JP7250903B2 - surface finishing material - Google Patents

Description

The present invention relates to surfacing materials.

Surface finishing materials are films used to finish the surfaces of furniture, interior and exterior materials for buildings, interior and exterior materials for automobiles, interior and exterior materials for electronic products, and the like. Surface finishing materials can also provide various decorative effects such as pictures, letters, numbers, patterns, and three-dimensional effects to interior and exterior materials for buildings, furniture, interior and exterior materials for automobiles, and interior and exterior materials for electronic products. .

Surface finishing materials are generally manufactured using synthetic resin. Synthetic resins are useful materials used in most industrial fields such as automobiles, electrical and electronic products, packaging materials, and construction, but they cause environmental pollution because they take a long time to decompose naturally. Also, when synthetic resin is incinerated, harmful substances such as dioxin are emitted.

In order to recycle resources and reduce environmental pollution caused by embedding and incineration of synthetic resins, there is a need for surface finishing materials with increased utilization of recycled synthetic resins.

INDUSTRIAL APPLICABILITY The present invention provides a surface finishing material with a novel structure that increases the utilization rate of recycled synthetic resin.

In addition, the present invention provides a novel surface finishing material capable of minimizing variations in hue due to recycled synthetic resin.

The present invention also provides a novel surface finishing material capable of minimizing delamination due to recycled synthetic resin.

The problems to be solved by the present invention are not limited to those mentioned above, and problems not mentioned can be clearly understood by those skilled in the art from the following description.

A surfacing material according to the invention comprises a top layer, a bottom layer, and an intermediate layer disposed between said top layer and said bottom layer. The upper layer is thicker than the lower layer.

A surface finish according to the above invention has a color difference between the CIE LAB color coordinates measured on the top layer side and the CIE LAB color coordinates measured on the bottom layer side.

A surface finish according to the above invention may have a ΔE ₁ greater than 0.5. The ΔE ₁ is the color difference between the CIE LAB color coordinates measured on the top layer side and the CIE LAB color coordinates measured on the bottom layer side.

The surface finishing material according to the above invention may have a ΔE ₂ of 0.2 or less. The ΔE ₂ is the color difference between independent area CIE LAB color coordinates measured on either side of the top layer and the bottom layer.

Other specifics of the embodiments are included in the detailed description and drawings.

INDUSTRIAL APPLICABILITY The present invention can provide a surface finishing material with a novel structure that increases the utilization rate of recycled synthetic resin.

In addition, the present invention can provide a novel surface finishing material capable of minimizing variations in hue due to recycled synthetic resin.

In addition, the present invention can provide a novel surface finishing material capable of minimizing delamination caused by recycled synthetic resin.

The effects of the present invention are not limited to the above-exemplified details, and various effects are included in the present specification.

1 is a schematic diagram of a first surface finish according to the present invention; FIG. Thickness profile of the first facing. FIG. 4 is a schematic diagram of a second surface finish according to the present invention;

Advantages and features of the invention, as well as the manner in which they are achieved, will become apparent with reference to the embodiments and experiments described in detail below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only for facilitating understanding of the technical ideas disclosed herein, and should not be construed as limiting the technical ideas by the accompanying drawings.

In addition, the invention is not limited to the contents disclosed below, but can be embodied in various forms. The following material is provided to complete the disclosure of the invention and to fully convey the scope of the invention to those of ordinary skill in the art to which the invention pertains. It is only defined by the category of

If it is determined that a detailed description of related known technology obscures the gist of the technology, the detailed description may be omitted.

The same reference numbers throughout the specification refer to the same components. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of illustration.

Of course, although first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one component from another and, of course, a first component may be a second component unless otherwise stated. is.

Throughout the specification, each element may be singular or plural unless otherwise specified.

Throughout the specification, when a part is referred to as "including" or "having" an element, this does not exclude other elements unless specifically stated otherwise. It means that it may further contain other components.

