JP5539670B2 - Modified silicone resin foam and bedding comprising the modified silicone resin foam - Google Patents

Description

  The present invention relates to a modified silicone resin foam using a modified silicone polymer as a base resin, and a bedding such as a pillow and a mattress using the same.

  Generally, soft foam is often used for bedding such as pillows and mattresses, cushions, core materials such as cushions, and pads for clothing. Among them, in particular, those using a polyurethane foam having low resilience are attracting attention in recent years. However, the light resistance of polyurethane foam may be a problem. For example, in a standard use environment when used as a bedding, that is, in a bedroom-like environment where sunlight enters, it becomes yellowed or embrittled. There is a case.

  In order to solve this problem, Patent Document 1 discloses a flexible polyurethane foam having improved light resistance by adding a specific light stabilizer. As the evaluation of light resistance, only the tensile strength is evaluated. In addition, polyurethane has a problem of using an isocyanate which is toxic.

  On the other hand, Patent Document 2 discloses a foam that uses a silicon-based polymer as a base resin and does not use an isocyanate that is a concern about toxicity. Although it is described that a light stabilizer and an antioxidant can be added, specific combinations and specific effects when these are added are not described.

JP 11-246755 A JP 2008-266867 A

  While intensively examining a foam made of a silicone-based polymer described in Patent Document 2, this foam has the advantage that yellowing or embrittlement due to light is not observed as compared with urethane. In particular, it has been found that there is a problem that the surface tackiness increases.

  An object of the present invention is to provide a modified silicone resin foam in which an increase in surface tack over time is suppressed.

  As a result of intensive studies to solve the above problems, the present inventors have found that, depending on the type of the light-resistant stabilizer, there is a case where no cured foaming occurs and the modified silicone-based resin foam itself may not be obtained. It was. As a result of further investigation, as a light-resistant stabilizer, those containing sulfur and phosphorus as constituent elements, and those containing no primary or secondary amine, and hindered phenol antioxidants and hindered amine light The modified silicone resin foam containing the stabilizer does not change the surface appearance even after the day, and can suppress the increase in surface tack over time, so there is no problem when used as a pillow or mattress. The headline, the present invention has been completed.

That is, the present invention has the following configuration.
[1] A modified silicone resin foam containing a hindered phenol-based antioxidant and a hindered amine-based light stabilizer containing no sulfur atom, phosphorus atom, primary amine, or secondary amine as a light resistance stabilizer.
[2] A curing agent (A) having at least two hydrosilyl groups in the molecular chain, at least one alkenyl group in the molecular chain, and a repeating unit constituting the main chain consisting of oxyalkylene units. The modified silicone resin foam according to [1], which is obtained by curing a foamable liquid resin composition comprising a coalescence (B), a hydrosilylation catalyst (C), a foaming agent (D), and a light resistance stabilizer (E) body.
[3] The modified silicone resin foam according to [1] or [2], further comprising an ultraviolet absorber.
[4] The modified silicone resin foam according to any one of [1] to [3], wherein the ultraviolet absorber is a benzotriazole-based ultraviolet absorber.
[5] The modified silicone resin foam according to any one of [1] to [4], wherein the hindered amino group of the hindered amine light stabilizer is> NR type.
[6] The content of the hindered phenol antioxidant and the hindered amine light stabilizer not containing the sulfur atom, phosphorus atom, primary amine, or secondary amine is 100 parts by weight of the polymer (B). The modified silicone resin foam according to any one of [2] to [5], which is 0.01 part by weight or more and 5 parts by weight or less.
[7] The modified silicone resin foam according to any one of [1] to [6], wherein the density is 20 kg / m ³ or more and 700 kg / m ³ or less.
[8] A bedding using the modified silicone resin foam according to any one of [1] to [7].
[9] The bedding according to [8], wherein the bedding is a pillow or a mattress.

  The modified silicone resin foam of the present invention has no change in surface appearance even after the passage of time, and can suppress surface adhesiveness over time. Therefore, it is possible to provide a bedding with little deterioration in a standard use environment when used as a bedding such as pillows and mattresses.

