KR102755744B1 - Matte sheet comprising matting compound composition - Google Patents

Abstract

The present invention relates to a matte sheet comprising a matting compound composition, and more specifically, to a matte sheet comprising a substrate layer and a surface (skin) layer, wherein the surface layer is formed using a matting compound composition comprising PMMA (Polymethyl methacrylate), crosslinked PMMA beads, and an impact modifier, and thus the matte sheet is characterized by excellent matting effect and impact resistance.

Description

{MATTE SHEET COMPRISING MATTING COMPOUND COMPOSITION}

The present invention relates to a matte sheet comprising a matting compound composition, and more specifically, to a matte sheet comprising a substrate layer and a surface (skin) layer, wherein the surface layer is formed using a matting compound composition comprising PMMA (Polymethyl methacrylate), crosslinked PMMA beads, and an impact modifier, and thus the matte sheet is characterized by excellent matting effect and impact resistance.

Matte sheets are sheets manufactured to have a matte function by covering one or two outer layers with a matte composition, and are distinguished from glossy sheets. Matte sheets can prevent eye fatigue and the disclosure of packaged contents that are seen in glossy sheets, and can provide elegance to products. In addition, as the level of emotional quality of consumers has recently improved, the demand for matte sheets has increased in order to provide a sophisticated texture to materials. Accordingly, they have recently been used directly or in combination with food packaging, book covers, shopping bags, etc. The applications are also gradually increasing, and the market share compared to glossy sheets has already exceeded 50% in advanced countries such as Japan.

Meanwhile, PMMA (Poly Methyl MethAcrylate) is used by copolymerizing MMA and MA (MethylAcrylate) or EA (EthylAcrylate), and is characterized by the highest transmittance (93%) among transparent resins, excellent weather resistance and surface hardness, and a beautiful appearance.

PMMA sheets are used as lenticular light guide plates for LED TVs and LED lighting, and are also used for general industrial purposes such as advertising boards and interior boards, and recently, they are also being used as partitions to prevent the spread of coronavirus.

In particular, matte sheets for partitions are used overseas, and the matte phenomenon is caused by a diffuse reflection phenomenon due to the unevenness of the reflective surface. Methods for imparting matte properties to the surface include 1) a method of surface treating the surface of a general film by coating and etching, 2) a method of utilizing the differences in flowability, shrinkage, and refractive index between mixed resins, which are characteristics of a resin mixture that has incompatibility, 3) a method of imparting unevenness to the surface by utilizing inorganic substances, and 4) an embossing method of imparting unevenness to a cooling roll.

In general, the above method 1) is not widely used because it requires separate post-processing facilities such as coating and drying facilities, and methods 2) to 4) or a mixed method of these are used commercially.

In order to make the sheet surface matte, it is necessary to create an uneven surface (embossing) on the sheet surface. In order to create an embossing on the sheet surface, there are two methods: processing the polishing roll surface and transferring it during sheet extrusion, and co-extruding a matting compound as a surface layer. Meanwhile, most of the matting compounds used in the method of co-extruding the matting compound as a surface layer depend on imported products from overseas, and therefore, domestic production is necessary.

In this regard, Korean Patent No. 10-2382945 discloses a matting polymer composition comprising two types of styrene-acrylonitrile copolymers having different acrylonitrile contents and a matting agent, and a matte sheet comprising the same.

The purpose of the present invention is to solve the problems of the above-mentioned prior art, and to provide a matte sheet including a matte compound composition that can contribute to domestic production by replacing matte compounds that depend on imports.

In addition, the present invention provides a matte sheet having excellent matting effect and impact resistance.

As a technical means for achieving the aforementioned technical task, one aspect of the present invention is,

A matte sheet comprising: a substrate layer; and a surface layer formed on one or both surfaces of the substrate layer and including a matte compound composition; wherein the matte compound composition comprises: first PMMA (Polymethyl methacrylate) having a melt index (MI) of 10 to 15 g/10 min; crosslinked PMMA beads; and an impact modifier.

