JPH083252A - Acrylic resin composition to be used as molding material for smc and bmc, molding material, and molded product - Google Patents

Abstract

PURPOSE:To obtain an acrylic resin composition to be used as a molding material for SMC and BMC, which is improved in operability and productivity, doesn't need extra aging, and can be thickened quickly even at room temperature to attain the viscosity at which molding is possible by introducing a long- chain (meth)acrylic acid containing one or more carboxyl groups into the end of an acrylic resin composition. CONSTITUTION:This acrylic resin composition to be used as a molding material for SMC and BMC comprises a (meth)acrylate copolymer (A) and a polymerizable unsaturated monomer (B). The copolymer (A) has a number- average molecular weight of 3,000 to 100,000 and contains as the essential ingredients a (meth)acrylate monomer (A1) and a long-chain (meth)acrylate (A2) having one or more carboxyl groups at the end thereof. Examples of the (meth)acrylate (A2) include those having a number-average molecular weight of 150 to 2,000 and obtained by the ring-opening polymerization of epsilon-caprolactum with (meth)acrylic acid. The ratios of (A1) to (A2) and (A) to (B) are 80-99.5/0.5-20 and 20-80/20-80, respectively, by weight. Molded products are obtained by press molding this composition at 40 to 180 deg.C.

Description

Detailed Description of the Invention

[0001]

The present invention relates to SMC (Sheet Moldin)
Acrylic resin composition for SMC / BMC molding material, acrylic SMC and excellent SMC / BMC molding material that can easily thicken at room temperature during the production of g Compound) / BMC (Bulk Molding Compound) The present invention relates to BMC molding materials and molded products such as vanities, kitchen counters, and wall materials that are excellent in texture, weather resistance and water resistance.

[0002]

2. Description of the Related Art Conventionally, an unsaturated polyester resin has been generally known as a thermosetting resin used in a resin composition for pressurizing and heating. S used for pressure heat molding
A molding material such as MC / BMC is easy to integrally mold, has a particularly excellent design property, has a high molding speed, and can stabilize dimensional accuracy and quality. Further, since it leads to the improvement of the molding work environment which has become a problem in recent years, it has replaced the conventional hand lay-up molding material and spray-up molding material.

Further, as a general method for producing SMC and BMC, there is a method in which an unsaturated polyester resin is mixed with a filler, a reinforcing material, a polymerization initiator, a thickener and the like to form a sheet or a bulk. Are known. At that time, it is necessary to increase the viscosity of the compound after compounding to a viscosity that allows press molding. As the thickening method, a method using an oxide such as magnesium oxide and a urethane thickening method using an isocyanate are well known.

Further, as disclosed in JP-A-57-65711, a method using a composition comprising a metal oxide and an unsaturated epoxy resin, and a chelate of an alkaline earth metal as disclosed in JP-A-62-9605. Is disclosed. In the case of acrylic resin, for example, JP-A-57-3
As shown in 1912, a polyethylene film or the like is wrapped with a compound consisting of a cross-linking acrylic syrup, a thickener such as magnesium oxide, a polymerization initiator, and if necessary, a filler, a release agent, a colorant, and the like. There is disclosed a method of producing a sheet or a bulk which is aged to remove tackiness and has improved moldability.

[0005]

[Problems to be Solved by the Invention] BMC / SMC
The problem in the production of the compound is how to thicken the compound. When urethane thickening is used as a method for thickening unsaturated polyester resins, it is indispensable and difficult to control the viscosity by adjusting the hydroxyl value in the resin.

Further, the thickening by the metal chelate has a drawback that the thickening behavior is difficult to control and the fluidity at the time of molding is greatly affected and is difficult to control. Further, when a metal oxide used in an acrylic resin made of an acrylic monomer is used as a thickener, there is a problem that extra aging is required at 40 ° C. for several days.

According to the present invention, the compound viscosity after compounding hardly requires extra aging and can be easily thickened at room temperature to a moldable state, that is, SMC / BMC molding excellent in thickening property and moldability. It is an object of the present invention to provide an acrylic resin composition for materials, a molding material, and a molded article excellent in weather resistance, water resistance and texture.

[0008]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors to improve such drawbacks, as a result, a long chain having at least one carboxyl group at the end in an acrylic resin composition ( By introducing a (meth) acrylic acid ester, it was found that the viscosity can be increased very quickly to a moldable viscosity even at room temperature without requiring extra aging, and the present invention has been completed.

