JP2003261776A - Silicone gel composition and mattress - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silicone gel composition for a cushion, capable of maintaining good gel state even when the ratio of the liquid component is high, having softness and cushion properties suitable for cushions such as beddings, sofas and seat cushions, hardly causing liquid spill and having a light weight. <P>SOLUTION: This silicone gel composition comprises [A] 3-39 mass% gel skeleton obtained by silylation of a hydrosilicone (a-1) represented by the formula (I) with a trialkenylisocyanurate (a-2), [B] 50-90 mass% liquid component and [C] 1-10 mass% micro hollow sphere. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a silicone gel composition and a mattress, and more specifically, bedding,
The present invention relates to a silicone gel composition which can be suitably used as a cushioning material for sofas, cushions, etc., particularly as a cushioning material for mattresses for bedding.

[0002]

2. Description of the Related Art Conventionally, as cushion materials, cotton, rubber,
Various materials of foamed resin such as urethane foam, members using springs, and composite members of these are known,
It has a hardness and resilience according to each application. In recent years, so-called water beds, in which water is injected into an outer bag, as a cushioning material that constitutes a mattress for beddings, sofas, seat cushions, etc., on which a human body rides or leans, particularly a bedding mattress. (Water mat) is proposed.
According to this water bed, the body pressure of a reclining user is evenly distributed to obtain an ideal sleeping comfort, and its use is expected.

However, a cushion material, such as a water bed, which uses a liquid (water) injected inside is very heavy as compared with other cushion materials, and liquid leakage is likely to occur due to damage to the outer bag or the like. There is a problem.
In addition, if the outer bag is made strong in order to prevent liquid leakage, it is not possible to obtain the comfort characteristic of a water bed. For these reasons, the cushion material that uses the liquid injected inside is not convenient and has not been widely used.

On the other hand, as a material capable of uniformly dispersing impact and pressure, there is known a silicone gel in which a skeleton (gel skeleton) made of a crosslinked polysiloxane is impregnated with a liquid.

[0005]

Therefore, it is conceivable to use silicone gel as a cushion material for bedding, sofas, seat cushions and the like. However,
The conventional silicone gel used to disperse impact and pressure does not have softness suitable as a cushioning material for bedding and the like. Further, in order to impart a suitable softness to the silicone gel, the gel state is maintained by reducing the number of cross-linking points of the polysiloxane cross-linked body constituting the gel skeleton or increasing the ratio of the liquid component impregnated in the gel skeleton. In addition to not being able to obtain a suitable cushioning property, there is a problem of liquid leakage, and the weight is almost the same as that of the water bed.

The present invention has been made based on the above circumstances. An object of the present invention is to maintain a good gel state even if the proportion of liquid components is high, and to have a suitable softness and cushioning property as a cushioning material for bedding, sofas, seat cushions, etc. to prevent liquid leakage. It is an object of the present invention to provide a silicone gel composition for a cushioning material that is hard to generate and is lightweight. Another object of the present invention is to
It is to provide a mattress for bedding that has suitable softness and cushioning properties, is resistant to liquid leakage, and is lightweight.

[0007]

In order to solve the above-mentioned problems, as a result of intensive studies by the present inventors, a liquid component and fine hollow spheres were dispersed in a gel skeleton composed of a specific polysiloxane crosslinked body. It was found that a silicone gel composition having suitable softness and cushioning property, less likely to cause liquid leakage, and lightweight can be obtained by (impregnation with a dispersion liquid of fine hollow spheres), and based on such findings The present invention has been completed.

That is, the silicone gel composition of the present invention comprises [A] a hydrosilicone (a-1) represented by the following general formula (1) and a trialkenyl isocyanurate (a).
-2) containing 3 to 39% by mass of a gel skeleton obtained by a hydrosilylation reaction, 50 to 90% by mass of [B] liquid component, and 1 to 10% by mass of [C] micro hollow spheres.

[0009]

[Chemical 2]

[In the formula, R is, independently of each other, a substituted or unsubstituted alkyl group having 1 to 18 carbon atoms and 7 to 7 carbon atoms.
21 represents an aralkyl group or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, and n is 0 to 500 on average.
Is the number of. ]

The following forms are preferred in the silicone gel composition of the present invention. (1) Trialkenyl isocyanurate (a-2)
As, use triallyl isocyanurate and / or trimethallyl isocyanurate. (2) 0.01 to 10% by mass of the liquid component is a surfactant. (3) Penetration is 200 or more. (4) Specific gravity is less than 0.7.

