JP5406002B2 - Thin film laminated sheet for absorbing surface irregularities - Google Patents

Description

  The present invention relates to a thin film laminated sheet for absorbing surface irregularities.

  In the production of rubber thin films used as parts for precision equipment, in the press molding and thermal vulcanization processes, an object 4 such as an unvulcanized rubber film is sandwiched between hot plates 5 as shown in FIG. The method of applying pressure and heat is used. In order to obtain a molded article with smooth surface and excellent dimensional accuracy, it is necessary to uniformize the heat and pressure applied to the object 4 over the entire surface in the hot press. For this purpose, a flat cushion material 3 made of a laminated body in which, for example, the rubber elastic film 1 and the plastic film 2 are in close contact with each other is interposed between the hot platen 5 and the object 4. The heat press is performed in the state of being allowed to go.

Conventionally, as a cushioning material used in combination with a rubber material or a rubber material for a cushioning material, (1) 80% by volume or more of a polyol vulcanized fluororubber component, a vulcanizing agent, a vulcanization accelerator and an acid acceptor Fluorine having a loss tangent (tan δ) value of 0.04 or less by dynamic viscoelasticity measurement at 150 to 250 ° C. as a temperature condition and 1 to 1 × 10 ³ seconds as a frequency condition. Rubber, and manufacturing method thereof (Patent Document 1, Patent Document 2), (2) Two or more fiber material layers, and a binder layer that is positioned between the fiber material layers and joins the upper and lower fiber material layers An upper rubber layer located on the upper surface of the uppermost fiber material layer, a lower rubber layer located on the lower surface of the lowermost fiber material layer, and an upper rubber layer located on the upper surface of the upper rubber layer. Prevents exudation of compounding ingredients contained in A cushioning material for a molding press comprising: an upper bleed-out preventing layer; and a lower bleed-out preventing layer located on the lower surface of the lower rubber layer and preventing the compounding agent contained in the lower rubber layer from oozing out (Patent Document 3) ), (3) Cushioning material for hot press comprising a rubber elastic film and a surface layer material composed of a porous film of a heat resistant resin laminated on at least one surface of the rubber elastic film (Patent Document 4), etc. It has been known.

  However, if the thin rubber elastic film 1 is used to improve the thermal conductivity of the cushion material 3, the pressure applied by the hot platen 5 may become uneven, or the cushion material 3 and the hot platen 5 There is a problem that the unevenness of the cloth material 6, which is a fibrous member interposed between the two, is transferred to the object 4. Further, when the cushion material 3 is repeatedly used, there is a problem that it is difficult to recover the unevenness formed on the surface of the cushion material 3 smoothly.

On the other hand, a thin film sheet is used to protect the surface by attaching to the furniture surface, the housing surface of a home appliance, the surface of an automobile interior / exterior member, etc., or to impart excellent design properties to the surface. .
For example, a hydrogenated styrene-based protective film that is attached to the surface of a liquid crystal display device for the purpose of preventing dust from attaching or scratching during processing, transportation or storage. A self-adhesive layer composed of an elastomer and a propylene-based polymer, an intermediate layer composed of a propylene-ethylene random copolymer, etc., and a non-adhesive layer composed of a propylene homopolymer, etc., are laminated and has a total thickness of 20 to 80 μm. A protective film is known (Patent Document 5).
However, as shown in FIG. 4, the thin film sheet for protecting the surface is provided with a surface protective sheet 3a ′ to which the unevenness 4c ′ present on the surface of the base material 4a or the composite member 4b combined with the surface is bonded. And 3b ′ cannot absorb, and the unevenness 4c ′ appears on the surface. As the film thickness of the conventional thin film sheet is reduced, there is a problem that unevenness on the surface of the member appears on the surface of the sheet, making it difficult to mirror the surface of the member. In particular, there is a problem that it becomes difficult to absorb the irregularities on the surface of the member with a sheet thickness of 1000 μm or less and to make the surface mirror-like.