  The modified silicone resin foam of the present invention contains a hindered phenol antioxidant and a hindered amine light stabilizer that does not contain a sulfur atom, a phosphorus atom, a primary amine, or a secondary amine as a light resistance stabilizer. . The light-resistant stabilizer in the present invention is a function that absorbs light having a wavelength in the ultraviolet region and suppresses the generation of radicals, or a function that captures radicals generated by light absorption and converts them into thermal energy to render them harmless. And a compound that enhances stability to light. Note that the ultraviolet absorber is a compound having a function of absorbing light having a wavelength in the ultraviolet region and suppressing the generation of radicals.

  It is known that both hindered phenolic antioxidants and hindered amine light stabilizers function as the above-mentioned radical scavenger. In the present invention, by using a hindered phenol antioxidant together with a hindered amine light stabilizer containing no sulfur atom, phosphorus atom, primary amine, or secondary amine, cured foaming occurs and is obtained. It was found that the modified corn resin foam had no change in the surface appearance even after the passage of time and could suppress the increase in surface tack over time.

  Furthermore, in this invention, it became possible to suppress the raise of surface adhesiveness with time more efficiently by using together an ultraviolet absorber.

  Although it does not specifically limit as a hindered phenolic antioxidant of this invention, The compound shown below can be illustrated.

Triethylene glycol-bis- [3- (3-t-butyl-5-methyl-4hydroxyphenyl) propionate] (trade name: IRGANOX (registered trademark) 245 (manufactured by Ciba Japan)), pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate (trade name: IRGANOX (registered trademark) 1010 (manufactured by Ciba Japan Co., Ltd.)), thiodiethylenebis [3- (3 5-Di-tert-butyl-4-hydroxyphenyl) propionate] (trade name: IRGANOX (registered trademark) 1035 (manufactured by Ciba Japan), benzenepropanoic acid, 3,5-bis (1,1-dimethyl) ethyl) -4-hydroxy, C ₇ -C ₉ side chain alkyl ester (trade name: IRGANOX (R) 135 (manufactured by Ciba Japan)), 4,6-bis (dodecylthiomethyl) -o-cresol (trade name: IRGANOX (registered trademark) 1726 (manufactured by Ciba Japan)), N-phenylbenzene Reaction product of amine and 2,4,4-trimethylpentene (trade name: IRGANOX (registered trademark) 5057 (manufactured by Ciba Japan)), 2-t-butyl-6- (3-t-butyl 2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate (trade name: Sumilizer (registered trademark) GM (manufactured by Sumitomo Chemical Co., Ltd.)), 3,9-bis [2- [3- (t- (Butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl] 2,4,8,10-tetraoxaspiro [5 · 5] undecane (trade name: S umilizer (registered trademark) GA-80 (manufactured by Sumitomo Chemical Co., Ltd.)), 2,6-di-tert-butyl-4-methylphenol (trade name: NOCRACK 200 (manufactured by Ouchi Shinsei Chemical Co., Ltd.)) 2,2′-methylenebis (4-methyl-6-tert-butylphenol) (trade name: NOCRACK NS-6 (manufactured by Ouchi Shinsei Chemical Co., Ltd.)), 2,5-di-tert-amylhydroquinone ( Product name: NOCRACK DAH (manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.).

  Among them, a compound containing no sulfur atom, phosphorus atom, primary amine, or secondary amine in the molecule is preferable. Specifically, triethylene glycol-bis- [3- (3-t-butyl- 5-methyl-4hydroxyphenyl) propionate] (trade name: IRGANOX (registered trademark) 245 (manufactured by Ciba Japan)), pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4- Hydroxyphenyl) propionate (trade name: IRGANOX (registered trademark) 1010 (manufactured by Ciba Japan)), benzenepropanoic acid, 3,5-bis (1,1-dimethylethyl) -4-hydroxy, C7-C9 Side chain alkyl ester (trade name: IRGANOX (registered trademark) 1135 (manufactured by Ciba Japan)), 2-t-butyl-6 (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate (trade name: Sumilizer (registered trademark) GM (manufactured by Sumitomo Chemical Co., Ltd.)), 3,9-bis [2- [3- (t-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl] 2,4,8,10-tetraoxaspiro [5.5] undecane (trade name: Sumilizer (Registered trademark) GA-80 (manufactured by Sumitomo Chemical Co., Ltd.)), 2,6-di-tert-butyl-4-methylphenol (trade name: NOCRACK 200 (manufactured by Ouchi Shinsei Chemical Co., Ltd.)), 2,2′-methylenebis (4-methyl-6-tert-butylphenol) (trade name: NOCRACK NS-6 (manufactured by Ouchi Shinsei Chemical Co., Ltd.)), 2,5-di-tert-a Le hydroquinone (trade name: NOCRAC DAH (Ouchi manufactured by Shinko Chemical Industry Co., Ltd.), and the like.

