JP2017185706A - Buffer material for hot press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer material for hot press capable of suppressing dust emission from the buffer material itself and adhesion of debris to the buffer material and transferring pressure uniformly to a target for press.SOLUTION: The buffer material for hot press has a fibrous layer constituted by fabric or nonwoven fabric, one or more substrate layers having a first polymer-based antistatic material existing along a surface of a fiber of the fibrous layer, a second polymer-based antistatic material existing on one main surface of the substrate layer as an outermost layer and a third polymer-based antistatic material existing on another main surface of the substrate layer as an outermost layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat press cushioning material.

  Printed circuit boards such as copper-clad laminates and flexible printed circuit boards that are frequently used in various electronic devices, and architectural and aircraft materials such as decorative boards and honeycomb boards are generally processed and molded using hot pressing or thermocompression bonding. . At that time, the heat press cushioning material is arranged and used in such a manner as to be sandwiched between the hot press disk and the press object.

  Therefore, the heat press cushioning material has characteristics such as heat resistance and durability that can withstand the heat and pressure from the hot press machine, and thermal conductivity and cushioning properties that can uniformly transmit heat and pressure to the object to be pressed. Desired.

  On the other hand, the buffer material for hot press may directly come into contact with the object to be pressed during use. For example, if foreign matter adheres to the contact surface of the heat press cushioning material with the object to be pressed, it may cause a foreign matter defect in the pressed product. Moreover, the buffer material for hot presses may process a press target object indirectly by interposing a metal plate between itself and a press target object. For example, if foreign matter adheres between the buffer material for hot press and the metal plate, the heat and pressure from the hot press plate are not easily transmitted to the object to be pressed. In order to prevent such foreign matter from adhering, for example, a buffer material for heat press subjected to antistatic treatment has been proposed (Patent Document 1). Moreover, in order to suppress generation | occurrence | production of such a foreign material, the buffer material for hot press which provided the heat resistant elastic layer in the end surface, for example is proposed (patent document 2).

JP 2011-1116034 A JP 2014-87999 A

  An object of the present invention is to provide a buffer material for hot press that can suppress dust generation from the buffer material itself and adhesion of foreign matter to the buffer material, and can uniformly transmit pressure to the object to be pressed. It is to be.

  The heat-press cushioning material according to the embodiment includes a fibrous layer composed of a woven fabric or a non-woven fabric, and a first polymer-based antistatic material present along the surface of the fiber of the fibrous layer. One or more base material layers, a second polymer antistatic material existing as an outermost layer on one main surface of the base material layer, and an outermost layer on the other main surface of the base material layer As a third polymer antistatic material.

  According to the cushioning material for hot press of the present invention, it is possible to suppress dust generation from the cushioning material itself and adhesion of foreign matter to the cushioning material, and to transmit pressure uniformly to the press object. Can do.

It is sectional drawing to which some buffer materials for hot press concerning one embodiment were expanded. It is sectional drawing to which some thermal shock absorbing materials concerning the further embodiment were expanded. It is sectional drawing to which some thermal shock absorbing materials concerning the further embodiment were expanded. It is sectional drawing to which some thermal shock absorbing materials concerning the further embodiment were expanded. It is sectional drawing to which some thermal shock absorbing materials concerning the further embodiment were expanded.

  The heat-press cushioning material according to the embodiment includes a fibrous layer composed of a woven fabric or a non-woven fabric, and a first polymer-based antistatic material present along the surface of the fiber of the fibrous layer. One or more base material layers, a second polymer antistatic material existing as an outermost layer on one main surface of the base material layer, and an outermost layer on the other main surface of the base material layer As a third polymer antistatic material.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view illustrating an example of a heat press cushioning material according to an embodiment. The heat press cushioning material 10 includes a fibrous layer 1 made up of a plurality of intertwined fibers 2. A polymer-based antistatic material 3 is present along the surface of the fiber 2. The fibrous layer 1 and the polymer-based antistatic material 3 constitute a base material layer 4. The polymer antistatic material 3 includes a polymer material and an antistatic material 3c dispersed in the polymer material. The polymer antistatic material 15 is present to have a substantially flat surface so as to cover the entire surface on one main surface of the base material layer 4 described above. The polymer antistatic material 16 is present with a substantially flat surface so as to cover the entire surface of the other main surface of the base material layer 4 described above. In this embodiment, the polymer antistatic material 15 includes a polymer material and an antistatic material 15c dispersed therein, and the polymer antistatic material 16 is dispersed in the polymer material. Antistatic material 16c.

  In this embodiment, the polymer antistatic material 3 existing along the surface of the fiber 2 corresponds to the first polymer antistatic material described above. The polymer antistatic material 15 present on one main surface of the base material layer 4 corresponds to the above-mentioned second polymer antistatic material. The polymer antistatic material 16 existing on the other main surface of the base material layer 4 corresponds to the above-described third polymer antistatic material.

  With such a configuration, the heat press cushioning material 10 includes the base material layer 4 including the fibrous layer 1 and the polymer-based antistatic material 3 existing along the surface of the fiber 2 of the fibrous layer 1. The polymer antistatic material 15 present on the layer 4 and providing the outermost layer shown on the base layer 4 in FIG. 1 and the bottom shown on the base layer 4 in FIG. A polymer antistatic material 16 is provided to provide an outer layer.

  The fibrous layer 1 can contain a sufficient amount of fibrous material for use as a buffer material for hot press. The fibrous material includes, for example, at least one fiber. For example, the fiber may be composed of one fiber or may be composed of two or more fibers. For example, the fibrous layer 1 can be a woven or non-woven fabric, or a combination thereof. For example, when the fibrous layer 1 is a woven fabric, the weaving method may be any of a plain weave, a twill weave, a satin weave, or a multiple weave of these, but is not limited thereto. The thickness of one layer of the fibrous layer 1 may be in the range of 0.05 mm to 5.0 mm, for example, may be in the range of 0.3 mm to 4.0 mm, but is not limited thereto. It is not a thing.

  The hot-press cushioning material 10 may include at least one fibrous layer. For example, the heat press cushioning material 10 may be composed of at least one fibrous layer, may include a plurality of fibrous layers, and may be, for example, an overlap of a plurality of fibrous layers. Good.