JP 2000-52369 A JP 2003-31768 A JP-A-8-90577 JP 2003-103552 A JP 2009-67927 A

  The present invention has been made in order to cope with such a problem. Even when the sheet thickness is 1000 μm or less, the present invention can absorb unevenness on the surface of a member and make the surface specular. An object is to provide a thin film laminated sheet.

The thin film laminated sheet for absorbing surface irregularities of the present invention is a laminated sheet for absorbing and smoothing irregularities on the surface of the substrate by sticking or laminating on the surface of the substrate. The thin-film laminated sheet for absorbing surface irregularities is a laminate of at least two films including a rubber elastic film that does not have adhesiveness to the substrate surface. The surface roughness Rz defined in JIS B 0601 of the sheet after the sheet is pasted or laminated is the surface roughness Rz of the base material surface is ~ 300 μm, the thickness of the entire laminate is 20 to 1000 μm It is characterized by being 44 % or less.
The elastic rubber film constituting the laminated sheet has a loss tangent (tan δ) measured at 10 MHz at 24 ° C. in the range of 0.1 to 0.45, and an elastic modulus (E ′) measured at 10 MHz at 24 ° C. Is a rubber composition film having a ratio of elastic modulus to loss tangent (E ′ / tan δ) of 5 to 35.

The rubber composition contains 5 to 45 parts by weight of at least one oily substance selected from petroleum resin synthetic oil and plasticizer with respect to 100 parts by weight of rubber.
The rubber is at least one selected from acrylonitrile butadiene rubber, hydrogenated acrylonitrile butadiene rubber, carboxyl group-containing acrylonitrile butadiene rubber, carboxy group-containing hydrogenated acrylonitrile butadiene rubber, ethylene propylene rubber, ethylene propylene non-conjugated diene rubber, and chloroprene rubber. It is characterized by being rubber.

  The thin film laminate sheet for absorbing surface irregularities of the present invention is a laminate of at least two films selected from a rubber elastic film and a plastic film that do not have adhesiveness to the substrate surface, Since the rubber elastic film has a predetermined elastic modulus and loss tangent, it can absorb the irregularities on the surface of the base material and make the surface mirror-like.

It is sectional drawing of the shaping press apparatus used in order to evaluate smoothness. It is sectional drawing which affixed the surface uneven | corrugated thin film lamination sheet to the base material. It is sectional drawing of a shaping press apparatus. It is sectional drawing which affixed the conventional thin film lamination sheet for surface uneven | corrugated absorption to the base material.

A thin film sheet that can be affixed to furniture surfaces, home appliance housing surfaces, automotive interior / exterior member surfaces, etc., to mirror the surface, or to provide excellent surface smoothness as a cushioning material When the required characteristics were studied, it was found that a composite laminate of a rubber elastic film and a plastic film was excellent.
It has been found that the rubber elastic film has a particularly important relationship between tan δ and E ′, and is excellent in surface smoothness by controlling the range within a predetermined range. Further, it was found that it is important to set the blending ratio of the oily substance to be blended with the rubber within a predetermined range in order to control the tan δ and E ′ within a predetermined range while being excellent in processability. The present invention is based on such knowledge.

The elastic rubber film and plastic film that can be used in the present invention are those that do not have adhesiveness to the substrate surface. By not having adhesiveness, it is considered that the internal stress of the film can be easily dispersed and the unevenness of the substrate surface can be absorbed.
It is important that the substrate has no adhesiveness to the substrate surface and is a laminate of at least two films, and it is preferable that the two films do not have adhesiveness for the above reasons.
As a form of the laminate, there is a form in which (a) two or more identical or different rubber elastic films are laminated, and (c) two or more sheets including a rubber elastic film and a plastic film are laminated. As the form of (c), (c1) the same or different rubber elastic film and the same or different plastic film are alternately laminated one by one, (c2) two or more identical or different rubber elastic films are laminated, Two or more of the same or different plastic films are laminated together, and (c3) the same or different rubber elastic film and the same or different plastic film are randomly laminated.