  Specific examples of the hindered amine light stabilizer containing no sulfur atom, phosphorus atom, primary amine, or secondary amine of the present invention include bis (1,2,2,6,6-pentamethyl-4-piperidyl). ) Sebacate (trade name: Sanol LS765 (manufactured by Ciba Japan Co., Ltd.)), bis (1,2,2,6,6-pentamethyl-4-piperidyl) {[3,5-bis (1,1- Dimethylethyl) -4-hydroxyphenyl] methyl} butylmalonate Trade name: TINUVIN (registered trademark) 144 (manufactured by Ciba Japan Co., Ltd.)), dimethyl succinate and 4-hydroxy-2,2,6,6- Polymer of tetramethyl-1-piperidineethanol (trade name: TINUVIN (registered trademark) 622LD (manufactured by Ciba Japan)), N-acetyl-3-dodecyl- -(2,2,6,6-tetramethyl-4-piperidinyl) pyrrolidine-2,5-dione (trade name: Hostavin (registered trademark) 3058 (manufactured by Clariant Japan Co., Ltd.)), Provandioic acid [{ 4-methoxyphenyl} methylene] -bis (1,2,2,6,6-pentamethyl-4-piperidyl) ester (trade name: Hostavin (registered trademark) PR-31 (manufactured by Clariant Japan Co., Ltd.)), etc. Can be given. Commercially available hindered amine light stabilizers include Sanol LS765, TINUVIN (registered trademark) 144, TINUVIN (registered trademark) 622LD (manufactured by Ciba Japan Co., Ltd.), Hostavin (registered trademark) 3058, and Hostavin (registered trademark). For example, PR-31 (manufactured by Clariant Japan Co., Ltd.) can be exemplified.

  Furthermore, it is preferable that the hindered amino group of the hindered amine light stabilizer is> NR type because it does not cause reaction inhibition or curing inhibition and is excellent in the effect of suppressing increase in surface tack over time. Specific examples of the compound having such a structure include SANOL LS765, TINUVIN (registered trademark) 144, TINUVIN (registered trademark) 622LD (manufactured by Ciba Japan Co., Ltd.), and Hostavin (registered trademark) PR-31. (Clariant Japan Co., Ltd.) etc. can be illustrated.

  In the present invention, an ultraviolet absorber can be used in combination with a hindered phenol antioxidant and a hindered amine light stabilizer not containing a sulfur atom, phosphorus atom, primary amine, or secondary amine. It is preferable to use a UV absorber in combination because it is possible to further suppress an increase in surface tack over time. The ultraviolet absorber used is not particularly limited, and examples thereof include benzoxazine-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, and triazine-based ultraviolet absorbers.

  In particular, a benzotriazole-based ultraviolet absorber is preferable in that it has a high effect of suppressing an increase in surface tack over time. Specific examples of the benzotriazole ultraviolet absorber include 2- (5-methyl-2-hydroxyphenyl) benzotriazole (trade name: TINUVIN (registered trademark) P (manufactured by Ciba Japan)), 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole (trade name: TINUVIN (registered trademark) 234 (manufactured by Ciba Japan)), 2- (3 -T-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole (trade name: TINUVIN (registered trademark) 326 (manufactured by Ciba Japan)), 2- (2'-hydroxy-5) '-T-octylphenyl) benzotriazole (trade name: TINUVIN (registered trademark) 329 (manufactured by Ciba Japan)), methyl-3- [ 3-t-butyl-5- (2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate-polyethylene glycol (molecular weight about 300) condensate (trade name: TINUVIN® 213 (Ciba Japan)), 2,2′-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol] (trade name: ADK STAB LA-31 (manufactured by ADEKA Corporation)) and the like.