  The shape of the fiber 2 may be, for example, a filament yarn shape or a spun yarn shape. For example, the fibers contained in the fibrous layer may be only filament yarn-like fibers, may be only span yarn-like fibers, or may be a mixture of filament yarn-like fibers and span yarn-like fibers, It is not limited to these.

  The thickness or width of the fiber 2 may be in the range of 1 μm to 100 μm, for example.

  The fibers 2 included in the fibrous layer 1 may be, for example, glass fibers, carbon fibers, ceramic fibers, polyester fibers, aramid fibers, polybenzoxazole (PBO) fibers, and combinations of two or more thereof. However, it is not limited to these.

  The polymer antistatic material 3 may be present so as to coat the surface of the fiber 2, for example.

  The above-described polymer-based antistatic materials 3, 15 and 16 are members having antistatic performance, and thus the heat press buffer material 10 is provided with antistatic performance. In other words, the polymer-based antistatic materials 3, 15, 16 may be polymer-based members that are configured and blended so as to prevent charging.

  The antistatic performance refers to a performance with a low property that foreign matter such as dust and dust adheres to itself due to static electricity or the like. In other words, a substance having such antistatic performance is difficult to be charged, and as a result, adhesion of foreign matters is prevented. For example, the antistatic performance can be represented by a charged voltage. The charged voltage may be an initial charged voltage obtained in accordance with, for example, the half-life measuring method of JIS L 1094.

  The degree of antistatic performance of the polymer antistatic material in the state included in the buffer material for hot press according to the embodiment is lower when expressed as a charged voltage obtained according to the half-life measuring method of JIS L 1094. More preferably, for example, it may be 1 kV or less or 0.5 kV or less. In other words, the antistatic performance as a whole of the buffer material for a hot press according to the embodiment is expressed as a charged voltage measured by a method based on the measurement method of JIS L 1094.

  The heat press buffer material having an antistatic performance with a charged voltage of 1 kV or less obtained in accordance with the half-life measurement method of JIS L 1094 can suppress, for example, foreign matter adhesion to the heat press buffer material. For example, a buffer material for a hot press having an antistatic performance with a charged voltage of 0.5 kV or less obtained in accordance with the half-life measuring method of JIS L 1094 can further suppress foreign matter adhesion to itself.

  The desired antistatic performance of the heat press buffer material according to the embodiment is, for example, the content of the polymer antistatic material contained in the heat press buffer material, or the type of antistatic material contained in the polymer antistatic material, It can be achieved by adjusting the content or combination.

  The polymer antistatic material may be, for example, a combination of the antistatic material and the polymer material as described above, or may be a polymer material having antistatic performance itself. For example, when the polymer antistatic material is a combination of an antistatic material and a polymer material, the antistatic material can be dispersed in the polymer material. The first, second and third polymer-based antistatic materials may be, for example, the same member, different members, or any two may be the same member. However, it is not limited to these.

  The polymer material can be, for example, a polymer having heat resistance against a temperature such as hot pressing or thermocompression bonding. For example, polymer materials include fluoro rubber, silicone rubber, ethylene / propylene / diene rubber (EPDM), fluoro resin, phenol resin, epoxy resin, polyimide resin, melamine resin, unsaturated polyester resin, thermosetting acrylic resin, furan resin. , Urea resin or polyurethane resin, or any combination of two or more thereof.

  The antistatic material 3c can be, for example, a metal oxide such as titanium oxide, zinc oxide, or iron oxide powder, carbon powder, or a combination of any two or more thereof.

  The thicknesses of the second and third polymer-based antistatic materials 15 and 16 included in the buffer material 10 for hot press according to the embodiment vary slightly depending on the unevenness of the main surface of the base material layer. . For example, the second and third polymer-based antistatic materials that are included in the buffer material for hot press according to the embodiment may exist as outermost layers having a thickness of 0.1 μm or more and 1000 μm or less. It is not limited to these. In the case of a heat press cushioning material having the second and third polymer-based antistatic materials having a thickness of less than 0.1 μm, sufficient wear resistance may not be obtained for use in hot press processing and thermocompression bonding. .

  The buffer material 10 for hot presses according to the embodiment can be manufactured as follows, for example.

  A polymer material, an antistatic material, and a fibrous layer are prepared as materials for the heat press cushioning material 10.

  First, antistatic materials are added to and dispersed in various polymer materials to prepare polymer antistatic materials 3, 15, and 16. Next, a solvent is added to the polymer antistatic material 3 to adjust the viscosity, and the fibrous layer 1 is impregnated with it. Subsequently, it is dried to obtain the base material layer 4. A polymer antistatic material 15 is applied on one main surface of the base material layer 4, and a polymer antistatic material 16 is applied on the other main surface of the base material layer 4. After drying, heat treatment is further performed, and the end portion is cut to obtain the heat press cushioning material 10.

  In such an embodiment, the buffer material for hot press 10 can have the following effects.

  The heat-press cushioning material 10 has polymer-based antistatic materials 15 and 16 on both the side that directly or indirectly contacts the object to be pressed and the side that directly or indirectly contacts the hot press panel. ing. Therefore, the heat press cushioning material 10 can suppress dust generation due to unraveling of fibers from its own contact surface and adhesion of foreign matter to the contact surface, and transmits pressure uniformly to the press object. be able to.

  Furthermore, since the buffer material 10 for hot press has the polymer-type antistatic material 3 also in the base material layer, it is possible to suppress the fiber from coming off from the cut portion.

  FIG. 2 is a cross-sectional view showing an example of a heat press cushioning material according to a further embodiment. The heat press cushioning material 20 includes film-like antistatic polymers 25 and 26 in place of the second and third polymer-based antistatic materials 15 and 16 of the heat press cushioning material 10 described above. The film-like antistatic polymer 25 is present so as to cover an approximately flat surface of one main surface of the base material layer 4 described above. The film-like antistatic polymer 26 is present so as to cover the substantially flat surface of the other main surface of the base material layer 4 described above.

