JP2010270242A - Modified silicone resin soft foam and bedclothes comprising the foam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a modified silicone resin soft foam having a high pliability and a low density. <P>SOLUTION: The modified silicone resin soft foam is obtained by curing a liquid resin composition containing (A) a curing agent having at least two hydrosilyl groups in the molecular chain, (B) a polymer which has at least one alkenyl group in the molecular chain, comprises oxyalkylene-based units as the repeating unit constituting the main chain, and has a molecular weight of ≥15,000, (C) a hydrosilylation catalyst, (D) a compound having at least one alkenyl group and at least one hydroxyl group in the molecular chain, (E) a foaming agent which is an active hydrogen-containing compound free of an alkenyl group in the molecular chain and has a density of ≤150 kg/m<SP>3</SP>. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Soft foams using modified silicone resins are superior in flexibility and touch compared to polyurethane soft foams, which are general soft foams, so they can be used for bedding such as pillows and various cushion materials. Is expected (Patent Document 1).

  Patent Document 1 discloses a curing agent having at least two hydroxyl groups in a molecular chain, at least one alkenyl group in the molecular chain, and a repeating unit constituting the main chain is a saturated hydrocarbon unit or an oxy group. A silicon-based polymer foam obtained by effecting a foamable resin composition comprising a polymer comprising an alkylene-based unit, a hydrosilylation catalyst, and a foaming agent is disclosed. Patent Document 2 discloses a resin foam obtained by curing a mixture containing an alkenyl group-containing compound, a hydrosilyl group-containing compound, and a hydrosilylation catalyst. In any document, an active hydrogen group-containing compound is exemplified as a foaming agent. However, when a compound having a hydrosilyl group and an alkenyl group is used as the active hydrogen group-containing compound, the foamability is reduced or It has been suggested that the mechanical strength can be lowered, and Patent Document 1 discloses a relational expression of an appropriate amount of a hydrosilyl group and an alkenyl group in a polymer, a curing agent, and a foaming agent.

In addition, the above-mentioned Patent Document 1 discloses a wide range of foam density. Usually, a modified silicone resin soft foam is produced by competition between curing and foaming. It is difficult to increase the magnification. For example, as the smallest foam density in Patent Document 1, only a foam having a specific density of 171 kg / m ³ is disclosed in the examples. Patent Document 2 discloses a relatively low-density foam as a silicone-based soft foam having water absorption, but there is no disclosure regarding flexibility regarding the foam.

  As described above, until now, there has been virtually no modified silicone resin soft foam having high flexibility and low density.

International Publication No. 2008/117734 International Publication No. 2008/32697

  An object of the present invention is to provide a modified silicone resin soft foam having high flexibility and low density.

As a result of intensive studies for solving the above problems, the present inventors have found that a blowing agent which is an active hydrogen group-containing compound having no alkenyl group in the molecular chain and at least one alkenyl group in the molecular chain. And a compound having a density of 150 kg / m ³ or less without impairing the advantages of the modified silicone resin foam, such as high flexibility and excellent usability, by using a compound having at least one hydroxyl group. The inventors have found that a silicone resin soft foam can be obtained, and have reached the present invention.

That is, this invention consists of the following structures.
[1] A curing agent (A) having at least two hydrosilyl groups in the molecular chain, a number having at least one alkenyl group in the molecular chain, and the repeating unit constituting the main chain consisting of oxyalkylene units Polymer (B) having an average molecular weight of 15000 or more, hydrosilylation catalyst (C), compound (D) having at least one alkenyl group and at least one hydroxyl group in the molecular chain, alkenyl group in the molecular chain A modified silicone resin soft foam having a density of 150 kg / m ³ or less, which is obtained by curing a liquid resin composition comprising a foaming agent (E), which is an active hydrogen group-containing compound that does not have a hydrogen atom.
[2] The modified silicone resin soft foam according to [1], wherein the curing agent (A) / the polymer (B) (mol / mol) is 3/4 or more.
[3] The modified silicone resin soft foam according to [1] or [2], wherein the compound (D) / the polymer (B) (mol / mol) is 6 or more.
[4] The modified silicone resin soft foam according to any one of [1] to [3], wherein the Asker FP hardness at 25 ° C. is 50 or less.

