JP6166147B2 - Resin composition and method for producing the same - Google Patents

Description

  The present invention relates to a resin composition containing an acrylic resin and a polycarbonate resin, a method for producing the same, and a molded body obtained from the resin composition.

  In general, it is known that acrylic resins such as polymethyl methacrylate are excellent in transparency but not necessarily satisfactory in terms of heat resistance. On the other hand, polycarbonate resins are known to have excellent heat resistance.

  Therefore, studies have been made to improve heat resistance by blending an acrylic resin with a polycarbonate resin. For example, a blend of syndiotactic polymethyl methacrylate and polycarbonate in which at least 50% of all methyl methacrylate units are in a syndiotactic configuration is known (see Patent Document 1). However, this blend is not necessarily sufficiently transparent.

  Also known is a blend obtained by melt-kneading a resin mixture composed of 3 to 40% by weight of polymethyl methacrylate and 60 to 97% by weight of polycarbonate using a trace type high shear molding machine (Patent Document 2). reference). However, this blend is not necessarily sufficiently transparent.

JP-A-6-128475 JP 2009-196196 A

  The blend of acrylic resin and polycarbonate resin described above may not have good transparency, and there is room for improvement to use as a raw material for optical members such as light guide plates that require excellent transparency. is there.

  An object of the present invention is to provide a resin composition containing an acrylic resin and a polycarbonate resin, which is excellent in transparency.

（式中、Ｒ^１は水素原子またはメチル基を表し、Ｒ^２はシクロアルキル基で置換されたアルキル基、シクロアルキル基、アルキル基で置換されたシクロアルキル基、フェニル基で置換されたアルキル基、フェニル基、アルキル基で置換されたフェニル基、ナフチル基で置換されたアルキル基、ナフチル基、アルキル基で置換されたナフチル基、ジシクロペンタニル基またはジシクロペンテニル基を表す）
で示される（メタ）アクリル酸エステル５〜５０重量％、およびこれら以外の単官能単量体０．１〜２０重量％からなる単量体成分が重合してなる共重合体を含有し、
ポリカーボネート系樹脂が、温度３００℃、荷重１．２ｋｇで測定されるメルトボリュームフローレイトが５０〜１６０ｃｍ^３／１０ｍｉｎであり、
アクリル系樹脂とポリカーボネート系樹脂の合計量を１００重量部とするとき、アクリル系樹脂の含有割合が５０〜９５重量部、ポリカーボネート系樹脂の含有割合が５〜５０重量部である樹脂組成物。
（２）前記式（Ｉ）で示される（メタ）アクリル酸エステルがメタクリル酸シクロヘキシル、メタクリル酸フェニル、メタクリル酸ナフチル、メタクリル酸ジシクロペンタニルおよびメタクリル酸ジシクロペンテニルからなる群より選ばれる少なくとも1種である前記（１）に記載の樹脂組成物。
（３）前記単官能単量体が、アクリル酸メチル、アクリル酸エチル、アクリル酸ｎ−プロピル、アクリル酸イソプロピル、アクリル酸ｎ−ブチル、アクリル酸ｔ−ブチル、アクリル酸ｓｅｃ−ブチル、アクリル酸イソブチルおよびアクリル酸２−エチルヘキシルからなる群より選ばれる少なくとも1種である前記（１）または（２）に記載の樹脂組成物。
（４）アクリル系樹脂の重量平均分子量が、７００００〜３０００００である前記（１）〜（３）のいずれかに記載の樹脂組成物。
（５）前記（１）〜（４）のいずれかに記載の樹脂組成物を製造する方法であって、
アクリル系樹脂とポリカーボネート系樹脂とを含む樹脂混合物を、１８０〜３２０℃の温度にて、１０〜３００ｓｅｃ^-1の剪断速度で溶融混練する工程、
を含む樹脂組成物の製造方法。
（６）前記（１）〜（４）のいずれかに記載の樹脂組成物を成形して得られる成形体。
（７）前記（１）〜（４）のいずれかに記載の樹脂組成物を成形して得られる導光板。 As a result of intensive studies to achieve the above-mentioned problems, the present inventors have completed the present invention. That is, this invention consists of the following structures.
(1) A resin composition comprising an acrylic resin and a polycarbonate resin,
Acrylic resin is methyl methacrylate 50-95% by weight, the following formula (I)