FIG. 2 shows a state in which the thin film laminated sheet for absorbing surface irregularities absorbs irregularities on the surface of the base material and mirrors the surface. FIG. 2 is a cross-sectional view in which a thin film laminated sheet for absorbing surface irregularities is attached to a substrate.
The thin film laminated sheet for absorbing surface irregularities is composed of rubber elastic film or plastic films 3a, 3b, 3c and 3d. The unevenness 4c existing on the surface of the substrate 4a or the surface of the composite member 4b combined with the surface is absorbed by the thin film laminated sheet for absorbing surface unevenness, and the surface is mirrored.

The thickness of one of the rubber elastic film and the plastic film is 10 to 300 μm, preferably 50 to 250 μm, and the total thickness of the laminate is 20 to 1000 μm, preferably 100 to 500 μm.
If the film thickness is too thin, it is difficult to absorb the irregularities on the substrate surface, and even if the overall thickness exceeds 1000 μm, the irregularities on the substrate surface will not be smoothed any further.

  As the rubber that can be used for the rubber elastic film, a vulcanizing agent or a rubber that can be crosslinked by electron beam irradiation can be used. Examples thereof include natural rubber, butadiene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, ethylene propylene rubber, ethylene propylene non-conjugated diene rubber, acrylic rubber, chloroprene rubber, silicone rubber, and fluorine rubber. Of these, acrylonitrile butadiene rubber is preferred because of its excellent adhesion to plastic films. The rubber can be used alone or as a mixed rubber.

  Examples of the acrylonitrile butadiene-based rubber include acrylonitrile butadiene rubber, hydrogenated acrylonitrile butadiene rubber, carboxyl group-containing acrylonitrile butadiene rubber, and carboxy group-containing hydrogenated acrylonitrile butadiene rubber. Up to nitrile amount can be used.

  The acrylonitrile butadiene rubber preferably has a nitrile amount of 18 to 49% by weight. Here, the amount of nitrile (% by weight) refers to the proportion of acrylonitrile contained in the copolymer. When the amount of nitrile is less than 18% by weight, the tan δ value of the thin rubber elastic film is lowered. As a result, when the film is laminated on a plastic film, the unevenness on the surface of the substrate is absorbed and the unevenness is absorbed when the surface is mirrored. May decrease. On the other hand, when the amount of nitrile exceeds 49% by weight, the thin rubber elastic film is made into a resin, the elastic modulus and the surface hardness are increased, and the unevenness absorbability when laminated on the plastic film may be lowered. Furthermore, the surface migration of the oily substance increases as the amount of nitrile increases.

The acrylonitrile butadiene rubber is preferably compounded with carbon black and / or zinc oxide. By blending carbon black, it is possible to maintain tear resistance, prevention of bending cracks, and decrease in compressive strain as a thin film laminated sheet for absorbing surface irregularities, and thermal conductivity can be imparted by blending zinc oxide. . A preferred blending example is when blending carbon black and zinc oxide.
The mixing ratio of carbon black is 5 to 35 parts by weight, preferably 10 to 25 parts by weight, based on 100 parts by weight of acrylonitrile butadiene rubber. When the carbon black is less than 5 parts by weight, the effect of reinforcing properties is reduced, and when it exceeds 35 parts by weight, the resilience is increased.
Moreover, the compounding ratio of zinc oxide is 1 to 10 parts by weight, preferably 3 to 7 parts by weight based on 100 parts by weight of acrylonitrile butadiene rubber. If the zinc oxide is less than 3 parts by weight, the thermal conductivity will decrease, and if it exceeds 8 parts by weight, the hardness will increase.

  It is preferable to add an oily substance to the acrylonitrile butadiene rubber. This oily substance is liquid at room temperature, and is preferably a substance that can be incorporated into the rubber material without chemically reacting with rubber molecules during the rubber crosslinking reaction. By dispersing in the rubber without chemically reacting with the rubber molecules, the dielectric properties can be maintained within a predetermined range.

