KR20030034000A - Elastic body and heat proof cushion material for molding press containing the same - Google Patents

Abstract

PURPOSE: To obtain an elastomer maintaining quality without generating bleeding even when used under high temperature and high pressure conditions. CONSTITUTION: This elastomer contains an elastic material and an additive for absorbing components bled from the elastomer by heating and/or compression.

Description

Elastic body and heat-resistant cushioning material for press molding containing same {Elastic body and heat proof cushion material for molding press containing the same}

The present invention relates to an elastic body and a heat proof cushioning material for press molding containing the same.

The heat-resistant buffer material for press molding is formed of a paper phenol laminate or a glass epoxy laminate for a printed circuit board, or a flat panel sheet (prepreg made of a resin) containing synthetic resin as a main component in a building cosmetic plywood such as melamine resin or phenol resin, and a molding material. It is used in the liquid crystal cell assembly process in recent years.

In general, the heat-resistant cushioning material for press molding used in these materials absorbs irregularities, deformations, and irregularities in thickness of a hot plate or a mirror plate and transmits equal pressure and heat to the entire surface of the molded prepreg (B stage state). It plays an important role. That is, in the hot press process, since the prepreg temporarily decreases in viscosity by heating and becomes a liquid state by heat, curing proceeds gradually, so that heat and pressure are uniformly transferred from the hot plate to the front surface of the prepreg sheet during molding. A metal mirror plate is arranged on each prepreg sheet surface via a release film or copper foil, and a buffer material is interposed between the hot plate and the metal mirror plate.

Conventionally, as a buffer material, a plurality of buffer papers such as craft paper or the like have been superimposed on the molding conditions, but since they are subjected to heat and pressure during use, the pulp is damaged and receded. The strict one could only be used once. For this reason, it was necessary to replace the craft paper every time or to calculate and prepare the required number of sheets according to the molding conditions. Furthermore, setting the press machine was not a machine. In addition, it is necessary to reconsider the expanded craft paper, and it is necessary to adjust the air without being influenced by the outside air (temperature) while it is in stock, which requires considerable labor. In addition, paper powder was scattered from the cut surface of the craft paper, there was a problem that adversely affect the product.

For this reason, instead of craft paper, a buffer material composed of rubber-based buffer material and aromatic polyamide fiber laminated with heat-resistant fibers was integrated into the needle punching, and the number of times of use varies depending on the molding conditions. You can use it.

The buffer material which laminated | stacked and integrated the heat resistant fiber, such as an aramid fiber and aromatic aramid fiber mainly by needle punching, can endure using it repeatedly under high temperature, high pressure. However, with the recent miniaturization, high performance, and rapid spread and miniaturization of computers, the performance and quality required for printed circuit boards have become more stringent.

In connection with this, the cushioning material of the rubber main body can be used with a very good cushioning property at the beginning of use. However, since the rubber is drastically receded by repeated use under high temperature and high pressure, the amount of shock absorbing rapidly decreases, and defective products are generated in the laminate. There was a concern. In recent years, quality that has not been a problem in the past cannot be used because the quality of the required quality cannot be satisfied due to an increase in the number of wirings between the pins.

On the other hand, the felt-like buffer material laminated with heat-resistant fibers such as aromatic polyamide fibers and integrated integrally by needle punching can withstand repeated use under high temperature and high pressure. Due to the occurrence of a pattern in the form of a 로 pattern to the buffer material due to the resin flow of the molded article and a decrease in the buffer amount of the felt-like buffer material itself, the uniformity against the prepreg gradually becomes poor, and the minor surface of the laminated plate which has not been a problem in the past. The unevenness cannot satisfy the increasing demand of the number of wirings in the pins of the wiring board in recent years, and this causes the shock absorbing material to become the life of the product.

In recent years, with the phenomenal increase in sales of personal computers in the form of notebook computers, the following drawbacks are also pointed out in "fluorine rubber" and "silicone sponge", which are heat-resistant cushioning materials for press molding used in the cell assembly process of liquid crystal panels.

Fluorine rubber generates toxic gases, which makes it impossible to incinerate after use.Silicone sponges can only be used several times, resulting in high operating costs. However, there is a problem that oil repellency has an undesirable effect on the product.

In order to achieve the high quality required for the above laminate, the present inventor has made a whole-hearted study, introducing the advantages of the cushioning material of the rubber main body and the advantages of the felt buffer material using heat-resistant fibers, to maintain appropriate voids in the rubber layer of the core material, A new type of cushioning material has been developed and patented that can maintain the uniformity and stable temperature rising against prepreg for a long time (Japanese Patent Application No. 2000-283715).

