JP2003306478A - Peroxide composition having low viscosity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curing agent using a substance not having endocrine disrupter action as a diluent for peroxides, reducing a difference of the discharge amounts by temperatures and reducing dispersion of the amount added, particularly in spray up molding and having good dispersibility with a resin in order to reduce deforming operation. <P>SOLUTION: A peroxide composition having a low viscosity comprises an ester (fatty acid esters) of a 3-12C polyhydric alcohol with a 1-5C aliphatic carboxylic acid, e.g. 2,2,4-trimethyl-1,3-pentanediol diisobutylate as the diluent for peroxides. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a peroxide composition suitable for curing a thermosetting resin such as an unsaturated polyester resin, a vinyl ester resin or an acrylic resin.

[0002]

2. Description of the Related Art Thermosetting resins such as unsaturated polyester resins, vinyl ester resins and acrylic resins are cured as a curing agent by a method such as room temperature curing or heat curing to obtain reinforced plastics and non-reinforced plastics. Widely used. For example, reinforced plastics are those that use glass fibers as a reinforcing agent and unsaturated polyester resin, vinyl ester resin or acrylic resin as a matrix, and are cured at room temperature and used for housing such as bathtubs and septic tanks, fishing boats, yachts, boats, etc. It is used for products related to plants such as ships, pipes, and tanks. As a non-FRP, it is cured at room temperature and is put to practical use in paints, linings, castings, decorative boards, laminated boards and the like.

When heat-curing, a thermosetting resin such as unsaturated polyester resin, vinyl ester resin or acrylic resin is used in addition to a thickener, a curing agent, a filler, a low-shrinking agent, a release agent, and a prohibition agent. Sheet molding compound (hereinafter abbreviated as SMC) by mixing agents, vinyl type monomers, etc.
Or bulk molding compound (hereinafter abbreviated as BMC) etc. (these SMC, BMC etc. are usually called molding materials) and then cast parts or various press molding such as compression molding, transfer molding, injection molding etc. , Molded into electric parts, housing equipment, housing materials, septic tanks, etc. and hardened.

As a curing agent for room temperature curing, a ketone peroxide such as methyl ethyl ketone peroxide or acetylacetone peroxide is used alone, a hydroperoxide such as cumene hydroperoxide and a metal such as cobalt naphthenate. Those which form a redox system in combination with soap and those which combine benzoyl peroxide with aromatic tertiary amines such as N, N-dimethylaniline are generally used. In addition, a curing agent that is generally used for heat curing is tertiary butyl peroxy-2-ethylhexanoate or tertiary butyl peroxybenzoate, etc. because of the good balance of curing speed and physical properties. is there. These curing agents are usually diluted with a diluent,
It is used as a curing agent. In particular, in the field of molding where ketone peroxide is used at room temperature curing, there is a transition from the hand lay-up molding method to the spray-up molding method. ing.

[0005]

However, in both room temperature curing and heat curing, the substances suspected of having endocrine disrupting action due to the endocrine problem in recent years tend to be shunned. With the evasion of styrene monomers in resins, phthalic acid esters and the like contained as a diluent in the curing agent have begun to evade. Therefore, there is a demand for a curing agent that uses a substance that is not suspected to have an endocrine disrupting action as a peroxide diluent. Further, in the case of spray-up molding of room temperature curing, a curing agent using dimethyl phthalate as a diluent has a relatively large fluctuation in viscosity due to a temperature difference, and in order to keep the discharge rate constant, it may be delicate depending on the temperature change. In addition to the need to adjust the discharge rate, the work efficiency is also reduced because the viscosity becomes high especially at low temperatures such as in winter. Therefore, even when the temperature is low such as in winter, the increase in viscosity is small and the work efficiency is prevented from lowering, and even if there is some temperature change during spray-up molding, the difference in discharge amount is small and the addition amount varies. Strong demand for less curing agent. The present invention is intended to solve the above problems, and as a peroxide diluent,
In addition to using a substance that does not have an endocrine disrupting effect, in spray-up molding, the viscosity does not increase even at low temperatures such as in winter, and the discharge rate does not change significantly even if there is some temperature change. Improves dispersibility with
It is intended to provide a peroxide composition that can reduce defoaming work and the like.