Examples of oily substances include petroleum resin synthetic oils and plasticizers. These can be used alone or as a mixture.
The petroleum resin synthetic oil is preferably a substance having a glass transition temperature (Tg) of −40 ° C. to −20 ° C. and a viscosity at 50 ° C. of 0.2 Pa · s to 2 Pa · s.
Examples of petroleum resin synthetic oils include coumarone oil, coumarone indene resin oil, and terpene petroleum resin oil. In the present invention, coumarone indene resin-based oil is preferable, and examples thereof include refined coumarone indene oil, coumarone resin oil, soft coumarone, and liquid coumarone.

  Examples of plasticizers include adipic acid polyesters, sebacic acid polyesters, trimetic acid esters, dipentaerythritol or pyromellitic acid esters, phthalic acid esters, polyether esters, and other plasticizers, phosphate plasticizers. And polyether plasticizers. In the present invention, adipic acid-based polyester is preferable.

  The oily substance is blended in an amount of 0 to 45 parts by weight, preferably 0 to 35 parts by weight, based on 100 parts by weight of the acrylonitrile butadiene rubber. When the amount of the oily substance exceeds 45 parts by weight, the oily substance and the solvent may be separated during preparation of the coating liquid in the coating method, resulting in poor workability during preparation of the coating liquid. On the other hand, when the amount exceeds 45 parts by weight, the surface migration of the oily substance in the rubber elastic film increases.

Further, by adding an oily substance to acrylonitrile butadiene rubber in the above range, the loss tangent (tan δ) measured at 10 MHz at 24 ° C. of the rubber elastic body film after crosslinking is in the range of 0.1 to 0.45, 24 The elastic modulus (E ′) measured at 10 MHz at ° C. can be in the range of 1 to 6 MPa, and the ratio of elastic modulus to loss tangent (E ′ / tan δ) can be 5 to 35.
By optimizing the elastic modulus and loss tangent, the processability of the rubber elastic film is improved, the surface migration of the oily substance is suppressed, and the thin film laminated sheet for absorbing surface irregularities obtained by laminating the plastic film, The smoothness of the substrate surface can be improved.

Rubber elastic films include sulfur and other inorganic vulcanizing agents, sulfur compounds, vulcanizing agents such as organic peroxides or crosslinking agents, vulcanizing accelerators such as guanidine, thiezol and sulfenamide, zinc oxide Metal oxides such as fatty acids and their derivatives or vulcanization accelerators such as diethylene glycol, naphthylamine, diphenylamine, anti-aging agents such as wax, reinforcing agents, bulking agents such as talc, clay and rubber powder, stearic acid, etc. These lubricants and other compounding agents can be appropriately blended.
The rubber elastic body film of the present invention contains acrylonitrile butadiene rubber, carbon black, zinc oxide and an oily substance, and it is preferable to add an anti-aging agent and a lubricant to this.

  The blending ratio of the anti-aging agent is preferably 1 to 5 parts by weight and the blending ratio of the lubricant is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the acrylonitrile butadiene rubber.

The rubber elastic film that can be used in the present invention can be produced by a coating method or a calendering method. Particularly preferred is a coating method capable of easily producing a thin rubber elastic film.
In the coating method, the above rubber composition is mixed with a roll or the like, then dissolved in a solvent, the obtained liquid rubber composition is applied to the surface of the support sheet, and after drying, crosslinked with heat, radiation, electron beam or the like.
The concentration of the rubber composition is preferably 10 to 50% by weight with respect to the total amount of the rubber composition and the solvent, and if it is less than 10% by weight, the coating thickness cannot be obtained. It becomes high and it becomes difficult to apply.
As the above-mentioned solvent, those having a solubility parameter (SP value) of 8.0 to 13.0, for example, toluene, methyl alcohol, cyclohexane, methyl ethyl ketone and methyl isobutyl ketone are preferable. It can be used individually or in mixture of 2 or more types. Further, a non-solvent compatible with the above solvent can be used.