The mattress for bedding of the present invention is characterized by using the silicone gel composition of the present invention as a cushioning material.

[0013]

The silicone gel composition of the present invention having a gel skeleton of a specific polysiloxane crosslinked product maintains a good gel state despite the high proportion of liquid components (50 to 90% by mass). . As a result, the liquid component contained in a high proportion exhibits suitable softness as a cushioning material, and a favorable gel state is maintained, thereby exhibiting suitable cushioning properties. Moreover, as a result of maintaining a good gel state, leakage of the liquid component from the cushion material made of the gel composition is prevented. In this way, it is surprising that the contradictory requirements of "developing softness" and "preventing leakage of liquid components" can be satisfied at the same time. Further, the silicone gel composition of the present invention contains minute hollow spheres in a proportion of 1 to 10% by mass, so that the weight of the gel composition is reduced (specific gravity is 0.1.
7 or less), and further, the weight of the bedding or the like made of the gel composition can be reduced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. The silicone gel composition of the present invention is configured by impregnating a gel skeleton with a fluid (dispersion liquid) in which fine hollow spheres (dispersoids) are dispersed in a liquid component (dispersion medium).

<[A] Gel skeleton> The gel skeleton constituting the silicone gel composition of the present invention comprises a hydrosilicone (a-1) represented by the above general formula (1) and a trialkenyl isocyanurate (a-2). )) And a polysiloxane cross-linked product obtained by a hydrosilylation reaction with

In the above general formula (1) representing the hydrosilicone (a-1), the "alkyl group" represented by R is a methyl group, an ethyl group, a propyl group, a butyl group, an octyl group or a dodecyl group. Is preferred, and a methyl group is preferred. "Substituted alkyl group" represented by R
Examples thereof include halogenated alkyl groups such as trifluoropropyl group and chloropropyl group, and cyanoalkyl groups such as 2-cyanoethyl group. Examples of the "aralkyl group" represented by R include a benzyl group and a phenethyl group. Examples of the "aryl group" represented by R include a phenyl group, a toluyl group and a naphthyl group.

In the above general formula (1), n is an average number of 0 to 500, preferably 10 to 200 on average.
Is the number of. By limiting n to this range, the finally obtained silicone gel composition has suitable softness (hardness) as a cushioning material. n is 500
When it exceeds, the number of crosslinking points becomes too small, and it becomes difficult for the finally obtained composition to maintain a gel state.

Trialkenyl isocyanurate (a-
2) functions as a cross-linking agent for forming a gel skeleton (cross-linked polysiloxane). As such a trialkenyl isocyanurate (a-2), the following formula (D-
1) Triallyl isocyanurate (hereinafter,
It is called "TAIC". ), And the trimethallyl isocyanurate represented by the following formula (D-2) (hereinafter, referred to as “TMA
IC ”. ) Can be mentioned. TAIC and TMAIC can be used alone or in combination of two kinds, but TMAIC is normal temperature (25 ° C)
Therefore, TAIC is preferably used alone because it is solid and difficult to handle, and the hydrosilylation reaction rate is low. As TAIC and TMAIC, those commercially available from Nippon Kasei Co., Ltd. can be used.

[0019]

[Chemical 3]

A hydrosilicone (a-1) that is reacted to form a gel skeleton (crosslinked polysiloxane),
The proportion of the trialkenyl isocyanurate (a-2) to be used is usually that of the trialkenyl isocyanurate (a-2) relative to the number of hydrosilyl groups (SiH) groups of the hydrosilicone (a-1). Number of unsaturated bonds (total of allyl group and methallyl group) is 0.5 to 2.0
The ratio is doubled, preferably 0.8 to 1.5
The ratio is such that it is double, and more preferably 0.9 to 1.2.