[0006]

Means for Solving the Problems As a result of earnest research to achieve the object of the first aspect, the present inventors have found that the problem can be solved by using esters other than phthalic acid ester as a diluent for peroxide. Heading, completed the present invention.

That is, the present invention is as follows: A low-viscosity peroxide composition containing an ester other than phthalates (excluding those having a hydroxy group or an alkoxy group as a substituent in the ester group) as a peroxide diluent. 2. 2. A low-viscosity peroxide composition containing an ester of a polyhydric alcohol having 3 to 12 carbon atoms and an aliphatic carboxylic acid having 2 to 7 carbon atoms as a peroxide diluent. 3. A peroxide composition for thermosetting resin curing, which comprises an ester of a polyhydric alcohol having 3 to 12 carbon atoms and an aliphatic carboxylic acid having 2 to 7 carbon atoms as a peroxide diluent. 4. The peroxide composition according to the above item 2 or 3, wherein the polyhydric alcohol is a hyperbranched diol or triol. 5. The peroxide composition according to any one of the above items 2 to 4, wherein the aliphatic carboxylic acid having 2 to 7 carbon atoms is a branched aliphatic carboxylic acid having 3 to 6 carbon atoms; 6. The peroxide composition according to any one of items 3 to 5, wherein the thermosetting resin is an unsaturated polyester resin, a vinyl ester resin, or an acrylic resin. The peroxide composition according to any one of the above items 1 to 6, wherein the content of the ester as the diluent is 30 to 70% by mass with respect to the entire composition, and the viscosity at 8.5 ° C. is 40 mPas. The peroxide composition according to any one of the above items 1 to 7, which is s or less. 9. The peroxide composition according to any one of items 1 to 8, wherein the ester of a polyhydric alcohol and an aliphatic carboxylic acid is 2,2,4-trimethyl-1,3-pentanediol diisobutyrate. , 10. A method for curing an unsaturated polyester resin, a vinyl ester resin or an acrylic resin, which comprises using the peroxide composition according to any one of the above items 1 to 9.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. Esters other than the phthalic acid esters used as the diluent in the present invention (excluding those having a hydroxy group or an alkoxy group as a substituent in the ester group) are liquid at room temperature and have good compatibility with peroxides. Any low viscosity can be used. Examples of such an ester include an ester of a polyhydric alcohol having 3 to 12 carbon atoms and an aliphatic carboxylic acid having 2 to 10 carbon atoms (hereinafter sometimes referred to as fatty acid ester). For example, a polyhydric alcohol having 3 to 12 carbon atoms,
Preferably, a branched polyhydric alcohol having 5 to 10 carbon atoms, more preferably a highly branched polyhydric alcohol having 5 to 10 carbon atoms, for example, a diol or triol and 2 to 10 carbon atoms,
Preferably, the carbon number is 2 to 7, and more preferably, the carbon number is 3 to 6.
Examples thereof include esters with aliphatic carboxylic acids such as aliphatic monocarboxylic acids, and polyvalent esters such as di- or triesters are more preferable. When the low-viscosity ester is used, the resulting peroxide composition has good dispersibility in a resin and improves the physical properties of a molded article, which is preferable. In the present invention, the ester of a polyhydric alcohol and a carboxylic acid is, of course, not limited to an ester obtained by reacting a polyhydric alcohol and a carboxylic acid, and a reactive derivative thereof is reacted. Even if it is obtained as a result, it is used in the sense of including all those in the form of an ester of a polyhydric alcohol and a carboxylic acid as a result.