The content of the first PMMA may be 15 to 85 wt% based on the total weight of the gloss-blocking compound composition.

The content of the cross-linked PMMA beads may be 5 to 30 wt% based on the total weight of the gloss-quenching compound composition.

The content of the above impact modifier may be 5 to 30 wt% based on the total weight of the above-mentioned light-absorbing compound composition.

The above cross-linked PMMA beads may have a diameter of 3 to 100 μm.

The above impact modifier may include an acrylic compound.

The above-mentioned gloss-blocking compound composition may further include a second PMMA having a melt index (MI) of 1.5 to 2 g/10 min.

The content of the second PMMA may be 20 to 70 wt% based on the total weight of the gloss-blocking compound composition.

The above-mentioned substrate layer may include at least one selected from the group consisting of polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polypropylene (PP), polyacrylate, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), polyamide, styrene-acrylonitrile copolymer (SAN), acrylonitrile-butadiene-styrene (ABS), acrylonitrile-styrene-acrylate (ASA), and mixtures thereof.

The above matte sheet may be laminated by co-extrusion of the substrate layer and the surface layer.

The above matte sheet may have a thickness of 2 to 10 mm.

The matte sheet of the present invention has the effect of contributing to domestic production by including a matte compound composition that can replace matte compounds that depend on imports.

In addition, the matte sheet of the present invention has excellent matting effect and impact resistance.

Figure 1 is a photograph of a surface (Skin) layer including cross-linked PMMA beads having a diameter of 60 μm.
Figure 2 is a photograph of a surface (Skin) layer including cross-linked PMMA beads having a diameter of 80 μm.
Figure 3 is a photograph of a surface (Skin) layer including cross-linked PMMA beads having a diameter of 100 μm.

Hereinafter, the present invention will be described in more detail. However, the present invention may be implemented in various different forms and the present invention is not limited to the embodiments described herein, and the present invention is only defined by the claims set forth below.

In addition, the terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. Throughout the specification of the present invention, the term "including" a certain component does not exclude other components, but rather means that other components may be included, unless specifically stated otherwise.

The first aspect of this article is,

A matte sheet including a substrate layer and a surface (Skin) layer is provided.

Hereinafter, a matte sheet according to the first aspect of the present invention will be described.

According to one embodiment of the present invention, the substrate layer may include at least one selected from the group consisting of polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polypropylene (PP), polyacrylate, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), polyamide, styrene-acrylonitrile copolymer (SAN), acrylonitrile-butadiene-styrene (ABS), acrylonitrile-styrene-acrylate (ASA), and mixtures thereof, and preferably may include polymethyl methacrylate (PMMA).

According to one embodiment of the present invention, the surface layer may be formed on one or both sides of the substrate layer.

According to one embodiment of the present invention, the surface layer may include a matting compound composition.

According to one embodiment of the present invention, the light-blocking compound composition may include: first PMMA; cross-linked PMMA beads; and an impact modifier.

Hereinafter, the above-mentioned quenching compound composition will be described in more detail.

According to one embodiment of the present invention, the light-emitting compound composition may include first PMMA (Polymethyl methacrylate).

According to one embodiment of the present invention, the first PMMA may be injection-molded PMMA.

According to one embodiment of the present invention, the first PMMA may have a melt index (MI) of 10 to 15 g/10 min, preferably 12 to 14 g/10 min, more preferably 14 g/10 min.

According to one embodiment of the present invention, the first PMMA may have a heat distortion temperature of 85 to 90°C, preferably 87 to 89°C, more preferably 88°C.

According to one embodiment of the present invention, the content of the first PMMA may be 15 to 85 wt% with respect to the total weight of the gloss-blocking compound composition.

According to one embodiment of the present invention, the light-emitting compound composition may include cross-linked PMMA beads.

The above-mentioned cross-linked PMMA beads may have the effect of maximizing the matte effect, and may be added to impart a matte property to the surface layer (skin) of the sheet when the matte compound composition is applied to the surface layer.