That is, the present invention comprises (a) a (meth) acrylic acid ester-based monomer and (b) at least 1 at the terminal.
Acrylic resin composition for SMC / BMC molding material, characterized by comprising a long-chain (meth) acrylic acid ester-based copolymer (A) having one or more carboxyl groups and a polymerizable monomer (B) Preferably, the long-chain (meth) acrylic acid ester (b) having at least one or more carboxyl groups at the terminal has a number average molecular weight of 150 to which the lactone is ring-opening polymerized with a (meth) acrylic acid-based monomer. It is a (meth) acrylic acid alkyl ester having a terminal carboxyl group of 2000, and more preferably (1) a terminal carboxyl group having a number average molecular weight of 150 to 2000 obtained by ring-opening polymerization of ε-caprolactone with (meth) acrylic acid. Or (2) hydroxyalkyl ester of (meth) acrylic acid having ε-caprolact (Meth) acrylic acid ester having a terminal carboxyl group having a number average molecular weight of 150 to 2000, which is obtained by adding a polyvalent carboxylic acid to a hydroxyalkyl ester of (meth) acrylic acid obtained by ring-opening polymerization of styrene. The (a) :( b) which is a constituent component of the (meth) acrylic acid ester-based polymer (A) is 80 to 99.5: 0.5 to 20 on a weight basis, and preferably (meth) acrylic acid. The number average molecular weight of the ester-based copolymer (A) is 3,000 to 100,000, the (meth) acrylic acid ester-based copolymer (A) and the polymerizable unsaturated monomer (B) are on a weight basis. 20 ~ 80: 20 ~ 8
0 is an acrylic resin (C), and (a) a (meth) acrylic acid ester monomer, and
(B) A (meth) acrylic acid ester-based copolymer (A) containing a long-chain (meth) acrylic acid ester having at least one carboxyl group at the terminal as an essential component and a polymerizable unsaturated monomer (B Acrylic resin composition consisting of), polyfunctional monomer (C), inorganic filler (D), reinforcing material (E),
SMC / B characterized by comprising a polymerization initiator (F)
It provides MC molding materials and molded products.

(Constitution) As the (meth) acrylic acid ester monomer (a) which is a constituent of the (meth) acrylic acid ester copolymer (A) of the acrylic resin composition used in the present invention. Is, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth)
Acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, phenyl (meth)
Examples thereof include acrylate and lauryl acrylate.

The long chain (meth) acrylic acid ester (b) having at least one carboxyl group at the terminal is preferably a number obtained by ring-opening polymerization of a lactone with a (meth) acrylic acid type monomer. Average molecular weight is 150 ~
It is a (meth) acrylic acid alkyl ester having a terminal carboxyl group of 2000, and more preferably (1) a terminal carboxyl group having a number average molecular weight of 150 to 2000 obtained by ring-opening polymerization of ε-caprolactone with (meth) acrylic acid. (Meth) acrylic acid ester having (1) or (2) hydroxyalkyl ester of (meth) acrylic acid was subjected to ring-opening polymerization of ε-caprolactone (meth)
Number average molecular weight 150 to 2000 obtained by condensation reaction of hydroxyalkyl ester of acrylic acid with polyvalent carboxylic acid
Is a (meth) acrylic acid ester having a terminal carboxyl group. Among these commercially available products, for example, “Aronix M5300” manufactured by Toagosei Kagaku Co., Ltd. is particularly representative.

In the case of (2), the hydroxyalkyl ester of (meth) acrylic acid is, for example, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth).
Examples thereof include acrylate and 1,4-butylene glycol mono (meth) acrylate. The polycarboxylic acid is, for example, phthalic anhydride, isophthalic acid, terephthalic acid, adipic acid, sebacic acid, succinic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, tetrahydrophthalic acid, (anhydrous). Examples thereof include trimellitic acid and (anhydrous) pyromellitic acid.

The (meth) acrylic acid ester-based copolymer (A) composed of these constituent components (a) and (b) is preferably (a) :( b) = 80-99.5: by weight.
0.5 to 20 (% by weight), more preferably 90 to 99:
It is composed of 1.0 to 10 (% by weight). When the amount of (b) used is less than 0.5% by weight, the thickening rate becomes extremely slow, which causes a problem in workability. On the other hand, when it exceeds 20% by weight, the thickening rate becomes fast and the final viscosity is also increased. This is not preferable because it becomes high and the fluidity in the mold at the time of press molding is lost.