Wherein R ¹ represents a hydrogen atom or a methyl group, and R ² represents an alkyl group substituted with a cycloalkyl group, a cycloalkyl group, a cycloalkyl group substituted with an alkyl group, or an alkyl group substituted with a phenyl group. , Phenyl group, phenyl group substituted by alkyl group, alkyl group substituted by naphthyl group, naphthyl group, naphthyl group substituted by alkyl group, dicyclopentanyl group or dicyclopentenyl group)
Containing a copolymer obtained by polymerizing a monomer component consisting of 5 to 50% by weight of (meth) acrylic acid ester and 0.1 to 20% by weight of a monofunctional monomer other than these,
Polycarbonate-based resin, temperature of 300 ° C., a melt volume flow rate measured under a load 1.2kg is 50~160cm ³ / 10min,
A resin composition in which the acrylic resin content is 50 to 95 parts by weight and the polycarbonate resin content is 5 to 50 parts by weight when the total amount of the acrylic resin and the polycarbonate resin is 100 parts by weight.
(2) The (meth) acrylic acid ester represented by the formula (I) is at least 1 selected from the group consisting of cyclohexyl methacrylate, phenyl methacrylate, naphthyl methacrylate, dicyclopentanyl methacrylate and dicyclopentenyl methacrylate. The resin composition according to (1), which is a seed.
(3) The monofunctional monomer is methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, t-butyl acrylate, sec-butyl acrylate, or isobutyl acrylate. And the resin composition according to (1) or (2), which is at least one selected from the group consisting of 2-ethylhexyl acrylate.
(4) The resin composition according to any one of (1) to (3), wherein the acrylic resin has a weight average molecular weight of 70,000 to 300,000.
(5) A method for producing the resin composition according to any one of (1) to (4),
A step of melt kneading a resin mixture containing an acrylic resin and a polycarbonate resin at a shear rate of 10 to 300 sec ⁻¹ at a temperature of 180 to 320 ° C .;
The manufacturing method of the resin composition containing this.
(6) A molded product obtained by molding the resin composition according to any one of (1) to (4).
(7) A light guide plate obtained by molding the resin composition according to any one of (1) to (4).

  According to the present invention, a resin composition containing an acrylic resin and a polycarbonate resin that is excellent in transparency can be obtained.

  By molding the resin composition of the present invention, a molded product having excellent transparency can be obtained. Since a molded article having excellent transparency is obtained, the resin composition can be suitably used as a raw material for optical members, particularly light guide plates.

（式中、Ｒ^１は水素原子またはメチル基を表し、Ｒ^２はシクロアルキル基で置換されたアルキル基、シクロアルキル基、アルキル基で置換されたシクロアルキル基、フェニル基で置換されたアルキル基、フェニル基、アルキル基で置換されたフェニル基、ナフチル基で置換されたアルキル基、ナフチル基、アルキル基で置換されたナフチル基、ジシクロペンタニル基またはジシクロペンテニル基を表す）
で示される（メタ）アクリル酸エステル５〜５０重量％、およびこれら以外の単官能単量体０．１〜２０重量％からなる単量体成分が重合してなる共重合体を含有するアクリル系樹脂と、メルトボリュームフローレイト（ＭＶＲ）が所定の範囲であるポリカーボネート系樹脂とを、所定の含有割合で含む。 The resin composition of the present invention comprises 50 to 95% by weight of methyl methacrylate, the following formula (I)

Wherein R ¹ represents a hydrogen atom or a methyl group, and R ² represents an alkyl group substituted with a cycloalkyl group, a cycloalkyl group, a cycloalkyl group substituted with an alkyl group, or an alkyl group substituted with a phenyl group. , Phenyl group, phenyl group substituted by alkyl group, alkyl group substituted by naphthyl group, naphthyl group, naphthyl group substituted by alkyl group, dicyclopentanyl group or dicyclopentenyl group)
(Meth) acrylic acid ester represented by 5 to 50% by weight, and other acrylic monomers containing a copolymer obtained by polymerizing a monomer component consisting of 0.1 to 20% by weight of other monofunctional monomers A resin and a polycarbonate-based resin having a melt volume flow rate (MVR) in a predetermined range are included at a predetermined content ratio.

<Acrylic resin>
The acrylic resin is methyl methacrylate 50 to 95% by weight, (meth) acrylic acid ester represented by the above formula (I) (hereinafter sometimes referred to as (meth) acrylic acid ester (I)) 5 to 50. Containing a copolymer obtained by polymerizing a monomer component consisting of 0.1% to 20% by weight and other monofunctional monomers (hereinafter sometimes referred to as monofunctional monomers). To do.