Examples of the polyhydric alcohol having 3 to 12 carbon atoms used for the ester include 1,2-dihydroxypropane, 1,2-dihydroxyisobutane, 1,3-
Dihydroxy-2-methylbutane, 1,3-dihydroxy-2-methylpentane, 2,3-dihydroxy-4-
Methyl pentane, 1,3-dihydroxy-2,4-dimethylpentane, 1,3-dihydroxy-2,2,4-trimethylpentane, 1,5-dihydroxy-2-methylhexane, 1,3-dihydroxy-2, 4-dimethylhexane, 1,3-dihydroxy-2, 2,4-trimethylhexane and the like can be mentioned. Examples of the aliphatic monocarboxylic acid having 2 to 10 carbon atoms used for the ester include acetic acid, propionic acid, butanoic acid, pentanoic acid, hexanoic acid, octanoic acid, nonanoic acid, decanoic acid and the like. Those that can be branched and can be branched may be branched. Of these, aliphatic monocarboxylic acids having 3 to 6 carbon atoms are preferable, and isobutanoic acid is most preferable. Preferable examples of the fatty acid ester include esters of the above fatty acid and the above polyhydric alcohol, and the most representative ester (diluent) is 2,2,4-trimethyl-1,3-pentanediol diisobutene. Chillate (Eastman
TXIB: trade name, manufactured by Eastman Chemical) (hereinafter abbreviated as TXIB).

As the peroxide in the present invention,
(1) Methyl ethyl ketone peroxide (hereinafter MEKP
Abbreviated as O), ketone peroxides such as acetylacetone peroxide, (2) hydroperoxides such as cumene hydroperoxide, (3) diacyl peroxides such as benzoyl peroxide,
(4) Dialkyl peroxides, (5) 1.1-di-tert-butyl peroxy-3.3.5-trimethylcyclohexanone, 1.1-di-tertiary amyl peroxy-3.3.5- Trimethylcyclohexanone, 1.1-di-tert-hexylperoxy-
3.3.5-Trimethylcyclohexanone, 1.1-Di-tert-octylperoxy-3.3.5-trimethylcyclohexanone, 1.1-di-tert-butylperoxycyclohexane, 1.1-di-tertiary Liamyl peroxycyclohexane, 1.1-di-tert-hexyl peroxycyclohexane, 1.1
-Peroxyketals such as di-tertiary octyl peroxycyclohexane,

(6) Tertiary Butyl Peroxy Neodecanoate, Tertiary Amyl Peroxy Neo Decanoate, Tertiary Hexyl Peroxy Neo Decanoate, Tertiary Octyl Peroxy Neo Decanoate, Tertiary Butyl Per Oxy 2-ethyl hexanoate, tertiary amyl peroxy 2-ethyl hexanoate, tertiary hexyl peroxy 2-ethyl hexanoate, tertiary octyl peroxy 2-ethyl hexanoate, tertiary butyl peroxy iso Butyrate, tertiary amyl peroxyisobutyrate, tertiary hexyl peroxyisobutyrate, tertiary octyl peroxyisobutyrate, tertiary butyl peroxy 3.5.5. Trimethylhexanoate, tertiary amyl peroxy 3.5.5. Trimethylhexanoate, tertiary hexyl peroxy 3.5.5. Trimethylhexanoate, tertiary octyl peroxy 3.5.5. Alkyl peresters such as trimethylhexanoate, tert-butyl peroxybenzoate, tert-amyl peroxybenzoate, tert-hexyl peroxybenzoate, tert-octyl peroxybenzoate,