However, the above-mentioned buffer material is rich in the buffer amount to achieve the high quality required for the laminated board at the beginning of use, and can exhibit uniformity against the prepreg and stable temperature increase. (Preventive agent) and the like (hereinafter referred to as `` bleed '') and clogging of voids were observed, and the quality of the molded product was satisfactory, but there was a problem in use recovery.

Therefore, the subject of this invention is solving the said problem and providing the elastic body which quality is maintained, even when using under high temperature, high pressure, without generating a bleed.

1 is a cross-sectional view showing an embodiment of a heat-resistant cushioning material for press molding of the present invention (the base material is not in the elastic material).

Figure 2 is a cross-sectional view showing another embodiment of the heat-resistant cushioning material for press molding of the present invention (the elastic material contains a base fabric).

3A and 3B are cross-sectional views showing another embodiment of the heat-resistant cushioning material for press molding of the present invention.

(a): There is no base fabric in the elastic body, and the heat resistant sheet material is stuck on both sides of the felt

(b): There is no base fabric in the elastic body, and the heat resistant sheet material is attached to one side of the felt

4A and 4B are sectional views showing another embodiment of the heat-resistant buffer material for press molding of the present invention.

(a): Elastic fabric with base fabric, heat resistant sheet material on both sides of felt

(b): base fabric in elastic body, heat resistant sheet material on one side of felt

5A, 5B, and 5C are cross-sectional views of an elastic body, a felt, a heat-resistant adhesive sheet, and a heat-resistant sheet of the heat-resistant buffer material for press molding of the present invention.

6 is a cross-sectional view of a conventional product having no voids in the elastic body.

** Description of the symbols for the main parts of the drawings **

1: present invention

2: Rubber containing porous material with voids dispersed to a moderate degree

3: heat resistant adhesive sheet 4: heat resistant base fabric of felt-like cushioning material

5: heat resistant batt fiber layer of felt-like buffer material

6: felt buffer

7: Resin-processed product in which resin is impregnated into heat-resistant woven fabric or nonwoven fabric so that voids are maintained to an appropriate level

8: Heat resistant woven fabric, heat resistant paper, heat resistant film

9: rubber without voids

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, in order to solve the said subject, while this research is carried out wholeheartedly, the additive which makes it adsorb | sucking antioxidant (antioxidant) which is a component which can bleed by heating and / or pressurization from an elastic body is added, As a result, it has been found that the above problems can be solved, and the present invention has been completed.

That is, the present invention relates to an elastic body containing an elastic material, wherein the elastic body contains an additive in the elastic body for adsorbing a component that can be bleeded from the elastic body by heating and / or pressing.

Moreover, this invention relates to the elastic body characterized by the elastic material being heat resistant.

The present invention relates to an elastic body, characterized in that the glass transition point of the elastic material is below room temperature.

The present invention relates to an elastic body, wherein the elastic material is rubber.

The present invention relates to an elastic body characterized in that the porous material having a plurality of pores in which the elastic material is dispersed.

The present invention relates to an elastic body characterized in that the additive is one or two or more porous materials selected from the group consisting of diatomaceous earth, calcium silicate and activated carbon.

The present invention relates to an elastic body, characterized in that the amount of the additive added is in the range of 5 wt% to 50 wt% with respect to the weight of the elastic material.

The present invention relates to an elastic body, characterized in that the elastic material is expanded in the thickness direction in accordance with the temperature rise during the molding process to maintain the voids.

The present invention relates to an elastic body further comprising a heat resistant woven fabric and / or a nonwoven fabric.

The present invention relates to a heat-resistant shock absorbing material for press molding, characterized in that the elastic body is contained as a core material.

The elastic body of this invention containing the additive which adsorb | sucks to a bleed component is a thing which bleed does not generate | occur | produce under high temperature, high pressure, because an additive captures these components. In addition, the elastic body of the present invention exhibits not only a bleeding prevention effect by adsorption but also a solid solid additive present in the elastic body and around the voids in the elastic body, thereby exhibiting a structural reinforcing effect, and also for repeated pressurization and heating. The shape can be maintained without damaging the elastic body and the voids of the elastic body.