  In this embodiment, the polymer antistatic material 3 existing along the surface of the fiber 2 corresponds to the first polymer antistatic material described above. The film-like antistatic polymer 25 on one main surface of the base material layer 4 corresponds to the above-described second polymer-based antistatic material. The film-like antistatic polymer 26 on the other main surface of the base material layer 4 corresponds to the above-described third polymer-based antistatic material.

  With such a configuration, the heat press buffer material 20 includes the base material layer 4 including the fibrous layer 1 and the polymer-based antistatic material 3 existing along the surface of the fiber 2 of the fibrous layer 1. Film-like antistatic polymer 25 present on layer 4 and providing the outermost layer shown on substrate layer 4 in FIG. 2 and shown below substrate layer 4 in FIG. A film-like antistatic polymer 26 is provided which provides the outermost layer.

  The second and third polymer-based antistatic materials may be, for example, a polymer in which an antistatic material is dispersed, or a film-like antistatic polymer. For example, the film-like antistatic polymer may be a polyimide film containing an antistatic material or a fluororesin film containing an antistatic material, but is not limited thereto.

  The buffer material 20 for hot press according to the embodiment can be manufactured as follows, for example, using the base material layer 4 described above as a base.

  As materials for the heat press buffer material 20, a polymer material, an antistatic material, a fibrous layer, and a film-like antistatic polymer are prepared.

  First, the base material layer 4 is formed as described above. A film-like antistatic polymer 25 is adhered on one main surface of the base material layer 4, and a film-like antistatic polymer 26 is adhered on the other main surface of the base material layer 4. Subsequently, heat treatment is performed and integrated, and the end portion is cut to obtain the heat press cushioning material 20.

  For example, when bonding a film-type antistatic polymer and a polymer-based antistatic material, place the polymer-based antistatic material on the adhesive surface with the film-shaped antistatic polymer before it solidifies, and then dry it. The polymer antistatic material may be adhered when solidified. When the film-like antistatic polymer and another member are bonded, an adhesive may be used on the adhesive surface between the film-like antistatic polymer and the other member.

  The adhesive may be, for example, an adhesive having heat resistance that can withstand heat from a hot press machine during hot pressing or thermocompression bonding. For example, an epoxy adhesive or a ceramic adhesive may be used, but is not limited to these.

  In such an embodiment, the buffer material for hot press 20 can have the following effects in addition to the effects of the buffer material for hot press 10 described above.

  Since the buffer material 20 for hot press has the film-like antistatic polymers 25 and 26 on both main surfaces thereof, it suppresses dust generation due to the fiber 2 from the main surface of the base material layer 4 being unwound. obtain.

  Further embodiments may include one or more first intermediate layers present between the second polymeric antistatic material described above and one major surface of the substrate layer described above. One or more second intermediate layers present between the third polymer-based antistatic material and the other main surface of the base material layer may be included.

  An embodiment including the above-described first intermediate layer and the above-described second intermediate layer will be described below with reference to the drawings.

  FIG. 3 is a cross-sectional view showing an example of a heat press cushioning material according to a further embodiment. The buffer material 30 for hot press is further provided with the film-like polymers 37 and 38 as intermediate layers and the polymer antistatic materials 35 and 36 as outermost layers in the configuration of the base material layer 4 described above. The film-like polymer 37 is present so as to cover an approximately flat surface on one main surface of the base material layer 4 described above. The polymer-based antistatic material 35 is present so as to cover the film-like polymer 37 described above. The film polymer 38 is present so as to cover a substantially flat surface on the other main surface of the base material layer 4 described above. The polymer-based antistatic material 36 is present so as to cover the film polymer 38 described above. The polymer antistatic material 35 includes a polymer material and an antistatic material 35c dispersed therein, and the polymer antistatic material 36 includes a polymer material and an antistatic material 36c dispersed therein. Including.

  In this embodiment, the polymer antistatic material 3 existing along the surface of the fiber 2 corresponds to the first polymer antistatic material described above. The film-like polymer 37 on one main surface of the base material layer 4 corresponds to the first intermediate layer described above. The polymer antistatic material 35 corresponds to the above-mentioned second polymer antistatic material. Moreover, the film-like polymer 38 on the other main surface of the base material layer 4 corresponds to the above-mentioned second intermediate layer. The polymer antistatic material 36 corresponds to the above-mentioned third polymer antistatic material.

  With such a configuration, the heat press buffer material 30 includes the base material layer 4 including the fibrous layer 1 and the polymer-based antistatic material 3 existing along the surface of the fiber 2 of the fibrous layer 1. A film-like polymer 37 present on the layer 4 and providing the intermediate layer shown on the substrate layer 4 in FIG. 3, a polymer-based antistatic material 35 providing the outermost layer, and the substrate in FIG. A film-like polymer 38 that provides the intermediate layer shown below the material layer 4 and a polymer-based antistatic material 36 that provides the outermost layer are provided.

  The intermediate layer in the state included in the buffer material for hot press according to the embodiment may have, for example, antistatic properties or may not have antistatic properties. Moreover, for example, a layer made of a film-like polymer may be used, or a layer made of a polymer-based material (non-film-like polymer) that is not a film may be used.

  The film polymer may be, for example, polytetrafluoroethylene (PTFE), ethylenetetrafluoroethylene copolymer (ETFE), perfluoroalkoxy fluororesin (PFA), polyimide, or the like, and may contain an antistatic material.

  The intermediate layer may have a thickness of 1 μm to 500 μm, for example, but is not limited thereto. The intermediate layer having a thickness of 5 μm to 300 μm may have sufficient flexibility for handling when used for manufacturing, for example.

  The film-like polymers 37 and 38 in the state included in the heat press cushioning material according to the embodiment can suppress dust generation due to, for example, the fiber 2 from the base layer 4 being unwound.

  The buffer material 30 for hot press according to the embodiment can be manufactured as follows, for example, using the base material layer 4 described above as a base.

  A polymer material, an antistatic material, a fibrous layer, and a film-like polymer are prepared as materials for the heat press buffer material 30.