(7) Di-2-ethylhexyl peroxydicarbonate, bis (4-tertiary butyl cyclohexyl) peroxy dicarbonate, tertiary butyl peroxy isopropyl carbonate, tertiary amyl peroxy isopropyl carbonate, tertiary hexyl per Oxyisopropyl carbonate,
Tertiary octyl peroxy isopropyl carbonate, tertiary butyl peroxy 2-ethylhexyl carbonate, tertiary amyl peroxy 2-ethylhexyl carbonate, tertiary hexyl peroxy 2-ethylhexyl carbonate, tertiary octyl peroxy 2-ethylhexyl carbonate,
1.6-bis (tertiarybutylperoxycarbonyloxy) hexane, 1.6-bis (tertiarymilperoxycarbonyloxy) hexane, 1.6-bis (tertiaryhexylperoxycarbonyloxy) hexane, 1. There are percarbonates such as 6-bis (tertiaryoctylperoxycarbonyloxy) hexane. Among these peroxides, ketone peroxides are more preferable.

The content of the fatty acid ester contained in the peroxide composition of the present invention as a diluent is preferably as small as possible in consideration of the physical properties of the resin after curing, but the safety of the peroxide composition is better. It is determined in consideration of properties, viscosity, dispersibility in resin, and the like. Usually, the content of the ester is 5% or more, preferably 10% or more, more preferably 20% or more, most preferably 30% based on the whole composition.
%, The upper limit is appropriately determined, but it is usually 70% by mass or less, preferably 60% by mass or less, and more preferably 50% by mass or less. Moreover, the compounding quantity with respect to 100 mass parts of peroxide pure products in this composition is about 1-99 mass parts, and is 10-95 mass parts considering practicality. The content of peroxide in the peroxide composition is 30% by mass or more, preferably 40% by mass or more, more preferably 50% by mass or more, based on the entire composition.
Further, it is 95 mass% or less, preferably 90 mass% or less, more preferably 80 mass% or less, most preferably about 70 mass% or less.

The peroxide composition of the present invention has a low viscosity and is characterized by a small increase in viscosity particularly at low temperatures.
A preferable viscosity is 50 mPa · s or less, preferably 40 mPa · s or less, and more preferably 30 mPa · s or less at a temperature of 5 ° C. The viscosity decreases with increasing temperature. The peroxide composition of the present invention is
Other solvents and other additives may be included as needed, as long as the effects of the present invention are exhibited. However, it is preferable that a substance suspected of having an endocrine disrupting action such as a phthalate ester is substantially not contained.

The peroxide composition of the present invention can be obtained by mixing peroxide with the above fatty acid ester by a conventional method. When the peroxide is synthesized, the above fatty acid ester is used as a solvent for synthesis. It can also be obtained. For example, in the case of ketone peroxide, for example, a raw material ketone corresponding to the desired peroxide, the above-mentioned fatty acid ester, hydrogen peroxide solution and a condensation catalyst such as 50% sulfuric acid are mixed, and the mixture is mixed at room temperature or as needed. The peroxide composition of the present invention can be obtained by synthesizing a desired peroxide by synthesizing the desired peroxide, then separating the organic layer and, if necessary, dehydrating with a desiccant or the like.

The peroxide composition of the present invention is suitable for curing a thermosetting resin. The thermosetting resin has a polymerizable vinyl group in its component and is three-dimensionally cured by heating. Any of them can be used, but preferred examples are unsaturated polyester resins, vinyl ester resins and acrylic resins.

The unsaturated polyester resin is obtained by subjecting an unsaturated dibasic acid, if necessary a saturated dibasic acid in combination, to heat dehydration condensation with glycols, and the resulting reaction product with a vinyl monomer such as styrene. It is a resin obtained by diluting. Examples of unsaturated dibasic acids that can be used include maleic anhydride, fumaric acid, citraconic acid, chloromaleic acid and the like. Examples of the saturated dibasic acid that can be used include phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, adipic acid and sebacic acid. Examples of glycols that can be used include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, hexanediol, bisphenol A, and propylene oxide adducts.