  Commercially available benzotriazole-based UV absorbers include TINUVIN (registered trademark) P, TINUVIN (registered trademark) 234, TINUVIN (registered trademark) 326, TINUVIN (registered trademark) 329, TINUVIN (registered trademark) 213 (and above, Ciba Japan Co., Ltd.), ADK STAB LA-31 (manufactured by ADEKA Corporation), and the like.

  The content of the hindered phenol-based antioxidant which is the light-resistant stabilizer (E) and the hindered amine-based light stabilizer not containing the sulfur atom, phosphorus atom, primary amine, or secondary amine is described below. (B) It is preferably 0.01 parts by weight or more and 5 parts by weight or less, more preferably 0.1 parts by weight or more and 3 parts by weight or less, particularly 0.3 parts by weight or more and 1 part by weight with respect to 100 parts by weight. .5 parts by weight or less is preferable.

  When each compounding quantity of a light-resistant stabilizer (E) component is less than this range, the effect which suppresses the raise of surface tack with time may not be acquired. On the other hand, if the blending amount of the light resistance stabilizer (E) component exceeds this range, the curability of the modified silicone resin foam is lowered, and it may be difficult to obtain a good modified silicone resin foam.

  Although the modified silicone resin foam of the present invention has a siloxane unit as a part of the main chain or as a side chain or a cross-linked chain, the majority is composed of an organic polymer.

  Among them, it is particularly preferable to use a resin obtained by curing a mixture containing a hydrosilyl group compound, an alkenyl group compound, or a hydrosilylation catalyst, which is called an addition-type modified silicone resin. It is preferable because of excellent balance and excellent balance of physical properties as bedding such as pillows and mattresses.

  In particular, a curing agent (A) having at least two hydrosilyl groups in the molecular chain, a polymer having at least one alkenyl group in the molecular chain, and the repeating unit constituting the main chain being an oxyalkylene unit A flexible modified silicone resin foam obtained by curing a foamable liquid resin composition comprising (B), a hydrosilylation catalyst (C), a foaming agent (D), and a light-resistant stabilizer (E) Is preferable.

  The compound having a hydrosilyl group is preferably a curing agent (A) having at least two hydrosilyl groups in the molecular chain (hereinafter sometimes simply referred to as a curing agent (A)). That is, the curing agent (A) acts as a curing agent for the compound having an alkenyl group, which will be described later.

  The curing agent (A) has at least 2, preferably 2 to 100, more preferably 2 to 70, and still more preferably 3 to 50 hydrosilyl groups in the molecular chain. The group reacts with the alkenyl group present in the molecular chain of the compound having an alkenyl group, which will be described later, and cures. When the number of the hydrosilyl groups is less than 2, the curing rate when the composition of the present invention is cured by a hydrosilylation reaction is slowed down, which may cause poor curing. Further, when the number of hydrosilyl groups is more than 100, the stability of the curing agent (A) and the stability of the modified silicone resin foam of the present invention are deteriorated, and a large amount of hydrosilyl groups are present after curing. It tends to remain in the modified silicone resin and may cause cracks.

In the present invention, having one hydrosilyl group means having one SiH bond. For example, in the case of SiH ₂ , it has two hydrosilyl groups. However, if the number of H bonded to one Si is one, the curability is improved and it is preferable from the viewpoint of flexibility. Although there is no restriction | limiting in particular about the structure of the said hardening | curing agent (A), For example, the hardening | curing agent of patent document 2 is mention | raise | lifted.

  As the compound having an alkenyl group in the present invention, a polymer (B) having at least one alkenyl group in a molecular chain and a repeating unit constituting the main chain being an oxyalkylene unit (hereinafter simply referred to as a polymer). (B) may be suitably used. The polymer (B) is a component that is cured by a hydrosilylation reaction with the curing agent (A). Since the polymer (B) has at least one alkenyl group in the molecular chain, the hydrosilylation reaction takes place and the polymer is cured. To do. The number of alkenyl groups contained in the polymer (B) is at least one from the viewpoint of hydrosilylation reaction with the curing agent (A). From the viewpoint of curability and flexibility, both ends of the molecular chain are required. Preferably an alkenyl group is present. Although there is no restriction | limiting in particular about the structure of the said polymer (B), For example, the oxyalkylene type polymer of patent document 2 is mention | raise | lifted.

