TW202430372A - Laminated Sheets - Google Patents

Abstract

The present invention relates to a laminated sheet, which is laminated with a first resin substrate, an intermediate layer and a second resin substrate in sequence, and the first resin substrate and the intermediate layer are of the same shape and size and are laminated to form a laminated portion, the first resin substrate is a quadrilateral when observed from the normal direction of the surface of the first resin substrate, and the second resin substrate is larger in area than the first resin substrate. and the intermediate layer, and when observed from the normal direction of the surface of the first resin substrate, at a corner including the vertex where the first side and the second side of the first resin substrate intersect orthogonally, there is a protrusion protruding from the first side, the vertex and the outer edge of the second side, the length of the protrusion protruding from the first side in a first direction orthogonal to the first side is not less than 5 mm and not more than 20 mm, the length of the protrusion in a direction parallel to the first side from the intersection of the protrusion and the first side is not less than 10 mm and not more than 40 mm, the length of the protrusion in a second direction orthogonal to the second side from the second side is not less than 5 mm and not more than 20 mm, and the length of the protrusion in a direction parallel to the second side from the intersection of the protrusion and the second side is not less than 10 mm and not more than 40 mm.

Description

Laminated Sheets

The present invention relates to a laminated sheet.

When manufacturing electronic devices such as solar cells, liquid crystal panels (LCD), organic EL (Electroluminescence) panels (OLED), and receiving sensor panels that sense electromagnetic waves, X-rays, ultraviolet rays, visible rays, infrared rays, etc., a polyimide resin layer is used as a substrate. The polyimide resin layer is used in the form of a laminated body disposed on a glass substrate, and the laminated body is provided for the manufacture of electronic devices. The laminated body having a polyimide resin layer is provided with an adsorption layer such as a polysilicone resin layer on a glass substrate, and a polyimide resin layer is formed on the adsorption layer. When forming a laminate having a polyimide resin layer, a protective film is provided on an adsorption layer such as a silicone resin layer on a glass substrate. A laminate having a polyimide resin layer is manufactured by using, for example, a release film, an adsorption layer, and a protective film. In the laminate, after cutting the release film and the adsorption layer, after removing the useless part, the protective film is peeled off, the adsorption layer is attached to the glass substrate, and the adsorption layer is provided on the glass substrate. With the adsorption layer on the glass substrate, a polyimide resin layer is formed on the adsorption layer as described above.

Regarding the peeling of the protective film of the above-mentioned laminate, there has been proposed (Patent Document 1). More specifically, Patent Document 1 discloses a double-sided adhesive sheet for electronic components, which comprises: an adhesive layer; a first peeling sheet, which is attached to one side of the adhesive layer and has at least the first peeling layer; and a second peeling sheet, which is attached to the other side of the adhesive layer and has at least the second peeling layer; and the first peeling layer mainly comprises an olefin resin, and the second peeling layer mainly comprises a diene polymer material, and the peeling force of the first peeling sheet on the adhesive layer is set to X [mN/20 mm], when the peeling force of the second peeling sheet on the adhesive layer is set to Y [mN/20 mm], the relationship Y-X≧50 is satisfied, and the adhesive layer, the first peeling agent layer and the second peeling agent layer do not substantially contain polysilicone compounds and halogen compounds. In patent document 1, the first peeling sheet, the adhesive layer and the second peeling sheet are of the same size. [Prior art document] [Patent document]

[Patent Document 1] International Publication No. 2009/047984

[The problem the invention is trying to solve]

In patent document 1, after the first peeling sheet is peeled off, the surface of the adhesive layer from which the first peeling sheet is peeled off is adhered to an adherend. Thereafter, the second peeling sheet is further peeled off from the adhesive layer, and the adherend is adhered to another adherend. As described above, the first peeling sheet, the adhesive layer, and the second peeling sheet are of the same size. Therefore, when the first peeling sheet is peeled off, peeling defects such as coagulation damage are easily generated in the adhesive layer at the end of the peeling, and it is necessary to improve it. Furthermore, it is also desirable to prevent peeling defects such as peeling from occurring at the interface of each layer during operation. The purpose of the present invention is to provide a laminated sheet material that can suppress peeling defects when peeling off useless parts and during operation. [Technical means to solve the problem]

The inventors of the present invention have conducted intensive research and found that the above-mentioned problem can be solved by the following structure. (1) A laminated sheet, wherein a first resin substrate, an intermediate layer, and a second resin substrate are laminated in sequence, wherein the first resin substrate and the intermediate layer are of the same shape and size and are laminated to form a laminated portion, wherein the first resin substrate is a quadrilateral when viewed from the normal direction of the surface of the first resin substrate, and the second resin substrate is larger in area than the first resin substrate and the intermediate layer, and wherein, when viewed from the normal direction of the surface of the first resin substrate, a corner portion including a vertex where a first side and a second side of the first resin substrate intersect orthogonally has a protrusion protruding from the first side, the vertex, and the outer edge of the second side, and the length of the protrusion protruding from the first side in a first direction orthogonal to the first side is 5 mm to 20 mm, the length of the protrusion in the direction parallel to the first side from the intersection of the protrusion and the first side is 10 mm to 40 mm, the length of the protrusion from the second side in the second direction perpendicular to the second side is 5 mm to 20 mm, and the length of the protrusion in the direction parallel to the second side from the intersection of the protrusion and the second side is 10 mm to 40 mm. (2) The laminated sheet as described in (1), wherein an intermediate layer which is arranged off the ground from the laminated portion and different from the intermediate layer and a first resin substrate which is different from the first resin substrate are laminated in sequence on the protrusion of the second resin substrate.

(3) A laminated sheet as described in (1) or (2), wherein the outline of the shape of the protrusion observed from the normal direction of the surface of the first resin substrate is composed of at least one of a straight line and a curved line. (4) A laminated sheet as described in any one of (1) to (3), wherein the outline of the protrusion observed from the normal direction of the surface of the first resin substrate is a polygon, a sector or an elliptical sector. (5) A laminated sheet as described in any one of (1) to (4), wherein the intermediate layer is a polysilicone resin layer. (6) A laminated sheet as described in any one of (1) to (5), wherein the first resin substrate and the second resin substrate are polyethylene terephthalate substrates. [Effect of the invention]

According to the present invention, a laminated sheet can be provided in which peeling defects are suppressed when peeling off unnecessary portions and during operation.

Hereinafter, the embodiments of the present invention will be described with reference to the drawings. The embodiments below are exemplary embodiments for illustrating the present invention, and the present invention is not limited to the embodiments shown below. Furthermore, various changes and substitutions may be added to the embodiments below without departing from the scope of the present invention. Hereinafter, the numerical range indicated by "～" means a range including the numerical values recorded before and after "～" as the lower limit and the upper limit. In addition, below, "orthogonal" and "parallel" generally include the allowable error range unless otherwise specified.

As a characteristic point of the laminated sheet of the present invention, it is found that when the second resin substrate is peeled off as an unnecessary portion, peeling defects can be suppressed by the laminated sheet, wherein the laminated sheet is laminated with a first resin substrate, an intermediate layer, and a second resin substrate in sequence, and the first resin substrate and the intermediate layer are of the same shape and size and are laminated to form a laminated portion, and a normal line of the first resin substrate from the surface of the first resin substrate is The shape observed in the direction is a quadrilateral, the second resin substrate has an area larger than the first resin substrate and the intermediate layer, and when observed in the normal direction of the surface of the first resin substrate, at a corner including the vertex where the first side and the second side of the first resin substrate intersect orthogonally, there is a protrusion protruding from the first side, the vertex and the outer edge of the second side, the length of the protrusion protruding from the first side in a first direction orthogonal to the first side is 5 mm to 20 mm, the length of the protrusion in a direction parallel to the first side from the intersection of the protrusion and the first side is 10 mm to 40 mm, the length of the protrusion in a second direction orthogonal to the second side from the second side is 5 mm to 20 mm, and the length of the protrusion in a direction parallel to the second side from the intersection of the protrusion and the second side is 10 mm to 40 mm. In this way, the desired effect can be obtained.