According to one embodiment of the present invention, the cross-linked PMMA beads may have a diameter of 3 to 100 μm. If the diameter of the cross-linked PMMA beads is less than 3 μm, the matte effect may be minimal, and particle agglomeration may occur, which may cause problems such as reduced transmittance and increased haze, which is undesirable. If the diameter exceeds 100 μm, surface imbalance may occur due to particle protrusion on the surface during the extrusion process, and optical properties may deteriorate and mechanical properties such as impact strength may deteriorate, which is undesirable.

According to one embodiment of the present invention, the content of the cross-linked PMMA beads may be 5 to 30 wt% with respect to the total weight of the gloss-quenching compound composition.

According to one embodiment of the present invention, the light-blocking compound composition may include an impact modifier.

By including the above shock-reinforcing agent, impact resistance, mechanical stability, etc. may be improved.

According to one embodiment of the present invention, the content of the impact modifier may be 5 to 30 wt% based on the total weight of the light-absorbing compound composition.

According to one embodiment of the present invention, the impact modifier may include an acrylic compound.

When the above acrylic compound is used as an impact modifier, excellent weather resistance is achieved. When the above acrylic compound has a structure specially designed to have the same refractive index as PMMA, the high transparency, which is an advantage of existing PMMA, can be maintained. As the content of the impact modifier increases, the impact strength of the impact-resistant PMMA increases, and considering other properties such as fluidity/heat resistance/surface hardness, the content can be adjusted and used according to the characteristics of the final application product.

According to one embodiment of the present invention, the light-emitting compound composition may further include a second PMMA.

According to one embodiment of the present invention, the second PMMA may be PMMA for extrusion.

According to one embodiment of the present invention, the second PMMA may have a melting index (MI) of 1.5 to 2 g/10 min, preferably 1.5 to 1.7 g/10 min, more preferably 1.6 g/10 min.

According to one embodiment of the present invention, the second PMMA may have a heat distortion temperature of 95 to 100°C, preferably 97 to 99°C, more preferably 98°C.

According to one embodiment of the present invention, the content of the second PMMA may be 20 to 70 wt% with respect to the total weight of the gloss-blocking compound composition.

According to one embodiment of the present invention, the matting compound composition may further include additives commonly used in the relevant technical field, depending on the purpose and use. For example, it may further include an antioxidant, a UV stabilizer, a heat stabilizer, a lubricant, etc. At this time, the additives may be included in an appropriate amount within a range that does not harm the physical properties of the matting compound composition.

According to one embodiment of the present invention, the matte sheet may be laminated such that the substrate layer and the surface layer are co-extruded.

According to one embodiment of the present disclosure, the coextrusion method may be to manufacture a sheet by melting and laminating each component using a coextruder maintained at a temperature higher than the melting temperature of the substrate layer polymer composition and the surface layer polymer composition. The surface layer polymer composition may include the matting compound composition according to the first aspect of the present disclosure.

According to one embodiment of the present invention, the matte sheet may have a thickness of 2 to 10 mm.

According to one embodiment of the present invention, the co-extrusion means a method of making a multi-layer structure by adding one or more layers when manufacturing a sheet using two or more extruders, and for example, it may be a method of applying a method of bonding a substrate layer and a surface layer (skin layer) extruded from two or more T-die type extruders on a roll. That is, a main extruder for extruding a substrate layer and a sub extruder for extruding a surface layer may be used. The temperature conditions of the extruder may be within a normal range, and specifically, may be performed in a range of 200 to 300°C, more specifically, 220 to 260°C. However, the extrusion temperature may be appropriately changed depending on the type of resin.

The lamination method using these compositions may use a known method, but specifically, a feed block method may be used. The molten resin laminated by the feed block is introduced into a sheet forming die such as a T die, formed into a sheet shape, and then the surface is finished with a forming roll and cooled to perform the process. At this time, the temperature of the die may be 200 to 300°C, specifically 230 to 250°C, and the temperature of the forming roll may be 40 to 150°C, specifically 60 to 110°C, but is not limited thereto.