R ² in the formula (I) of the (meth) acrylic acid ester (I) is substituted with an alkyl group substituted with a cycloalkyl group, a cycloalkyl group, a cycloalkyl group substituted with an alkyl group, or a phenyl group. Represents an alkyl group, a phenyl group, a phenyl group substituted with an alkyl group, an alkyl group substituted with a naphthyl group, a naphthyl group, a naphthyl group substituted with an alkyl group, a dicyclopentanyl group or a dicyclopentenyl group; , A cycloalkyl group, a phenyl group, a naphthyl group, a dicyclopentanyl group, and a dicyclopentenyl group are preferable. As the cycloalkyl group in R ^2, a cycloalkyl group having 5 to 12 carbon atoms is preferable, and examples thereof include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclododecyl group, and the like. Among them, a cyclohexyl group Is preferred. As the (meth) acrylic acid ester (I), cyclohexyl methacrylate, phenyl methacrylate, naphthyl methacrylate, dicyclopentanyl methacrylate and dicyclopentenyl methacrylate are preferable, and cyclohexyl methacrylate and phenyl methacrylate are more preferable. . The (meth) acrylic acid ester (I) may be used alone or in combination of two or more. In the present specification, the term “(meth) acryl” means “acryl” or “methacryl”.

The “alkyl group” of the “alkyl group substituted with a cycloalkyl group” represented by R ² is preferably an alkyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group. , N-butyl group, isobutyl group, tert-butyl group and the like, and the “cycloalkyl group” as the substituent is preferably a cycloalkyl group having 5 to 12 carbon atoms, such as a cyclopentyl group, a cyclohexyl group, A cycloheptyl group, a cyclooctyl group, a cyclododecyl group, etc. are mentioned. In addition, there is no restriction | limiting in particular in the number of the "cycloalkyl group" which is a substituent, and the substitution position in an alkyl group. Examples of the “alkyl group substituted with a cycloalkyl group” represented by R ² include, for example, a methyl group or an ethyl group in which at least one hydrogen atom (H) is substituted with the above cycloalkyl group having 5 to 12 carbon atoms. , N-propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group and the like.

The “cycloalkyl group” represented by R ² is preferably a cycloalkyl group having 5 to 12 carbon atoms, and examples thereof include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and a cyclododecyl group. Further, it may be further substituted with a substituent such as a hydroxyl group, an amino group, or a sulfone group, if necessary.

As the “cycloalkyl group” of the “cycloalkyl group substituted with an alkyl group” represented by R ² , a cycloalkyl group having 5 to 12 carbon atoms is preferable, for example, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclo An octyl group, a cyclododecyl group, etc. are mentioned. As the “alkyl group” as the substituent, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group Etc. There are no particular restrictions on the number of “alkyl groups” that are substituents and the position of substitution in the cycloalkyl group. Examples of the “cycloalkyl group substituted with an alkyl group” represented by R ² include, for example, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group in which at least one hydrogen atom (H) is substituted with the above alkyl group. Group, cyclododecyl group and the like.

The “alkyl group” of the “alkyl group substituted with a phenyl group” represented by R ² is preferably an alkyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, Examples thereof include an n-butyl group, an isobutyl group, and a tert-butyl group. In addition, there is no restriction | limiting in particular in the number of the "phenyl group" which is a substituent, and the substitution position in an alkyl group. Examples of the “alkyl group substituted with a phenyl group” represented by R ² include, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n group in which at least one hydrogen atom (H) is substituted with a phenyl group. -A butyl group, an isobutyl group, a tert-butyl group etc. are mentioned (for example, a benzyl group, a phenethyl group, etc.).

The “phenyl group” represented by R ² is not particularly limited, and may be further substituted with a substituent such as a hydroxyl group, an amino group, or a sulfone group.

The “alkyl group” which is a substituent of the phenyl group of the “phenyl group substituted with an alkyl group” represented by R ² is preferably an alkyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, n -Propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group and the like. There are no particular restrictions on the number of “alkyl groups” that are substituents and the position of substitution in the phenyl group. Examples of the “phenyl group substituted with an alkyl group” represented by R ² include an o-tolyl group, an m-tolyl group, and a p-p-tolyl group.