  The hydrosilylation catalyst (C) of the present invention is not particularly limited as long as it can be used as a hydrosilylation catalyst, and any amount can be used in any amount. The hydrosilylation catalyst and the amount used thereof are preferably used.

  In the present invention, a modified silicone resin is used as a base resin, and the base resin is foamed by including a foaming agent (D) and foaming.

  Although it does not specifically limit as a foaming agent (D) of this invention, For example, physical foaming agents, such as a volatile liquid and gas, which are normally used for organic foams, such as a polyurethane, phenol, a polystyrene, and polyolefin, Examples thereof include a chemical foaming agent that generates gas by thermal decomposition or a chemical reaction, an active hydrogen group-containing compound that generates hydrogen by reacting with a hydrosilyl group, and these may be used in combination. Specific examples include various foaming agents described in Patent Document 2. Among these, the active hydrogen group-containing compound is preferably used because it contributes to improvement in open cell ratio and expression of physical properties such as flexibility.

  As the active hydrogen group-containing compound, primary saturated hydrocarbon alcohol, carboxylic acid or water is preferably used.

  Among these active hydrogen group-containing compounds, it is preferable to contain at least one selected from the group consisting of water, alcohol, and polyether polyol from the viewpoint of reactivity and handleability. From the viewpoint of imparting wettability, a compound in which oxygen is directly bonded to carbon or water is preferable, that is, water, ethanol, and polyethylene glycols are preferable.

  In addition, a foam regulator, a filler, a storage stabilizer, a thickener and the like may be added to the base resin as necessary to the extent that the effects of the present invention are not lost.

  Furthermore, if necessary, foaming aids, fillers, radical inhibitors, adhesion improvers, flame retardants, polydimethylsiloxane-polyalkylene oxide surfactants or organic surfactants (polyethylene glycol alkyl phenyl ether, etc.) Foam stabilizers, acids or basic compounds (additives for adjusting the reaction between hydrosilyl groups and hydroxyl groups, suppressing condensation reactions with acids and accelerating with bases), storage stability improvers, ozone Deterioration preventive agent, thickener, plasticizer, coupling agent, conductivity imparting agent, antistatic agent, radiation blocking agent, nucleating agent, phosphorus peroxide decomposing agent, lubricant, pigment, metal deactivator, physical properties A regulator or the like can be added within a range that does not impair the object and effect of the present invention. Moreover, a foaming auxiliary agent can also be added in order to assist the improvement of the expansion ratio of the modified silicone resin foam.

  In addition, a surfactant can be added for the purpose of improving the foam stability and the compatibility of the curing agent (A), the polymer (B), the hydrosilylation catalyst (C), and the foaming agent (D).

  Furthermore, if necessary, a storage stability improver is added to the liquid resin composition comprising the curing agent (A), the polymer (B), and the hydrosilylation catalyst (C) in order to improve the storage stability. May be. As the storage stability improver, any conventional stabilizer known as a storage stabilizer for the curing agent (A) can be used as long as it achieves the intended purpose. Preferred examples of such storage stability improvers include, for example, compounds containing aliphatic unsaturated bonds, organophosphorus compounds, organosulfur compounds, nitrogen-containing compounds, tin compounds, and organic peroxides. And at least one selected from these groups can be used. Specific examples include benzothiazole, thiazole, dimethyl malate, dimethyl acetylenedicarboxylate, 2-pentenenitrile, 2,3-dichloropropene, quinoline, and the like, and at least one selected from these groups is used. However, it is not limited to these. Among these, thiazole, benzothiazole, and dimethyl malate are particularly preferable in terms of both pot life and fast curability.

  Furthermore, if necessary, a foam regulator may be added to the modified silicone resin foam of the present invention. There are no particular limitations on the type of the air conditioner, and commonly used inorganic inorganic powders such as talc, calcium carbonate, magnesium oxide, titanium oxide, zinc oxide, carbon black, silica, polyether modified silicone oil, etc. These silicone oil compounds and fluorine compounds can be used, and at least one selected from the group can be used.