In addition, through the coextrusion process as described above, a multilayer sheet in a flat shape can be manufactured, and a molded product having a curved design in a special profile shape can be manufactured. However, if the product can be manufactured by melt processing the polymer composition of the base layer and the above-described light-quenching polymer composition, there is no significant limitation on the extrusion method or the shape of the molded product.

The second aspect of this article is,

A molded product manufactured by extruding or injection molding the above-mentioned light-emitting compound composition is provided.

Below, we will explain the molded product according to the second aspect of this invention.

According to one embodiment of the present invention, the molded product has excellent impact strength, and at the same time, the surface roughness of the molded product is uniformly formed, so that it has an excellent matte effect. The processing method of the molded product can be used without major limitations as long as it is a commonly used or known method, and for example, methods such as casting, extrusion, injection, and blow molding can be used, and extrusion or injection processing methods can be preferably used.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

Manufacturing Example: Manufacturing of a Glossy Compound Composition

Manufacturing examples 1 to 4

The matting compound compositions of Manufacturing Examples 1 to 4 were prepared according to the compositions in Table 1 below using a first PMMA (IF850 from LX MMA Co., Ltd.) having a melt index (MI) of 13 g/10 min, a second PMMA (VH6 from Lotte MCC Co., Ltd.) having a melt index of 1.6 g/10 min, cross-linked PMMA beads having a diameter of 20 μm (MH-20FD from ASP Co., Ltd.), and an impact modifier (PR700 from LX MMA Co., Ltd.). The content is wt%.

IF850 VH6 20㎛ PMMA
(MH-20FD) PR700 Manufacturing example 1
(F8-FD-R10) 74.8 - 15 10 Manufacturing example 2
(F8-FD-R15) 69.8 - 15 15 Manufacturing example 3
(F8-FD-R20) 64.8 - 15 20 Manufacturing example 4
(F8VH-FD-R15) 34.8 35 15 15

Manufacturing example 5

A matting compound composition of Manufacturing Example 5 was prepared according to the composition in Table 2 below using a first PMMA (IF850 from LX MMA Co., Ltd.) having a melt index (MI) of 13 g/10 min, a second PMMA (VH6 from Lotte MCC Co., Ltd.) having a melt index of 1.6 g/10 min, cross-linked PMMA beads having a diameter of 30 μm (MH-30FD from ASP Co., Ltd.), and an impact modifier (PR700 from LX MMA Co., Ltd.). The content is wt%.

IF850 VH6 30㎛ PMMA
(MH-30FD) PR700 Manufacturing example 5
(PRMH30-15) 34.8 35 15 15

Manufacturing examples 6 to 8

The matting compound compositions of Manufacturing Examples 6 to 8 were prepared according to the compositions in Table 3 below using a first PMMA (IF850 from LX MMA Co., Ltd.) having a melt index (MI) of 13 g/10 min, a second PMMA (VH6 from Lotte MCC Co., Ltd.) having a melt index of 1.6 g/10 min, cross-linked PMMA beads having a diameter of 40 μm (MH-40FD from ASP Co., Ltd.), and an impact modifier (PR700 from LX MMA Co., Ltd.). The content is wt%.

IF850 VH6 40㎛ PMMA
(MH-40FD) PR700 Manufacturing example 6
(PRMH40-15) 34.8 35 15 15 Manufacturing example 7
(PRMH40-18) 36.8 30 18 15 Manufacturing example 8
(PRMH40-22) 38.8 24 22 15

Manufacturing examples 9 to 12

The matting compound compositions of Manufacturing Examples 9 to 12 were prepared according to the compositions in Table 4 below using a first PMMA (IF850 from LX MMA Co., Ltd.) having a melt index (MI) of 13 g/10 min, a second PMMA (VH6 from Lotte MCC Co., Ltd.) having a melt index of 1.6 g/10 min, cross-linked PMMA beads having a diameter of 60 μm (MH-60FD from ASP Co., Ltd.), and an impact modifier (PR700 from LX MMA Co., Ltd.). The content is wt%.