The vinyl ester resin is a resin obtained by diluting an equivalent reaction product of polyepoxide and α, β-unsaturated monobasic acid with a vinyl monomer such as styrene. Examples of polyepoxides include nitrogen-containing polyepoxides such as epibis type glycidyl ethers such as bisphenol A and bisphenol F, novolac type glycidyl ethers, brominated glycidyl ethers, triglycidyl isocyanurates, and glycidyl esters such as phthalic acid and hexahydrophthalic acid. Examples thereof include glycol type glycidiether. Examples of unsaturated monobasic acids include acrylic acid, methacrylic acid, crotonic acid, cinnamic acid, sorbic acid and the like.

The acrylic resin is a (meth) acrylic acid ester (meaning an acrylic acid ester or a methacrylic acid ester; hereinafter the same) (for example, a lower alkyl ester such as methyl (meth) acrylate) alone or 50% by mass of the ester ( The following% represents mass% unless otherwise specified) or more, preferably 60% or more, more preferably 75% or more with a vinyl-based monomer. Examples of the vinyl-based monomer mixed with the (meth) acrylic acid ester include styrene, α-methylstyrene, vinyl acetate, vinyl chloride, vinylidene fluoride, vinylidene chloride, ethylene, maleic anhydride, maleic acid, and fumaric acid. , Butadiene, glycidyl methacrylate, acrylic acid, methacrylic acid, methyl acrylate, acrylonitrile, methacrylonitrile, acrylamide, monohydric alcohol or monohydric phenol having 2 to 18 carbon atoms in one molecule, and acrylic acid or methacrylic acid Ester reaction product of (1), a monoester reaction product of a dihydric alcohol having 2 to 4 carbon atoms in one molecule with acrylic acid or methacrylic acid, (meth) acrylic acid with a polyhydric alcohol or a lower alkoxy thereof For example ethylene glycol,
1,6-hexanediol, tetramethylolmethane,
Propylene glycol, polyethylene glycol, polypropylene glycol, dimethylolethane, 1,3-
Butanediol, 1,4-butanediol, neon pentyl glycol, trimethylolethane, dimethylolpropane, trimethylolpropane, pentaerythritol, dipentaerythritol, etc.) ester reaction products (two or more ester groups in one molecule) Those having), divinylbenzene, triallyl isocyanurate and the like. Two or more kinds of these vinyl monomers can be used in combination.

Using the peroxide composition of the present invention,
To cure a thermosetting resin such as a saturated polyester resin, a vinyl ester resin and an acrylic resin, a conventional curing method can be used as it is, except that the peroxide composition of the present invention is used as a curing agent. Usually, the unsaturated polyester resin, the vinyl ester resin or the acrylic resin may be cured together with the peroxide composition of the present invention by using a curing accelerator that forms a redox system, if necessary. Examples of the curing accelerator that forms a redox system include metal soaps and aromatic tertiary amines such as N, N-dimethylaniline.

When the unsaturated polyester resin, the vinyl ester resin or the acrylic resin is cured, the amount of the peroxide composition of the present invention used depends on the type of unsaturated polyester resin, the vinyl ester resin or the acrylic resin used and the curing temperature and Depending on the desired degree of curing, etc., the amount of peroxide is usually 0.3 to 7 with respect to the unsaturated polyester resin, vinyl ester resin or acrylic resin.
It is mass%, preferably 0.5 to 5 mass%. When a plurality of peroxides are used, the amount of peroxide used here means the total amount thereof.

Examples of metal soaps used as necessary in curing the thermosetting resin include cobalt soap and
Any metal soap such as manganese soap and copper soap that has a curing-accelerating action can be used. Preferable examples include cobalt naphthenate, manganese naphthenate, copper naphthenate, cobalt octenoate, copper octenoate and the like. These metal soaps can be used alone or in combination of two or more. The metal soap is usually used by dissolving it in paraffin hydrocarbon oil or aromatic hydrocarbon oil. The above-mentioned preferred metal soap is generally commercially available as a solution of a hydrocarbon-based solvent (usually a solution of about 3 to 10%).