The addition reaction of hydrosilicone (a-1) with trialkenyl isocyanurate (a-2) (hydrosilylation reaction to an unsaturated bond of trialkenyl isocyanurate) has temperature dependence of reaction rate. Since they are large, both can be mixed under a temperature condition of room temperature or lower, and this mixed system can be heated to accelerate the reaction. The heating temperature in this case is 50 to 150 ° C, preferably 60 to 120 ° C. A catalyst is preferably used for this hydrosilylation reaction. Compounds such as platinum, ruthenium, rhodium, palladium, osmium, and iridium are known as catalysts that can be used in the hydrosilylation reaction. A platinum compound is particularly useful, and examples of the platinum compound include chloroplatinic acid, simple substance of platinum, alumina, silica, carbon black or the like having solid platinum supported on it, platinum-vinylsiloxane complex, platinum. -A phosphine complex, a platinum-phosphite complex, a platinum alcoholate catalyst, etc. can be used. In the case of a platinum catalyst, about 0.0001 to 1 mass% of platinum can be added.

The content ratio of the gel skeleton in the silicone gel composition of the present invention is essentially 3 to 39% by mass, preferably 5 to 30% by mass. Since the gel skeleton is contained in the proportion of 3% by mass or more, the obtained silicone gel composition can maintain a good gel state even when the liquid component is contained in a high proportion.
When the content ratio of the gel skeleton is less than 3% by mass, it becomes difficult for the finally obtained composition to maintain the gel state, and the liquid component may be leaked or dispersed in the liquid component. There is a tendency to cause separation of small hollow spheres. On the other hand, when this ratio exceeds 39% by mass, the gel composition finally obtained cannot exhibit a sufficient buffering effect (cushioning property and suitable softness).

<(B) Liquid Component> As the liquid component constituting the silicone gel composition of the present invention, all liquids known to constitute silicone gel can be used. Specific examples include silicone oil, fluorine-based oil, trans oil, mineral oil, paraffin oil, polyphenyl ether and polyester, and these can be used alone or in admixture of two or more. . Of these, silicone oils, fluorine-based oils, paraffin oils, polyesters and the like are preferable, and silicone oils have excellent impact and pressure absorption characteristics, are physically and chemically stable, and are relatively flame retardant. Is particularly preferable.

Can be suitably used as a liquid component
As a specific example of silicone oil,
Roxane, fluorine-modified dimethylpolysiloxane and fluorine
Phenyl modified dimethyl polysiloxane can be mentioned.
It The polysiloxane skeleton has a linear or cyclic structure.
Examples thereof include those containing a branched chain. here,
As the modifying group of the fluorine-modified dimethylpolysiloxane,
Trifluoropropyl group (CF₃C₂H_Four-), And
Nonafluorohexyl group (C_FourF₉C ₂H_Four-)
can do.

The viscosity of the liquid component is not particularly limited.
There is not, but 1-100,000mm ²/ S (25 ℃)
Is more preferable, and more preferably 10 to 10,000
0 mm²/ S (25 ° C). Excessive viscosity of liquid component
In the manufacturing process of the gel composition,
Entrapment of bubbles makes it difficult for the bubbles to come out, which hinders handling.
May cause

The content ratio of the liquid component in the silicone gel composition of the present invention is essentially required to be 50 to 90% by mass, preferably 65 to 85% by mass. By containing the liquid component in a proportion of 50% by mass or more, softness suitable as a cushion material is exhibited. When the content ratio of the liquid component is less than 50% by mass, the gel composition finally obtained cannot exhibit a sufficient buffering effect (cushioning property and suitable softness). On the other hand, if this proportion exceeds 90% by mass, it may be difficult for the finally obtained composition to maintain the gel state.

It is also possible to add a surfactant as a part of the liquid component (B). Examples of usable surfactants include various conventionally known surfactants such as nonionic surfactants, anionic surfactants, cationic surfactants and zwitterionic surfactants. Specific examples of the nonionic surfactant include polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl ester, sorbitan fatty acid ester, silicone surfactant and sucrose fatty acid ester. Specific examples of the anionic surfactant include alkyl sulfates, alkylphenyl sulfonates, polyoxyethylene alkylphenyl sulfates and the like. Specific examples of the cationic surfactant include alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, benzyltrimethylammonium chloride and the like. Specific examples of the zwitterionic surfactant include alkyl betaine, alkyl amino acid and the like. These surfactants can be used alone or in combination of two or more kinds. Of these, nonionic surfactants that do not inhibit the hydrosilylation reaction are preferred. The content ratio of the surfactant in the liquid component is usually 0.01 to 10% by mass, preferably 0.05 to 5% by mass, more preferably 0.1 to 1% by mass.