The acrylic resin raw materials (a) and (b) as described above constitute a (meth) acrylic acid ester-based copolymer (A), which is generally used in bulk polymerization, suspension polymerization and the like. It is obtained by a polymerization method. The number average molecular weight is preferably 3,000 to 100,000. More preferably, it has a number average molecular weight of 5,000 to 50,000. If it is less than 3,000, the viscosity of the acrylic syrup is too low, so the initial viscosity is lowered and the workability is deteriorated.
If it exceeds 000, the initial viscosity is high and it becomes difficult to knead SMC / BMC.

In the case of bulk polymerization, the (meth) acrylic acid ester type monomer (a) can be used as a substitute for the polymerizable unsaturated monomer (B). However, in the case of suspension polymerization, it is necessary to wash and dry the obtained pearly acrylic resin and then dissolve it in the polymerizable unsaturated monomer (B).

As the polymerizable unsaturated monomer (B),
For example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, lauryl One or more kinds of (meth) selected from (meth) acrylic acid esters such as (meth) acrylate
Other polymerizable monomer which is an acrylic ester and is copolymerizable with the above (meth) acrylic ester, if necessary,
For example, styrene, α-methylstyrene, methacrylic acid amide, maleic acid ester having an alkyl group having 1 to 4 carbon atoms, fumaric acid ester and the like may be used in combination.

Further, the (meth) acrylic acid ester-based copolymer (A) and the polymerizable unsaturated monomer (B) are preferably 20 to 80:20 to 80, more preferably 30 to 80 by weight. Acrylic syrup can be obtained by dissolving it so as to consist of 70:30 to 70 (wt%). That is, if the content of (B) is less than 20% by weight, the viscosity of the syrup becomes high, making it difficult to knead when blending SM / BMC, and if it exceeds 80% by weight, the syrup viscosity decreases and the initial thickening becomes extremely slow. Workability is reduced.

The polyfunctional monomer (C) that can be used in the present invention is preferably a monomer having at least two (meth) acryloyl groups in the molecule, for example, 1,3
-Propyl glycol dimethacrylate, 1,4-butylene glycol dimethacrylate (BG), 1,6-hexanediol dimethacrylate (HD), 1,3-butylene glycol dimethacrylate, dimethylolethane dimethacrylate, 1,1-di Methylolpropane dimethacrylate, 2,2-dimethylolpropane dimethacrylate, trimethylolethane trimethacrylate, trimethylolethane triacrylate (TME
T), trimethylolpropane triacrylate (A-
TMPT), trimethylolpropane trimethacrylate (TMPT) and the like.

The polyfunctional monomer (C) is the same as the (A).
The acrylic resin composition (also referred to as acrylic syrup) composed of (B) is preferably blended in an amount of 1 to 20% by weight, more preferably 3 to 15% by weight, and subjected to partial crosslinking polymerization. That is, if it is less than 1% by weight, the strength is not so effective, while if it exceeds 20% by weight, the crosslinking proceeds and becomes brittle, and the physical properties are deteriorated.

Further, in the present invention, in order to further enhance the strength of the molded product, it is preferable to add an inorganic filler (D). The inorganic filler (D) is not particularly limited, but examples thereof include calcium carbonate, clay, alumina powder, silica powder, talc, barium sulfate, silica powder, glass powder, glass beads, mica, and magnesium silicate. , Cristopalite, aluminum hydroxide, quartz powder, fused silica powder, aluminum silicate, silica sand, cold water stone, marble scrap,
Examples include crushed stones, which are used alone or in combination.

Among them, aluminum hydroxide, glass powder, etc., which give depth and semi-transparency upon curing, are preferable. The amount of addition is 15 parts with respect to 100 parts by weight of acrylic syrup.
0 to 350 parts by weight is preferable. As the above-mentioned aluminum hydroxide used as a filler, for example, "Hijilite H-100, H-3" manufactured by Showa Denko KK
10 or H-320 ";or" BW-153 "manufactured by Nippon Light Metal Co., Ltd. and the like are particularly representative, and the particle size thereof is not particularly limited, but is within a range of 1 to 300 μm. Appropriate. In addition, as the thickener among the inorganic fillers, oxides or hydroxides of alkaline earth metals such as magnesium oxide and calcium hydroxide are preferable.