Throughout the specification, references to "A and/or B" mean A, B or A and B, unless otherwise specified; references to "C to D" specifically refer to means C or more and D or less unless otherwise specified.

When an element or layer is referred to as being “on” or “on” another element or layer, it means not only directly above the other element or layer, but also other elements or layers in between. It includes both through layers or other elements. On the other hand, when an element is referred to as "directly on" or "directly above," it indicates that there is no other element or layer in between.

The spatially relative terms “below,” “beneath,” “lower,” “above,” “upper,” etc. are indicated in the drawings. may be used to readily describe the relationship of one element or component to another element or component, as described above. Spatially relative terms should be understood to include different orientations of the elements during use or operation in addition to the orientation shown in the drawings.

In the following, the invention will be explained in more detail with reference to the drawings.

In one embodiment of the present invention, a CIE LAB color measured on the upper layer side, comprising: an upper layer; a lower layer having a thickness smaller than that of the upper layer; and an intermediate layer disposed between the upper layer and the lower layer. Provide a surface finish in which there is a color difference between the coordinates and the CIE LAB color coordinates measured on the underlayer side.

Recycled synthetic resin is produced by recycling waste synthetic resin and is manufactured in the form of pellets. Recycled synthetic resin has lower lightness and higher yellowness than virgin synthetic resin due to the impurities contained therein, and variations in hue between pellets.

In addition, recycled synthetic resins tend to deteriorate during the process. For this reason, a yellowing phenomenon appears in the recycled synthetic resin.

Due to the physical properties of the recycled synthetic resin and deterioration during the process, the surface finishing material containing the recycled synthetic resin may have an increased degree of yellowness compared to the existing surface finishing material, and the higher the content of the recycled synthetic resin, the more Yellowness can be further increased. Therefore, the surface finishing material containing the recycled synthetic resin has limitations in achieving the same level of chromaticity or color difference as the existing surface finishing material. Existing surface finishing materials contain only virgin synthetic resin as the synthetic resin contained therein.

FIG. 1 shows a schematic representation of a first surface finish 100 according to the invention. The first surface finishing material 100 contains a recycled synthetic resin, and even when a high content of recycled synthetic resin is used, the same level of chromaticity or color difference as that of the existing surface finishing material can be achieved. Utilization rate of recycled synthetic resin is increased.

Referring to FIG. 1, first facing 100 includes top layer 10 , bottom layer 20 and middle layer 30 . Intermediate layer 30 may be placed directly between top layer 10 and bottom layer 20 . The first facing material 100 can be made by an extrusion process, for example, the first facing material 100 can be a three-layer coextruded film, including an upper layer 10, a lower layer 20 and an intermediate layer 30. .

When the first surface finishing material 100 adheres to the surface of furniture, interior and exterior materials for buildings, interior and exterior materials for automobiles, interior and exterior materials for electronic products (hereinafter referred to as "furniture etc."), the surface of the furniture etc. Based on the surface, the upper layer 10 is arranged farther from the surface of the furniture or the like than the lower layer 20, and the lower layer 20 is arranged closer to the surface of the furniture or the like than the upper layer 10.例文帳に追加On the other hand, when the first surface finishing material 100 adheres to the surface of furniture or the like, the upper layer 10 is arranged closer to the user than the lower layer 20, based on the user using the first surface finishing material 100, The lower layer 20 is positioned farther from the user than the upper layer 10 .

The upper layer 10 and the lower layer 20 contain virgin synthetic resin as a main component, and the intermediate layer 30 contains a recycled synthetic resin as a main component. The intermediate layer 30 has a thickness compared to the upper layer 10 and the lower layer 20, and the content of the recycled synthetic resin contained in the intermediate layer 30 is the total synthetic resin used for the upper layer 10, the lower layer 20 and the intermediate layer 30. Based on the weight, it is 60% by weight or more. In order to increase the utilization rate of the recycled synthetic resin, the content of the recycled synthetic resin contained in the intermediate layer 30 is preferably 70% based on the weight of the total synthetic resin used in the upper layer 10, the lower layer 20 and the intermediate layer 30. It may be at least 80% by weight, more preferably at least 80% by weight.
[Reason for correction, etc.]
Corrected a mistake in writing "thickness" instead of "thickness".
[others]
This correction does not correspond to correction of mistranslation but correction of clerical error.