When silicone oil is used as the main liquid component, it is preferable to use a polyoxyalkylene-polysiloxane copolymer together as a surfactant. Examples of the polyoxyalkylene-polysiloxane copolymer include a polyoxyalkylene-modified polysiloxane in which a polyoxyalkylene group is bonded to a side chain and / or a terminal of polysiloxane; and a polyoxyalkylene-polysiloxane alternating block copolymer. To be Examples of the polyoxyalkylene-modified polysiloxane include compounds represented by the following general formula (2).

[0029]

[Chemical 4]

[In the formula, R ^1's independently of each other are a substituted or unsubstituted alkyl group having 1 to 18 carbon atoms, and 7 carbon atoms.
~ 21 aralkyl group or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, R ² is represented by the formula:-(C
_{H 2) a -O (C 2} H 4 O) b - (C 3 H 4 O) c R 4
(In the formula, R ⁴ represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 5 carbon atoms, and a is 0 to
Represents an integer of 6, b represents an average number of 0 to 50, and c represents an average number of 0 to 50. However, b + c is 1 or more on average. ) Represents a polyoxyalkylene group, R ³ represents a group defined by R ¹ or R ² , and x
Represents a number of 0 to 500 on average, and y represents 0 to 500 on average.
Represents the number of. However, when y = 0, one or more of R ³ are R
^{Is 2} . ]

In the above general formula (2), R ¹ and R
^A methyl group is a preferred example of the group represented by ³ , and a methyl group is a preferred example of the group represented by R ⁴ .
Examples include an ethyl group, a propyl group and a butyl group. x
Is preferably 0 to 30, and more preferably 0 to
It is 5. The preferable range of y is 0 to 20, and more preferably 1 to 2. The value of a is preferably 3. The value of b is preferably 2 to 50, more preferably 5 to 20. The value of c is preferably 0 to 50, more preferably 0 to 25.

The polyoxyalkylene-polysiloxane copolymer can be obtained by a known production method, but those sold as SILWET (trade name) by Nippon Unicar Co., Ltd. are preferably used. Among SILWET, the preferred counts are L-77, L-7001, L-7.
002, FZ-2105, FZ-2108, FZ-21
10, FZ-2120, FZ-2123, FZ-213
0, FZ-2163, FZ-5609, L-720, F
Z-2122 and FZ-2203, especially L-7
7 is preferred.

<(C) Micro hollow sphere> The micro hollow sphere constituting the silicone gel composition of the present invention has a gas component inside an outer wall (shell wall) made of an organic resin, preferably a thermoplastic resin. Fine particles having an average particle size of several tens of μm (specifically, 30 to 80 μm) can be preferably used. From the viewpoint of reducing the weight of the gel composition, the true density of the hollow microspheres is preferably 100 kg / m ³ or less, more preferably 50 kg / m ³ or less. Materials for the outer wall of the micro hollow spheres include vinylidene chloride, acrylonitrile, methacrylonitrile,
Polymers of monomers selected from acrylic acid esters and methacrylic acid esters, and 2 of these monomers
Those selected from copolymers of more than one type are preferable.

Examples of commercially available micro hollow spheres include "Expansel (registered trademark)" (manufactured by Expansell) sold by Nippon Philite Co., Ltd. This "Expansel" has liquid isobutane inside a shell wall made of a thermoplastic resin, and when heated to 80 ° C or higher, the shell wall softens and is included. The isobutane present undergoes gasification and expansion, expanding the shell wall. For this shell wall, a copolymer of vinylidene chloride and acrylonitrile or a copolymer of acrylonitrile, methacrylonitrile and methyl methacrylate is used. In producing the silicone gel composition of the present invention, it is necessary to expand before the hydrosilylation reaction between the hydrosilicone (a-1) and the trialkenyl isocyanurate (a-2). Is several tens of μm (specifically 3
Products expanded to 0 to 80 μm) can be preferably used.
Other commercially available products of the hollow microspheres include "Matsumoto Microsphere" (Matsumoto Yushi-Seiyaku Co., Ltd.). Further, it is preferable to use the fine hollow spheres by coating the surface thereof with an alkoxysilane because the dispersibility in a liquid component is improved.