<First Example of Laminated Sheet> FIG. 1 is a schematic top view of the first example of the laminated sheet of the embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the first example of the laminated sheet of the embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1 . FIG. 1 is a schematic top view observed from the normal direction of the surface 12a of the first resin substrate 12. The laminated sheet 10 of the first example shown in FIG. 1 is sequentially laminated with a first resin substrate 12, an intermediate layer 14, and a second resin substrate 16 as shown in FIG. 2 . The laminated sheet 10 has an intermediate layer 14 disposed on the surface 16a of the second resin substrate 16, and a first resin substrate 12 disposed on the surface 14a of the intermediate layer 14. The first resin substrate 12 and the intermediate layer 14 have the same shape and size and are laminated to form a laminated portion 15.

As shown in FIG. 1 , the first resin substrate 12 has a quadrilateral shape when viewed from the normal direction of the surface 12a of the first resin substrate 12. The second resin substrate 16 has a larger area than the first resin substrate 12 and the intermediate layer 14. And when the second resin substrate 16 is viewed from the normal direction of the surface 12a of the first resin substrate 12, the corner 12e of the second resin substrate 16 including the vertex 13e where the first side 13a and the second side 13b of the first resin substrate 12 intersect orthogonally has a protrusion 18 protruding from the outer edge of the first side 13a, the vertex 13e and the second side 13b. That is, the second resin substrate 16 has a larger area than the laminated portion 15.

In the laminated sheet 10, as shown in FIG1, the first resin substrate 12 has a first side 13a, a second side 13b, a third side 13c and a fourth side 13d. The first side 13a and the third side 13c are of the same length and parallel. The second side 13b and the fourth side 13d are of the same length and parallel. The first side 13a and the second side 13b are orthogonal. Moreover, the third side 13c and the fourth side 13d are orthogonal. In the laminated portion 15 shown in FIG1, the length _L1 of the first side 13a and the third side 13c is shorter than the length _L2 of the second side 13b and the fourth side 13d. Furthermore, in the laminated portion 15, the length _L1 of the first side 13a and the third side 13c may be longer than the length _L2 of the second side 13b and the fourth side 13d, and the length L1 of the first side 13a and the third side 13c may be the same as the length _L2 of the second side 13b and _the fourth side 13d. When the length _L1 of the first side 13a and the third side 13c is the same as the length _L2 of the second side 13b and the fourth side 13d, the outer shape observed from the normal direction of the surface 12a of the first resin substrate 12 is a square.

As shown in FIG2 , the laminated sheet 10 is a structure in which nothing is formed on the surface 18a of the protrusion 18 of the second resin substrate 16. The shape of the protrusion 18 observed from the normal direction of the surface 12a of the first resin substrate 12 is, for example, a shape formed by combining two quadrilaterals as shown in FIG1 . The shape of the protrusion 18 observed from the normal direction of the surface 12a of the first resin substrate 12 is an L shape as shown in FIG1 . The vertex of the protrusion 18 where the side parallel to the first side 13a and the side parallel to the second side 13b intersect orthogonally is set as 18e.

The length d1 of the protrusion 18 protruding from the first side 13a in the first direction _D1 orthogonal to the first side _13a is 5 mm to 20 mm, and the length d2 of the protrusion 18 from the intersection M1 of the protrusion 18 and the first side 13a in the direction parallel to the first side 13a is ₁₀ mm to 40 mm. The length _d3 of the protrusion 18 protruding from the second side 13b in the second direction _D2 orthogonal to the second side 13b is ₅ mm to 20 mm, and the length _d4 of the protrusion 18 from the intersection _M2 of the protrusion 18 and the second side 13b in the direction parallel to the second side 13b is 10 mm to 40 mm. Furthermore, the direction parallel to the first side 13a is the second direction _D2 , and the direction parallel to the second side 13b is the first direction _D1 . The protruding length _d1 of the protruding portion 18 and the protruding length _d3 of the protruding portion 18 are preferably 5 mm to 10 mm. The length _d2 of the protruding portion 18 in a direction parallel to the first side 13a and the length _d4 of the protruding portion 18 in a direction parallel to the second side 13b are preferably 20 mm to 30 mm. The protruding length _d1 of the protrusion 18, the length _d2 of the protrusion 18 in a direction parallel to the first side 13a, the protruding length _d3 of the protrusion 18, and the length d4 of the protrusion 18 in a direction parallel to the second side 13b are respectively average values of distances at any ₁₀ locations that are equivalent to the protruding length _d1 of the protrusion 18, the length _d2 of the protrusion 18 in a direction parallel to the first side 13a, the protruding length _d3 of the protrusion 18, and the length _d4 of the protrusion 18 in a direction parallel to the second side 13b.

As long as the protruding length _d1 of the protruding portion 18, the protruding length _d2 of the protruding portion 18 in the direction parallel to the first side 13a, the protruding length _d3 of the protruding portion 18, and the protruding length _d4 of the protruding portion 18 in the direction parallel to the second side 13b are within the above range, the shape thereof is not particularly limited, and it is preferably a shape that takes into consideration the processability such as easy processing. The outline of the shape of the protruding portion 18 observed from the normal direction of the surface 12a of the first resin substrate 12 may be composed of at least one of a straight line and a curved line. Furthermore, the number of straight lines and curved lines constituting the outline is not particularly limited, and may be one or more. Moreover, the shape of the protruding portion 18 observed from the normal direction of the surface 12a of the first resin substrate 12 is, for example, a polygon, a sector, or an elliptical sector.

In the protrusion 18, by the protrusion length _d1 of the protrusion 18, the protrusion length _d2 of the protrusion 18 in the direction parallel to the first side 13a, the protrusion length _d3 of the protrusion 18, and the protrusion length _d4 of the protrusion 18 in the direction parallel to the second side 13b respectively satisfying the above ranges, the generation of peeling defects such as cohesion damage can be suppressed, and the peeling of the laminated sheet can be suppressed during the operation of conveying the laminated sheet. Furthermore, when the protruding length _d1 of the protruding portion 18, the protruding length _d2 of the protruding portion 18 in the direction parallel to the first side 13a, the protruding length _d3 of the protruding portion 18, and the protruding length d4 of the protruding portion 18 in the direction parallel to the second side _13b exceed the upper limit values, the laminated sheet may be accidentally peeled off during the operation of conveying the laminated sheet, and as a result, peeling defects such as cohesion damage may occur. Moreover, when the protruding length _d1 of the protruding portion 18, the protruding length _d2 of the protruding portion 18 in the direction parallel to the first side 13a, the protruding length _d3 of the protruding portion 18, and the protruding length _d4 of the protruding portion 18 in the direction parallel to the second side 13b do not reach the lower limit values, peeling defects such as cohesion damage may occur.

In the laminated sheet 10, by providing the above-mentioned protrusion 18 on the second resin substrate 16, when the second resin substrate 16 is peeled off, for example, from the corner 12e at the diagonal position of the corner 12e with the protrusion 18 in the direction Dp toward the corner 12e with the protrusion 18, the corner 12e with the protrusion 18 does not become the peeling end portion. Therefore, it is possible to suppress the generation of peeling defects such as coagulation damage at the corner 12e with the protrusion 18. Due to coagulation damage, the intermediate layer 14 will fall off, and the fallen intermediate layer 14 will cause contamination in the step, but this situation can also be suppressed. That is, contamination in the step can also be suppressed.