The heat-resistant cushioning material for press molding according to the present invention improves the rigidity of the cushioning material by using the above-mentioned elastic body, and maintains the void even under the press, so that the thickness is also maintained and a sufficient buffering amount can be maintained for a long time. In addition, in the heat-resistant buffer material for press molding according to the present invention, when a material having a glass transition point of less than or equal to room temperature is used, a flexible rubbery state can be maintained in the entire temperature range during the heating molding process, so that the irregularities of the hot plate and the mirror plate are By absorbing deformation, irregularity of thickness, etc., it is possible to transmit the uniform pressure to the front surface of the molded prepreg for a long time and can cope with the production of high quality products. The felt-like cushioning material obtained by integrating the elastic body with the felt-like cushioning material can be adjusted by changing the unit amount (basic weight), but the temperature variation in the hot plate is corrected by maintaining the voids in the elastic body. It is possible to transfer a uniform amount of heat to the prepreg.

Next, embodiments of the present invention will be described.

The elastic material used in the present invention has heat resistance and is formed under press molding conditions (for example, molding conditions of glass epoxy laminates, temperature: 180 to 210 ° C, pressure: 30 to 50 kg / cm 2, and molding of paper-phenol laminates). Conditions, temperature: 160-190 degreeC, pressure: 80-120 kg / cm <2>, press conditions of a liquid crystal cell assembly process, temperature: 160-180 degreeC, pressure: 3-5 kg / cm <2>) If it is possible to use, what kind of material is used You may. It is also preferable that the glass transition point is equal to or less than room temperature because it is a flexible rubber phase in the entire temperature range during the heat molding process, and it is preferable to expand in the thickness direction in accordance with the rise in temperature during the heat molding process, since it maintains the voids in the elastic body. Do. As such an elastic material, polyisoprene rubber, styrene butadiene rubber, polybutadiene rubber, chloropyrene rubber, acrylonitrile butadiene rubber, hydrogenated nitrile rubber, carboxylated nitrile rubber, butyl rubber, ethylene propylene rubber, acrylic rubber, fluorine Rubbers, silicone rubbers, chlorosulfonated polyethylene rubbers, chlorinated polyethylene rubbers, epichlorohydrin rubbers and the like, and copolymers and mixtures of a plurality of materials selected from these are preferred.

The thickness of the elastic material, the size of the voids, and the porosity are appropriately selected by the amount of buffer required according to the thickness precision of the hot plate, the thickness precision of the prepreg, and the thickness precision required for the copper clad laminate to be molded. For example, the thickness is preferably in the range of 0.3 to 5.0 mm, the size of the void is preferably 20 to 200 µm, more preferably 50 to 150 µm, and the porosity is preferably 5 to 80%, 10 The range of -60% is more preferable.

In the elastic body of the present invention, any additive that makes the component capable of bleeding from the elastic body by heating can be used as long as it has heat resistance and achieves the effect of the present invention. For example, diatomaceous earth calcium Porous materials, such as silicate and activated carbon, are preferable.

The addition amount of the additive is used in consideration of the sufficient adsorption effect and the sheet formability and buffering amount of the elastic body, for example, the range of 5wt% to 50wt% with respect to the weight of the elastic material is preferred, more preferably 5wt% to 40wt% Range.

The elastic body of the present invention may contain an antioxidant (antioxidant), silica, carbon black, a vulcanizing agent, and the like, and as a component that usually bleeds by heating, typically, a substituent phenylamine (Naugard445 (Uniroyal Chem)). And anti-oxidants (antioxidants) such as non-flex DCD (hole chemical).

Moreover, the elastic body of this invention can be put in the method of impregnating a heat resistant woven fabric or a nonwoven fabric as needed for the dimensional stability in use, and the improvement of the holding force of foam | bubble. As a material of a heat resistant woven fabric and a nonwoven fabric, glass fiber, PBO fiber, and aromatic polyamide fiber are used.

In obtaining the elastic body of this invention, the said additive is added to an elastic material, and a plastic foaming agent is disperse | distributed uniformly in a heat resistant elastic material. The elastic body of this invention can be obtained by making it vulcanize after making this sheet into a fixed thickness.

When the elastic body of the present invention is used as a heat-resistant cushioning material for press molding, it is possible to use the elastic body as it is, but on both sides, one side or the middle, the main raw material is a base fabric and a batt composed of heat-resistant fibers such as aromatic polyamide fibers. It is also possible to attach a felt-like buffer material having a batt) fiber layer to be used as a core material.

Such felt-like cushioning material containing heat-resistant fibers is preferable because it allows the adjustment of the temperature increase rate during press molding by changing the unit amount.