PRMH60-25
(IF850 (34.8%) + VH6 (25%) + 60㎛ PMMA (25%) + PR700 (15%)) IF850 Manufacturing example 9
(PM60-18) 72.0 28.0 Manufacturing example 10
(PM60-20) 80.0 20.0 Manufacturing example 11
(PM60-23) 92.0 8.0 Manufacturing example 12
(PM60-25) 100.0 0.0

Manufacturing examples 13 to 16

The matting compound compositions of Manufacturing Examples 13 to 16 were prepared according to the compositions in Table 5 below using a first PMMA (IF850 from LX MMA Co., Ltd.) having a melt index (MI) of 13 g/10 min, a second PMMA (VH6 from Lotte MCC Co., Ltd.) having a melt index of 1.6 g/10 min, cross-linked PMMA beads having a diameter of 80 μm (MH-80FD from ASP Co., Ltd.), and an impact modifier (PR700 from LX MMA Co., Ltd.). The content is wt%.

PRMH80-25
(IF850 (34.8%) + VH6 (25%) + 80㎛ PMMA (25%) + PR700 (15%)) IF850 Manufacturing example 13
(PM80-18) 72.0 28.0 Manufacturing example 14
(PM80-20) 80.0 20.0 Manufacturing example 15
(PM80-23) 92.0 8.0 Manufacturing example 16
(PM80-25) 100.0 0.0

Manufacturing examples 17 to 20

The matting compound compositions of Manufacturing Examples 17 to 20 were prepared according to the compositions in Table 6 below using a first PMMA (IF850 from LX MMA Co., Ltd.) having a melting index (MI) of 13 g/10 min, a second PMMA (VH6 from Lotte MCC Co., Ltd.) having a melting index of 1.6 g/10 min, cross-linked PMMA beads having a diameter of 100 μm (MH-100FD from ASP Co., Ltd.), and an impact modifier (PR700 from LX MMA Co., Ltd.). The content is wt%.

PRMH100-25
(IF850 (34.8%) + VH6 (25%) + 100㎛ PMMA (25%) + PR700 (15%)) IF850 Manufacturing example 17
(PM100-18) 72.0 28.0 Manufacturing example 18
(PM100-20) 80.0 20.0 Manufacturing example 19
(PM100-23) 92.0 8.0 Manufacturing example 20
(PM100-25) 100.0 0.0

Comparative manufacturing example 1

ARKEMA's matting compound (trade name: SUPERMATT, grade name: HIF 10) was purchased and used as comparative manufacturing example 1.

Comparative manufacturing example 2

LX MMA's matting compound (XM533 NP) was purchased and used as comparative manufacturing example 2.

Comparative manufacturing examples 3 and 4 (impact modifier X)

Using a first PMMA (IF850 from LX MMA Co., Ltd.) having a melt index (MI) of 13 g/10 min, a second PMMA (VH6 from Lotte MCC Co., Ltd.) having a melt index of 1.6 g/10 min, and crosslinked PMMA beads having a diameter of 20 μm (MH-20FD from ASP Co., Ltd.), matting compound compositions of Comparative Manufacturing Examples 3 and 4 not including an impact modifier were manufactured according to the compositions in Table 7 below. In this case, the content is wt%.

IF850 VH6 20㎛ PMMA
(MH-20FD) Comparative manufacturing example 3
(F8-FD) 84.8 - 15 Comparative manufacturing example 4
(F8VH-FD) 15 69.8 15

Example: Manufacturing of matte sheets

Examples 1 to 20

A matte sheet having a three-layer structure of a surface (Skin) layer/substrate layer/surface (Skin) layer was manufactured using each of the matte compound compositions manufactured according to Manufacturing Examples 1 to 20.