The amount of the metallic soap used varies depending on the type of thermosetting resin (for example, unsaturated polyester resin, vinyl ester resin, acrylic resin, etc.) to be cured, the curing temperature, the desired degree of curing, and the like. The metal content of the resin is preferably 0.006 to 0.12% by mass, and more preferably 0.012 to 0.02 as the metal content.
It is 9% by mass. When using a metal soap solution having a concentration of about 3 to 10% by mass, an unsaturated polyester resin,
The solvent may be used in an amount of 0.1 to 3% by mass, preferably 0.2 to 2% by mass based on the vinyl ester resin or the acrylic resin.

The aromatic tertiary amines used as necessary for curing the thermosetting resin are, for example, N, N-dimethylaniline, N, N-dimethylaniline having an alkyl group having 1 to 5 carbon atoms. N-dialkylaniline, N, N-dialkyltoluidine, trialkylamine and the like can be mentioned, and preferably 0.2 mass with respect to a thermosetting resin (for example, unsaturated polyester resin, vinyl ester resin or acrylic resin). It can be used in the range of% or less.

Thermosetting resins that can be cured with the peroxide composition of the present invention, such as unsaturated polyester resins, vinyl ester resins or acrylic resins, are generally used as required with reinforcing materials, fillers, coloring agents, etc. It is possible to mix the ingredients of. Examples of the reinforcing material include glass fiber, examples of the filler include calcium carbonate, clay, silica, talc, and the like, and examples of the coloring agent include organic dyes or inorganic pigments. In addition, a low-contracting agent, a thickening agent, a release agent, etc. can be added if necessary. Examples of the low-shrinking agent include thermoplastic homopolymers or copolymers, examples of the thickening agent include oxides or hydroxides of alkaline earth metals or isocyanate compounds, examples of the releasing agent include zinc stearate, calcium stearate, and the like. You can

The thermosetting resin using the peroxide composition of the present invention can be cured by either room temperature curing or heat curing, and the practical curing temperature range is -5 to 5.
180 ° C, preferably 0 to 180 ° C, more preferably 5
C. to 180.degree. Particularly preferably, it is 5 to 40 ° C. in the case of room temperature curing.

[0027]

The present invention will be described in more detail with reference to Reference Examples, Examples and Test Examples, but the present invention is not limited to these Examples.

Reference Example 1 Propylene glycol 1 was placed in a 1 L separable flask equipped with a synthetic stirrer for an ortho unsaturated polyester resin (resin 1), a fractionating condenser, a gas introduction tube, and a thermometer.
61 g, maleic anhydride 196 g, phthalic anhydride 296
g was charged and esterified in a nitrogen gas stream at 180 to 205 ° C. to obtain an unsaturated alkyd resin having an acid value of 36.1. Hydroquinone 0.1g, styrene 385g
Was added to obtain an ortho polyester resin (Resin 1).

Example 1 100 g of TXIB (2,2,4-trimethyl-1,3-pentanediol diisobutyrate) and 72 g of methyl ethyl ketone were placed in a beaker, and 5 g of 50% sulfuric acid was added thereto.
Add. While stirring, 100 g of 60% hydrogen peroxide solution at 20 ° C
In 30 minutes. The reaction is completed by continuing stirring for 60 minutes. After separating into an organic layer and an aqueous layer with a separating funnel and neutralizing the organic layer with calcium carbonate, dehydration was performed using 20 g of anhydrous sodium sulfate and anhydrous magnesium sulfate, and then the dehydrating agent was filtered off to give TXIB. MEKPO included
A composition (the peroxide composition of the present invention) was obtained (MEKPO
Content 55%). Yield of the peroxide composition of the present invention 22
The amount was 0 g and the amount of active oxygen was 10.2%.

Comparative Example 1 A MEKPO composition was prepared under the same conditions as in Example 1, except that TXIB was replaced with dimethyl phthalate.