The content ratio of the hollow microspheres in the silicone gel composition of the present invention is essentially 1 to 10% by mass, preferably 2 to 6% by mass, more preferably 3 to 5% by mass. It 1-10% by mass of micro hollow spheres
By incorporating the above-mentioned component in a weight ratio, the weight of the resulting silicone gel composition can be reduced. Specifically, a silicone gel composition having a specific gravity of less than 0.7, and even less than 0.6 can be obtained. Then, by using such a lightweight gel composition as a cushioning material, it is possible to provide bedclothes and the like that are more practical than water beds and the like. When the content of the minute hollow spheres is less than 1% by mass, the weight of the gel composition cannot be reduced. On the other hand, if this ratio exceeds 10% by mass, an excessive amount of the micro hollow spheres cannot be uniformly dispersed in the liquid component, and some of the micro hollow spheres may be separated from the liquid component. . The viscosity of the dispersion liquid obtained by dispersing the micro hollow spheres in the liquid component tends to increase with an increase in the content ratio of the micro hollow spheres. By including as, it is possible to suppress and alleviate an increase in viscosity.

<Method for Producing Silicone Gel Composition> As a method for producing the silicone gel composition of the present invention, hydrosilicone, trialkenyl isocyanurate, liquid component, fine hollow spheres, metal, glass or the like is used. It is preferable to charge the mixture in a mold consisting of, and to carry out a hydrosilylation reaction in the presence of a liquid component and micro hollow spheres. According to this production method, the gel composition of the present invention is directly (in one step from the raw material) It can be obtained by operation) and the production efficiency can be improved. In addition, by reacting hydrosilicone and trialkenyl isocyanurate,
A gel skeleton made of a crosslinked polysiloxane may be obtained, and the liquid skeleton and the micro hollow spheres may be permeated into the gel skeleton.

Since the surface of the silicone gel composition of the present invention is sticky, it is preferable to use it by filling it in an outer bag. In this way, the silicone gel composition filled in the outer bag can be suitably used as a mattress for bedding. Here, the silicone gel composition of the present invention is lighter than the liquid (water) constituting the water bed,
Since liquid leakage is unlikely to occur, an outer bag made of thin and flexible material can be used as the outer bag. The material that constitutes the outer bag is cotton,
Examples thereof include cloth such as nylon, plastic sheets such as polyethylene and polypropylene, and rubber sheets. The silicone gel composition of the present invention can be produced in this outer bag. That is, hydrosilicone, trialkenyl isocyanurate,
The liquid component and the hollow microspheres may be charged in an outer bag and the hydrosilylation reaction may be carried out in the outer bag.

Since the silicone gel composition of the present invention has a gel skeleton composed of a specific polysiloxane crosslinked product, a good gel is obtained despite the high proportion of liquid components (50 to 90% by mass). The state is retained. As a result,
The liquid component contained at a high ratio develops softness (hardness) suitable as a cushioning material. In particular,
Penetration is 200 or more, preferably 230 to 350
Is. A gel composition having a penetration of 200 or more is suitable as a cushioning material that constitutes an article used for applications such as bedding, sofas, and seat cushions on which a human body rides or leans. The softness (hardness) of the silicone gel composition of the present invention can be changed by changing the value of n in the general formula (1) representing hydrosilicone or changing the relative proportion of the gel skeleton and the liquid component. It can be adjusted.

[0039]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited thereto. In addition,
The raw materials and the like used in the following examples and comparative examples are as follows.

Hydrosilicone (1): a compound represented by the following chemical formula (1). Hydrosilicone (2): a compound represented by the following chemical formula (2). Both ends vinyl silicone (1): a compound represented by the following chemical formula (3).

[0041]

[Chemical 5] (In the formula, n ′ is 90 on average.)

[0042]

[Chemical 6]

[0043]

[Chemical 7]