  For dissolving the rubber composition, it is convenient to use a stirrer equipped with a vacuum defoaming device. That is, a rubber composition obtained by kneading rubber and a desired additive in advance with an intermix or a kneader is put into a stirrer equipped with a vacuum defoamer together with a solvent, and stirred and dissolved under atmospheric pressure. Thereafter, an antifoaming agent is added as necessary, and the mixture is stirred under vacuum, preferably under a high vacuum of a gauge pressure of −740 mmHg or more. However, stirring under atmospheric pressure is preferably about 5 to 24 hours, and stirring under vacuum is preferably about 5 to 30 minutes intermittently.

The rubber solution obtained by the above dissolution / stirring is applied to a support film with a predetermined thickness and a predetermined width on a support film having good releasability such as polyethylene terephthalate by a roll coater, comma coater, knife coater, die coater, etc. The Examples of the support film having good releasability include a polyethylene terephthalate film subjected to roughening.
The support film coated with the rubber solution is dried by heating in an oven at a temperature of 40 to 130 ° C., preferably for 1 to 30 minutes. And the rubber elastic body film on the support film obtained by drying is bridge | crosslinked.
For crosslinking, a method using heat, a method using an electron beam, a method using radiation, or the like can be adopted.
In the present invention, since the oily substance may be blended uniformly, the crosslinking is preferably electron beam irradiation. Although the conveyance speed in the case of electron beam irradiation is set according to the intensity | strength of the electron beam to be used, 4-10 m / min is preferable at 100-750 KV and 5-1000 kGy.

In the above method, the defoamed rubber solution is applied on a support film made of polyethylene terephthalate with good dimensional stability by a roll coater, dried, and then crosslinked by electron beam irradiation, so there are no bubbles. A rubber film having a uniform thickness and a relatively wide width can be produced. And since a support film with favorable peelability is used as said support film, peeling after bridge | crosslinking is easy. Moreover, since drying is performed at 40 to 130 ° C., a flat rubber film can be produced without causing irregularities in the support film. Furthermore, since crosslinking is performed by electron beam irradiation and the pressure applied to the rubber film is small, the releasability from the support film is kept good.
The defoamed rubber solution can be applied directly on the resin sheet, dried and crosslinked as described above.

By forming the rubber elastic film as a laminate with a plastic film, a thin film laminated sheet for absorbing surface irregularities can be obtained.
Examples of the plastic film that can be used include a thermoplastic resin film or a thermosetting resin film. Examples of the thermoplastic resin film include films of polyethylene terephthalate, polybutylene terephthalate, polycarbonate, acrylic resin, ABS resin, AS resin, polystyrene, and the like. Moreover, as a thermosetting resin film, films, such as an epoxy resin, a phenol resin, a melamine resin, a urethane resin, an unsaturated polyester resin, can be illustrated.

In the thin film laminated sheet for absorbing surface irregularities of the present invention, the surface roughness Rz defined in JIS B 0601 is 44% or less of the surface roughness Rz of the substrate surface. At this time, the measurement length is 8 mm. Here, the surface roughness Rz of the substrate surface refers to the surface roughness of the substrate surface itself and the surface roughness that appears when the substrate surface is transferred.
For example, when pressing without using a molding press cushion material, the surface roughness of the cloth material inserted between the hot plates is transferred to the surface of the object to be pressed. When a polyester film (manufactured by Toyobo Co., Ltd., trade name E7002 (thickness: 100 μm)) is used as a press object, and fabric 400-22 manufactured by Chuko Kasei Kogyo Co., Ltd. is used as a cloth material, The surface roughness (Rz) becomes 22.29 μm.
On the other hand, when one rubber elastic film or plastic film (thickness 100 μm) is used as a cushioning material, the surface roughness (Rz) after pressing of the object to be pressed becomes 10.10 μm and 18.68 μm, respectively. This value is 45.31% and 83.80% of the surface roughness Rz of the substrate surface, respectively.
However, by using the thin film laminated sheet of the present invention as the cushioning material for molding press, the surface roughness (Rz) of the pressed object after being used once as the cushioning material for molding press may be less than 9.8 μm. it can. That is, it can be 44% or less of the surface roughness Rz of the substrate surface.