The modified silicone resin soft foam of the present invention has high flexibility and a low density of 150 kg / m ³ or less. Therefore, when it is used as bedding such as pillows or various cushion materials, it becomes flexible and lightweight, so that it can be suitably used.

  Hereinafter, the present invention will be described in more detail.

  The modified silicone resin constituting the foam of the present invention comprises a curing agent (A) having at least two hydrosilyl groups in the molecular chain, and at least one alkenyl group in the molecular chain, constituting the main chain. A polymer (B) having a number average molecular weight of 15000 or more, wherein the repeating unit is an oxyalkylene unit, a hydrosilylation catalyst (C), a compound having at least one alkenyl group and at least one hydroxyl group in the molecular chain (D) A liquid resin composition containing a foaming agent (E), which is an active hydrogen group-containing compound having no alkenyl group in the molecular chain, is cured.

  The curing agent (A) having at least two hydrosilyl groups in the molecular chain (hereinafter sometimes simply referred to as “curing agent (A)”) is at least 2, preferably 3 or more in the molecular chain. It has a hydrosilyl group. The upper limit of the number of hydrosilyl groups is preferably 100, more preferably 70, and even more preferably 50. Since the hydrosilyl group is thus contained in the molecular chain, each hydrosilyl group has at least one alkenyl group in the molecular chain, and a polymer in which the repeating unit constituting the main chain is an oxyalkylene unit ( It cures by reacting with the alkenyl group present in the molecular chain of B). When the number of the hydrosilyl groups is less than 2, the curing rate when the liquid resin composition of the present invention is cured by a hydrosilylation reaction is slowed, resulting in poor curing. When the number of hydrosilyl groups exceeds 100, the stability of the curing agent (A), that is, the stability of the liquid resin composition may be deteriorated, and a large amount of hydrosilyl groups are foamed even after curing. It tends to remain in the body and may cause cracks.

In addition, having one hydrosilyl group means having one SiH bond, and in the case of SiH ₂ , it has two hydrosilyl groups, but the number of H bonded to one Si is 1 It is preferable from the standpoint of flexibility, since the curability is better.

  The number average molecular weight (Mn) of the curing agent (A) is preferably 30000 and more preferably 20000 from the viewpoints of dispersibility of the foaming agent and processability of the resulting modified silicone resin soft foam. 15000 is more preferable. In consideration of the reactivity and compatibility with the polymer (B), the number average molecular weight is particularly preferably from 300 to 10,000.

  The structure of the curing agent (A) is not particularly limited as long as it has at least two hydrosilyl groups in the molecular chain, and examples thereof include a polysiloxane curing agent described in Patent Document 1. In particular, from the viewpoint of availability, reactivity, and the like, polymethylhydrogensiloxane (methylhydrogensilicone oil), methylhydrogensiloxane and dimethylsiloxane, diphenylsiloxane, methylphenylsiloxane copolymer, and these A modified product of styrene or α-methylstyrene is preferably used.

  A polymer (B) having at least one alkenyl group in the molecular chain and having a number average molecular weight of 1500 or more in which the repeating unit constituting the main chain is an oxyalkylene unit (hereinafter simply referred to as “polymer (B)” Is a component that is cured by a hydrosilylation reaction with the curing agent (A), and has at least one alkenyl group in the molecular chain. And harden. 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.

  The structure of the polymer (B) may be linear or branched, but the linear structure is preferable from the viewpoint of flexibility. Here, the term “linear” means that the molecular structure is linear or may be branched to some extent, but if the branching is less than the molecular weight of the main chain, it will be linear.

  As for the molecular weight of the polymer (B), the number average molecular weight (Mn) is 15000 or more from the viewpoint of the balance of flexibility / tactile sensation and reactivity. Preferably, it is 16000 or more, More preferably, it is 17000 or more. Although there is no limitation in particular in an upper limit, 50000 or less are preferable, 45000 or less are more preferable, and 40000 or less are more preferable.

The polymer (B) is preferably produced by polymerizing a compound having two or more active hydrogens as a starting material for forming the main chain because the repeating unit constituting the main chain is an oxyalkylene-based unit. . For example, it is produced by polymerizing C ₂ -C ₄ alkylene oxide using ethylene glycol, propylene glycol, bisphenol compound, glycerin, trimethylolpropane, pentaerythritol and the like.