L-45 (10): viscosity 10 mm ² / s
(25 ° C.) dimethyl polysiloxane (manufactured by Nippon Unicar Co., Ltd.).・ L-45 (100): Viscosity 100 mm ² / s (25
℃) dimethyl polysiloxane (manufactured by Nippon Unicar Co., Ltd.). L-45 (1000): viscosity 1000 mm ² / s (2
5 ° C) dimethylpolysiloxane (manufactured by Nippon Unicar Co., Ltd.). SILWET L-77: polyoxyalkylene-polysiloxane copolymer (manufactured by Nippon Unicar Co., Ltd.). -EXPANCEL 551DE: micro hollow spheres (made by Expancel) having a shell wall made of a copolymer of vinylidene chloride and acrylonitrile, particle diameter 30 to 50 µm (particle diameter adjusted by heat expansion) ), True density 42 ± 4 kg / m ³ . EXPANCEL 092DE: Micro hollow spheres (made by Expancel) having a shell wall made of a copolymer of acrylonitrile, methacrylonitrile and methyl methacrylate, particle diameter 50 to 80 μm (particles by heat expansion) Adjusted diameter), true density 30 ± 3k
g / m ³ . -Catalyst P: divinyltetramethyldisiloxane solution of platinum divinyltetramethyldisiloxane complex (platinum concentration 1
2.0 mass%) diluted with L-45 (10) to a platinum concentration of 0.3%.

Example 1 According to the formulation shown in Table 1 below, 14.17 parts by mass of hydrosilicone (1) and TA
IC 0.38 parts by mass and "L-45 (100)" 82.
45 parts by mass and 3 parts by mass of "EXPANCEL 551DE" were placed in a beaker, and each compound was uniformly mixed using a propeller mixer, followed by degassing under reduced pressure. Next, 1.00 parts by mass of the catalyst P was added, and the mixture was uniformly mixed with a propeller mixer, degassed under reduced pressure, and then heated at 90 ° C for 30 minutes to obtain a gel composition of the present invention.

Example 2 According to the formulation shown in Table 1 below, 14.02 parts by mass of hydrosilicone (1) and TA
IC 0.38 parts by mass and "L-45 (100)" 81.
A gel composition of the present invention was obtained in the same manner as in Example 1 except that 60 parts by mass and 4 parts by mass of "EXPANCEL 551DE" were charged in a beaker.

Example 3 According to the formulation shown in Table 1 below, 14.17 parts by mass of hydrosilicone (1) and TA
IC 0.38 parts by mass and "L-45 (1000)" 8
2.45 parts by mass and "EXPANCEL 551DE"
A gel composition of the present invention was obtained in the same manner as in Example 1 except that 3 parts by mass was charged in a beaker.

Example 4 According to the formulation shown in Table 1 below, 14.02 parts by mass of hydrosilicone (1) and TA
IC 0.38 parts by mass and "L-45 (1000)" 8
1.60 parts by mass and "EXPANCEL 551DE"
A gel composition of the present invention was obtained in the same manner as in Example 1 except that 4 parts by mass was charged in a beaker.

Example 5 According to the formulation shown in Table 1 below, 14.17 parts by mass of hydrosilicone (1) and TA
IC 0.38 parts by mass and "L-45 (1000)" 8
2.45 parts by mass and "EXPANCEL 092DE"
A gel composition of the present invention was obtained in the same manner as in Example 1 except that 3 parts by mass was charged in a beaker.

Example 6 According to the formulation shown in Table 1 below, 18.50 parts by mass of hydrosilicone (1) and TA
IC 0.50 parts by mass and "L-45 (100)" 75.
A gel composition of the present invention was obtained in the same manner as in Example 1 except that 50 parts by mass, 5 parts by mass of "EXPANCEL 551DE" and 0.50 parts by mass of "SILWET L-77" were charged into a beaker. .

Example 7 According to the formulation shown in Table 1 below, 15.99 parts by mass of hydrosilicone (1) and TM
0.50 parts by mass of AIC and "L-45 (100)" 8
0.51 parts by mass and "EXPANCEL 551DE"
3 parts by mass were placed in a beaker, and each compound was uniformly mixed using a propeller mixer, followed by degassing under reduced pressure.
Next, 1.00 part by mass of the catalyst P was added, and the mixture was further uniformly mixed with a propeller mixer and defoamed under reduced pressure, and then at 6 ° C at 6 ° C.
The gel composition of the present invention was obtained by heating for 0 minutes.

Comparative Example 1 According to the formulation shown in Table 1 below, 4.90 parts by mass of hydrosilicone (2), 43.60 parts by mass of vinyl silicone (1) at both ends, and "L-4"
5 (100) "48.50 parts by mass and" EXPANCE
L 551DE ”(3 parts by mass) was placed in a beaker, each compound was uniformly mixed using a propeller mixer, and then degassing under reduced pressure was performed. Next, 1.00 parts by mass of the catalyst P was added, and the mixture was further uniformly mixed with a propeller mixer, defoamed under reduced pressure, and then heated at 90 ° C. for 30 minutes to obtain a gel composition.