As the “alkyl group” of the “alkyl group substituted with a naphthyl group” represented by R ² , an alkyl group having 1 to 4 carbon atoms is preferable, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, Examples thereof include an n-butyl group, an isobutyl group, and a tert-butyl group. There are no particular restrictions on the number of “naphthyl groups” that are substituent groups and the substitution positions in the alkyl groups. Examples of the “alkyl group substituted with a naphthyl group” represented by R ² include, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n group in which at least one hydrogen atom (H) is substituted with a naphthyl group. -Butyl group, isobutyl group, tert-butyl group and the like can be mentioned (for example, 1-naphthylmethyl group, 2-naphthylmethyl group, 1-naphthylethyl group, 2-naphthylethyl group, etc.).

The “naphthyl group” represented by R ² is not particularly limited, and may be further substituted with a substituent such as a hydroxyl group, an amino group, or a sulfone group.

The “alkyl group” which is a substituent of the naphthyl group of the “naphthyl group substituted with an alkyl group” represented by R ² is preferably an alkyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, n -Propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group and the like. In addition, there is no restriction | limiting in particular in the number of the "alkyl group" which is a substituent, and the substitution position in a naphthyl group. Examples of the “naphthyl group substituted with an alkyl group” represented by R ² include a methylnaphthyl group and an ethylnaphthyl group.

Further, the “dicyclopentanyl group” and “dicyclopentenyl group” represented by R ² may be substituted with an alkyl group, a hydroxyl group, an amino group, a sulfone group, or the like. In addition, as the “alkyl group” as a substituent, an alkyl group having 1 to 4 carbon atoms is preferable. For example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert- A butyl group etc. are mentioned. The number of substituents and the position of substitution in the “dicyclopentanyl group” and “dicyclopentenyl group” are not particularly limited.

In the present invention, R ² is not limited to the above as long as it gives an alicyclic hydrocarbon and / or an aromatic hydrocarbon group to the acrylic resin.

R ² is preferably a cycloalkyl group (preferably a cyclohexyl group), a phenyl group, a naphthyl group, a dicyclopentanyl group, and a dicyclopentenyl group, and more preferably a cyclohexyl group and a phenyl group.

In the present invention, the (meth) acrylic acid ester of the formula (1) is preferably cyclohexyl acrylate (R ¹ = hydrogen atom, R ² = cyclohexyl group), cyclohexyl methacrylate (R ¹ = methyl group, R ² = Cyclohexyl group), phenyl acrylate (R ¹ = hydrogen atom, R ² = phenyl group), phenyl methacrylate (R ¹ = methyl group, R ² = phenyl group), naphthyl acrylate (R ¹ = hydrogen atom, R ² = Naphthyl methacrylate), naphthyl methacrylate (R ¹ = methyl group, R ² = naphthyl group), dicyclopentanyl acrylate (R ¹ = hydrogen atom, R ² = dicyclopentanyl group), dicyclopentamethacrylate alkylsulfonyl ^{(R 1} = methyl, ^{R 2} = dicyclopentanyl group), acrylic acid dicyclopentenyl ^{(R 1} = hydrogen, ^{R 2} Dicyclopentenyl group), methacrylic acid dicyclopentenyl ^{(R 1} = methyl group, an ^{R 2} = dicyclopentenyl group), preferably, cyclohexyl acrylate ^{(R 1} = hydrogen, ^{R 2} = cyclohexyl), methacrylic Acid cyclohexyl (R ¹ = methyl group, R ² = cyclohexyl group), phenyl acrylate (R ¹ = hydrogen atom, R ² = phenyl group), phenyl methacrylate (R ¹ = methyl group, R ² = phenyl group) And more preferably cyclohexyl methacrylate (R ¹ = methyl group, R ² = cyclohexyl group) and phenyl methacrylate (R ¹ = methyl group, R ² = phenyl group).

  Examples of the monofunctional monomer include alkyl methacrylates, alkyl acrylates, vinylcyan compounds other than methyl methacrylate and (meth) acrylic acid ester (I), and a combination of two or more of these. May be used. Of these, alkyl methacrylates and alkyl acrylates other than methyl methacrylate and (meth) acrylic acid ester (I) are preferable. The alkyl methacrylate other than methyl methacrylate is preferably an alkyl methacrylate having an alkyl group having 2 to 4 carbon atoms, such as ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, methacrylic acid. Examples thereof include tert-butyl acid, sec-butyl methacrylate, and isobutyl methacrylate. Alkyl methacrylates other than methyl methacrylate may be used alone or in combination of two or more. Examples of the alkyl acrylate include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, tert-butyl acrylate, sec-butyl acrylate, isobutyl acrylate, and acrylic acid. Examples thereof include 2-ethylhexyl, and among them, methyl acrylate is preferable. The alkyl acrylates may be used alone or in combination of two or more. Examples of the vinylcyan compound include acrylonitrile and methacrylonitrile. A vinylcyan compound may be used individually, respectively, and may be used in combination of 2 or more type.