The inventors of the present application used recycled synthetic resin pellets, which have the same level of lightness, yellowness, and color uniformity among pellets as virgin synthetic resin, as a raw material, and finished the surface according to the physical properties of the raw material itself. Minimized increase in wood yellowness. In this regard, for example, the brightness is about 80, the maximum yellowness is less than about 1, and the average yellowness is less than about 1, based on virgin synthetic resin, the brightness is about 75. Recycled synthetic resin pellets having a maximum yellowness index of less than about 2 and an average yellowness index of less than about 2 can be used.

The inventors of the present application reduce the yellowness of the intermediate layer 30 due to yellowing during the process to obtain a first surface finish 100 that exhibits a similar level of chromaticity or color difference to existing surface finishes. Therefore, the upper layer 10 is designed to be thicker than the lower layer 20 . In addition, the inventors of the present application have found that when the first facing material 100 is applied to a surface such as furniture, the top layer 10 is positioned closer to the user relative to the user than the bottom layer 20. Therefore, the upper layer 10 is designed to be thicker than the lower layer 20 in order to reduce the yellowness perceived by the user.

The top layer 10 has a thickness compared to the bottom layer 20 so that the first surfacing 100 has CIE LAB color coordinates measured on the top layer 10 side and CIE LAB color coordinates measured on the bottom layer 20 side. There is a color difference between the color coordinates. In other words, the first surface finish 100 satisfies ΔE ₁ greater than 0.5. ΔE ₁ is the color difference between the CIE LAB color coordinates measured on the top layer 10 side and the CIE LAB color coordinates measured on the bottom layer 20 side. For example, ΔE ₁ may be greater than 0.5 to 2.0.

For example, a white or cream hue with an L value of CIE LAB color coordinates greater than 80 may have a ΔE ₁ of 0.5 or more and less than 0.8, or an L value of CIE LAB color coordinates of 50 Colored hues that are greater than 80 and less than 80 may have a ΔE ₁ greater than or equal to 0.8 and less than or equal to 2.0. The thickness ratio between the upper layer 10 and the lower layer 20 may be, for example, 2:1 to 3:1.

On the other hand, if the thicknesses of the upper layer 10 and the lower layer 20 are the same, ΔE ₁ is approximately 0.5. For example, a white or cream hue with an L value of greater than 80 in the CIE LAB color coordinates may have a ΔE ₁ of about 0.2 or greater and less than or equal to about 0.3; Colored hues with values greater than 50 and less than 80 may have a ΔE ₁ greater than or equal to about 0.4 and less than or equal to about 0.6.

The recycled synthetic resin exhibits an intrinsic viscosity drop (I.V. Drop) during the process, and the viscosity drop results in color variations from site to site in the process result. The inventors of the present application controlled the rotation speed (rpm) of the extrusion screw and the input amount of the raw material to minimize or suppress the deterioration of the recycled synthetic resin, so that the color of the three-layer coextruded film by region We were able to ensure safety. Specifically, the inventors of the present application have found that under the process conditions of the existing surface finishing material, the rotation speed (rpm) of the extrusion screw is reduced and the input amount of the raw material is increased to reduce the deterioration of the recycled synthetic resin. could be minimized or suppressed.