Heat-resistant fibers used in base fabrics and batts, under high-temperature, high-pressure press molding conditions (for example, molding conditions for glass epoxy laminates, temperature: 180-210 ° C., pressure: 30-50 kg / cm 2, paper-phenol laminates) Molding condition, temperature: 160 ~ 190 ℃, pressure: 80 ~ 120kg / ㎠, press condition of liquid crystal cell assembly process, temperature: 160 ~ 180 ℃, pressure: 3 ~ 5kg / ㎠) Although any fiber may be used, it can be suitably selected from an aliphatic polyamide fiber, polyethylene terephthalate fiber, a polyphenylene sulfite fiber, a polyether ether ketone fiber, an aromatic polyamide fiber, etc., for example.

Bonding of the elastic body and felt-like buffer material of this invention uses a heat resistant adhesive film if it is after vulcanization of an elastic material, and if it is before vulcanization, it combines by vulcanization and press-processes.

In addition, when a felt-like cushioning material is stuck on both sides, one side, or the middle, if necessary, heat-resistant sheet material such as heat-resistant paper, heat-resistant woven fabric, heat-resistant film, metal foil, etc. may be applied to the surface of the felt-like buffering material by heat-resistant adhesive or heating and pressing. It is possible to join using self adhesiveness. In this case, the heat-resistant sheet material becomes a film to block aeration, so that automatic conveyance by suction pads that cope with labor savings is possible, as well as prevention of hair loss on the surface of the felt-like buffer material and prevention of hair loss. We can plan.

EMBODIMENT OF THE INVENTION Hereinafter, although the elastic body of this invention and the heat-resistant buffer material for press molding are demonstrated in detail using an Example, this is not any limitation of this invention.

<Example 1>

The glass transition point is ethyleneacryl rubber, an elastic rubber material that expands in the thickness direction as the temperature rises during the heat forming process below room temperature, so that the voids are dispersed to a moderate degree in diatomaceous earth (trade name: radiolight) and rubber, which is 5 wt%. The plastic foaming agent is mixed to make an elastic (rubber) sheet having a thickness of 1.0 mm to be a core material. By placing felt buffers made of heat-resistant fibers of aromatic polyamide having an area weight of 450 g / m 2 on both sides, and adjusting the thickness by inserting a gauge during hot press processing (adhesive conditions: 200 ° C., 10 kg / cm 2, 15 minutes, Gauge: 3.0 mm) and 40% of porosity were secured, the elastic body and the felt buffer material were bonded together, and the heat-resistant buffer material for press molding using the elastic body of this invention of area weight 2000g / m <2> was obtained.

<Example 2>

The glass transition point is mixed with ethylene acrylic rubber, an elastic rubber material which expands in the thickness direction as the temperature rises during the heating molding process below room temperature, and the plastic foaming agent is mixed so that the voids are dispersed to a suitable degree in the rubber and rubber of 30wt%. An elastic (rubber) sheet having a thickness of 1.0 mm is made. By placing felt buffers made of heat-resistant fibers of aromatic polyamide having an area weight of 450 g / m 2 on both sides, and adjusting the thickness by inserting a gauge during hot press processing (adhesive conditions: 200 ° C., 10 kg / cm 2, 15 minutes, Gauge: 3.0 mm) and 40% of porosity were secured, the elastic body and the felt buffer material were bonded together, and the heat-resistant buffer material for press molding using the elastic body of this invention of area weight 2190g / m <2> was obtained.

<Example 3>

The glass transition point is mixed with a plastic foaming agent to disperse the pores in an appropriate amount of 50% by weight of radiolite and rubber in ethylene acrylic rubber, an elastic rubber material which expands in the thickness direction as the temperature rises during the heating molding process to below room temperature. An elastic (rubber) sheet having a thickness of 1.0 mm is made. By placing felt buffers made of heat-resistant fibers of aromatic polyamide having an area weight of 450 g / m 2 on both sides, and adjusting the thickness by inserting a gauge during hot press processing (adhesive conditions: 200 ° C., 10 kg / cm 2, 15 minutes, Gauge: 3.0 mm) and 40% of porosity were secured, the elastic body and the felt buffer material were bonded together, and the heat-resistant buffer material for press molding using the elastic body of this invention of area weight 2250g / m <2> was obtained.