Specifically, Lotte's VH001 (MI: 1.64 g/10 min) was used as the main raw material of the surface layer, and the matte compound compositions manufactured according to Examples 1 to 20 were used as sub-raw materials. Polymethyl methacrylate (PMMA) was used as the substrate layer. The materials used in the surface layer and the substrate layer were melted, co-extruded, and extruded between the first and second rolls through a T-shaped die. The sheets passing through the first and second rolls were passed between the second and third rolls, and cooled with air through a guide roll to manufacture the matte sheets of Examples 1 to 20, respectively.

Comparative example

Comparative examples 1 to 4

Matte sheets of Comparative Examples 1 to 4 were each manufactured in the same manner as in the Examples, except that the matte compound compositions manufactured according to Comparative Examples 1 to 4 were used instead of the matte compound compositions manufactured according to Manufacturing Examples 1 to 20 in the Examples.

Experimental example

The gloss, arithmetic mean roughness (Ra), haze (HAZE), etc. of the matte sheets manufactured according to Examples 1 to 20 and Comparative Examples 1 to 4 were measured.

(1) The gloss of the sheet was measured according to the ASTM D523 standard.

(2) The arithmetic mean roughness (Ra) of the sheet was measured using a KS B 0501 stylus-type surface roughness measuring instrument.

(3) The haze of the sheet was measured using a haze meter according to ASTM D1003.

(4) The thickness of the sheet was measured using a measuring device such as a micrometer according to KS B 5202 (micrometer).

The measurement results of the matte sheets manufactured according to Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 8 below.

Luminescent compound composition Extruder temperature
(℃) Line presence or absence Skin layer thickness
(㎛)
Left / Center / Right Glossiness
(60 degrees) Ra HAZE Sheet thickness
(mm) Comparative Example 1 Comparative manufacturing example 1
(HIF10 from ARKEMA
(MI 1.16)) 260 X 220 / 134 / 202 16.7 1.7 58.90 3.0 250 X 204 / 133 / 214 22.3 1.4 47.84 240 X 190 / 109 / 204 16.4 1.8 59.60 230 X 250 / 113 / 190 21.5 1.4 48.89 220 O 160 / 95 / 174 53.6 1.2 29.76 Comparative Example 2 Comparative manufacturing example 2
(XM533 NP from LX MMA
(MI 1.64)) 260 X 227 / 161 / 191 9.8 3.3 81.99 3.0 250 X 200 / 155 / 196 10 3.6 82.18 240 X 197 / 160 / 198 10.2 3.6 81.08 230 X 226 / 122 / 179 10.3 3.5 80.65 220 X 154 / 130 / 160 10.5 3.2 78.64 Example 4 Manufacturing example 4
(F8VH-FD-R15 (MI 1.53)) 260 X 205 / 118 / 208 15.7 1.95 61.92 3.0 250 X 209 / 161 / 203 17.8 1.6 57.36 240 X 196 / 144 / 192 16 2.05 61.08 230 X 170 / 116 / 165 17.6 1.77 57.83 Example 3 Manufacturing example 3
(F8-FD-R20 (MI 3.65)) 260 X 228 / 169 / 197 18.6 1.55 56.94 3.0 250 X 216 / 170 / 204 18.1 1.65 56.49 240 X 200 / 149 / 196 18.6 1.58 56.49 230 X 122 / 150 / 187 20 1.51 53.97 Example 2 Manufacturing example 2
(F8-FD-R15 (MI 4.13)) 260 Lines only on the sides 203 / 149 / 201 17.4 1.69 59.38 3.0 250 202 / 152 / 200 18.2 1.5 58.18 240 202 / 155 / 186 20.1 1.49 53.53 230 O 185 / 148 / 186 19.9 1.71 53.31 Example 1 Manufacturing example 1
(F8-FD-R10 (MI 5.15)) 240 X 195 / 147 / 204 19.4 1.62 53.97 3.0 230 X 209 / 141 / 189 20.7 1.45 51.5 Comparative Example 3 Comparative manufacturing example 3
(F8-FD (MI 7.87)) 240 O 169(Medium) 26 1.21 42.46 3.0 230 O 165(Medium) 28.3 1.29 38.58 220 O 142(Medium) 24.9 1.27 44.71 Comparative Example 4 Comparative manufacturing example 4
(F8VH-FD (MI 1.38)) 260 X 207 / 138 / 222 21.8 1.6 49.9 3.0 250 O 134(Medium) 26.6 1.4 43.52 240 O 137(Medium) 22.8 1.39 48.89

