis) The transition temperatures are listed in Table 1 below.

3 is a graph showing the storage elastic modulus of the decor sheet according to Example 1 according to the temperature.

4 is a graph showing the storage modulus of the decor sheet of Comparative Example 1 according to the temperature.

5 is a graph showing the storage modulus of the decor sheet of Comparative Example 3 according to the temperature.

6 is a graph showing the storage elastic modulus of the decor sheet of Comparative Example 4 according to the temperature.

Experimental Example  2: evaluation of bending formability

The bending formability was evaluated by the following steps using a vacuum molding machine.

Step 1: 80 占 폚 pre-heating for 2 minutes

Step 2: Decompression at 2 bar, 1 minute

Step 3: Decompression at 5 bar, 2 min

Step 4: Vacuum disassembly / cooling

The sheet was thermoformed in the above four steps and the formation and knocking phenomenon of the bending portion were visually evaluated in four stages of excellent, excellent, normal, and defective and are shown in Table 1 below.

Very good: ◎

Excellent: ○

Normal: △

Bad: X

Experimental Example  3: Evaluation of surface hardness

The surface hardness of the sheet prepared according to Example 1-6 and Comparative Example 1-6 used pencil hardness and the pencil hardness was evaluated under a load condition of 500 g. The evaluation results are shown in Table 1 below.

Experimental Example  4: Hard coating  Stability evaluation

After the acrylic hard coating layer was transferred, the occurrence of lifting and bubbling was judged visually, and evaluated in four stages of excellent, excellent, normal, and poor, and the results are shown in Table 1 below.

Very good: ◎

Excellent: ○

Normal: △

Bad: X

Experimental Example  5. Surface roughness evaluation

And measured using a micro wave scanner. The results are shown in Table 1 below.

division Flexibility Moldable depth
(cm) Surface Roughness Surface hardness Hard coating stability Tg (占 폚) Modulus of elasticity lowering temperature range (캜) Example 1 ◎ 5 56.6 H ◎ 68 58-72 Example 2 ◎ 4 62.5 H ◎ 72 63-75 Example 3 ◎ 5 69.0 H ◎ 70 62-74 Example 4 ◎ 5 or more 61.9 H ◎ 66 50-70 Example 5 ◎ 5 62.0 H ◎ 69 60-74 Example 6 ◎ 5 57.0 H ◎ 68 58-72 Example 7 ◎ 5 56.8 H ◎ 67 58-72 Comparative Example 1 △ 2 69.5 B N / A 68 70-82 Comparative Example 2 X One 68.2 H X 81 70-85 Comparative Example 3 ○ 3 63.0 B N / A 77 65-80 Comparative Example 4 ◎ 5 49.3 2B N / A 65 55-70 Comparative Example 5 ○ 3 55.4 H X 68 58-72 Comparative Example 6 △ 3 70.1 H ◎ 80 70-82

Referring to Table 1 and FIG. 2 to FIG. 5, a sheet according to Example 1 made of a composite resin composition in which PETT contained 15 wt% of PBT in the intermediate layer and 7 wt% of PBT in the surface layer and the backside layer The ratio of the surface layer and the back layer is relatively smaller than that of the intermediate layer, so that the entire molding temperature range is not affected. Therefore, it can be seen that the flexural formability is excellent and the surface roughness is higher in the case of Comparative Example 4 using only 15 wt% of PBT.

On the other hand, in the case of the sheet of Comparative Example 1 and Comparative Example 3, the surface roughness is good as compared with the embodiment, but if the membrane is inferior in moldability and the bending is severe, a defective molding may occur.

In Comparative Examples 2 and 5, hard coating defects were observed. From the difference between Examples 1-7 and Comparative Example 1, hardness improvement by hard coating can be confirmed.

100, 200: Deco sheet
110: Surface layer
120: backside layer
130: middle layer
150: hard coat layer

Claims (15)

A surface layer, a back layer, and at least one intermediate layer between the surface layer and the back layer,
Wherein the surface layer and the backside layer are independently formed of a first composite resin composition comprising a glycol-modified polyethylene terephthalate resin and an ester-based resin,
Wherein the intermediate layer is formed of a second composite resin composition comprising a polyethylene terephthalate resin and an ester-based resin,
Wherein the ester-based resin has a glass transition temperature lower than the glass transition temperature of the glycol-modified polyethylene terephthalate resin, the ester-based resin has a glass transition temperature lower than the glass transition temperature of the polyethylene terephthalate resin,
Wherein the content of the ester-based resin in the first composite resin composition is 0 to 15% by weight,
Wherein the content of the ester-based resin in the second composite resin composition is 4 to 20% by weight,
Wherein the content of the ester resin in the second composite resin composition of the intermediate layer is higher than the content of the ester resin in the first composite resin composition of each of the surface layer and the back layer,
Wherein the thickness of the intermediate layer is 1 to 20 times the thickness of the surface layer,
Wherein the thickness ratio of the surface layer, the intermediate layer, and the backside layer is 0.5 to 1: 8 to 9: 0.5 to 1
Deco sheet.
delete The method according to claim 1,
Wherein the content of the ester-based resin in the first composite resin composition of the backside layer is higher than the content of the ester-based resin in the first composite resin composition of the surface layer
Deco sheet.
The method according to claim 1,
Wherein the surface layer and the backside layer are composed of more than 0 to 7 wt% of the ester resin in the first composite resin composition
Deco sheet.
The method according to claim 1,
Wherein the intermediate layer contains 5 to 20% by weight of the ester-based resin in the second composite resin composition
Deco sheet.
The method according to claim 1,
Wherein the ester-based resin comprises at least one selected from the group consisting of polybutylene terephthalate, polytrimethylene terephthalate, and combinations thereof
Deco sheet.
The method according to claim 1,
Wherein the first composite resin composition and the second composite resin composition each have a glass transition temperature (Tg) of 68 3
Deco sheet.
The method according to claim 1,
Wherein at least one layer of the sheet further comprises a pigment
Deco sheet.
9. The method of claim 8,
Wherein the content of the pigment is 0.1 to 30% by weight of the first composite resin composition or the second composite resin composition
Deco sheet.
delete delete The method according to claim 1,
When the total thickness is 100 [micro] m to 1000 [
Deco sheet.
The method according to claim 1,
The decor sheet has a moldable temperature range of 60 to 80 DEG C
Deco sheet.
The method according to claim 1,
Further comprising a hard coat layer on top of the surface layer
Deco sheet.
15. The method of claim 14,
Wherein the hard coat layer comprises at least one selected from the group consisting of methyl methacrylate, hydroxyl ethyl methacrylate, methacrylate, ethyl acrylate, and combinations thereof
Deco sheet.

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