<Example 4>

The glass transition point is mixed with a plastic foaming agent so that the voids are dispersed to a moderate degree in ethylene acrylic rubber, an elastic rubber material which expands in the thickness direction as the temperature rises during the heat-forming process below room temperature, and in the rubber and rubber of 15wt%. An elastic (rubber) sheet having a thickness of 0.5 mm is made. By placing felt buffers made of heat-resistant fibers of aromatic polyamide having an area weight of 450 g / m 2 on both sides, and adjusting the thickness by inserting a gauge during hot press processing (adhesive conditions: 200 ° C., 10 kg / cm 2, 15 minutes, Gauge: 2.5 mm) and porosity 20% were ensured, and the elastic body and the felt buffer were bonded together, and the heat-resistant buffer material for press molding using the elastic body of this invention of area weight 1485 g / m <2> was obtained.

Example 5

The glass transition point is mixed with a plastic foaming agent so that the voids are dispersed to a moderate degree in a 30 wt% radiolight and rubber in an fluoroacryl rubber, which is an elastic rubber material that expands in the thickness direction as the temperature rises during the heating molding process below room temperature. An elastic (rubber) sheet having a thickness of 1.0 mm is made. By placing felt buffers made of heat-resistant fibers of aromatic polyamide having an area weight of 450 g / m 2 on both sides, and adjusting the thickness by inserting a gauge during hot press processing (adhesive conditions: 200 ° C., 10 kg / cm 2, 15 minutes, Gauge: 3.0 mm) and 40% of porosity were secured, the elastic body and the felt buffer material were bonded together, and the heat-resistant buffer material for press molding using the elastic body of this invention of area weight 2150g / m <2> was obtained.

Comparative Example 1

The glass transition point is mixed with ethylene acrylic rubber, an elastic rubber material which expands in the thickness direction as the temperature rises during the heating molding process to below room temperature, and the plastic foaming agent is mixed so that the voids are dispersed in the rubberite and rubber of 3wt% to an appropriate degree. An elastic (rubber) sheet having a thickness of 1.0 mm is made. By placing felt buffers made of heat-resistant fibers of aromatic polyamide having an area weight of 450 g / m 2 on both sides, and adjusting the thickness by inserting a gauge during hot press processing (adhesive conditions: 200 ° C., 10 kg / cm 2, 15 minutes, Gauge: 3.0 mm) and 40% of porosity were ensured, the elastic body and the felt buffer material were bonded together, and the heat-resistant buffer material for press molding of an area weight of 1990 g / m <2> was obtained.

Comparative Example 2

The glass transition point is mixed with a plastic foaming agent to disperse the pores in an appropriate amount of 55% by weight of radiolight and rubber in ethylene acrylic rubber, an elastic rubber material which expands in the thickness direction as the temperature rises during the heating molding process below room temperature. An elastic (rubber) sheet having a thickness of 1.0 mm is made. By placing felt buffers made of heat-resistant fibers of aromatic polyamide having an area weight of 450 g / m 2 on both sides, and adjusting the thickness by inserting a gauge during hot press processing (adhesive conditions: 200 ° C., 10 kg / cm 2, 15 minutes, Gauge: 3.0 mm) and a porosity of 40%, while a heat-resistant buffer material for press molding having an area weight of 2260 g / m 2 was obtained by bonding an elastic body and a felt buffer material together.

Comparative Example 3

An elastic body having a thickness of 1.0 mm that becomes a core material by mixing a plastic foaming agent such that the glass transition point is dispersed at an appropriate temperature in a fluoroacryl rubber, an elastic rubber material which expands in the thickness direction as the temperature rises during the heating and molding process below room temperature. ) Make a sheet. By placing felt buffers made of heat-resistant fibers of aromatic polyamide having an area weight of 450 g / m 2 on both sides, and adjusting the thickness by inserting a gauge during hot press processing (adhesive conditions: 200 ° C., 10 kg / cm 2, 15 minutes, Gauge: 3.0 mm) and 40% of porosity were secured, the elastic body and the felt buffer material were bonded together, and the heat-resistant buffer material for press molding of an area weight of 2180 g / m <2> was produced.

Tables 1 and 2 show the results of evaluation of physical properties and performance of Examples 1 to 5, which are examples of the present invention, and Comparative Examples 1 to 3, which are existing products.