Referring to Table 8 above, it was confirmed that the matting compound (HIF10) of ARKEMA in Comparative Manufacturing Example 1 caused streaks during extrusion at a low extrusion temperature of approximately 220℃. It was confirmed that the XM533 NP of LX MMA in Comparative Manufacturing Example 2 was extruded stably without causing streaks even when the extrusion temperature changed from 220 to 260℃. In addition, it was confirmed that the HAZE was approximately 80% and the gloss was approximately 10 GU.

In addition, by manufacturing the matte sheets of Examples 1 to 4 using the matte compound compositions manufactured according to Manufacturing Examples 1 to 4, it was confirmed that the melt index (MI) could be controlled through the contents of IF850 and VH6, which are base resins. On the other hand, it was confirmed that lines were formed during extrusion in Comparative Manufacturing Examples 3 and 4, in which no impact agent (PR700) was added, and therefore it was confirmed that it was difficult to produce good products.

The measurement results of the matte sheets manufactured according to Examples 5 to 8 and Comparative Example 2 are shown in Table 9 below. At this time, the arithmetic average roughness (Ra) of the second roll and the third roll used in manufacturing the sheet was 12 μm, and the 10-point average roughness (Rz) was 52 μm.

Luminescent compound composition Sub RPM Skin layer thickness
(㎛)
Left / Center / Right Glossiness
(60 degrees) Glossiness
(85 degrees) Ra HAZE Sheet thickness
(mm) Comparative Example 2 Comparative Manufacturing Example 2 (XM533 NP (MI 1.64) from LX MMA) 40 395 / 275 / 470 4.2 2.4 3.6 87.77 5.4 Example 5 Manufacturing example 5
(PRMH30-15 (MI 1.6)) 30 299 / 198 / 378 11.9 6.9 3.05 70.93 5.8 Example 6 Manufacturing example 6
(PRMH40-15 (MI 1.51)) 30 338 / 235 / 334 11.8 7.6 2.9 71.00 5.8 20 189 / 131 / 197 9.2 4.9 3.8 77.11 Example 7 Manufacturing example 7
(PRMH40-18 (MI 1.59)) 15 189 4.6 2.5 4.1 82.89 5.9 Example 8 Manufacturing example 8
(PRMH40-22 (MI 1.50)) 15 136 4.4 2.4 4.3 86.54 5.8

Referring to Table 9 above, Examples 6 to 8 using cross-linked PMMA beads having a diameter of 40 μm showed that as the content of cross-linked PMMA beads increased, the gloss decreased and the HAZE increased. It was confirmed that Example 8, which used 22% of cross-linked PMMA beads having a diameter of 40 μm, was most similar to the data of Comparative Example 2, i.e., XM533 NP from LX MMA.

In addition, when the sub-RPM of Example 6, which used 15% of cross-linked PMMA beads with a diameter of 40 ㎛, was adjusted to change the thickness of the skin layer, it was confirmed that the sample with a thin skin layer had a higher Ra and lower gloss. This seems to be because the skin layer thickness was thin compared to the bead size, causing the beads to protrude outward.

The measurement results of the matte sheets manufactured according to Examples 9 to 20 are shown in Table 10 below. At this time, the roll used for manufacturing the sheet was a polishing roll. In addition, a photograph of a surface layer having a diameter of 60 μm of crosslinked PMMA beads is shown in Fig. 1, a photograph of a surface layer having a diameter of 80 μm is shown in Fig. 2, and a photograph of a surface layer having a diameter of 100 μm is shown in Fig. 3.