<Second to fourth examples of laminated sheets> Fig. 3 is a schematic top view of the second example of the laminated sheet of the embodiment of the present invention, and Fig. 4 is a schematic cross-sectional view of the second example of the laminated sheet of the embodiment of the present invention. Fig. 5 is a schematic top view of the third example of the laminated sheet of the embodiment of the present invention. Fig. 6 is a schematic top view of the fourth example of the laminated sheet of the embodiment of the present invention. Figs. 3, 5 and 6 are schematic top views observed from the normal direction of the surface 12a of the first resin substrate 12. Fig. 4 is a schematic cross-sectional view obtained from the B-B line of Fig. 3. Furthermore, in FIGS. 3 to 6 , the same symbols are used for the components that are the same as those of the laminated sheet 10 shown in FIGS. 1 and 2 , and their detailed descriptions are omitted.

Compared with the laminated sheet 10 shown in Figs. 1 and 2, the laminated sheet 11 of the second example shown in Fig. 3 is different in that an intermediate layer 19a which is arranged separately from the laminated portion 15 and different from the intermediate layer 14 and a first resin substrate 19b which is different from the first resin substrate 12 are sequentially laminated on the surface 18a of the protruding portion 18 of the second resin substrate 16 as shown in Fig. 4, but the other structures are the same as the laminated sheet 10 shown in Figs. 1 and 2. The laminated body 19 includes a different intermediate layer 19a and a different first resin substrate 19b.

In the laminated sheet 11 shown in FIG. 3 , the laminated portion 15 and the laminated body 19 are separated by the cutting line 17. That is, the different intermediate layers 19a and the different first resin substrates 19b are separated from the laminated portion 15 by the cutting line 17. As shown in FIG. 4 , the cutting line 17 passes through the first resin substrate 12 and the intermediate layer 14 and reaches the middle of the thickness direction of the second resin substrate 16. The cutting line 17 fully cuts the first resin substrate 12 and the intermediate layer 14 and half cuts the second resin substrate 16. The different intermediate layer 19a is separated from the intermediate layer 14 by the cutting line 17, and thus may be the same as the intermediate layer 14, or may be different from the intermediate layer 14. Furthermore, the different first resin substrate 19b is separated from the first resin substrate 12 by the cutting line 17, and thus may be the same as the first resin substrate 12, or may be different from the first resin substrate 12. In the laminate sheet 11, when the second resin substrate 16 is peeled off, the laminate 19 on the surface 18a of the protrusion 18 is peeled off before the second resin substrate 16 is peeled off. If the laminated body 19 is peeled off, the laminated sheet 10 shown in FIG. 1 and FIG. 2 is obtained. After the laminated body 19 is peeled off, the second resin substrate 16 is peeled off in the same manner as the laminated sheet 10 shown in FIG. 1 and FIG. 2. In the laminated sheet 11, as in the laminated sheet 10 shown in FIG. 1 and FIG. 2, the generation of peeling defects such as cohesion damage can be suppressed, and contamination in the step can also be suppressed.

Compared with the laminated sheet 10 shown in FIGS. 1 and 2 , the laminated sheet 11a of the third example shown in FIG. 5 is different in that the protrusion 18 of the second resin substrate 16 has a sector shape when viewed from the normal direction of the surface 12a of the first resin substrate 12, but the other configurations are the same as the laminated sheet 10 shown in FIGS. 1 and 2 . The above-mentioned external shape of the protrusion 18 is a sector shape with a radius r centered at the vertex 13e of the first resin substrate 12. The protrusion 18 surrounds a corner 12e including the vertex 13e where the first side 13a and the second side 13b intersect orthogonally. The maximum length _d5 passing through the center of the sector shape is twice the radius r. In the laminated sheet 11a, the maximum length _d5 is not less than 10 mm and not more than 40 mm. The radius r is equal to the length _d1 of the protrusion 18 in the first direction _D1 and the length _d3 of the protrusion 18 in the second direction _D2 . The maximum length _d5 of the protrusion 18 is equal to the length d2 of the protrusion 18 in the direction parallel to the first side 13a and the length _d4 of the protrusion 18 in the direction parallel to the second side 13b. Furthermore, the maximum length _d5 of the protrusion 18 is not less than 10 mm and not more than 40 mm, so the radius r is not less than 5 mm and not more than 20 mm. In the laminated sheet 11a, the protrusion 18 has a sector _shape , but may also be an elliptical sector shape.

Compared with the laminated sheet 10 shown in Figures 1 and 2, the laminated sheet 11b of the fourth example shown in Figure 6 is different in the shape of the protrusion 18 of the second resin substrate 16 observed from the normal direction of the surface 12a of the first resin substrate 12. Other than this, the structure is the same as the laminated sheet 10 shown in Figures 1 and 2. The outer shape of the protrusion 18 of the laminated sheet 11b is a profile having an arc-shaped curve 20a extending from the first side 13a, a straight line 20b connected to the curve 20a and parallel to the first side 13a, an arc-shaped curve 20c extending from the second side 13b, and a straight line 20d connected to the curve 20c and parallel to the second side 13b, and the straight line 20b parallel to the first side 13a and the straight line 20d perpendicular to the first side 13a are connected. The arc-shaped curve 20a and the arc-shaped curve 20c are the same length. Moreover, the straight line 20b and the straight line 20d are the same length. The distance between the first side 13a and the straight line 20b in the first direction _D1 is the protruding length _d1 of the protrusion 18. The distance from the intersection point _M1 of the curve 20a of the protrusion 18 and the first side 13a to the intersection point 20e of the straight line 20b and the straight line 20d in the direction parallel to the first side 13a is the length _d2 of the protrusion 18. The distance between the second side 13b and the straight line 20d in the second direction _D2 is the protrusion length _d3 of the protrusion 18. The distance from the intersection point _M2 of the curve 20c and the second side 13b to the intersection point 20e in the direction parallel to the second side 13b is the length _d4 of the protrusion 18.

In the laminated sheet 11a shown in FIG. 5 and the laminated sheet 11b of the fourth example shown in FIG. 6, the second resin substrate 16 is peeled off in the same manner as the laminated sheet 10 shown in FIG. 1 and FIG. 2. In this case, as in the laminated sheet 10 shown in FIG. 1 and FIG. 2, the generation of peeling defects such as cohesion damage can be suppressed, and contamination in the step can also be suppressed. In addition, in the laminated sheet 11a shown in FIG. 5 and the laminated sheet 11b of the fourth example shown in FIG. 6 , the laminated sheet 11 shown in FIG. 4 may also be configured as follows: a laminated body 19 is provided on the surface 18a of the protruding portion 18, and the laminated body 19 sequentially laminates different intermediate layers 19a and different first resin substrates 19b.

<Laminated sheet peeling method> FIG. 7 is a schematic top view showing the first example of the laminated sheet peeling method of the embodiment of the present invention, and FIG. 8 is a schematic cross-sectional view showing the first example of the laminated sheet peeling method of the embodiment of the present invention. FIG. 8 is a schematic cross-sectional view obtained along the C-C line of FIG. 7 . In the laminated sheet peeling method, the second resin substrate 16 is peeled from the diagonal direction of the protrusion 18 toward the protrusion 18. As shown in FIG. 7 and FIG. 8 , the surface 12a of the first resin substrate 12 is directed toward the surface 30a of the adsorption platform 30, and the laminated sheet 10 is placed on the surface 30a of the adsorption platform 30. Then, the adsorption platform 30 sucks the laminated sheet 10 to fix the laminated sheet 10. At this time, a mask 32 is provided between the protrusion 18 and the adsorption platform 30. The mask 32 can suppress the contact between the protrusion 18 and the adsorption platform 30.