Test Example 1 Viscosity Measurement The viscosities of the MEKPO composition of the present invention obtained in Example 1 and the MEKPO composition obtained in Comparative Example 1 at each temperature were measured by using E-type viscometer VISCONIC manufactured by Tokyo Keiki. It measured using ELD and a result is shown in Table 1.

Table 1 Measurement temperature and viscosity (m.Pa.s) Measurement temperature 5 ° C. 10 ° C. 20 ° C. 30 ° C. 40 ° C. Example 1 26.6 20.0 12.2 8.6 6.3 Comparative Example 1 60 .4 40.4 21.1 13.4 9.1

Test Example 2 Dispersion Test of Peroxide Composition in Resin A certain amount (20 g) of Resin 1 obtained in Reference Example 1 was dropped on a glass plate in a thermostatic chamber at 10 ° C. And a red colored product of the composition of Example 1 kept at 10 ° C. (red dye concentration is 0.1 part with respect to 100 g of peroxide)
And a red colored product of the composition of Comparative Example 1 (red dye concentration is 0.1 part with respect to 100 g of peroxide) was added dropwise to each different place with a dropper. The diffusion of the curing agent was visually confirmed after 10 minutes, and the results are shown in Table 2.

Table 2 Visually dispersed state at 10 minutes after dropping Example 1 Uniform diffusion with a diameter of about 2.0 cm Comparative Example 1 The diffused area was 1.5 cm, which was smaller than that of Example 1 and diffused. The condition was also mottled.

[0035]

INDUSTRIAL APPLICABILITY The peroxide composition of the present invention can be used as a curing agent for thermosetting resins such as polyester resin, vinyl ester resin and acrylic resin, and can solve the endocrine problem. Compared with the curing agent using dimethyl phthalate, the viscosity increase at low temperature is small, so that the work efficiency at low temperature can be improved in spray-up molding and the viscosity change due to temperature change is small. In addition, since there is little variation in the discharge amount due to temperature changes and the dispersion in the resin is fast, it is possible to improve work efficiency and obtain a product of uniform quality.

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Claims (10)

[Claims] 1. A low-viscosity peroxide composition containing an ester other than phthalates (excluding those having a hydroxy group or an alkoxy group as a substituent in the ester group) as a peroxide diluent. 2. A low-viscosity peroxide composition containing an ester of a polyhydric alcohol having 3 to 12 carbon atoms and an aliphatic carboxylic acid having 2 to 7 carbon atoms as a peroxide diluent. 3. A peroxide composition for thermosetting resin curing, comprising an ester of a polyhydric alcohol having 3 to 12 carbon atoms and an aliphatic carboxylic acid having 2 to 7 carbon atoms as a peroxide diluent. 4. The peroxide composition according to claim 2, wherein the polyhydric alcohol is a hyperbranched diol or triol. 5. The peroxide composition according to any one of claims 2 to 4, wherein the aliphatic carboxylic acid having 2 to 7 carbon atoms is a branched aliphatic carboxylic acid having 3 to 6 carbon atoms. object. 6. A thermosetting resin is an unsaturated polyester resin,
A vinyl ester resin or an acrylic resin.
Item 7. The peroxide composition according to any one of items 5 to 5. 7. The content of ester is 30 based on the total composition.
It is-70 mass%, The peroxide composition as described in any one of Claims 1-6. 8. The peroxide composition according to claim 1, which has a viscosity at 40C of 40 mPa · s or less. 9. The method according to any one of claims 1 to 8, wherein the ester of the polyhydric alcohol and the aliphatic carboxylic acid is 2,2,4-trimethyl-1,3-pentanediol diisobutyrate. The peroxide composition described. 10. A method for curing an unsaturated polyester resin, a vinyl ester resin or an acrylic resin, which comprises using the peroxide composition according to any one of claims 1 to 9.