The first surface finishing material 100 satisfies that ΔE ₂ is 0.2 or less. ΔE ₂ is the color difference between independent area CIE LAB color coordinates measured on either side of the top layer 10 or the bottom layer 20 . In other words, the first surface finishing material 100 satisfies that the color difference (ΔE ₂ ) between the CIE LAB color coordinates of the first region and the CIE LAB color coordinates of the second region is 0.2 or less. . At this time, the CIE LAB color coordinates of the first region and the CIE LAB color coordinates of the second region are measured on either the upper layer 10 or the lower layer 20, and the first region is the second region. It is an independent space that is spatially separated from

On the other hand, the inventors of the present application want to ensure the thickness uniformity of the first surface finishing material 100 by stabilizing the raw material flow, bank stabilizing between the polishing rolls. was made. Specifically, the thickness variation between independent regions within the first facing 100 may be within ± 5 μm. The thickness profile of the first facing 100 is shown in FIG.
[Reason for correction, etc.]
Before correcting the mistranslation, it was written as "・5 μm".
Paragraph [52] of International Publication WO2020/040405 describes " ± 5 µm".
The "・" in "・5μm" that was written before the mistranslation was corrected was caused by garbled characters, so the mistranslation was corrected to "±" according to the original text.

In FIG. 3, a schematic diagram of a second surface finish 200 is shown. The second facing 200 comprises the first facing 100 of FIG. The second surface finishing material 200 differs from the first surface finishing material 100 in that it further includes a first functional layer 40 and/or a second functional layer 50 .

If the second facing 200 further comprises a first functional layer 40 , the top layer 10 may be arranged between the first functional layer 40 and the intermediate layer 30 . For example, first functional layer 40 may be placed directly on top layer 10 . If the second facing 200 further comprises a second functional layer 50 , the lower layer 20 may be positioned between the second functional layer 50 and the intermediate layer 30 . For example, second functional layer 50 may be placed directly on lower layer 20 .

The first functional layer 40 may be laminated, laminated, or coated on the upper layer 10, and serves as at least one of a scratch-resistant reinforcing layer, an anti-glare layer (AR), and an anti-reflection layer (AR). is possible. The second functional layer 50 may be laminated, interleaved, or coated on the lower layer 20, and may play at least one role of a primer layer, an adhesive layer, and an adhesive layer.

When the first functional layer 40 and/or the second functional layer 50 are laminated or coated on the surface of a single-layer film composed only of recycled synthetic resin, the first functional layer 40 and the single-layer film delamination between and/or between the second functional layer 50 and the monolayer film appears.

Further, when the first functional layer 40 and/or the second functional layer 50 are laminated or coated on the surface of a single-layer composite film made of a mixture of a recycled synthetic resin and a virgin synthetic resin, the first Although delamination between the functional layer 40 and the single layer composite film and/or between the second functional layer 50 and the single layer composite film can be eliminated to some extent, the single layer composite film has a recycled synthetic resin content. There is a limit to increasing

The second surface finish 200 minimizes or prevents delamination between the top layer 10 and the first functional layer 40 and/or delamination between the bottom layer 20 and the second functional layer 50, while maintaining the intermediate Layer 30 may contain that content of recycled synthetic resin.

Hereinafter, the synthetic resin used for the upper layer 10 is referred to as the first synthetic resin, the synthetic resin used for the lower layer 20 is referred to as the second synthetic resin, and the synthetic resin used for the intermediate layer 30 is referred to as the third synthetic resin. It is called synthetic resin.

In order to minimize or suppress delamination between the upper layer 10 and the first functional layer 40 and/or delamination between the lower layer 20 and the second functional layer 50, the first synthetic resin and/or the second The synthetic resin may contain polar functional groups.

The first synthetic resin and the second synthetic resin may contain a virgin synthetic resin having a polar functional group as a main component. For example, the first synthetic resin and the second synthetic resin may be glycol-modified polyester resins.

The first synthetic resin may further contain a recycled synthetic resin, but the higher the content of the recycled synthetic resin, the more likely separation between the upper layer 10 and the first functional layer 40 may occur, and the yellowness may increase. can increase, the content of the recycled synthetic resin can be determined by considering the presence or absence of peeling between the upper layer 10 and the first functional layer 40 and the degree of yellowness. For example, the content of the recycled synthetic resin may be less than 10% by weight, preferably less than 5% by weight, more preferably 0% by weight, based on the total weight of the first synthetic resin. % by weight.