Table 1: Properties of Examples and Comparative Products Core material Radio Light (wt%) Porosity (%) Thickness (mm) Area weight (g / ㎡) Rubber + Radio Light (g / ㎡) Felt (g / ㎡) Example 1 Ethylene acrylic 5 40 3 2000 1100 900 Example 2 Ethylene acrylic 30 40 3 2190 1290 900 Example 3 Ethylene acrylic 50 40 3 2250 1350 900 Example 4 Ethylene acrylic 15 20 2.5 1485 585 900 Example 5 Fluorine Acrylic 30 40 3 2150 1250 900 Comparative Example 1 Ethylene acrylic 3 40 3 1990 1090 900 Comparative Example 2 Ethylene acrylic 55 40 3 2260 1360 900 Comparative Example 3 Fluorine Acrylic 0 40 3 2180 1280 900

Table 2: Durability Test Results Bleed state ※ 2 Void maintenance state ※ 3 Number of presses ※ 1 Number of presses ※ 1 50 times 100 times 300 times 500 50 times 100 times 300 times 500 Example 1 ○ ○ ○ ○ ○ ○ ○ ○ Example 2 ○ ○ ○ ○ ○ ○ ○ ○ Example 3 ○ ○ ○ ○ ○ ○ ○ ○ Example 4 ○ ○ ○ ○ ○ ○ ○ ○ Example 5 ○ ○ ○ ○ ○ ○ ○ ○ Comparative Example 1 ○ × × × ○ × × × Comparative Example 2 Difficult to process sheet Difficult to process sheet Comparative Example 3 ○ ○ ○ ○ ○ × × ×

※ 1. Repeat press condition: The press was repeatedly performed at 200 ° C. and 40 kg / cm 2 to evaluate the bleed state and void retention.

1 cycle: Temperature 15 minutes ⇒ Duration 45 minutes ⇒ Heating and cooling 15 minutes ⇒ Depressurization and opening ⇒ Repeat 15 minutes

※ 2. Bleed state

(Circle): The state which there is no change in the felt surface and can be used without a problem.

X: The state in which the bleeding component began to scatter on the felt surface

※ 3. Air gap maintenance

(Circle): The state in which the space | gap inside a rubber is maintained compared with new product

X: The air gap is damaged compared with the new product

※ 4. Bubble diameter constituting air gap controls the foaming state by gauge thickness during press working.

Although the Example has the structure which bonded the felt buffer material to both surfaces of an elastic body, it is not necessarily limited to this, It is good also to bond a felt buffer material only to the single side | surface of an elastic body.

In addition, contrary to the embodiment, it is also possible to sandwich the felt buffer material with an elastic body.

In addition, in the case where dimensional stability is strongly required, a woven or nonwoven fabric having heat resistance in the rubber layer which is an elastic body may be used.

As shown in Table 1 and Table 2, when the amount of the additive for adsorbing the bleed component such as radiolight to the elastomer of the ethylene acrylic rubber of the present invention is 5% to 50%, it is possible to effectively prevent bleeding under high temperature and high pressure. Can be.

When the amount of the additive is 5% or less, the elastic body does not absorb all of the bleeding components, premature bleeding is observed. On the contrary, when the amount of the additive is more than 50%, the rubber sheet is difficult to form.

In addition, the additive not only adsorbs the bleed component, but also exerts a structural reinforcing effect in the elastic body, and thus it is possible to maintain its shape without damaging the pores dispersed to the elastic body to an appropriate degree. This is clarified by the presence or absence of an additive in the fluoroacryl rubber. That is, since the fluorine acrylic rubber does not contain an anti-aging agent, the expression of the bleed is regardless of the presence or absence of an additive, but the state of maintenance of the voids shows a big difference.

Claims (10)

An elastic body containing an elastic material, wherein the elastic body contains an additive in the elastic body for adsorbing a component capable of bleeding from the elastic body by heating and / or pressing. The method of claim 1, An elastic body, wherein the elastic material is heat resistant. The method according to claim 1 or 2, The glass transition point of an elastic material is room temperature or less, The elastic body characterized by the above-mentioned. The method according to any one of claims 1 to 3, An elastic body, wherein the elastic material is rubber. The method according to any one of claims 1 to 4, An elastic body is an elastic body characterized by being porous having a plurality of dispersed voids. The method according to any one of claims 1 to 5, An elastic body, characterized in that the additive is one or two or more porous materials selected from the group consisting of diatomaceous earth, calcium silicate and activated carbon. The method according to any one of claims 1 to 6, An elastic body, wherein the amount of the additive is in the range of 5 wt% to 50 wt% with respect to the weight of the elastic material. The method according to any one of claims 1 to 7, An elastic material characterized in that the elastic material expands in the thickness direction as the temperature rises during the molding process to maintain the voids. The method according to any one of claims 1 to 8, An elastic body further comprising a heat resistant woven fabric and / or a nonwoven fabric. A heat-resistant cushioning material for press molding comprising the elastic body according to claim 1 as a core material.