  Specific examples of the main chain include two or more random or block copolymers of polyethylene oxide, polypropylene oxide, polybutylene oxide, ethylene oxide, propylene oxide and butylene oxide, and at least one selected from these groups It is preferable to introduce an alkenyl group at the end of each. As a more preferred polymer (B), the repeating unit of the main chain is propylene oxide from the viewpoint of flexibility and touch.

  Although the content ratio of the curing agent (A) and the polymer (B) depends on the number of hydrosilyl groups in the curing agent (A) and the number of alkenyl groups in the polymer (B), The curing agent (A) / polymer (B) (mol / mol) is preferably 3/4 or more, more preferably 4/5 or more, and even more preferably 1 or more.

  Furthermore, it is preferable that the content of the hydrosilyl group in the curing agent (A) is 0.1 mol or more and 50 mol or less per mol of the alkenyl group in the polymer (B), and 0.2 mol or more. More preferably, the amount is 30 mol or less.

  The hydrosilylation catalyst (C) is not particularly limited as long as it can be used as a hydrosilylation catalyst, and any catalyst can be used. Specific examples of the hydrosilylation catalyst (C) include those described in Patent Document 1, such as platinum-olefin complexes and platinum-vinylsiloxane complexes.

The content of the hydrosilylation catalyst (C) is preferably 10 ^-8 mol or more and 10 ^-1 mol or less, more preferably 10 ^-6 mol or more and 10 ^-3 mol or less, with respect to 1 mol of the alkenyl group of the polymer (B). preferable. If the content is less than 10 ⁻⁸ mol, curing may not proceed sufficiently. When addition is greater than 10 ^-1 mol, if the control is difficult and the curing of the liquid resin composition, the resulting modified silicone resin soft foam sometimes colored.

  In the present invention, adding a compound (D) having at least one alkenyl group and at least one hydroxyl group in the molecular chain (hereinafter sometimes simply referred to as “compound (D)”) This is an important feature for obtaining a low density modified silicone resin soft foam. The alkenyl group in the compound (D) competes with the alkenyl group in the polymer (B) to cause an addition reaction to the hydrosilyl group in the curing agent (A), thereby delaying the crosslinking reaction and It is considered that the density of the modified silicone resin soft foam can be reduced by generating hydrogen as a result of the condensation reaction between the hydroxyl group and the hydrosilyl group in the curing agent (A). However, when a cross-linked structure via compound (D) is introduced by the addition reaction and the condensation reaction, problems such as a decrease in mechanical strength and an increase in hardness may occur. As described above, the number average molecular weight (Mn) of the polymer (B) was set to 15000 or more to achieve both low density and flexibility. Although it is possible to improve the magnification by adding a large amount of a foaming agent (E), which is an active hydrogen group-containing compound other than the compound (D), which will be described later, or by adding other foaming agents, the resulting modified silicone resin From the viewpoint of the hardness and physical property balance of the soft foam, the addition of the compound (D) of the present invention is excellent.

As a compound (D), the following can be illustrated typically.
Monohydric alcohols such as ethylene glycol monoallyl ether and glyceryl diallyl ether;

Polyhydric alcohols such as glyceryl monoallyl ether;

One terminal allyl ether, vinyl ether or (meth) acrylic acid ester of a polymer in which the repeating unit constituting the main chain such as polypropylene glycol, polyethylene glycol, and copolymers thereof is an oxyalkylene-based unit;

Polyethermethylene glycol, sorbitol, sucrose, tetraethylenediamine, ethylenediamine, etc. as an initiator, polyether polyol one-end allyl ether, vinyl ether or (meth) acrylic ester such as those containing 3 or more hydroxyl groups in one molecule ;

One-terminal allyl ether, vinyl ether or (meth) acrylic ester of polyester polyol such as adipate polyol, polycaprolactone polyol, polycarbonate polyol;

Polybutadiene polyol; castor oil-based unsaturated group-containing polyol;

2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxyethyl vinyl ether, N-methylol (meth) acrylamide, “Aronix 5700” manufactured by Toagosei Co., Ltd., 4-hydroxystyrene, “HE-10”, “HE-20”, “HP-10” and “HP-20” manufactured by Nippon Shokubai Chemical Industry Co., Ltd. [all of which are acrylic acid ester oligomers having a hydroxyl group at the terminal], Nippon Oil & Fats Co., Ltd. ) Made of PP series [polypropylene glycol methacrylate], BLEMMER PE series [polyethylene glycol monomethacrylate], BLEMMER PEP series [polyethylene glycol polypropylene glycol methacrylate], BLEMMER AP- 00 [polypropylene glycol monoacrylate], Blemmer AE-350 [polyethylene glycol monoacrylate], Blemmer NKH-5050 [polypropylene glycol polytrimethylene monoacrylate] and Blemmer GLM [glycerol monomethacrylate], hydroxyl group-containing vinyl compounds and ε- Hydroxyl group-containing vinyl monomers such as ε-caprolactone modified hydroxyalkyl vinyl monomers obtained by reaction with caprolactone;
Alcohols such as;
Etc.