  First, the base material layer 4 is formed as described above. A film-like polymer 37 is adhered on one main surface of the base material layer 4, and a film-like polymer 38 is adhered on the other main surface of the base material layer 4, and heat treatment is performed for integration. Subsequently, a polymer-based antistatic material 35 is applied on the main surface of the film-like polymer 37. A polymer-based antistatic material 36 is applied on the main surface of the film polymer 38. And heat processing is performed, an edge part is cut | disconnected, and the buffer material 30 for hot presses is obtained.

  For example, when adhering a film-like polymer and a polymer-based antistatic material, the polymer-based antistatic material on the adhesive surface with the film-like polymer is placed before solidifying, and then dried and the polymer-based antistatic material You may make it adhere when solidifying. When bonding a film-like polymer and another member, you may use an adhesive agent for the adhesive surface of a film-like polymer and another member.

  In such an embodiment, the hot press cushioning material 30 may have the same effects as the hot press cushioning materials 10 and 20 described above.

  The heat press cushioning material 30 has the film-like polymers 37 and 38 on both main surfaces of its own base material layer, and therefore can suppress dust generation due to unraveling of the fibers 2 from the base material layer 4.

  A further embodiment may include a fourth polymer-based antistatic material on the end face of the above-described heat press cushioning material.

  An embodiment including a fourth polymer-based antistatic material will be described below with reference to the drawings.

  FIG. 4 is a cross-sectional view showing an example of a heat press cushioning material according to a further embodiment. In addition to the structure of the heat press buffer material 30 described above, the heat press buffer material 40 further includes a layer of a polymer-based antistatic material 49. The polymer-based antistatic material 49 is present along the end surface of the heat press buffer material 30 described above so as to cover the end surface.

  The polymer antistatic material present so as to cover the end face of the heat press buffer material may be provided in the heat press buffer material 10 or 20.

  In this embodiment, the polymer antistatic material 49 present along the end surface of the heat press buffer material 30 so as to cover the end surface corresponds to the fourth polymer antistatic material.

  With such a configuration, the heat press buffer material 40 includes the base material layer 4 including the fibrous layer 1 and the polymer-based antistatic material 3 existing along the surface of the fiber 2 of the fibrous layer 1. A film-like polymer 37 present on the layer 4 and providing the intermediate layer shown on the substrate layer 4 in FIG. 4 and a polymer-based antistatic material 35 providing the outermost layer, the substrate in FIG. The film-like polymer 38 that provides the intermediate layer shown below the layer 4, the polymer-based antistatic material 36 that provides the outermost layer, and the polymer-based antistatic material 49 that exists so as to cover the end face are provided.

  The fourth polymer-based antistatic material 49 may be the same member as one of the first, second and third polymer-based antistatic materials 3, 35, 36, or may be a different member. However, it is not limited to these. For example, polymer antistatic materials, which are the same members, can improve the mutual adhesion due to compatibility.

  The fourth polymer-based antistatic material 49 in the state included in the heat press cushioning material according to the embodiment can further suppress, for example, dust generation such as unraveling of the fibers 2 from the end surface of the heat press cushioning material. . Moreover, the adhesion of foreign matter to the end face of the heat press cushioning material can be further suppressed.

  The buffer material for hot press 40 according to the embodiment can be manufactured as follows using, for example, the buffer material for hot press 30 described above as a base.

  A polymer material, an antistatic material, a fibrous layer, and a film-like polymer are prepared as materials for the heat press buffer material 40.

  First, an antistatic material is added to the polymer material and dispersed to prepare a polymer antistatic material 49. Separately, the base 30 is formed as described above. A solvent is added to the polymer antistatic material 49 to adjust the viscosity, and the polymer antistatic material 49 is applied onto the end face of the base 30. Subsequently, it is dried and heat-treated to obtain a heat press cushioning material 40.

  For example, when the buffer material 40 for hot press is manufactured, the end surface of the base 30 may be impregnated with the polymer antistatic material 49.

  In such an embodiment, the buffer material for hot press 40 may have the following effects in addition to the effects of the buffer materials for hot press 10 to 30 described above.

  The heat press cushioning material 40 has a configuration in which the polymer antistatic material 49 is present on the end face of the base 30, so that dust is generated due to the fibers 2 coming off from the base material layer 4, and foreign matters adhere to the end face. Can be further suppressed.

  FIG. 5 is a cross-sectional view showing an example of a heat press cushioning material according to a further embodiment. In addition to the base material layer 4 described above, the hot-press cushioning material 50 further includes a film polymer 58 as an intermediate layer, and further includes layers of polymer-based antistatic materials 55 and 56 as outermost layers. The film polymer 58 is present so as to cover a substantially flat surface of one main surface of the base material layer 4 described above. The polymer-based antistatic material 56 is present so as to cover the film-like polymer 58 described above. The polymer-based antistatic material 55 is present with a substantially flat surface so as to cover the entire surface of the other main surface of the base material layer 4 described above. The polymer antistatic material 55 includes a polymer material and an antistatic material 55c dispersed therein, and the polymer antistatic material 56 includes a polymer material and an antistatic material 56c dispersed therein. Including.

  In this embodiment, the polymer antistatic material 3 existing along the surface of the fiber 2 corresponds to the first polymer antistatic material described above. The polymer antistatic material 55 existing as the outermost layer on one main surface of the base material layer 4 corresponds to the above-described second polymer antistatic material. The polymer antistatic material 56 existing as the outermost layer on the other main surface of the base material layer 4 corresponds to the third polymer antistatic material described above, and the polymer antistatic material 56 and the base material The film-like polymer 58 interposed between the layers 4 corresponds to the above-mentioned intermediate layer.

  With such a configuration, the heat press buffer material 50 includes the base material layer 4 including the fibrous layer 1 and the polymer antistatic material 3 existing along the surface of the fiber 2 of the fibrous layer 1. Polymeric antistatic material 55 present on layer 4 and providing the outermost layer shown above substrate layer 4 in FIG. 5, and shown below substrate layer 4 in FIG. A film-like polymer 58 providing an intermediate layer and a polymer-based antistatic material 56 providing an outermost layer are provided.

  The buffer material 50 for hot press according to the embodiment can be manufactured as follows, for example, using the above-described base material layer 4 as a base.