The mask 32 may be formed by, for example, an adhesive tape. By using the adhesive tape, the mask can be arranged at a position corresponding to the shape of the laminated sheet. In addition to the adhesive tape, the mask 32 may be formed by, for example, cutting a PET film or the like into a size slightly larger than the laminated sheet 10. The PET film or the like is placed on the adsorption table 30 as the mask 32. Alternatively, the mask 32 may not be provided, and, for example, the adsorption hole pattern of the adsorption table 30 may be made the same as that of the laminated sheet 10. Alternatively, the adsorption holes used when the laminated sheet 10 is adsorbed by the adsorption table 30 may be appropriately used in accordance with the shape of the laminated sheet 10. The distance d _m between the mask 32 and the laminated portion 15 is preferably greater than 0 mm and less than 5 mm, and the upper limit is more preferably less than 2 mm. The distance _dm is the average value of the distances at any 10 points that are equivalent to the distance _dm . Furthermore, when the distance _dm exceeds 5 mm, the entire laminated sheet 10 may be displaced when the second resin substrate 16 is peeled off. Also, when the second resin substrate 16 is peeled off, leakage may become larger, and the laminated sheet 10 may not be sufficiently sucked and fixed. As a result, when the laminated sheet 10 is curled or the rigidity of the laminated sheet 10 is low, the laminated sheet 10 is wrinkled or curled, and a defect occurs when it is attached to the glass substrate.

The thickness _tm of the mask 32 is, for example, the same as the thickness of the laminated portion 15. Therefore, the thickness _tm of the mask 32 is determined by the thickness of the first resin substrate 12 and the intermediate layer 14. If the thickness _tm of the mask 32 is thick, peeling may occur at the interface between the intermediate layer 14 and the second resin substrate 16 when the laminated sheet 10 is sucked, resulting in peeling defects. If peeling defects occur, particles adhere to the peeled portion, resulting in bonding defects. Furthermore, when the distance _dm and the thickness _tm of the mask 32 are appropriate, the second resin substrate 16 and the intermediate layer 14 will not be accidentally peeled off, and when the second resin substrate 16 is intentionally peeled off, the laminated sheet 10 can be peeled off without deviation. Therefore, there is no peeling defect, the positioning accuracy is also good, and it can be attached to the glass substrate. The thickness _tm of the mask 32 is obtained by measuring the thickness of the mask 32 at more than 5 arbitrary positions using a contact-type film thickness measuring device and taking the arithmetic average thereof.

Next, the second resin substrate 16 is peeled off from the corner 12e of the first resin substrate 12 on the side of the protrusion 18 and at the diagonal corner 12e. At this time, the corner 12e on the side of the protrusion 18 becomes the peeling end portion. In the area of the back surface 14b of the intermediate layer 14 corresponding to the peeling end portion, no peeling defects such as coagulation damage will occur. The intermediate layer 14 has no peeling defects. After the second resin substrate 16 is peeled off, the exposed back surface 14b of the intermediate layer 14 is bonded to the glass substrate 22. At this time, since the intermediate layer 14 has no peeling defects, there will be no poor bonding after bonding to the glass substrate 22. Furthermore, peeling defects are regarded as poor bonding when the glass is bonded.

Here, FIG. 10 and FIG. 11 are schematic top views showing a method of peeling off the second resin substrate of the previous laminated sheet in step order. Furthermore, in FIG. 10 and FIG. 11, the same symbols are given to the same components as the laminated sheet 10 shown in FIG. 1 and FIG. 2, and their detailed description is omitted. As shown in FIG. 10, the previous laminated sheet 100 is a structure without a protrusion 18, and its outer shape is a quadrilateral. The first resin substrate 12 (not shown) is directed toward the surface 30a of the adsorption platform 30, and the previous laminated sheet 100 is placed on the surface 30a of the adsorption platform 30. Then, the adsorption platform 30 sucks the previous laminated sheet 100 and fixes the previous laminated sheet 100. In this fixed state, in the previous laminated sheet 100, the second resin substrate 16 is peeled from the corner 100e in the direction toward the diagonal corner 100f. The corner 100f is the peeling end portion. After peeling, a peeling defect 102 caused by cohesion damage occurs at the corner 14e of the back surface 14b of the intermediate layer 14 corresponding to the peeling end portion. When the intermediate layer 14 with the peeling defect 102 is bonded to the glass substrate 22 shown in FIG. 9, the peeling defect 102 is regarded as poor bonding.

(Another example of laminated sheet) Figures 12 to 14 are schematic top views and cross-sectional views showing an example of a manufacturing method of another example of laminated sheet in order of steps. Figures 15 and 16 are schematic cross-sectional views showing another example of a manufacturing method of another example of laminated sheet in order of steps. Figure 17 is a schematic cross-sectional view showing a method of peeling off the second resin substrate of another example of laminated sheet. In addition, in Figures 12 to 17, the same symbols are assigned to the same components as those of the laminated sheet 10 shown in Figures 1 and 2, and their detailed descriptions are omitted. As shown in FIG. 12 and FIG. 13, a laminate material 40 is prepared in which the second resin substrate 16, the intermediate layer 14, and the first resin substrate 12 are laminated in sequence. In the laminate material 40, the intermediate layer 14 is formed on the back surface 12b of the first resin substrate 12 by, for example, rotary coating or die nozzle coating. Next, the second resin substrate 16 is bonded to the back surface 14b of the intermediate layer 14. The intermediate layer 14 may be formed in a single-piece manner or in a roll-to-roll manner. Next, from the side of the first resin substrate 12 of the laminate material 40, the cutting line 17 is formed into a quadrilateral frame shape. The area 41 surrounded by the cutting line 17 becomes the product, and the area 42 outside the cutting line 17 is a useless part. The area 42 outside the cutting line 17 is removed as a useless part. As shown in FIG. 13, the cutting line 17 passes through the first resin substrate 12 and the intermediate layer 14, and does not reach the second resin substrate 16. The cutting line 17 fully cuts the first resin substrate 12 and the intermediate layer 14. The cutting line 17 can be formed, for example, by laser or punching. The width δ of the cutting line 17 is preferably greater than 10 mm and less than 20 mm. If the width δ of the cutting line 17 is greater than 10 mm and less than 20 mm, the occurrence of the above-mentioned peeling defects can be suppressed, and the first resin substrate 12 or the second resin substrate 16 can also be suppressed from accidentally peeling off during operation.

Next, as shown in FIG. 14, the area 42 outside the cutting line 17 is removed (see FIG. 13), and a laminated sheet 44 is obtained. The first resin substrate 12 and the intermediate layer 14 of the laminated sheet 44 are of the same size and have a quadrilateral shape. The second resin substrate 16 is larger than the first resin substrate 12 and the intermediate layer 14 and has a quadrilateral shape. The first resin substrate 12, the intermediate layer 14, and the second resin substrate 16 are arranged so that the sides are parallel to each other. In addition, in the laminated sheet 44, a portion of the surface 16a of the second resin substrate 16 is exposed. In the laminated sheet 44, the second resin substrate 16 is peeled off, and the glass substrate 22 is bonded to the back surface 14b of the exposed intermediate layer 14 as shown in FIG. 9.

Furthermore, as shown in FIG. 15 , the middle layer 14 is formed on the back surface 12b of the first resin substrate 12 by using a rotary coating or a die nozzle coating. At this time, the first resin substrate 12 and the middle layer 14 are the same size. Next, as shown in FIG. 16 , the second resin substrate 16 having a larger area than the first resin substrate 12 and the middle layer 14 is bonded to the back surface 14b of the middle layer 14. Thus, a laminated sheet 44 can be obtained. In the laminated sheet 44 shown in FIG. 16 , the second resin substrate 16 is also peeled off, and the glass substrate 22 is bonded to the exposed back surface 14b of the middle layer 14 as shown in FIG. 9 .