  Among these compounds, from the viewpoint of reactivity and handleability, polymer one-terminal allyl ether, vinyl ether or (meth) acrylic acid ester in which the repeating unit constituting the main chain is an oxyalkylene-based unit is preferable, and high doubling is achieved. One end terminal allyl ether of polypropylene glycol, polyethylene glycol, and copolymers thereof is more preferable, and one end allyl ether of polyethylene glycol is particularly preferable.

  The ratio of the compound (D) and the polymer (B) is such that the compound (D) / polymer (B) (mol / mol) is 6 or more in that a low density modified silicone resin soft foam can be obtained. Preferably, it is 7 or more, more preferably 8 or more.

  In the present invention, an active hydrogen group-containing compound having no alkenyl group in the molecular chain is used as the foaming agent (E).

  Examples of the active hydrogen-containing compound having no alkenyl group in the molecular chain include alcohols, carboxylic acids, compounds having a phenolic hydroxyl group, and water. Specific examples include water;

Methanol, ethanol, n-propanol, iso-propanol, n-butanol, iso-butanol, tert-butanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, Monohydric alcohols such as ethylene glycol monophenyl ether;

Ethylene glycol, propylene glycol, 1,4-butylene glycol, 1,3-butylene glycol, 2,3-butylene glycol, diethylene glycol, triethylene glycol, neopentyl glycol, 1,6-hexamethylene glycol, 1,9-nona Polyhydric alcohols such as methylene glycol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, sucrose;

Polyether polyols including polypropylene glycol, polyethylene glycol, copolymers thereof, polytetramethylene glycol, sorbitol, sucrose, tetraethylenediamine, ethylenediamine, etc. containing one or more hydroxyl groups in one molecule ;

Polyester polyols such as adipate polyols, polycaprolactone polyols, polycarbonate polyols;

Epoxy-modified polyols; polyether ester polyols; phenolic polyols such as benzylic ether type phenol polyols; fluorine polyols such as Lumiflon (Asahi Glass Co., Ltd.); hydrogenated polybutadiene polyols; castor oil-based polyols; halogen-containing flame-retardant polyols; Flame retardant polyol;

An acrylic resin having a hydroxyl group that can be obtained by copolymerization of a hydroxyl group-containing vinyl monomer with acrylic acid, methacrylic acid, or a derivative thereof; a resin having a hydroxyl group such as an alkyd resin or an epoxy resin;
Alcohols such as;

Carboxylic acids such as monovalent saturated carboxylic acids such as acetic acid and propionic acid; compounds having a phenolic hydroxyl group such as phenol, cresol, xylenol, resorcin, catechol, pyrogallol, bisphenol A, bisphenol B, bisphenol S, and phenol resin;
Etc.

  Among these active hydrogen group-containing compounds that do not contain an alkenyl group in the molecular chain, primary saturated hydrocarbon alcohols such as methanol, ethanol, n-propanol and n-butanol, poly It is preferably at least one selected from the group consisting of ether polyols and water, and from the viewpoint of imparting flexibility and moisture permeability, a compound in which oxygen is directly bonded to carbon or water is preferable. In particular, any of water, ethanol, and polyethylene glycol is preferable.

  In the present invention, the hydroxyl equivalent in an active hydrogen group-containing compound that does not contain an alkenyl group in the molecular chain is such that when the hydroxyl equivalent becomes small, the volume of the active hydrogen group-containing compound to be added increases and the expansion ratio is difficult to increase. 0.1 mmol / g or more is preferable, and 0.5 mmol / g or more is more preferable from the viewpoint of reactivity.