Examples of the reinforcing material (E) are glass fiber, aramid fiber, vinylon fiber, polyester fiber,
Examples include polyimide fibers, carbon fibers, asbestos, potassium titanate, whiskers, metal fibers and the like. The fiber length of these reinforcing materials (E) is preferably 2 to 50 mm. The addition amount is 1 of acrylic syrup
It is preferably 1 to 20 parts by weight, more preferably 5 to 15 parts by weight with respect to 00 parts by weight. That is, 1
If it is less than 30 parts by weight, the strength is not effective, and if it exceeds 30 parts by weight, the strength remains unchanged.

Examples of the polymerization initiator (F) include dicumyl peroxide, 1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane, 1,
1-di-t-butylperoxycyclohexane, t-butylperoxybenzoate, t-butylperoxyacetate or t-amylperoxyoctoate, t
-Amylperoxy-2-ethylhexanoate, t-
Various peroxides such as butylperoxy-2-ethylhexanoate may be mentioned, and it goes without saying that these may be used alone or in combination of two or more kinds. The amount of the polymerization initiator (G) used is preferably 0.5 to 3.0 parts by weight per 100 parts by weight of acrylic syrup.

The acrylic molding material of the present invention comprises the above-mentioned (a) (meth) acrylic acid ester-based monomer and
(B) From a (meth) acrylic acid ester-based copolymer (A) and a polymerizable monomer (B) that have a long-chain (meth) acrylic acid ester having at least one carboxyl group at the terminal as an essential component It is easy to knead the following acrylic resin composition (acrylic syrup) as an essential component, and knead the polyfunctional monomer (C), the inorganic filler (D), the reinforcing material (E), and the polymerization initiator (F). Can be obtained.

In addition, if necessary, other various release agents such as zinc stearate and calcium stearate, colorants, various coupling agents, anti-agglomeration agents, polymerization inhibitors, lubricants, low-shrinking agents, etc. Additives can be used.

The kneading can be carried out at room temperature or under heating at a temperature lower than the curing temperature by using a kneading machine which is usually used, for example, a kneader, a mixer, a roll mixer, a screw extruder or the like. In addition, a method of wrapping the obtained kneaded product in a film in which (meth) acrylic acid esters do not permeate, arranging it in a bulk or sheet shape, and aging at room temperature and using it as an SMC / BMC molding material is adopted. To be In this case, the kneaded product is allowed to stand for several hours at a room temperature of 5 to 40 ° C. to form a non-adhesive lump (BMC) or sheet (SMC) -like molding material.

As a method for producing a molded article, the non-adhesive molding material (BMC or SMC) is preferably used.
To 180 ° C., more preferably 100 to 130
Put in a mold (mold etc.) heated to a temperature in the range of ℃,
Under pressure of 10 to 200 kg / cm ² , the molded product can be taken out after being press-molded for about 1 to 60 minutes. In addition, these molding conditions can be appropriately selected according to the difference in conditions such as the composition content of the molding material, the shape of the molded product, and the size.

[0028]

EXAMPLES Next, the present invention will be explained more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

In the following, "part" and "%"
All are by weight unless otherwise noted.

Example 1 In a 5 liter separable flask equipped with a stirrer, a thermometer and a reflux condenser, 2500 g of ion exchanged water, 0.204 g of NaNO ₂ and polyacrylic acid (dispersant, manufactured by Nippon Pure Chemical Co., Ltd. AC-1
OH ") 6.00 g and stirred, and in a nitrogen stream 60
Heat to ℃. To this, methyl metal relate 109
2 g, ω-carboxy-polycaprolactone monoacrylate (manufactured by Toagosei Kagaku [Aronix M5300,
Molecular weight 312] 108.0 g, a mixed solution of β-mercaptopropionic acid 12.0 g as a chain transfer agent and lauryl peroxide (manufactured by Kayaku Akzo) 12.0 g as a polymerization initiator is added. The stirring speed is 200 rpm and the temperature is kept at 80 ° C. After 3 hours, after confirming that the specific gravity became 1.13 or more, the mixture was heated and stirred for another 3 hours. During the reaction, inconvenience such as blocking did not occur. 200 after cooling
Filter with a mesh filter cloth, wash with distilled water and dry (40 ℃,
After vacuum drying for 10 hours at 40 ° C. for 24 hours), a transparent pearl-like polymer was obtained. As a result of measuring the molecular weight by GPC, the number average molecular weight was 21,000.