When the second resin substrate 16 of the laminated sheet 44 is peeled off, as shown in FIG17, the first resin substrate 12 is directed toward the surface 30a of the adsorption platform 30, and the laminated sheet 44 is placed on the surface 30a of the adsorption platform 30. A mask 32 is arranged between the second resin substrate 16 and the adsorption platform 30. Then, the adsorption platform 30 sucks the laminated sheet 44 to fix the laminated sheet 44. In addition, the arrangement of the mask 32 is the same as the mask 32 shown in FIG8 above, so its detailed description is omitted. In the state where the laminated sheet 44 shown in FIG. 17 is fixed to the adsorption platform 30, the second resin substrate 16 is peeled from one corner (not shown) opposite to the diagonal line (not shown) in the laminated sheet 44 in the direction toward the other corner (not shown). At this time, the other corner is the peeling end portion. The area of the second resin substrate 16 is larger than the first resin substrate 12 and the intermediate layer 14, so the end of the intermediate layer 14 does not become the peeling end end. Therefore, when the second resin substrate 16 is peeled, the generation of the peeling defect 102 shown in FIG. 11 can be suppressed. Furthermore, the fixation of the laminated sheet when peeling off the second resin substrate 16 is not limited to the above-mentioned adsorption platform 30, but can also be an electrostatic suction cup.

The first resin substrate 12, the intermediate layer 14, and the second resin substrate 16 constituting the laminated sheet 10 are described in detail below.

(First resin substrate and second resin substrate) The first resin substrate 12 and the second resin substrate 16 protect the intermediate layer 14 and function as a protective layer, and are also called protective films. In addition, when the first resin substrate 12 and the second resin substrate 16 are attached to the glass substrate, either one is peeled off from the intermediate layer 14. Therefore, the first resin substrate 12 and the second resin substrate 16 that is peeled off from the intermediate layer 14 is also called a release film. As materials constituting the first resin substrate 12 and the second resin substrate 16, for example, polyimide resin, polyester resin (e.g., polyethylene terephthalate, polyethylene naphthalate), polyolefin resin (e.g., polyethylene, polypropylene), polyurethane resin can be cited. Among them, polyester resin is preferred, and polyethylene terephthalate (PET) is more preferred. Therefore, the first resin substrate 12 and the second resin substrate 16 are preferably polyethylene terephthalate substrates.

In order to reduce the influence of the force received from the outside, the thickness of the first resin substrate 12 and the second resin substrate 16 is preferably 20 μm or more, more preferably 30 μm or more, and further preferably 50 μm or more. The upper limit of the thickness of the first resin substrate 12 and the second resin substrate 16 is preferably 500 μm or less, more preferably 300 μm or less, and further preferably 100 μm or less.

(Intermediate layer) The intermediate layer 14 is provided between the first resin substrate 12 and the second resin substrate 16. The intermediate layer 14 is a film used to prevent the polyimide film from being peeled off when a polyimide film (not shown) is disposed on the intermediate layer 14.

The intermediate layer 14 may be an organic layer or an inorganic layer. As materials for the organic layer, for example, acrylic resin, polyolefin resin, polyurethane resin, polyimide resin, polysilicone resin, polyimide polysilicone resin, and fluororesin can be cited. In addition, several types of resins can be mixed to form the intermediate layer 14. As materials for the inorganic layer, for example, oxides, nitrides, oxynitrides, carbides, carbonitrides, silicides, and fluorides can be cited. Examples of oxides (preferably metal oxides), nitrides (preferably metal nitrides), and oxynitrides (preferably metal oxynitrides) include oxides, nitrides, and oxynitrides of one or more elements selected from Si, Hf, Zr, Ta, Ti, Y, Nb, Na, Co, Al, Zn, Pb, Mg, Bi, La, Ce, Pr, Sm, Eu, Gd, Dy, Er, Sr, Sn, In, and Ba. Examples of carbides (preferably metal carbides) and carbonitrides (preferably metal carbonitrides) include carbides, carbonitrides, and carbon oxides of one or more elements selected from Ti, W, Si, Zr, and Nb. As silicide (preferably metal silicide), for example, silicide of one or more elements selected from Mo, W and Cr can be cited. As fluoride (preferably metal fluoride), for example, fluoride of one or more elements selected from Mg, Y, La and Ba can be cited.

The middle layer 14 may also be a plasma polymerized film. When the middle layer 14 is a plasma polymerized film, the material forming the plasma polymerized film may include fluorocarbon monomers such as _CF4 , _CHF3 , _C2F6 , _C3F6 , _C2F2 , _CH3F , _C4F8 , etc. _, carbon hydrogen monomers such as methane, _ethane , propane, ethylene, _propylene , acetylene, benzene, _toluene , hydrogen, _SF6 , etc.

Among them, in terms of heat resistance or peeling properties, the material of the intermediate layer 14 is preferably polysilicone resin, polyimide polysilicone resin, more preferably polysilicone resin, and more preferably polysilicone resin formed by condensation reaction type polysilicone. The following describes in detail the state in which the intermediate layer 14 is a polysilicone resin layer.

Polysilicone resin is a resin containing a specified organic silaneoxy unit, and is usually obtained by curing hardening polysilicone. Hardening polysilicone is classified into addition reaction type polysilicone, condensation reaction type polysilicone, ultraviolet curing type polysilicone, and electron beam curing type polysilicone according to its curing mechanism, but all of them can be used. Among them, condensation reaction type polysilicone is preferred. As the condensation reaction type polysilicone, a hydrolyzable organic silane compound or a mixture thereof (monomer mixture) as a monomer, or a partially hydrolyzed condensate (organic polysiloxane) obtained by subjecting a monomer or a monomer mixture to a partial hydrolysis and condensation reaction can be suitably used. Using this condensation reaction type polysilicone, hydrolysis and condensation reactions (sol-gel reactions) are carried out to form polysilicone resin.

The intermediate layer 14 is preferably formed using a curable composition containing curable polysilicone. The curable composition may also contain a solvent, a platinum catalyst (when an addition reaction type polysilicone is used as the curable polysilicone), a leveler, a metal compound, etc. in addition to the curable polysilicone. Examples of metal elements contained in the metal compound include: 3d transition metals, 4d transition metals, yttrium metals, bismuth (Bi), aluminum (Al), and tin (Sn). The content of the metal compound is not particularly limited and can be adjusted appropriately.

The intermediate layer 14 preferably has a hydroxyl group. A portion of the Si-O-Si bonds of the polysiloxane constituting the intermediate layer 14 are broken to generate a hydroxyl group. In addition, when a condensation-reactive polysiloxane is used, the hydroxyl group thereof can become the hydroxyl group of the intermediate layer 14.

The thickness of the intermediate layer 14 in the normal direction of the surface 12a of the first resin substrate 12 is preferably 50 μm or less, more preferably 30 μm or less, and further preferably 12 μm or less. On the other hand, the thickness of the intermediate layer 14 is preferably more than 1 μm, and more preferably 6 μm or more in terms of better foreign body embedding performance. The above thickness is obtained by measuring the thickness of the intermediate layer 14 at more than 5 arbitrary positions using a contact-type film thickness measuring device and arithmetically averaging them. Furthermore, excellent foreign body embedding performance means that even if there is foreign matter between the intermediate layer 14 and other substrates, the foreign matter can be embedded by the intermediate layer 14. If the embedding property of foreign matter is excellent, it is not easy to generate convex parts caused by foreign matter in the middle layer. When a component for electronic device is formed on the polyimide film, the risk of wire breakage in the component for electronic device caused by the convex parts is suppressed. Furthermore, since the gaps formed when the convex parts are generated are observed as bubbles, the embedding property of foreign matter can be evaluated based on whether bubbles are generated.