  A polymer material, an antistatic material, a fibrous layer, and a film-like polymer are prepared as materials for the heat press buffer material 50.

  First, the base material layer 4 is formed as described above. A film-like polymer 58 is bonded onto one main surface of the base material layer 4. A polymer antistatic material 55 is applied on the other main surface of the base material layer 4. Further, a polymer-based antistatic material 56 is applied on the main surface of the film polymer 58. Finally, it is dried and heat-treated to obtain a heat press cushioning material 50.

  In the buffer material for hot press according to the embodiment, for example, the configuration on one main surface of the base material layer 4 and the configuration on the other main surface of the base material layer 4 are the same. They may be different from each other.

  The configuration on the main surface of the base material layer 4 may be the outermost polymer antistatic material. One or more intermediate layers or other base material layers may be included between the base material layer 4 and the outermost polymer antistatic material. For example, when the structure on the main surface of the base material layer 4 is a plurality of layers, the order of the layers to be arranged is that the polymer antistatic material may be arranged in the outermost layer, and the order of the layers arranged in the middle The order is not limited.

  Any of the above-described embodiments can have the following effects.

  The thickness of the buffer material for hot press according to the embodiment may be in the range of 0.1 mm to 5.5 mm, for example, may be in the range of 0.5 mm to 5.0 mm, but is not limited thereto. It is not something. The heat press cushioning material having a thickness of more than 5.5 mm results in a decrease in heat conduction from the heat press panel and a decrease in productivity.

The volume of the voids included in the buffer material for hot press according to the embodiment is, for example, the following formula:
[Volume of void contained in buffer material for hot press] = [Volume of buffer material for hot press] − ([Volume of fiber contained in buffer material for hot press] + [Polymer system contained in buffer material for hot press] Volume of antistatic material] + [volume of intermediate layer contained in buffer material for hot press])
May be calculated as follows.

  The volume of the fiber contained in the buffer material for hot press may be calculated from, for example, the weight per unit area of the fibrous layer used for manufacturing the buffer material for hot press and the specific gravity of the fiber.

  The volume of the polymer antistatic material contained in the heat press buffer material may be calculated from, for example, the weight and specific gravity of the polymer antistatic material used in the manufacture of the heat press buffer material. It may be calculated from the use weight and specific gravity of the functional polymer.

  The volume of the intermediate layer contained in the heat press buffer material may be calculated from, for example, the use weight and specific gravity of the film-like polymer or polymer-based antistatic material used in the manufacture of the heat press buffer material.

The volume ratio of the voids included in the heat press buffer material is, for example, the following formula:
[Porosity] = ([Volume volume contained in buffer material for hot press] / [Volume of buffer material for hot press]) × 100%
May be calculated as the porosity.

  The porosity of the buffer material for hot presses according to the embodiment may be, for example, 20% to 80%, for example, 40% to 75%. For example, a buffer material for hot press having a porosity of 20% to 80% is compressed at a normal pressure of 3 MPa in the thickness direction at room temperature, and the thickness is 30 to 90% of the thickness before compression. Can be compressed.

  For example, a cushioning material for hot press having a porosity of less than 20% has low cushioning properties. Moreover, when the buffer material for hot presses having a porosity exceeding 80% is pressed a plurality of times, the buffer material sags and the cushioning property cannot be maintained.

  In general, a cushioning material for hot press filled with a polymer-based antistatic material has low cushioning properties. However, since the buffer material for hot press according to the embodiment includes the above-described gap, the cushioning material has sufficient cushioning properties for use in hot press processing and thermocompression bonding. Moreover, since the polymer-based antistatic material is present, adhesion of foreign matters can be suppressed.

  The porosity of the heat press buffer material may be calculated separately, for example, by dividing it into an end portion and a center portion of the heat press buffer material.

  The end portion of the heat press buffer material may be, for example, a portion at a distance of 3 mm inward from the end surface of the heat press buffer material.

  The central portion of the heat press cushioning material may be, for example, a portion at a distance of 100 mm or more inward from the end face of the hot press cushioning material.

The relationship between the ratio of the porosity of the end portion and the central portion in the buffer material for hot press is, for example,
The following formula:
[Void ratio] = [Void ratio at the end of the buffer material for hot press] / [Void ratio at the center of the buffer material for hot press]
May be calculated as a void ratio.

  The end surface of the heat-press cushioning material is a surface that passes between both main surfaces facing each other at the edge of the heat-press cushioning material in the final form. When the shape of the main surface is a quadrangle, there can be four end surfaces corresponding to the four sides defining the main surface. Regarding the definition of the end and the center of the heat press cushioning material, the distance from the end surface is the outermost surface on the end face side of the heat press cushioning material in the final form and forms the boundary with the outside world. It may be a distance from the end face of the press cushioning material. Further, for example, the distance from the end face is a distance measured from a specific region of the end face forming the outer edge of the heat press cushioning material in the final form, perpendicularly to the center side of the heat press cushioning material. possible. For example, in the case where there are irregularities on the end surface, it may be the distance from the region that protrudes most outward. Further, for example, in the case of the heat press buffer material 40 shown in FIG. 4, the polymer antistatic material 49 exists as the outermost layer on the end face. In this case, the distance from the surface of the polymer antistatic material 49 is measured. Can be done.

  The gap ratio of the heat press buffer material according to the embodiment may be, for example, 0.9 or more. When the buffer material for hot press having a void ratio of less than 0.9 is used for, for example, hot press processing or thermocompression bonding, a compression difference is likely to occur at the end and the center of the buffer material for hot press, and press molding. Cavities (i.e., voids) can occur inside the article.

  The buffer material for hot presses according to the embodiment can be used as follows, for example.

  The buffer material for hot press according to the embodiment can be used for hot press processing or thermocompression bonding alone or after a sufficient number of sheets are stacked for the application.

  The buffer material for hot press according to the embodiment can be used for hot press processing and thermocompression bonding after cutting into a size sufficient for the application.

  When the heat press cushioning material according to the embodiment is cut, since a polymer-based antistatic material is present on the surface of the fiber, dust generation due to unraveling of the fiber contained in the base material layer can be suppressed.