  The thin film laminated sheet for absorbing surface irregularities of the present invention is excellent on the surface of a base material as a sheet for absorbing irregularities on the surface of furniture, the housing surface of home appliances, the surface of automobile interior and exterior members, or as a cushioning material for molding presses. Surface smoothness can be imparted.

The materials used in each example and comparative example are shown below. In addition, the inside of a parenthesis shows the case where it uses as an abbreviation in Table 1 and Table 2.
Acrylonitrile butadiene rubber 1 (NBR1 (AN = 49%)): manufactured by Nippon Zeon Co., Ltd., trade name NIPOL DN003
Acrylonitrile butadiene rubber 2 (NBR2 (AN = 41%)): manufactured by JSR Corporation, trade name N220S
Acrylonitrile butadiene rubber 3 (NBR3 (AN = 18%)): Nippon Zeon Co., Ltd., trade name NIPOL DN401
Ethylene propylene rubber (EPDM): manufactured by Mitsui Chemicals, trade name EPT3045
Chloroprene rubber (CR): Denka Chloroprene S-40, manufactured by Denki Kagaku Kogyo Co., Ltd.
Carbon Black: Product name Seast S, manufactured by Tokai Carbon Co., Ltd.
Zinc oxide: manufactured by Inoue Lime Industry Co., Ltd., trade name Meta Z-60
Oily substance 1 (coumarone-indene resin-based oil): manufactured by Kobe Oil Chemical Co., Ltd., trade name KG Hisoft Oily substance 2 (ester plasticizer): manufactured by ADEKA Corporation, trade name ADEKA Sizer PN6120
Anti-aging agent: Seiko Chemical Co., Ltd., trade name Non-Flex RD
Lubricant: manufactured by Kao Corporation, trade name LUNAX 150
Polyester film (F1): manufactured by Toyobo Co., Ltd., trade name E7002 (thickness: 100 μm)

Rubber elastic body examples R1 to R8 and comparative rubber elastic body example R9
Each raw material shown in Table 1 was compounded with each compounding agent shown in Table 1, kneaded with an intermix machine (kneader), a 6 mm thick sheet was dispensed, and this sheet was cut into 1 cm square pieces. . The obtained fine pieces were weighed so that the weight ratio with respect to toluene and methyl isobutyl ketone (MIBK) was 30% by weight and charged into a stirrer with a vacuum deaerator together with toluene and methyl isobutyl ketone (MIBK). Under stirring for 12 hours, the above-mentioned fine pieces are dissolved in toluene and methyl isobutyl ketone (MIBK). After that, an emulsion type silicone oil (made by Toray Dow Corning Co., Ltd. 5 parts by weight of Form F-161 ") was charged, the vacuum deaerator was driven, and the mixture was further stirred for 20 minutes under a vacuum of gauge pressure -750 mmHg to degas.

Next, the above-dissolved and defoamed rubber solution (solid content rate 30%, viscosity 9 Pa · s) is supplied to a roll coater, and the surface of the polyethylene terephthalate film is roughened (Toyobo Co., Ltd.) Manufactured product name “TN200”) at a speed of 2 m / min, the rubber solution was applied to the surface so that the solid content was 100 g / m ^2, and then introduced into an oven at 90 ° C. And dried for 20 minutes, and then continuously led to an electron beam irradiation device, irradiated with an electron beam twice under the conditions of 200 KV and 100 kGy, and then a rubber elastic film (thickness 100 μm) was rolled while peeling the support film. Rolled up.