  In the present invention, the blending ratio of the curing agent (A), the polymer (B), the compound (D), and the foaming agent (E) is appropriately selected depending on the structure of each compound, the target foaming ratio, and the target physical properties. Although not particularly limited, the number of moles of hydrosilyl groups in the curing agent (A): x, the number of moles of alkenyl groups in the polymer (B) and the compound (D): y and the blowing agent ( The ratio of the number of moles of hydroxyl groups in E) and compound (D) to the sum of z is preferably x / (y + z) = 1/10 to 50/1, and x / (y + z) = 1 / More preferably, it is 5-30 / 1, and it is further more preferable that it is x / (y + z) = 1 / 2-20 / 1. If x / (y + z) exceeds 50/1, the crosslinking density may be low, and sufficient mechanical strength may not be obtained. If x / (y + z) is less than 1/10, sufficient foaming, Curing may not occur.

  The ratio of the number of moles of alkenyl groups of polymer (B) and compound (D): y to the number of moles of hydroxyl groups of foaming agent (E) and compound (D): z is not particularly limited. Can be selected as appropriate depending on the expansion ratio, the desired physical properties, the skeleton of the curing agent (A), and the type of the foaming agent (E). In general, y: z = 100: 1 to 1: 100 is preferable, and y: z = 10: 1 to 1:20 is more preferable.

  In the modified silicone resin soft foam of the present invention, a foaming agent that is an active hydrogen group-containing compound not having an alkenyl group in the molecular chain, if necessary, within a range not impairing the effects of the present invention ( A foaming agent other than E) may be used. The foaming agent other than the foaming agent (E) which is an active hydrogen group-containing compound having no alkenyl group in the molecular chain is not particularly limited. For example, usually, polyurethane, phenol, polystyrene, polyolefin, etc. Examples thereof include volatile liquid and gaseous physical foaming agents used in organic foams, and chemical foaming agents that generate gas by thermal decomposition or chemical reaction.

  The physical foaming agent is not particularly limited as long as it does not inhibit the hydrosilylation reaction, but from the viewpoint of foamability, workability and safety, the physical foaming agent has a boiling point of 100 ° C. or less. Preferably, 50 degrees C or less is more preferable. Specific examples include organic compounds such as hydrocarbons, chlorofluorocarbons, alkyl chlorides and ethers, and inorganic compounds such as carbon dioxide, nitrogen and air. From the viewpoint of environmental compatibility, hydrocarbons, ethers, carbon dioxide and nitrogen. It is preferable to use a compound selected from air.

  Hydrocarbons include methane, ethane, propane, n-butane, isobutane, n-pentane, isopentane, neopentane, n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, 2,3- Examples thereof include dimethyl butane crobutane, cyclopentane, and cyclohexane. Examples of ethers include dimethyl ether, diethyl ether, ethyl methyl ether, dipropyl ether, diisopropyl ether, butyl methyl ether, butyl ethyl ether, tert-butyl methyl ether, tert-butyl ethyl ether, 1,1-dimethylpropyl methyl. Examples include ether.

  In addition, when performing mechanical stirring in the air at the time of foam manufacture, air bubbles may be formed by the air entrained with the stirring, which is also considered to be one of physical foaming agents. However, when these physical foaming agents are used, there are concerns about changes in physical properties after foam molding due to the residue, etc., and therefore by heating and curing at a temperature equal to or higher than the boiling point of the used physical foaming agent after foam production. It is preferable to remove the residual foaming agent.

The chemical foaming agent is not particularly limited as long as it does not inhibit the hydrosilylation reaction, and examples thereof include inorganic chemical foaming agents such as NaHCO ₃ and organic chemical foaming agents.

  Further, for the purpose of improving the compatibility of the liquid resin composition comprising the curing agent (A), the polymer (B), the hydrosilylation catalyst (C), the compound (D), and the foaming agent (E), a surface active agent is used. An agent can also be added. Specific examples include alkyl sulfates such as sodium lauryl sulfate, polyoxyethylene alkyl ether sulfates such as sodium polyoxyethylene lauryl ether sulfate, polyoxyethylene alkyl ether acetates, lauryl trimethyl ammonium chloride, alkoxypropyl trimethyl ammonium chloride, Dialkyldimethylammonium chloride, benzalkonium chloride solution, alkyldimethylaminoacetic acid betaine, alkyldimethylamine oxide, alkylcarboxymethylhydroxyethylimidazolinium betaine, alkylamidopropyl betaine, glycerin fatty acid ester, propylene glycol fatty acid ester, sorbitan fatty acid ester, etc. Nonionic surfactants, etc., and one or two or more of them can be used. That.