Comparative Example 2 According to the formulation shown in Table 1 below, 6.84 parts by mass of hydrosilicone (2), 61.04 parts by mass of vinyl silicone (1) at both ends, and "L-4"
5 (100) "29.10 parts by mass and" EXPANCE
A gel composition for comparison was obtained in the same manner as in Comparative Example 1 except that 3 parts by mass of "L551DE" was charged in a beaker.

Comparative Example 3 According to the formulation shown in Table 1 below, 5.05 parts by mass of hydrosilicone (2), 44.95 parts by mass of vinyl silicone having both ends (1) and "L-4" were used.
A gel composition for comparison was obtained in the same manner as in Comparative Example 1 except that 5 (100) ”and 50.00 parts by mass were charged in a beaker.

Comparative Example 4 According to the formulation shown in Table 1 below, 1.47 parts by mass of hydrosilicone (2), 13.08 parts by mass of vinyl silicone (1) at both ends, and "L-4"
5 (100) ”82.45 parts by mass and“ EXPANCE
L 551DE ”(3 parts by mass) was placed in a beaker, and the compound was uniformly mixed using a propeller mixer, followed by degassing under reduced pressure. Next, 1.00 parts by mass of the catalyst P is added,
Further, after uniformly mixing with a propeller mixer and defoaming under reduced pressure, the mixture was heated and heated at 90 ° C. for 30 minutes, but no gel was formed.

(Evaluation of Gel Composition) For each of the gel compositions obtained in Examples 1 to 7 and Comparative Examples 1 to 3,
The penetrability was measured according to the penetrability test method specified in JIS K2207-1996 "Petroleum asphalt" to evaluate the softness (hardness) of the gel composition. Further, the specific gravity of each gel composition was measured according to the solid specific gravity measuring method defined in JIS Z8807-1976. The results are also shown in Table 1 below.

[0057]

[Table 1]

As is clear from the results shown in Table 1,
The gel compositions of the present invention obtained in Examples 1 to 7 have a penetration of 200 or more and a softness suitable as a cushioning material for bedding and the like. Further, the specific gravity is 0.6 or less, which is extremely lightweight. On the other hand, the gel compositions according to Comparative Examples 1 to 3 have low penetration and do not have softness suitable as a cushioning material for bedding and the like. Moreover, the gel composition according to Comparative Example 3 has a large specific gravity and is not lightened.

[0059]

EFFECTS OF THE INVENTION The gel composition of the present invention can maintain a good gel state even when the proportion of liquid components is high, and is suitable as a cushioning material for bedding, sofas, seat cushions and the like, and has softness and cushioning property. It has a liquid leakage, is less likely to leak, and is lightweight. The mattress of the present invention has suitable softness and cushioning properties, is resistant to liquid leakage, and is lightweight.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3B096 AD08                 4J002 AE051 BD103 BD121 BG043                       BG053 BG103 CF001 CH071                       CP031 CP192 FA103 GC00                 4J035 JA03 JB01 LA02 LB20

Claims (6)

[Claims] 1. [A] 3-39 mass% of a gel skeleton obtained by a hydrosilylation reaction of a hydrosilicone (a-1) represented by the following general formula (1) with a trialkenyl isocyanurate (a-2). A silicone gel composition for a cushion material, comprising [B] a liquid component of 50 to 90 mass% and [C] a micro hollow sphere of 1 to 10 mass%. [Chemical 1] [In formula, R is a substituted or unsubstituted C1-C18 alkyl group, a C7-C21 aralkyl group, or a substituted or unsubstituted C6-C20 aryl group. , N is an average number of 0 to 500. ] 2. A triallyl isocyanurate and / or as the trialkenyl isocyanurate (a-2).
Alternatively, trimethallyl isocyanurate is used.
The silicone gel composition described. 3. [B] 0.01 to 10% by mass of liquid component
Is a surfactant, The silicone gel composition according to claim 1 or 2. 4. The silicone gel composition according to claim 1, having a penetration of 200 or more. 5. The silicone gel composition according to claim 1, which has a specific gravity of less than 0.7. 6. A mattress for bedding comprising the silicone gel composition according to any one of claims 1 to 5 as a cushioning material.