Here, for example, a polyimide film is formed on a glass substrate (not shown), and if a high-temperature heat treatment is performed, the polyimide film turns yellow, and thus it is difficult to apply to transparent electronic devices. However, although the mechanism is unknown, by forming the intermediate layer 14 on the glass substrate and forming the polyimide film on the intermediate layer 14, the yellowing of the polyimide film caused by the high-temperature heat treatment can be suppressed.

(Glass substrate) The glass substrate 22 bonded to the intermediate layer 14 is a member that supports and reinforces the first resin substrate 12 and the intermediate layer 14. In addition, the glass substrate 22 functions as a conveying substrate. As the type of glass, preferably alkali-free borosilicate glass, borosilicate glass, sodium calcium glass, high silica glass, and oxide-based glass with other silicon oxides as the main component. As oxide-based glass, preferably, a glass having a silicon oxide content of 40 to 90% by mass calculated as oxide is used. As a glass plate, more specifically, there can be cited a glass plate comprising alkali-free borosilicate glass (a product named "AN100" manufactured by AGC Co., Ltd., and a product named "AN-Wizus" manufactured by AGC Co., Ltd. with a linear expansion coefficient of 38×10 ^-7 /°C). As for the manufacturing method of the glass plate, usually, the glass raw materials are melted and the molten glass is formed into a plate shape to obtain it. Such forming methods can be general ones, for example, there can be cited: floating method, melting method, flow hole down-drawing method. The glass substrate 22 is preferably not soft. Therefore, the thickness of the glass substrate 22 is preferably not less than 0.3 mm, and more preferably not less than 0.5 mm. On the other hand, the thickness of the glass substrate 22 is preferably not more than 1.0 mm. The surface roughness Ra of the glass substrate 22 is preferably less than 0.4 nm, and more preferably less than 0.25 nm. If the surface roughness of the glass substrate 22 is larger, the contact area between the polysilicone resin layer and the surface of the glass substrate increases, water molecules are easy to migrate from the glass substrate to the polysilicone resin layer, and the polyimide resin layer is easy to yellow. Therefore, the surface roughness of the glass substrate 22 is preferably below a certain value.

The shape of the glass substrate 22 when viewed from the normal direction of the surface of the glass substrate 22 is not particularly limited, and may be a quadrilateral or a circle, but is preferably a quadrilateral.

The glass substrate 22 is larger than the intermediate layer 14 and the first resin substrate 12. There is a peripheral area on the surface of the glass substrate 22 where the intermediate layer 14 and the first resin substrate 12 are not arranged, and the surface of the peripheral area of the glass substrate 22 is exposed. The width of the peripheral area of the glass substrate 22 is not particularly limited, preferably 1 mm to 30 mm, and more preferably 3 mm to 10 mm. The width of the peripheral area corresponds to the distance from the outer periphery of the first resin substrate 12 to the outer edge of the glass substrate 22. If the width of the peripheral area of the glass substrate 22 is less than 30 mm, the effective area when forming an electronic device becomes larger, and the manufacturing efficiency of the electronic device is improved. Furthermore, since the width of the peripheral area is greater than 1 mm, when a polyimide film is formed on the intermediate layer 14, the polyimide film is less likely to peel off.

(Application of laminated bodies) Laminated bodies obtained by lamination can be used for various applications, such as the manufacture of electronic components such as panels for display devices, PV (photovoltaic), thin-film secondary batteries, semiconductor wafers with circuits formed on the surface, and receiving sensor panels. In these applications, there are also cases where the laminated body is exposed (for example, for more than 20 minutes) in an atmospheric atmosphere and under high temperature conditions (for example, above 450°C). Panels for display devices include LCD, OLED (Organic Light Emitting Diode), electronic paper, plasma display panels, field emission panels, quantum dot LED (Light Emitting Diode) panels, micro LED display panels, MEMS (Micro Electro Mechanical Systems) shutter panels, etc. The receiving sensor panel includes an electromagnetic wave receiving sensor panel, an X-ray receiving sensor panel, an ultraviolet light receiving sensor panel, a visible light receiving sensor panel, and an infrared light receiving sensor panel. The substrate used for the receiving sensor panel can also be reinforced by a reinforcing sheet such as resin. [Example]

The present invention is specifically described below by way of examples, etc., but the present invention is not limited to such examples. Among the examples 1 to 7 shown below, examples 1 to 5 are examples, and examples 6 and 7 are comparative examples.

[Preparation of laminated sheets] <Preparation of curable polysilicone> Add triethoxymethylsilane (179 g), toluene (300 g), and acetic acid (5 g) to a 1 L (liter) flask, stir the mixture at 25°C for 20 minutes, and then heat it to 60°C and react for 12 hours to obtain a crude reaction solution. Cool the obtained crude reaction solution to 25°C, and then wash it three times with water (300 g). Add trimethylsilyl chloride (70 g) to the washed crude reaction solution, stir the mixture at 25°C for 20 minutes, and then heat it to 50°C and react for 12 hours. The obtained crude reaction liquid was cooled to 25°C and washed three times with water (300 g). Toluene was removed from the washed crude reaction liquid by reduced pressure distillation to obtain a slurry, which was then dried overnight in a vacuum dryer to obtain a curable polysiloxane 1 as a white organic polysiloxane compound. The molar ratio of the M unit to the T unit of the curable polysiloxane 1 was 13:87, the organic groups were all methyl groups, and the average OX group number was 0.02. The M unit means an organic silaneoxy unit represented by (R) ₃ SiO _1/2 , and the T unit means an organic silaneoxy unit represented by RSiO _3/2 . R in each formula represents a hydrogen atom or an organic group. The average OX group number refers to the number of OX groups (X is a hydrogen atom or a hydrocarbon group) bonded to one Si atom on average.

<Preparation of curable composition> Curing polysilicone 1 (20 g), zirconium octanoate compound ("ORGATIX ZC-200", manufactured by Matsumoto Fine Chemical Co., Ltd.) (0.16 g) as a metal compound, 2-ethylhexanoic acid (III) (manufactured by Alfa Aesar, metal content 12% by mass) (0.17 g), and Isoper G (manufactured by Tonen General Sekiyu Co., Ltd.) (19.7 g) as a solvent were mixed, and the obtained mixed solution was filtered using a filter with a pore size of 0.45 μm to obtain curable composition 1.

<Example 1 Laminated sheet> A PET film (Toyobo Ester (registered trademark) HPE, 50 μm thick, manufactured by Toyobo Co., Ltd.) was prepared as a first resin substrate (release film), and the prepared curable composition 1 was applied on the surface of the first resin substrate, and heated at 140°C for 10 minutes using a heating plate to form a silicone resin layer on the first resin substrate (release film). A PET film (Toyobo Ester (registered trademark) HPE, 50 μm thick, manufactured by Toyobo Co., Ltd.) was laminated on the silicone resin layer as a second resin substrate (protective film). Next, a punching machine was used to cut the sheet so that an L-shaped protrusion was formed at one corner of the sheet with a size of 912 (L ₂ ) mm × 722 (L ₁ ) mm. The protrusion was formed so that the length d ₁ of the protrusion in the first direction D ₁ and the length d ₃ of the protrusion in the second direction D ₂ were 10 mm, and the length d ₂ of the protrusion 18 in the direction parallel to the first side 13 a and the length d ₄ of the protrusion 18 in the direction parallel to the second side 13 b were 20 mm. Using a cutter, the PET film and the silicone resin layer (middle layer) serving as the first resin substrate (release film) are fully cut from the PET film side serving as the first resin substrate (release film), and the PET film serving as the second resin substrate (protective film) is half-cut to the middle of its thickness. The cutting method for half-cutting the laminated sheet using a cutter is set to "punching method". In this way, a laminated sheet 1 is obtained in which the first resin substrate (release film), the silicone resin layer (middle layer), and the second resin substrate (protective film) are laminated in this order. The thickness of the obtained laminated sheet 1 is 110 μm. In Example 1, the protrusion has a shape as shown in FIG1. In Table 1 below, the length _d1 of the protrusion in the first direction _D1 and the length d3 of the protrusion in the second direction _D2 are recorded as "lengths _d1 , _d3 of the protrusion". In Table 1 below, the length _d2 of the protrusion 18 in the direction parallel to the first side _13a and the length _d4 of the protrusion 18 in the direction parallel to the second side 13b are recorded as "lengths _d2 , _d4 of the protrusion".