As the density of the obtained modified silicone resin foam, a material having a low density is suitably used for handling as a bedding. However, when the density is extremely low, bottoming out occurs. From this viewpoint, it is preferably 20 kg / m ³ or more and 700 kg / m ³ or less, more preferably 30 kg / m ³ or more and 700 kg / m ³ or less, and particularly preferably 50 kg / m ³ or more and 500 kg / m ³ or less.

  Heat curing may be performed for the purpose of reducing the compression set of the modified silicone resin foam. The heat curing conditions are not particularly limited, but in the modified silicone resin foam in the present invention, the heating is preferably performed at 20 ° C. or higher and 200 ° C. or lower, preferably 10 minutes or longer and 72 hours or shorter. Curing is preferable because compression set is reduced. Generally, the hardness of the obtained modified silicone resin foam may be increased by heat curing, but the modified silicone resin foam of the present invention tends to suppress an increase in hardness. Specifically, the hardness measured with a tofu hardness meter (model number: SOWB-110G, manufactured by Shiro Sangyo Co., Ltd.) after heat curing at 60 ° C. for 24 hours is preferably not more than 5 times the hardness before heat curing. Yes, more preferably 4 times or less.

  The modified silicone resin foam of the present invention as described above is a standard when used as bedding because there is no change in the surface appearance even after the day, and the increase in surface tack over time can be suppressed. It can be suitably used as a bedding with little deterioration in the usage environment. Bedding includes pillows such as so-called pillows that support the head, pillows, waist pillows, leg pillows, neck pillows, eye pillows, hip pillows, triangle pillows, mattresses such as mattresses and mattresses, comforters, mattresses, etc. Futons and so on. Among these, use as pillows and mattresses is preferable because of the effect of imparting comfort during sleep.

  When used as bedding for pillows, mattresses, etc., it can be used as it is or as a pillow, mattress, or other bedding after the skin layer formed during foam molding has been excised or cut into an appropriate shape. it can. The modified silicone resin foam obtained above may be used alone, but as long as the change in hardness due to temperature, which is a characteristic of the modified silicone resin foam, is utilized, it is an unfoamed plastic, foam. Modified silicone resin foam, film, cloth, non-woven fabric, paper, etc. with different magnifications may be used as a single piece, and the surface of the modified silicone resin foam is made of cotton, acrylic fiber, hair, polyester fiber, etc. A woven fabric or a non-woven fabric may be used in combination by pasting or stitching. By combining in this way, the tactile sensation of the modified silicone resin foam can be further improved, and the bedding can also be subjected to a sweat absorbing action by the combined fabric when sweating at high temperature and high humidity.

  The shape of the modified silicone resin foam of the present invention and the bedding such as pillows and mattresses is not particularly limited, but is a polygon such as a rectangle, a square, a circle, an ellipse, a rhombus, or a strip shape. Or a donut-shaped interior, or a surface with arbitrary irregularities. However, when it is necessary to effectively develop the air permeability, it is preferable to excise the skin layer, to provide an opening in the skin layer, or to make a through hole.

  EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Measurement and evaluation in Examples and Comparative Examples were performed under the following conditions and methods. In addition, unless there is particular notice, the part and% of an Example and a comparative example are a basis of weight.

<Moldability>
As for moldability, the curability and shrinkage during heat curing at the time of molding were evaluated by ○ and ×.
○: The foam can be removed from the mold and does not shrink.
X: The foam cannot be removed from the mold. Alternatively, the foam can be removed from the mold, but shrinks.

<Light resistance evaluation>
The change in the surface appearance and the surface tackiness of the sample after irradiation for 100 hours with a 63 ° C. fade meter were evaluated in the following three stages: ○, Δ, and ×.
(1) Change in surface appearance ○: No change in appearance Δ: Slight change observed ×: Appearance changed (2) Surface tackiness ○: No tackiness on the surface Δ: Partially tacky ×: Sticky overall

<Molded body density>
The density was calculated by cutting out about 30 mm square from the obtained modified silicone resin foam, measuring the size of three sides, calculating the volume (m ³ ), and dividing it from the measured weight (kg).

<Compound used>
In the examples and comparative examples, the compounds shown in Table 1 were used.