  Furthermore, if necessary, the liquid resin composition comprising the curing agent (A), the polymer (B), the hydrosilylation catalyst (C), the compound (D), and the foaming agent (E) has storage stability. Storage stability improvers may be added to improve. 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.

  Preferable 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.

The amount of the storage stability improver used can be selected almost arbitrarily as long as it is uniformly dispersed in the curing agent (A) and the polymer (B), but with respect to 1 mol of SiH groups in the curing agent (A), It is preferably used in the range of 10 ⁻⁶ mol or more and 10 ⁻¹ mol or less. When the amount used is less than 10 ^-6 mol, the storage stability of the curing agent (A) may not be sufficiently improved, and when it exceeds 10 ^-1 mol, the curability may be insufficient.

  If necessary, a bubble regulator may be added to the modified silicone resin soft foam of the present invention. There are no particular limitations on the type of foam regulator, and commonly used, for example, inorganic solid powders such as talc, calcium carbonate, magnesium oxide, titanium oxide, zinc oxide, carbon black, silica, and polyether-modified silicone oil These silicone oil compounds and fluorine compounds can be used, and at least one selected from these groups can be used. The amount of the foam regulator used is 0.1 to 100 parts by weight when the total amount of the curing agent (A), polymer (B), hydrosilylation catalyst (C) and compound (D) is 100 parts by weight. Part by weight or less is preferable, and 0.5 part by weight or more and 50 parts by weight or less is more preferable.

  The method for producing the modified silicone resin soft foam is not particularly limited. For example, the modified silicone resin contains a curing agent (A), a polymer (B), a hydrosilylation catalyst (C), and a compound (D). When using the liquid resin which becomes, it can manufacture as follows.

  A curing agent (A), a polymer (B), and a hydrosilylation catalyst (C) are mixed in advance, and optional components such as a foaming agent (E), a compound (D), and a cell regulator are added and stirred. The modified silicone resin soft foam is obtained by mixing and adjusting, pouring into a mold, or curing on a base material on a belt conveyor.

  More specifically, a polymer (B), a hydrosilylation catalyst (C), a compound (D) having at least one alkenyl group in the molecular chain, and the repeating unit constituting the main chain being an oxyalkylene-based unit. ), A foaming agent (E) and other optional components as necessary are added and mixed to form a liquid resin composition, which is then poured into a mold or a substrate on a belt conveyor. The modified silicone resin soft foam of the present invention can be obtained by foaming the liquid resin composition under appropriate conditions before being cured or by foaming simultaneously with curing.

The modified silicone resin soft foam of the present invention has a density of 150 kg / m ³ or less. Preferably it is 140 kg / m ³ or less, more preferably 130 kg / m ³ or less. When the density is higher than the above, for example, when it is commercialized as a bedding or a cushion, it becomes heavy and difficult to carry on a daily basis. The lower limit is not particularly limited, but is preferably 30 kg / m ³ or more, more preferably 50 kg / m ³ or more, and particularly preferably 70 kg / m ³ or more. When the density is not more than the above, when used as a bedding or cushion, it may bottom out due to compression and may not be suitable for practical use.

  In the present invention, the Asker FP hardness is a value obtained by measurement using an Asker FP hardness meter (manufactured by Kobunshi Keiki Co., Ltd.). The modified silicone resin soft foam of the present invention preferably has an Asker FP hardness of 50 or less at 25 ° C., more preferably 30 or less, and even more preferably 20 or less. If it is the said range, it can be said that it is a flexible tactile sense.

  The modified silicone resin soft foam of the present invention obtained as described above does not contain a substance that may cause harmful by-products, is highly flexible, has good tactile sensation, and is lightweight and easy to carry. It is. Therefore, it can be suitably used as bedding. Examples of bedding include pillows and mattresses.

  When the modified silicone resin soft foam is used as a bedding, it can be used as it is, or a skin layer formed at the time of foam molding is cut, cut into an appropriate shape, or punched out. Or, if it is in a range that makes use of the features that are flexible and have good tactile sensation, it is integrally formed with raw materials such as unfoamed plastic, modified silicone resin soft foam with different expansion ratio, film, cloth, nonwoven fabric, paper, fiber, etc. The surface of the modified silicone resin soft foam may be used in combination with woven or non-woven fabric made of cotton, acrylic fiber, hair, polyester fiber, etc. .