<Examples 2 to 7> Laminated sheets were obtained in the same order as in Example 1 above, except that the laminated sheets were cut in such a manner that the dimensions of the laminated sheets, the shape and dimensions of the protruding portion of the laminated sheets, and the half-cutting method of the laminated sheets became the relationships of Examples 2 to 8 shown in Table 1 below. In addition, in the case of "-" in Table 1 below, it means that there is no compliance. In Example 2, the protruding portion has the shape shown in Figure 1. In Example 2, a laser processing machine was used instead of a punching machine to form an L-shaped protruding portion at one corner of the size of 912 ( _L2 ) mm × 722 ( _L1 ) mm. The protrusions were formed so that the length _d1 of the protrusion in the first direction _D1 and the length _d3 of the protrusion in the second direction _D2 were 10 mm, and the length _d2 of the protrusion 18 in the direction parallel to the first side 13a and the length _d4 of the protrusion 18 in the direction parallel to the second side 13b were 20 mm. The PET film as the first resin substrate (release film) and the silicone resin layer (intermediate layer) were fully cut from the PET film side of the first resin substrate (release film) using a laser processing machine, and the PET film as the second resin substrate (protective film) was half-cut to the middle of its thickness. The cutting method of half-cutting the laminated sheet using the laser processing machine was set to "laser method". The laser processing machine uses a CO ₂ linear motion plotter laser.

In Example 3, the protrusion is in the shape shown in FIG. 1. In Example 3, the laminated sheet 1 is cut by a laser processing machine so that an L-shaped protrusion is formed at one corner of the sheet with a size of 912 (L ₂ ) mm × 722 (L ₁ ) mm. The protrusion is formed so that the length d ₁ of the protrusion in the first direction D ₁ and the length d ₃ of the protrusion in the second direction D ₂ are 20 mm, and the length d ₂ of the protrusion 18 in the direction parallel to the first side 13 a and the length d ₄ of the protrusion 18 in the direction parallel to the second side 13 b are 40 mm. In Example 4, the protrusion is in the shape shown in FIG. 5. In Example 4, the laminated sheet 1 was cut using a laser processing machine so as to form a fan-shaped protrusion at one corner of the sheet having a size of 912 (L ₂ ) mm×722 (L ₁ ) mm. The protrusion was formed so that the maximum length d ₅ shown in FIG. 5 was 20 mm.

In Example 5, the protrusion is in the shape shown in FIG6. Regarding Example 5, "-" is written in the column of "Protrusion shape" in Table 1 below. In Example 5, the laminated sheet 1 was cut using a laser processing machine so that a protrusion of the shape shown in FIG6 was formed at one corner of the size ₉₁₂ ( _L2 ) mm × 722 ( _L1 ) mm. The protrusion was formed so that the length _d1 of the protrusion in the first direction D1 and the length _d3 of the protrusion in the second direction _D2 were 5 mm, and the length _d2 of the protrusion 18 in the direction parallel to the first side 13a and the length _d4 of the protrusion 18 in the direction parallel to the second side 13b were 20 mm.

Example 6 is a structure without a protrusion. In Example 6, a laser processing machine is used to cut the laminated sheet 1 into a size of 912 (L ₂ ) mm × 722 (L ₁ ) mm. In addition, regarding Example 6, "-" is recorded in the column of "Outer shape of protrusion" in the following Table 1. In Example 7, the protrusion is the shape shown in Figure 1. In Example 7, a laser processing machine is used to cut the laminated sheet 1 in a manner such that an L-shaped protrusion is formed at one corner of the size of 912 (L ₂ ) mm × 722 (L ₁ ) mm. The protrusion is formed so that the length _d1 of the protrusion in the first direction _D1 and the length _d3 of the protrusion in the second direction _D2 are 25 mm, and the length _d2 of the protrusion 18 in the direction parallel to the first side 13a and the length _d4 of the protrusion 18 in the direction parallel to the second side 13b are 50 mm.

<Peeling of the PET film and the silicone resin layer as the release film on the protruding portion> In Examples 1 to 5 and Example 7, the laminated sheet 1 was placed on the adsorption table with the PET film as the release film on top, and an invisible tape (Scotch, CM-12 manufactured by 3M) was attached to the protruding portion of the laminated sheet 1. Thereafter, the invisible tape was pulled by hand to peel off the PET film and the silicone resin layer as the release film.

<Evaluation of operability> Hold the short side of the laminated sheet 1 from which the PET film and the silicone resin layer as the release film have been peeled off with both hands, pick it up from the table, and place it on the table, and observe the corner of the laminated sheet 1 under a fluorescent light. Based on the observation results, the peeling defect is evaluated according to the following evaluation criteria. The results are shown in Table 1 below. A: No peeling defect is visible at the corner of the laminated sheet 1. B: Peeling defect is visible at the corner of the laminated sheet 1.

<Peeling off the PET film as a protective film> The silicone film adhesive tape (626001-NB-20-50X50 manufactured by Japan Maxim Co., Ltd.) was attached to the surface of the nylon grid of the precision single-sheet bonding machine (SE1208aa manufactured by Climb Products Co., Ltd.) in a manner that the 916 mm×726 mm in the center of the nylon grid was left empty and the outer periphery was covered with the adhesive tape. The laminated sheet 1 from which the PET film as a release film and the silicone resin layer were peeled off was placed on the inner side of the 916 mm×726 mm that was not covered by the grid in a manner that the PET film as a release film was connected, and the nylon grid was sucked to fix the laminated sheet 1. In Examples 1 to 5 and 7, invisible tape (Scotch, CM-12 manufactured by 3M) was attached to the PET film as a protective film located at the corner opposite to the protrusion of the laminated sheet 1, and peeled off in the direction of the protrusion. In Example 6, invisible tape was attached to any corner of the laminated sheet 1, and the PET film as a protective film was peeled off.

<Evaluation of peeling defects> The PET film serving as the second resin substrate (protective film) was peeled off from the laminated sheet, and the peeling end portion of the second resin substrate (protective film) was observed under a fluorescent lamp. Based on the observation results, the peeling defects were evaluated according to the following evaluation criteria. The results of the peeling defects are shown in Table 1 below. Peeling defects refer to defects that occur in the silicone resin layer (intermediate layer) without peeling at the interface between the silicone resin layer (intermediate layer) and the second resin substrate (protective film), but are caused by damage inside the silicone resin layer (intermediate layer). When peeling the second resin substrate (protective film), if the peeling defect occurs, the silicone resin layer (intermediate layer) is attached to the surface of the second resin substrate (protective film). The peeling defect (attached silicone resin layer (intermediate layer)) is visually observed under a fluorescent light. Evaluation criteria A: No peeling defect is visually observed at the peeling end of the second resin substrate (protective film). B: A peeling defect is visually observed at the peeling end of the second resin substrate (protective film).