Luminescent compound composition Sub RPM Skin layer thickness
(㎛) Glossiness
(60 degrees) Glossiness
(85 degrees) Ra HAZE Sheet thickness
(mm) Example 9 Manufacturing Example 9 (PM60-18) 15 160 4.8 2.2 4.7 85.92 5.8~5.9 Example 10 Manufacturing Example 10 (PM60-20) 170 4.7 2.3 5.5 87.48 Example 11 Manufacturing Example 11 (PM60-23) 140 3.8 1.5 6.5 90.70 Example 12 Manufacturing Example 12 (PM60-25) 160 3.8 1.7 6.9 90.92 Example 13 Manufacturing Example 13 (PM80-18) 15 150 6.4 2.7 5.6 85.68 5.8~5.9 Example 14 Manufacturing Example 14 (PM80-20) 200 4.9 2 6.5 87.84 Example 15 Manufacturing Example 15 (PM80-23) 200 4.9 2 6 87.31 Example 16 Manufacturing Example 16 (PM80-25) 250 4.9 2.1 6.2 87.33 Example 17 Manufacturing Example 17 (PM100-18) 15 170 6 2.6 6.9 83.69 5.8~5.9 Example 18 Manufacturing Example 18 (PM100-20) 180 5.5 2.3 6.6 87.37 Example 19 Manufacturing Example 19 (PM100-23) 200 4.1 1.6 - 88.80 Example 20 Manufacturing Example 20 (PM100-25) 230 4.2 1.5 9.3 90.80

Referring to Table 10 above and FIGS. 1 to 3, it can be confirmed that the larger the diameter of the cross-linked PMMA beads, the larger the Ra value, and as the content of the cross-linked PMMA beads increases, the gloss decreases and the HAZE value increases.

Referring to Tables 8 to 10 above, a matte sheet having desired properties can be manufactured by adjusting the contents of the first PMMA, the second PMMA, the cross-linked PMMA beads, and the impact modifier to suit the gloss, Ra, HAZE, etc. desired by the user, thereby manufacturing a matte compound composition.

Above, the present invention has been described in detail with reference to the drawings and preferred embodiments, but the scope of the technical idea of the present invention is not limited to these drawings and embodiments. Therefore, various modified examples or equivalent embodiments may exist within the scope of the technical idea of the present invention. Therefore, the scope of the technical idea according to the present invention should be interpreted by the claims, and technical ideas within the scope equivalent or equivalent thereto should be interpreted as belonging to the scope of the present invention.

Claims (11)

A matte sheet comprising a substrate layer; and a surface layer formed on one or both sides of the substrate layer and including a matte compound composition;
The above-mentioned light-emitting compound composition is,
A first PMMA (Polymethyl methacrylate) having a melt index (MI) of 14 g/10 min; cross-linked PMMA beads; and an impact modifier;
The content of the cross-linked PMMA beads is 5 to 30 wt% based on the total weight of the gloss-quenching compound composition,
The above-mentioned gloss-blocking compound composition further comprises a second PMMA having a melt index (MI) of 1.6 g/10 min;
The above substrate layer is polymethyl methacrylate (PMMA).
A matte sheet, characterized in that the thickness of the matte sheet is 2 to 6 mm. In the first paragraph,
A matte sheet, characterized in that the content of the first PMMA is 15 to 85 wt% based on the total weight of the matte compound composition. delete In the first paragraph,
A matte sheet, characterized in that the content of the impact modifier is 5 to 30 wt% based on the total weight of the matte compound composition. In the first paragraph,
A matte sheet characterized in that the cross-linked PMMA beads have a diameter of 3 to 100 ㎛. In the first paragraph,
A matte sheet characterized in that the above impact modifier comprises an acrylic compound. delete In the first paragraph,
A matte sheet, characterized in that the content of the second PMMA is 20 to 70 wt% based on the total weight of the matte compound composition. delete In the first paragraph,
The above matte sheet is a matte sheet characterized in that the substrate layer and the surface layer are laminated by co-extrusion. delete