Next, a sufficiently dried (meth) acrylic acid ester polymer (A-1) 100 was placed in a 5 liter separable flask equipped with a stirrer, a thermometer and a reflux condenser.
0 g, 1500 g of methyl methacrylate (B) and 100 ppm of hydroquinone as a polymerization inhibitor are added, stirred and heated to 40 ° C. The acrylic resin composition (A-1) was obtained by completely stirring and stirring for about 4 hours.

(Example 2) 130 parts of 2-hydroxyethyl methacrylate and ε-caprolactone 741 were placed in a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser.
Parts, 0.4 parts of hydroquinone monomethyl ether as a polymerization inhibitor, and 0.004 parts of stannous chloride as a catalyst were added, and the reaction was carried out at 120 ° C. for 20 hours. Reaction rate is 99.5
%, Hue was 1 (Gardner), and caprolactone-modified hydroxymethyl ester of acrylic acid having an average molecular weight of 1000 was obtained. Trimellitic anhydride 1 to this ester
92 parts was added and the condensation reaction was further carried out at 120 ° C. for 10 hours. The acid value of the obtained paste-like ester is 20, and G
The number average molecular weight by PC was 20,000.

Next, an acrylic resin composition (A-2) was obtained in the same manner as in Example 1 except that 24 g of this ester and 1176 g of methyl methacrylate were used.

Comparative Example 1 An acrylic resin composition (A-3) was obtained in the same manner as in Example 1 except that methacrylic acid (MAA) was used instead of Aronix M5300 used in Example 1. It was

Example 3 With respect to 95 parts of the acrylic resin composition (A-1) obtained in Example 1, 5 parts of trimethylolpropane triacrylate, and Trigonox 121-50 (chemical agent Akzo as a polymerization initiator) were used. Manufactured t-amyl peroxy-2-ethylhexanoate 50% solution) 2
Parts, and 250 parts of aluminum hydroxide (Higelite H-100 / H-310 = 3/2 manufactured by Showa Denko KK) were mixed and kneaded for 10 minutes using a planetary mixer (manufactured by Inoue Manufacturing Co., Ltd.). After that, 1.5 parts of magnesium oxide and 5 parts of glass fibers having a cut length of 3 mm were further added as a thickener, and kneading was performed for 5 minutes. Next, add this kneaded mixture to 2
Leave for 5 hours at 5 ° C, rubber clay-like non-sticky BM
C molding material was obtained.

Then, 850 g of this BMC is added to 300 ×
Put in a mold of size 300 × 8 (mm),
Press molding was performed under conditions of a temperature of 115 ° C., a pressure of 100 kg / cm ² , and a pressing time of 5 minutes, and 300 × 300 × 5 (m
A flat plate of m) was obtained. The surface texture was evaluated using this molded plate.

Further, this molded plate was subjected to an accelerated weather resistance test for 1000 hours with a sunshine weatherometer,
The surface gloss and deterioration of the molded plate were visually measured for changes. In addition, a boiling test at 90 ° C
The state of the molded plate was visually measured for 00 hours. The evaluation results are shown in Table 1.

Example 4 To 90 parts of the acrylic resin composition (A-1) obtained in Example 1, 10 parts of trimethylolpropane triacrylate, 2 parts of Trigonox 121-50 as a polymerization initiator, Aluminum hydroxide (Heidilite H-310 / H-320 = 2/1) 1
Add 20 parts and use a planetary mixer to 1
After kneading for 0 minutes, 1.5 parts of magnesium oxide was further added as a thickener and kneading was performed for 5 minutes. A part of it is spread on a polyethylene film with a roll of 100 × 50 (cm), and 28.6 g of glass fiber cut into 25 mm is evenly sprinkled on the polyethylene film, folded in two, stacked and impregnated with a roll for defoaming. A glass sheet having a glass content of 13% and a thickness of about 2 mm was left at 25 ° C. for 10 hours to obtain an acrylic sheet-like molding material (SMC) without stickiness.

Next, this SMC molding material was cut into an appropriate size, and 540 g was put into a mold of size 300 × 300 × 8 (mm), and the temperature was 115 ° C. and the pressure was 1
Press molding was performed under the conditions of 00 kg / cm ² and a pressing time of 5 minutes to obtain a 300 × 300 × 3 (mm) flat plate. The surface texture was evaluated using this molded plate. Further, this molded plate was subjected to an accelerated weathering test for 1000 hours with a sunshine weatherometer, and the changes in surface gloss and deterioration state of the molded plate were visually measured. Further, as a water resistance evaluation, a boiling test was performed at 90 ° C. for 100 hours, and the state of the molded plate was visually measured. The evaluation results are shown in Table 1.