<Production of laminated body> A 920 mm × 730 mm, 0.5 mm thick glass substrate "AN Wizus" (support substrate, Young's modulus 85 GPa) was cleaned with a water-based glass cleaner ("PK-LCG213" manufactured by Parker Corporation) and then cleaned with pure water, and the PET film as a protective film was peeled off from the laminated sheet 1 from which the PET film as a release film and the polysilicone resin layer were peeled off. The laminated sheet was then laminated using a precision single-sheet laminating machine (Climb SE1208aa manufactured by Products Co., Ltd.) The PET film as a release film formed with a silicone resin layer of the laminated sheet 1 is bonded to a glass substrate to produce a laminated body having a glass substrate, a silicone resin layer and a PET film arranged in sequence. In Examples 6 and 7 where peeling defects were observed in the laminated sheet 1 during the evaluation of operability or peeling defects, defects of non-bonding between the silicone resin and the glass substrate were also observed at the same position in the laminated body.

[Table 1] Dimensions of laminated sheets (L ₂ × L ₁ mm) Half-cutting method for laminated sheets Shape of protrusion Protruding length d ₁ , d ₃ (mm) Length of protrusion d ₂ , d ₄ (mm) Maximum length of protrusion d ₅ (mm) Operational Assessment Peel-off Assessment Example 1 912×722 Punching method The L Word 10 20 - A A Example 2 912×722 Laser method The L Word 10 20 - A A Example 3 912×722 Laser method The L Word 20 40 - A A Example 4 912×722 Laser method sector - - 20 A A Example 5 912×722 Laser method - 5 20 - A A Example 6 912×722 Laser method - - - - A B Example 7 912×722 Laser method The L Word 25 50 - B B

According to the comparison of Examples 1 to 7 shown in Table 1, compared with Examples 6 and 7, Examples 1 to 5 had no peeling defects and the peeling evaluation was good. Example 6 had a structure without a protrusion and had peeling defects. The protrusion of Example 7 was larger and the operability was poor. Furthermore, in Examples 6 and 7 where peeling defects were observed in the laminated sheet 1 in the evaluation of operability or the evaluation of peeling defects as described above, defects of non-bonding of the silicone resin and the glass substrate were also observed at the same position in the laminate.

The present invention has been described in detail and with reference to specific embodiments, but it is obvious to those skilled in the art that various modifications or changes may be made without departing from the spirit and scope of the present invention. This application is based on Japanese Patent Application No. 2022-185672 filed on November 21, 2022, the contents of which are incorporated herein by reference.

10,11,11a,11b,44,100: laminated sheet 12: first resin substrate 12a,14a,16a,18a,30a: surface 12b,14b: back surface 12e,14e,100e,100f: corner 13a: first side 13b: second side 13c: third side 13d: fourth side 13e: vertex 14: middle layer 15: Lamination 16: Second resin substrate 17: Cutting line 18: Protrusion 18e: Vertex 19: Lamination 19a: Different intermediate layer 19b: Different first resin substrate 20a: Curve 20b: Straight line 20c: Curve 20d: Straight line 20e: Intersection 22: Glass substrate 30: Adsorption platform 32: Mask 40: Lamination material 41, 42: Area 102: Peeling defect D ₁ : 1st direction D ₂ : 2nd direction Dp: Directions d ₁ , d ₃ : Length of protrusion d ₂ : Length of protrusion in the direction parallel to the 1st side d ₄ : Length of protrusion in the direction parallel to the 2nd side d ₅ : Maximum length d _m : Distance L ₁ : Length L ₂ : Length M ₁ , M ₂ : Intersection point r: Radius t _m : Thickness δ: Width

FIG. 1 is a schematic top view showing the first example of the laminated sheet material of the embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing the first example of the laminated sheet material of the embodiment of the present invention. FIG. 3 is a schematic top view showing the second example of the laminated sheet material of the embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing the second example of the laminated sheet material of the embodiment of the present invention. FIG. 5 is a schematic top view showing the third example of the laminated sheet material of the embodiment of the present invention. FIG. 6 is a schematic top view showing the fourth example of the laminated sheet material of the embodiment of the present invention. FIG. 7 is a schematic top view showing the peeling method of the first example of the laminated sheet material of the embodiment of the present invention. FIG8 is a schematic cross-sectional view showing a peeling method of the first example of the laminated sheet of the embodiment of the present invention. FIG9 is a schematic cross-sectional view showing a state in which the second resin substrate of the first example of the laminated sheet of the embodiment of the present invention is peeled off and then bonded to a glass substrate. FIG10 is a schematic top view showing a peeling method of the second resin substrate of the previous laminated sheet. FIG11 is a schematic top view showing a peeling method of the second resin substrate of the previous laminated sheet. FIG12 is a schematic top view showing an example of a manufacturing method of another example of the laminated sheet in step order. FIG. 13 is a schematic cross-sectional view showing an example of another method for manufacturing a laminated sheet in a step-by-step manner. FIG. 14 is a schematic cross-sectional view showing an example of another method for manufacturing a laminated sheet in a step-by-step manner. FIG. 15 is a schematic cross-sectional view showing another example of another method for manufacturing a laminated sheet in a step-by-step manner. FIG. 16 is a schematic cross-sectional view showing another example of another method for manufacturing a laminated sheet in a step-by-step manner. FIG. 17 is a schematic cross-sectional view showing a method for peeling off the second resin substrate of another example of a laminated sheet.

10: Laminated Sheets

12: 1st resin substrate

12a,18a: Surface

12e: Corner

13a: Side 1

13b: Side 2

13c: Side 3

13d: 4th side

13e: Vertex

15: Layered part

18: Protrusion

18e: Vertex

D ₁ : 1st direction

D ₂ : 2nd direction

Dp: Direction

d ₁ ,d ₃ : Length of the protruding part

d ₂ : Length of the protrusion in the direction parallel to the first side

d ₄ : Length of the protrusion in the direction parallel to the second side

L ₁ : Length

L ₂ : Length

M ₁ ,M ₂ : intersection point

Claims (6)

A laminated sheet, which is laminated with a first resin substrate, an intermediate layer and a second resin substrate in sequence, and the first resin substrate and the intermediate layer are of the same shape and size and are laminated to form a laminated portion, the first resin substrate has a quadrilateral shape when observed from the normal direction of the surface of the first resin substrate, the second resin substrate has a larger area than the first resin substrate and the intermediate layer, and when observed from the normal direction of the surface of the first resin substrate, at the corner including the vertex where the first side and the second side of the first resin substrate intersect orthogonally, there is a protrusion protruding from the first side, the vertex and the outer edge of the second side, The length of the protrusion from the first side in the first direction perpendicular to the first side is 5 mm to 20 mm, the length of the protrusion from the intersection of the protrusion and the first side in the direction parallel to the first side is 10 mm to 40 mm, the length of the protrusion from the second side in the second direction perpendicular to the second side is 5 mm to 20 mm, the length of the protrusion from the intersection of the protrusion and the second side in the direction parallel to the second side is 10 mm to 40 mm. As in claim 1, a laminated sheet, wherein an intermediate layer which is separated from the laminated portion and different from the intermediate layer, and a first resin substrate which is different from the first resin substrate are sequentially laminated on the protruding portion of the second resin substrate. A laminated sheet as claimed in claim 1 or 2, wherein the outline of the shape of the protrusion observed from the normal direction of the surface of the first resin substrate is composed of at least one of a straight line and a curve. A laminated sheet as claimed in claim 1 or 2, wherein the shape of the protrusion observed from the normal direction of the surface of the first resin substrate is a polygon, a sector or an elliptical sector. The laminated sheet of claim 1 or 2, wherein the intermediate layer is a polysilicone resin layer. The laminated sheet of claim 1 or 2, wherein the first resin substrate and the second resin substrate are polyethylene terephthalate substrates.