  For example, when the buffer material for hot press of one embodiment is cut, a polymer-based antistatic material is applied to the cut surface, dried and heat-treated, and then the buffer material for hot press is subjected to hot press processing or It may be used for thermocompression bonding.

  The buffer material for hot press according to the embodiment has a role as a cushion material having sufficient cushioning properties for applications such as hot press processing and thermocompression bonding.

  Embodiment of invention is an illustration and the range of invention is not limited to them.

<Example>
In order to confirm the effect of the present invention, the buffer materials for hot presses of Examples 1 to 11 were manufactured and comparative experiments were performed.

・ Example 1
Manufacture of buffer material for hot press according to Example 1 The material of the buffer material for hot press according to Example 1 is an aramid double weave of basis weight: 900 g / m ² , thickness 2.0 mm, and Conex (registered trademark). A woven fabric, a fluororubber compound based on Daiel (registered trademark) G701, an epoxy resin 383J, carbon of Ketjen Black EC600JD, and a polyimide film (Toray DuPont Co., Ltd., thickness 125 μm, product number 500H) were prepared. .

  Aramid double woven fabric was used as the fibrous layer. Fluoro rubber compound and epoxy resin were used as polymer materials. Carbon was used as an antistatic material. The polyimide film was used as a non-antistatic film polymer.

  The buffer material for hot press according to Example 1 was produced as follows.

  When the weight of the fluororubber compound was 100, the weight part of carbon relative to that (ie, phr) was 15 phr, and 15 phr of carbon was dispersed in the fluororubber compound to prepare a fluororubber-based antistatic material. A solvent such as ethyl acetate or methyl ethyl ketone was added to the fluororubber antistatic material to prepare a paste of fluororubber antistatic material having a solid content of about 20 to 50%.

An aramid double woven fabric was impregnated with a paste of the fluororubber antistatic material. Thereafter, the solvent was removed by drying, and the impregnated solid content of the fluororubber-based antistatic material was 500 g / m ² .

  On both main surfaces of the aramid double woven fabric impregnated with the fluororubber antistatic material, a paste of fluororubber antistatic material was applied. Thereafter, the solvent was removed by drying, and a polyimide film was thermocompression-bonded and integrated on both main surfaces, and the fluororubber antistatic material was cured.

  On the other hand, 15 phr of carbon and a curing agent were added to the epoxy resin and dispersed to prepare an epoxy resin antistatic material.

  An epoxy resin-based antistatic material was applied as the outermost layer on both main surfaces of the constituent members integrated by thermocompression bonding of the polyimide film. Subsequently, heat treatment was performed to cure the epoxy resin antistatic material and cut the end.

  Further, a solvent such as ethyl acetate or methyl ethyl ketone was added to the fluororubber antistatic material to prepare a paste of fluororubber antistatic material having a solid content of about 5 to 20%. The glue of the fluororubber antistatic material was applied to the cut end. After the edge treatment, drying was performed to remove the solvent, and heat treatment was performed to obtain a heat press cushioning material having a thickness of 2.1 mm. This was used as the heat press cushioning material of Example 1.

・ Example 2
From the manufacturing method of the heat press buffer material according to Example 1, a heat press buffer material was manufactured by a manufacturing method in which the step of integrating the polyimide film by thermocompression bonding was omitted. This was used as the heat press cushioning material of Example 2.

  The buffer material for hot presses according to Example 2 is different from the buffer material for hot presses according to Example 1 in that it does not have a polyimide film.

・ Example 3
The heat press buffer material was manufactured from the method for manufacturing the heat press buffer material according to Example 1 by a manufacturing method in which the end treatment process using the fluororubber-based antistatic material was omitted. This was used as the heat press cushioning material of Example 3.

  The buffer material for hot press according to Example 3 is different from the buffer material for hot press according to Example 1 in that the end treatment using the fluororubber-based antistatic material is not performed.

Example 4
From the manufacturing method of the buffer material for hot press according to Example 1, the manufacturing method omits the step of crimping and integrating the polyimide film and the step of processing the edge using the fluororubber-based antistatic material. A shock absorbing material was manufactured. This was used as the heat press cushioning material of Example 4.

  The buffer material for hot press according to Example 4 does not have a polyimide film and has not been subjected to end treatment using a fluororubber-based antistatic material as compared with the buffer material for hot press according to Example 1. There is a difference.

・ Example 5
Production of buffer material for hot press according to Example 5 The material of the buffer material for hot press according to Example 5 was a weight per unit area of 900 g / m ² , a thickness of 2.0 mm, and an aramid double weave of Conex (registered trademark). A woven fabric, a fluororubber compound based on Daiel (registered trademark) G701, Ketjen Black EC600JD carbon, and an antistatic fluororesin film were prepared.

  Aramid double woven fabric was used as the fibrous layer. The fluororubber compound was used as a polymer material. Carbon was used as an antistatic material. The antistatic fluororesin film was used as the outermost layer.

  A buffer material for hot press according to Example 5 was produced as follows.

  A fluororubber compound was prepared by dispersing 15 phr of carbon in a fluororubber compound. A solvent such as ethyl acetate or methyl ethyl ketone was added to the fluororubber antistatic material to prepare a paste of fluororubber antistatic material having a solid content of about 20 to 50%.

An aramid double woven fabric was impregnated with a paste of the fluororubber antistatic material. Thereafter, the solvent was removed by drying, and the impregnated solid content of the fluororubber-based antistatic material was 500 g / m ² .

  On both main surfaces of the aramid double woven fabric impregnated with the fluororubber antistatic material, a paste of fluororubber antistatic material was applied. Then, the solvent is removed by drying, and an antistatic fluororesin film is thermocompression-bonded and integrated on both main surfaces, and the fluororubber-based antistatic material is cured, the edges are cut, and heat press A cushioning material was obtained. This was used as the heat press cushioning material of Example 5.

Example 6
Manufacture of buffer material for hot press according to Example 6 The material of the buffer material for hot press according to Example 6 is an aramid double woven weave of basis weight: 900 g / m ² , thickness 2.0 mm, Conex (registered trademark) Fabric, fluororubber compound based on Daiel (registered trademark) G701, epoxy resin 383J, and Ketjen Black EC600JD carbon were prepared.