(Examples 1-6, Comparative Examples 1-6)
Stabilizer is added to 100 parts of polymer B in the amount shown in Table 2, 20.0 parts of foaming aid is added and stirred, 12.3 parts of foaming agent D and 0% of retarder are added. Add 0135 parts of catalyst C and 0.2135 parts of catalyst C and mix thoroughly. Further, 16.1 parts of curing agent A was added and mixed quickly. This mixture was poured into a disposable cup and cured by heating in an oven at 50 ° C. for 1 hour and further in an oven at 60 ° C. for 2 hours to obtain a modified silicone resin foam. Table 2 shows the evaluation results of the moldability, density and light resistance of the obtained modified silicone resin foam.

  As shown in the examples, as a light-resistant stabilizer, by including a hindered phenol antioxidant and a hindered amine light stabilizer not containing a sulfur atom, a phosphorus atom, a primary amine, or a secondary amine, As compared with Comparative Example 1 and Comparative Example 2 that do not contain the stabilizer, the surface appearance is not changed, and the increase in surface tack over time is improved.

  Even if it is a hindered amine light stabilizer, if it contains a sulfur atom, phosphorus atom, primary amine, or secondary amine, as in Comparative Example 3, rather than suppressing the increase in surface tack over time, a modified silicone resin foam It turns out that the body cannot be made.

  Further, when a stabilizer containing a phosphorus atom or a sulfur atom in a molecule such as a phosphorus-based processing heat stabilizer or a sulfur heat-resistant stabilizer, which is generally used as a stabilizer, is used in Comparative Example 5 and Comparative Example 6. Does not cause cured foaming.

  As in Example 1 and Example 3, it can be seen that the effect of suppressing the increase in surface adhesiveness can be further improved by using an ultraviolet absorber in combination. In addition, as in Example 2, a benzotriazole-based ultraviolet absorber. If is used, the effect of suppressing the increase in surface adhesiveness is better.

  From the above results, the modified silicone resin foam of the present invention contains a hindered phenol antioxidant and a hindered amine light stabilizer not containing a sulfur atom, a phosphorus atom, a primary amine, or a secondary amine. Thus, it becomes a modified silicone resin foam having good moldability, no change in the surface appearance even after the day, and having a light resistance that suppresses an increase in surface tack over time.

(Examples 7 to 12)
Pillows and mattresses were produced using the materials of Examples 1-6. As a result of using these pillows and mattresses as bedding, the standard usage environment when using them as bedding, that is, when they are used in a room with sunlight, etc. It was a good bedding in that the physical properties did not change and good sleeping comfort was obtained.

Claims (8)

A polymer (B) having at least one alkenyl group in the molecular chain, wherein the repeating unit constituting the main chain is an oxyalkylene unit, and a hindered phenol antioxidant as a light-resistant stabilizer, And a modified silicone resin foam containing a hindered amine light stabilizer not containing a sulfur atom, a phosphorus atom, a primary amine, or a secondary amine,
The content of the hindered phenol-based antioxidant and the hindered amine-based light stabilizer containing no sulfur atom, phosphorus atom, primary amine, or secondary amine is 0 with respect to 100 parts by weight of the polymer (B). A modified silicone resin foam having a content of 0.01 parts by weight or more and 5 parts by weight or less. Further, the curing agent having at least two hydrosilyl groups in the molecular chain (A), arsenide Doroshiriru catalyst (C), foaming agent (D), and light fastness stabilizer comprising (E) foaming liquid resin The modified silicone resin foam according to claim 1, wherein the composition is cured. Furthermore, the modified silicone resin foam of Claim 1 or 2 containing a ultraviolet absorber. The modified silicone resin foam according to any one of claims 1 to 3, wherein the ultraviolet absorber is a benzotriazole-based ultraviolet absorber. The modified silicone resin foam according to any one of claims 1 to 4, wherein the hindered amino group of the hindered amine light stabilizer is> NR type. The modified silicone resin foam according to any one of claims 1 to 5, which has a density of 20 kg / m ³ or more and 700 kg / m ³ or less. A bedding using the modified silicone resin foam according to any one of claims 1 to 6. The bedding according to claim 7, wherein the bedding is a pillow or a mattress.