(Example 5) The procedure of Example 4 was repeated except that the acrylic resin composition (A-2) obtained in Example 2 was used. The results of evaluation of the obtained molded products are shown in Table 1.

Example 6 The procedure of Example 5 was repeated except that the acrylic resin composition (A-2) obtained in Example 2 was used. The results of evaluation of the obtained molded products are shown in Table 1.

Comparative Example 2 The formulation of Example 4 was used except that the acrylic resin composition (A-3) obtained in Comparative Example 1 was used. The obtained kneaded product was aged at 25 ° C. for 5 days to obtain BMC. The results of evaluation of the press-formed product are shown in Table 1.

Comparative Example 3 The composition of Example 5 was used except that the acrylic resin composition (A-3) obtained in Comparative Example 1 was used. The obtained kneaded product was allowed to stand for aging at 25 ° C. for 5 days, but the thickening was slow and there was stickiness, and a sheet-like molding material (SMC) could not be obtained.

[0044]

[Table 1]

[0045]

INDUSTRIAL APPLICABILITY The present invention introduces a long-chain (meth) acrylic acid ester having at least one carboxyl group at the terminal into an acrylic resin composition, thereby eliminating the need for extra aging. Acrylic resin composition for molding materials with excellent viscosity increase, workability, and productivity that can increase viscosity to moldability at room temperature very quickly, and acrylic SMC / BMC molding using it, which has excellent moldability material,
Also, since it is possible to provide an acrylic resin molded product having excellent weather resistance, texture, and water resistance, it is useful as a housing facility / building member such as a bathtub, vanity, kitchen counter, and wall material.

Claims (8)

[Claims] 1. A (meth) acrylic acid ester-based monomer (a) and a long-chain (meth) acrylic acid ester having at least one carboxyl group at the terminal (b) are essential components (meth). An acrylic resin composition for an SMC / BMC molding material, comprising an acrylic ester copolymer (A) and a polymerizable unsaturated monomer (B). 2. A long-chain (meth) acrylic acid ester (b) having at least one carboxyl group at the terminal.
Is a (meth) acrylic acid alkyl ester having a terminal carboxyl group having a number average molecular weight of 150 to 2000 obtained by ring-opening polymerization of a lactone with a (meth) acrylic acid-based monomer. Acrylic resin composition for SMC / BMC molding. 3. A long-chain (meth) acrylic acid ester (b) having at least one carboxyl group at the terminal.
Is (1) (meth) acrylic acid, which is obtained by ring-opening polymerization of ε-caprolactone with (meth) acrylic acid alkyl ester having a terminal carboxyl group having a number average molecular weight of 150 to 2000, or (2) (meth) acrylic acid. Number-average molecular weight of the hydroxyalkyl ester of (meth) acrylic acid obtained by ring-opening polymerization of ε-caprolactone with a polyvalent carboxylic acid of 150 to 20
The SMC according to claim 1, which is a (meth) acrylic acid ester having a terminal carboxyl group of 00.
-Acrylic resin composition for BMC molding. 4. The (meth) acrylic acid ester polymer (A), which is a constituent component (a) :( b), is 80 to 99.5: 0.5 to 20 on a weight basis. The acrylic resin composition for an SMC / BMC molding material according to claim 1. 5. The acrylic resin composition for an SMC / BMC molding material according to claim 1, wherein the (meth) acrylic acid ester-based copolymer (A) has a number average molecular weight of 3,000 to 100,000. . 6. The (meth) acrylic acid ester-based copolymer (A) and the polymerizable unsaturated monomer (B) are contained in an amount of 2 by weight.
It is an acrylic resin (C) which consists of 0-80: 20-80, The acrylic resin composition for SMC / BMC molding materials of Claim 1 characterized by the above-mentioned. 7. An (meth) acrylic acid ester-based monomer (a) and a long chain (meth) acrylic acid ester having at least one carboxyl group at the terminal (b) are essential components (meth). An acrylic resin composition comprising an acrylic ester copolymer (A) and a polymerizable unsaturated monomer (B), a polyfunctional monomer (C), an inorganic filler (D),
A SMC / BMC molding material comprising a reinforcing material (E) and a polymerization initiator (F). 8. A molded article comprising the acrylic resin composition for an SMC / BMC molding material according to claim 1.