The rubber elastic body film thus obtained was measured for hardness, tensile strength, elongation, 100% modulus, elastic modulus, and loss tangent.
Hardness was measured according to JISK6252. Tensile strength, elongation, and 100% modulus were measured according to JIS K6251 method.
The elastic modulus and loss tangent were measured by using a dynamic viscoelasticity measuring instrument (DVA225, manufactured by IT Measurement Control Co., Ltd.) using a sample piece of 5 mm width × 30 mm length (distance between chucks) by a pulling method. The measurement was performed at a frequency of 10 MHz and a measurement temperature of 24 ° C. The results are shown in Table 1.

Examples 1 to 12 and Comparative Examples 1 to 4
Using the rubber elastic film obtained in the rubber elastic body example and the comparative rubber elastic body example and the polyester film, a thin film laminated sheet for absorbing surface irregularities was produced. Note that Example 12 is a reference example. The laminated sheets were brought into close contact with each other by nip rolls. This sheet was used as a cushioning material for a molding press. In the configuration of the cushion material, the first layer is located on the object 4 side shown in FIG.
The obtained cushion material 3 for molding press was sandwiched between the hot plates 5 in the arrangement shown in FIG. FIG. 1 is a cross-sectional view of a molding press apparatus used for evaluating smoothness. The object 4 used was E7002 (thickness 100 μm) manufactured by Toyobo Co., Ltd., and the fabric material 6 was a fabric 400-22 manufactured by Chuko Kasei Kogyo Co., Ltd. 20 minutes. After the molding press, the surface roughness of the surface 3a of the cushion material 3 was measured. The measurement results are shown in Table 2.
As for the surface roughness, an arithmetic average roughness (Ra), an arithmetic maximum roughness (R max ), and a maximum height (Rz) specified in JIS B 0601 were measured. The measurement length is 8 mm.

    The thin film laminated sheet for absorbing surface unevenness of the present invention can absorb unevenness on the surface of the base material and make the surface mirror surface even if it is a thin film. It can be used to mirror the surface of a member. Moreover, the surface can be protected and the design property excellent in the surface can be provided.

DESCRIPTION OF SYMBOLS 1 Rubber elastic body film 2 Plastic film 3 Cushion material 4 Object 5 Heating board 6 Cloth material

Claims (4)

A thin film laminated sheet for absorbing surface irregularities for absorbing and smoothing irregularities on the surface of the base material by pasting or laminating on the surface of the base material,
The thin film laminate sheet for absorbing surface irregularities is a laminate of at least two films including a rubber elastic film that does not have adhesiveness to the surface of the base material. 10 to 300 μm, the thickness of the entire laminate is 20 to 1000 μm, and the surface roughness Rz defined in JIS B 0601 of the sheet after the sheet is attached or laminated is the surface roughness Rz of the substrate surface 44% or less of
The rubber elastic film has a loss tangent (tan δ) measured at 10 MHz at 24 ° C. in the range of 0.1 to 0.45, and an elastic modulus (E ′) measured at 10 MHz at 24 ° C. of 1 to 6 MPa. A rubber composition film having a range and a ratio (E ′ / tan δ) of the elastic modulus to the loss tangent of 5 to 35,
The rubber composition is at least selected from acrylonitrile butadiene rubber, hydrogenated acrylonitrile butadiene rubber, carboxyl group-containing acrylonitrile butadiene rubber, carboxy group-containing hydrogenated acrylonitrile butadiene rubber, ethylene propylene rubber, ethylene propylene non-conjugated diene rubber, and chloroprene rubber. A thin film laminated sheet for absorbing surface irregularities, which is a rubber composition comprising a single rubber.   2. The surface irregularity absorbing material according to claim 1, wherein the rubber composition contains 5 to 45 parts by weight of at least one oily substance selected from petroleum resin synthetic oil and plasticizer with respect to 100 parts by weight of rubber. Thin film laminated sheet.   The thin film laminated sheet for absorbing surface irregularities according to claim 1 or 2, wherein the laminate of the films includes a plastic film. The thin film laminated sheet for absorbing surface irregularities according to any one of claims 1 to 3, wherein the laminated body of the films is a laminated body of three films.

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