  Aramid double woven fabric was used as the fibrous layer. Fluoro rubber and epoxy resin were used as polymer materials. Carbon was used as an antistatic material.

  A buffer material for hot press according to Example 6 was produced as follows.

  Solvents such as ethyl acetate and methyl ethyl ketone were added to the fluororubber compound to prepare a fluororubber compound paste having a solid content of about 20 to 50%.

An aramid double woven fabric was impregnated with the paste of the fluororubber compound. Thereafter, the solvent was removed by drying, and the impregnated solid content of the fluororubber compound was 500 g / m ² . Further heat treatment was performed to cure the fluororubber compound.

  On the other hand, 15 phr of carbon was added to the epoxy resin and dispersed to prepare an epoxy resin antistatic material.

  An epoxy resin antistatic material was applied as the outermost layer on both main surfaces of the aramid double woven fabric impregnated with the fluororubber compound. Then, heat processing was performed, the epoxy resin type antistatic material was hardened, the edge part was cut | disconnected, and the buffer material for hot presses was obtained. This was used as the heat press cushioning material of Example 6.

・ Example 7
An end treatment step using a fluororubber-based antistatic material was added to the method for manufacturing a heat press buffer material according to Example 6 to manufacture a heat press buffer material. This was used as the heat press cushioning material of Example 7.

  The heat press buffer material according to Example 7 is different from the heat press buffer material according to Example 6 in that an end treatment using a fluororubber-based antistatic material is added.

Example 8
In the method for manufacturing a heat press cushioning material according to Example 6, the step of applying the epoxy resin-based antistatic material as the outermost layer is changed to a step of applying an epoxy resin. An end treatment process using an antistatic material was added to produce a heat press cushioning material. This was used as the heat press cushioning material of Example 8.

  The heat press cushioning material according to Example 8 has an epoxy resin present as the outermost layer as compared with the heat press cushioning material according to Example 6, and an end treatment using a fluororubber-based antistatic material. There is a difference in adding.

Example 9
The manufacturing method of the heat press cushioning material according to Example 6 was changed by omitting the step of impregnating the fluorinated rubber compound into the aramid double woven fabric, and further, the fluororubber antistatic material was used for the changed method. The heat treatment cushioning material was manufactured by adding the edge processing step. This was used as the heat press cushioning material of Example 9.

  Compared to the heat press cushioning material according to Example 6, the heat press cushioning material according to Example 9 does not impregnate the fluororubber compound into the aramid double woven fabric, and includes a fluororubber-based antistatic material. There is a difference in adding the edge processing used.

Example 10
The heat press cushioning material according to Example 6 was manufactured by omitting the step of applying an epoxy resin antistatic material as the outermost layer. This was used as the heat press cushioning material of Example 10.

  The heat press buffer material according to Example 10 is different from the heat press buffer material according to Example 6 in that there is no epoxy resin-based antistatic material as the outermost layer.

Example 11
In the method of manufacturing a heat press cushioning material according to Example 6, the step of applying an epoxy resin antistatic material as the outermost layer is changed to a step of applying an epoxy resin, and the fluororubber compound is changed to an aramid double woven fabric. The impregnation step was omitted, and an end treatment step using a fluororubber compound was added to produce a heat press cushioning material. This was used as the heat press cushioning material of Example 11.

In the heat press cushioning material according to Example 11, as compared with the heat press cushioning material according to Example 6, the epoxy resin is present as the outermost layer, and the aramid double woven fabric is impregnated with fluororubber. The difference is that there is no end treatment using fluoro rubber.

[Evaluation item]
・ Void ratio The void ratio at the end and center of the buffer material for hot press is expressed by the following formula:
[Void ratio] = [Void ratio at the end of the buffer material for hot press] / [Void ratio at the center of the buffer material for hot press]
Calculated by

-Adhesion of foreign matter after cutting The buffer material for hot press was cut, the end face of the cut buffer material for hot press was visually confirmed, and the appearance of foreign matter attached to the end face was evaluated in two stages. For example, as in 1 <2, 1 had a small amount of foreign matter adhering to the end surface of the heat press cushioning material, and 2 had a large amount of foreign matter adherence to the end surface of the hot press cushioning material.

-Dust generation at the time of hot press The press at a temperature of 200 ° C. and a pressure of 3 MPa was performed once in 60 minutes, and this press was performed a total of 10 times on the buffer material for hot press. Then, the buffer material for hot press and the metal plate, such as stainless steel (SUS), were visually confirmed, and the state of dust generation was evaluated in three stages. For example, the evaluation result is 1 <2 <3, where 1 is the least dusting state and 3 is much dusting.

-Adhesion of foreign matter during hot pressing The press at a temperature of 200 ° C and a pressure of 3 MPa was performed once in 60 minutes, and this press was performed 10 times in total on the buffer material for hot press. Then, the buffer material for hot press was confirmed by visual observation, and the state of foreign matter adhesion was evaluated in four stages. For example, as in 1 <2 <3 <4, 1 has the least foreign matter adhesion to the hot press cushioning material, and 4 has many foreign matter adhesion to the hot press cushioning material.

・ Effects on pressed products Hot pressing was performed using a buffer material for hot pressing. The inside of the press product formed by the hot press processing was confirmed, and the state of void generation was evaluated in two stages. For example, as in 1 <2, 1 had no voids inside the pressed product, and 2 had voids inside the pressed product.

[result]
The results of the evaluation items are as follows.

-Void ratio The gap ratio of the edge part and the center part in the buffer material for hot press was less than 0.9 in Examples 9 and 11 where fluororubber or a fluororubber-based antistatic material was present only at the edge part.

-Adhesion of foreign matter after cutting The buffer material for hot presses of Examples 1 to 5 having a base material layer produced by impregnating an aramid double woven fabric with a fluororubber-based antistatic material does not adhere foreign matter after cutting. There were few results.