  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.

<Asker FP hardness measurement method>
After curing the sample at 25 ° C. for 3 hours or more, an ASKER FP type hardness tester was gently placed and evaluated according to the indicated value. Depending on the sample, the indicated value may decrease over time, so the value immediately after placing the hardness meter was read.

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

Example 1
To 100 parts of polymer B-1, 20 parts of compound D-1, 9.2 parts of blowing agent E-1 and 0.21 part of catalyst C-1 are added and mixed thoroughly, and further cured. 16 parts of Agent A-1 was added and mixed quickly. This mixture was poured into a mold and cured by heating in an oven set at 40 ° C. for 60 minutes to obtain a modified silicone resin soft foam. The density of the obtained flexible foam was 105 kg / m ³ . The other evaluation results are shown in Table 2.

(Example 2)
To 100 parts of polymer B-1, 12 parts of compound D-1, 9.2 parts of foaming agent E-1 and 0.21 part of catalyst C-1 are added and mixed thoroughly, and further cured. 8.4 parts of Agent A-1 was added and quickly mixed. This mixture was poured into a mold and cured by heating in an oven set at 40 ° C. for 60 minutes to obtain a modified silicone resin soft foam. The density of the obtained flexible foam was 148 kg / m ³ . The other evaluation results are shown in Table 2.

(Example 3)
To 100 parts of polymer B-1, 13.3 parts of compound D-1, 9.2 parts of blowing agent E-1 and 0.21 part of catalyst C-1 are added and mixed thoroughly. Then, 12 parts of curing agent A-1 was added and quickly mixed. This mixture was poured into a mold and cured by heating in an oven set at 40 ° C. for 60 minutes to obtain a modified silicone resin soft foam. The density of the obtained flexible foam was 135 kg / m ³ . The other evaluation results are shown in Table 2.

(Comparative Example 1)
To 100 parts of polymer B-1, 7.7 parts of foaming agent E-1 and 0.03225 parts of catalyst C-1 are added and mixed thoroughly, and 12 parts of curing agent A-1 are further added. And mixed quickly. This mixture was poured into a mold and heat-cured in an oven set at 40 ° C. for 60 minutes to obtain a foam using a modified silicone resin as a base resin. The density of the obtained foam was 256 kg / m ³ . The other evaluation results are shown in Table 2.

(Comparative Example 2)
To 100 parts of polymer B-2, 22 parts of compound D-1, 7 parts of foaming agent E-1 and 0.6 part of catalyst C-1 are added and mixed thoroughly. 13 parts of -1 was added and mixed rapidly. This mixture was poured into a mold and heat-cured in an oven set at 40 ° C. for 60 minutes to obtain a foam using a modified silicone resin as a base resin. The density of the obtained foam was 60 kg / m ³ . The other evaluation results are shown in Table 2.

  From the above results, it is understood that the foam of the present invention is lightweight and excellent in flexibility.

(Examples 4 to 6)
Pillows were manufactured using the materials of Examples 1-3. As a result of using these pillows as bedding, the sleeping comfort was good and the bedding was good.

Claims (5)

The curing agent (A) having at least two hydrosilyl groups in the molecular chain, the number average molecular weight having at least one alkenyl group in the molecular chain, and the repeating unit constituting the main chain consisting of oxyalkylene units. 15,000 or more polymers (B), hydrosilylation catalyst (C), compound (D) having at least one alkenyl group and at least one hydroxyl group in the molecular chain, and having an alkenyl group in the molecular chain A modified silicone resin soft foam having a density of 150 kg / m ³ or less, which is obtained by curing a liquid resin composition comprising a foaming agent (E), which is an active hydrogen group-containing compound.   The modified silicone resin soft foam according to claim 1, wherein the curing agent (A) / the polymer (B) (mol / mol) is 3/4 or more.   The modified silicone resin soft foam according to claim 1 or 2, wherein the compound (D) / the polymer (B) (mol / mol) is 6 or more.   The modified silicone resin soft foam according to any one of claims 1 to 3, wherein the Asker FP hardness at 25 ° C is 50 or less.   A bedding using the modified silicone resin soft foam according to any one of claims 1 to 4.