The second synthetic resin may further contain a recycled synthetic resin, but the higher the content of the recycled synthetic resin, the more likely separation between the lower layer 20 and the second functional layer 50 will occur, and the yellowness will increase. can increase, the content of the recycled synthetic resin can be determined by considering the presence or absence of peeling between the lower layer 20 and the second functional layer 50 and the degree of yellowness. For example, the content of the recycled synthetic resin may be less than 10% by weight, preferably less than 5% by weight, more preferably 0% by weight, based on the total weight of the second synthetic resin. % by weight.

On the other hand, the third synthetic resin contains a recycled synthetic resin as a main component. For example, the third synthetic resin may be a recycled polyester resin.

The content of the recycled synthetic resin in the third synthetic resin is 60% by weight or more, preferably 70% by weight, based on the total weight of the first synthetic resin, the second synthetic resin, and the third synthetic resin. % or more, more preferably 80% by weight or more. Ensure surface adhesion between the upper layer 10 and the first functional layer 40 and/or between the lower layer 20 and the second functional layer 50, minimize yellowness, and improve the existing surface finish In order to ensure the same level of quality as the material, the third synthetic resin is 85% by weight based on the total weight of the first synthetic resin, the second synthetic resin and the third synthetic resin. good too.

The third synthetic resin may further contain a virgin synthetic resin, but from the perspective of resource recycling, the content of the virgin synthetic resin contained in the third synthetic resin may be less than 10% by weight. , preferably less than 5% by weight, more preferably 0% by weight.

For example, the first synthetic resin and the second synthetic resin may consist of virgin glycol-modified polyethylene terephthalate (G-PET), and the third synthetic resin may consist of recycled polyethylene terephthalate (R-PET). . In this case, for example, the content of G-PET may be 16% by weight and the content of R-PET may be 84% by weight.

<Production Example 1>
Utilizing three extruders equipped with twin screws and vents to remove humes generated by the raw materials, the thickness ratio of top layer 10/middle layer 30/bottom layer 20 is 12/84/ 4, a facing 100 composed of three layers of coextruded films was fabricated. The charging ratio of the raw material was 0.7%, and the rotation speed of the screw was 300 rpm.

Virgin glycol-modified polyethylene terephthalate (virgin G-PET) was used as the raw material for the upper layer 10 and the lower layer 20, and recycled polyethylene terephthalate (R-PET) was used as the raw material for the intermediate layer 30. Virgin G-PET has a brightness of about 80, a maximum yellowness of about 1, and an average yellowness of less than about 1 has been used; R-PET has a brightness of about 75, and a maximum yellowness of about 1. A yellowness index of about 2 and an average yellowness index of less than about 2 were used.

<Production Example 2>
A hard coating layer 40 was coated on the upper layer 10 of the three-layer coextruded film obtained in Production Example 1 to produce a surface finishing material 200 .

<Comparative Example 1>
A surfacing material composed of three layers of coextruded films in the same manner as in Production Example 1, except that the thickness ratio of the upper layer 10/intermediate layer 30/lower layer 20 was changed to 8/84/8. (Surface finishing material of Comparative Example 1) was produced.

<Comparative Example 2>
A surfacing material composed of a single layer film was produced using a single extruder equipped with twin screws and a vent for removing humes generated from raw materials. After that, a surface finishing material of Comparative Example 2 was obtained by coating a hard coating layer on the surface finishing material composed of the single-layer composite film. The charging ratio of the raw material was 0.7%, and the rotation speed of the screw was 300 rpm.

R-PET was used as the raw material for the monolayer film. R-PET was used with a brightness of about 75, a maximum yellowness of about 2, and an average yellowness of less than about 2.

<Comparative Example 3>
A surfacing material composed of a single-layer composite film was produced using a single extruder equipped with twin screws and a vent for removing humes generated from raw materials. After that, a surface finishing material of Comparative Example 3 was obtained by coating a hard coating layer on the surface finishing material composed of the single-layer composite film. The charging ratio of the raw material was 0.7%, and the rotation speed of the screw was 300 rpm.