-Dust generation at the time of hot press The heat press cushioning materials of Examples 1 and 3 using the polyimide film and Example 5 using the antistatic fluororesin film showed the least dust generation. On the other hand, in Examples 9 to 11 in which the outermost layer was not provided or the base material layer was not impregnated, much dust generation was observed.

-Adhesion of foreign matter during hot pressing In Examples 8, 10, and 11 where the outermost layer is not provided with an epoxy resin-based antistatic material, foreign matter adheres frequently.

-Effect on press products In the press products using the buffer materials for hot presses of Examples 9 and 11 having a void ratio of less than 0.9, abnormal occurrence of voids was observed.

General Evaluation In the heat press cushioning materials of Examples 1 to 5, the fluororubber-based antistatic material present in the base material layer, and the epoxy-based antistatic material or antistatic fluororesin film present as the outermost layer This greatly contributes to the antistatic property that suppresses the adhesion of foreign matter to the buffer material for hot press. Further, the fluororubber-based antistatic material present on the end face of the heat press cushioning material also contributes to the suppression of foreign matter adhesion to the heat press cushioning material. Moreover, the polyimide film which exists on the main surface of a base material layer has contributed to suppression of the dust generation from the base material layer of the buffer material for hot presses. And the buffer material for hot presses with a void ratio of 0.9 or more can be press-molded in a press-molded product without abnormal occurrence of voids.

  DESCRIPTION OF SYMBOLS 1 ... Fiber layer, 2 ... Fiber, 3c, 15c, 16c, 35c, 36c, 49c, 55c, 56c ... Antistatic material, 3, 15, 16, 35, 36, 49, 55, 56 ... Polymer type antistatic Materials: 4, base material layer, 10, 20, 30, 40, 50 ... buffer material for hot press, 25, 26 ... film-like antistatic polymer, 37, 38, 58 ... film-like polymer.

General Evaluation In the heat press cushioning materials of Examples 1 to 5, the fluororubber-based antistatic material present in the base material layer, and the epoxy-based antistatic material or antistatic fluororesin film present as the outermost layer This greatly contributes to the antistatic property that suppresses the adhesion of foreign matter to the buffer material for hot press. Further, the fluororubber-based antistatic material present on the end face of the heat press cushioning material also contributes to the suppression of foreign matter adhesion to the heat press cushioning material. Moreover, the polyimide film which exists on the main surface of a base material layer has contributed to suppression of the dust generation from the base material layer of the buffer material for hot presses. And the buffer material for hot presses with a void ratio of 0.9 or more can be press-molded in a press-molded product without abnormal occurrence of voids.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] One or more base material layers comprising a fibrous layer composed of a woven fabric or a nonwoven fabric, and a first polymer-based antistatic material present along the fiber surface of the fibrous layer , And
The second polymer antistatic material present as the outermost layer on one main surface of the base material layer, and the third polymer present as the outermost layer on the other main surface of the base material layer Equipped with antistatic material,
Further if desired
One or more first intermediate layers present between the second polymer-based antistatic material and one main surface of the base material layer, and / or the third polymer-based antistatic material, One or more second intermediate layers existing between the other main surface of the base material layer
A heat press cushioning material comprising:
[2] The buffer material for hot press according to [1], wherein the second polymer antistatic material or the third polymer antistatic material is in a film form.
[3] The buffer material for hot press includes the first intermediate layer and / or the second intermediate layer,
The heat according to [1] or [2], wherein the first intermediate layer or the second intermediate layer is an antistatic or non-static non-film polymer or film polymer. Buffer material for press.
[4] The method according to any one of [1] to [3], further including a fourth polymer-based antistatic material present so as to cover an end face of the buffer material for hot press. Buffer material for heat press.
[5] Any of [1] to [4], wherein the thickness when compressed by pressing 3 MPa in the thickness direction at room temperature is 30 to 90% of the thickness before compression The buffer material for hot presses as described in any one.
[6] Let A be the porosity of the portion located 3 mm inward from the end face,
When the porosity of the portion located at a distance of 100 mm or more inward from the end face is B,
The relationship between the porosity A and the porosity B in one heat-press cushioning material is:
The following formula:
A / B ≧ 0.9
The heat-press cushioning material according to any one of [1] to [5], wherein:
[7] Any of [1] to [6], wherein the antistatic performance as a whole has a charged voltage of 1 kV or less when measured by a method conforming to the measurement method of JIS L 1094. The heat press cushioning material according to one.

Claims (7)

One or more base material layers comprising a fibrous layer composed of a woven fabric or a nonwoven fabric, and a first polymer-based antistatic material present along the surface of the fibers of the fibrous layer, and A second polymer-based antistatic material existing as an outermost layer on one main surface of the base material layer, and a third polymer system existing as an outermost layer on the other main surface of the base material layer With antistatic material,
If desired, one or more first intermediate layers present between the second polymer antistatic material and one main surface of the base material layer, and / or the third polymer A buffer material for hot press comprising one or more second intermediate layers present between the system antistatic material and the other main surface of the base material layer.   The buffer material for hot press according to claim 1, wherein the second polymer-based antistatic material or the third polymer-based antistatic material is in the form of a film. The buffer material for hot press includes the first intermediate layer and / or the second intermediate layer,
3. The hot press according to claim 1, wherein the first intermediate layer or the second intermediate layer is an antistatic or non-antistatic non-film polymer or film polymer. Cushioning material.   The heat press buffer according to any one of claims 1 to 3, further comprising a fourth polymer-based antistatic material present so as to cover an end face of the heat press buffer material. Wood.   5. The thickness when compressed by pressing 3 MPa in the thickness direction at room temperature is 30 to 90% of the thickness before compression. 5. Buffer material for heat press. The void ratio of the portion at a distance of 3 mm from the end face to the inside is A,
When the porosity of the portion located at a distance of 100 mm or more inward from the end face is B,
The relationship between the porosity A and the porosity B in one heat-press cushioning material is:
The following formula:
A / B ≧ 0.9
The heat shock absorbing material according to any one of claims 1 to 5, wherein:   The antistatic performance as a whole has a charged voltage of 1 kV or less when measured by a method based on the measurement method of JIS L 1094. Buffer material for heat press.

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