A mixture of virgin G-PET and R-PET having a composition ratio of 1:1 was used as the raw material for the single-layer composite film. Virgin G-PET has a brightness of about 80, a maximum yellowness of about 1, and an average yellowness of less than about 1 has been used; R-PET has a brightness of about 75, and a maximum yellowness of about 1. A yellowness index of about 2 and an average yellowness index of less than about 2 were used.

<Experimental example>
Color difference measurement
The color difference of each of the surface finishing material 100, the surface finishing material 200, and the surface finishing materials of Comparative Examples 1 to 3 was measured using a color difference meter having the following specifications. Table 1 organizes the measured color difference values.

(Specifications of color difference meter)
-Lighting/inspecting system: 8/d (8° Falloff/diffuse reflection), SCI (include Flat Mirror Light)
-Inspection condition: D65, F11, A

Confirmation of the presence or absence of delamination Using the surface finishing material 200 and the surface finishing materials of Comparative Examples 2 and 3, the presence or absence of delamination was confirmed. Table 2 summarizes the results of confirming the presence or absence of delamination.

Since R-PET itself has no adhesion to the functional layer due to the absence of a glycol component, delamination occurred in the R-PET single product (surface finishing material of Comparative Example 2). Although the surface finishing material of Comparative Example 3 contains virgin G-PET, virgin G-PET is not selectively oriented in the upper region or the lower region of the monolayer composite film, so virgin G-PET is added to R-PET. Partial delamination also occurred when the two were mixed.

As described above, the embodiments have been described with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various forms different from each other can be made by combining the contents of each embodiment. It should be understood that a person having ordinary knowledge in the technical field to which the invention pertains can implement it in other specific forms without changing the technical idea or essential features of the invention. can be done. Accordingly, the embodiments described above are to be understood in all respects as illustrative and not restrictive.

100, 200 surface finishing material 10 upper layer 20 lower layer 30 intermediate layer 40 first functional layer 50 second functional layer

Claims (9)

a top layer comprising a virgin synthetic resin;
a lower layer containing the virgin synthetic resin; and
an intermediate layer containing a recycled synthetic resin disposed between the upper layer and the lower layer;
the thickness ratio of the upper layer to the lower layer is 2:1 to 3 : 1;
ΔE1 is greater than 0.5, wherein ΔE1 is the color difference between the CIE LAB color coordinates measured on the top layer side and the CIE LAB color coordinates measured on the bottom layer side;
surface finish. ΔE2 is less than or equal to 0.2, said ΔE2 being the color difference between independent area CIE LAB color coordinates measured on either side of said top layer and said bottom layer;
The surface finishing material according to claim 1. at least one of the upper layer and the lower layer further comprises a polar functional group;
The surface finishing material according to claim 1. a first functional layer;
the first functional layer functions as at least one of a scratch resistant layer, an antiglare layer (AR), and an antireflection layer (AR);
the top layer is disposed between the first functional layer and the intermediate layer;
The surface finishing material according to claim 1. a second functional layer;
The second functional layer functions as at least one of a primer layer, an adhesive layer and an adhesive layer,
the lower layer is disposed between the second functional layer and the intermediate layer;
The surface finishing material according to claim 1. at least one of the upper layer and the lower layer further comprises a polar functional group;
The surface finishing material according to claim 2. a first functional layer;
the first functional layer functions as at least one of a scratch resistant layer, an antiglare layer (AR), and an antireflection layer (AR);
the top layer is disposed between the first functional layer and the intermediate layer;
The surface finishing material according to claim 2. a second functional layer;
The second functional layer functions as at least one of a primer layer, an adhesive layer and an adhesive layer,
the lower layer is disposed between the second functional layer and the intermediate layer;
The surface finishing material according to claim 2. The thickness deviation between independent regions is within ±5 μm.
The surface finishing material according to claim 2.

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