  The content ratio of methyl methacrylate in the monomer component is usually 50 to 95% by weight, preferably 60 to 90% by weight, and preferably 70 to 85% in that the transparency and weather resistance of the acrylic resin are improved. Weight percent is more preferred. The content ratio of (meth) acrylic acid ester (I) in the monomer component is usually 5 to 50% by weight, preferably 10 to 40% by weight, and more preferably 15 to 30% by weight. When the content ratio of the (meth) acrylic acid ester (I) in the monomer component is less than 5% by weight, the compatibility of the acrylic resin with the polycarbonate resin decreases, and the resin composition and the molded product thereof If the transparency is low and it exceeds 50% by weight, the compatibility of the acrylic resin with the polycarbonate resin is lowered, and the transparency of the resin composition and the molded product thereof is lowered. The content ratio of the monofunctional monomer in the monomer component is usually 0.1 to 20% by weight, preferably 0.1 to 10% by weight, and more preferably 0.1 to 5% by weight. When the content ratio of the functional monomer in the monomer component is less than 0.1% by weight, the thermal stability of the acrylic resin at a high temperature is lowered, and the resin composition and its molded body are easily thermally decomposed. When the amount exceeds 20% by weight, the resulting acrylic resin has low heat resistance.

  There is no restriction | limiting in particular about the polymerization method at the time of superposing | polymerizing the said monomer component, For example, well-known polymerization methods, such as block polymerization, solution polymerization, suspension polymerization, and emulsion polymerization, are employable. In the polymerization, a radical polymerization initiator is usually used, and a radical polymerization initiator and a chain transfer agent are preferably used.

  Examples of the polymerization initiator include radical polymerization initiators such as azo compounds such as azobisisobutyronitrile, organic peroxides such as lauroyl peroxide and 1,1-di (tert-butylperoxy) cyclohexane. Preferably used. A polymerization initiator may be used individually, respectively, and may be used in combination of 2 or more type. What is necessary is just to determine the quantity of a polymerization initiator suitably according to the kind of monomer, its ratio, etc.

  As the chain transfer agent, for example, mercaptans such as n-butyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan, 2-ethylhexyl thioglycolate and the like are preferably used. A chain transfer agent may be used individually, respectively, and may be used in combination of 2 or more type. The amount of the chain transfer agent may be appropriately determined according to the type of monomer and the ratio thereof.

  The polymerization temperature at the time of polymerizing the monomer component may be appropriately set and is not particularly limited.

  The weight average molecular weight in the acrylic resin is preferably 70000 to 300000, more preferably 70000 to 250,000, and even more preferably 80000 to 200000 in terms of good mechanical strength.

The acrylic resin preferably has a melt mass flow rate (MFR) measured at a temperature of 230 ° C. and a load of 3.8 kg of 0.1 to 30 g / 10 min, more preferably 0.2 to 20 g / 10 min. . When the MFR exceeds 30 g / 10 min, the mechanical strength of the resin composition and the molded product tends to be insufficient. When the MFR is less than 0.1 g / 10 min, the fluidity and workability of the acrylic resin are lowered. Thus, melt kneading tends to be difficult.

  In addition to the copolymer obtained by polymerizing the monomer components, acrylic resins include mold release agents, ultraviolet absorbers, dyes, pigments, polymerization inhibitors, antioxidants, flame retardants, and reinforcement. You may contain additives, such as an agent, polymers other than the said copolymer, etc. in the range which does not impair the effect of this invention. When the acrylic resin contains an additive or a polymer, the content of the copolymer with respect to the total amount of the acrylic resin is preferably 95 to 99.999% by weight.

<Polycarbonate resin>
Polycarbonate resin, the temperature 300 ° C., a MVR is 50~160cm ³ / 10min as measured at a load 1.2kg load, preferably 60~150cm ³ / 10min, more preferably 70~140cm ³ / 10min, 80~ 130cm ³ / 10min is more preferable. If MVR is less than 50 cm ³ / 10min, the resin composition and mechanical strength of the molded article is insufficient, the MVR exceeds 160cm ³ / 10min, reduces the flowability and processability of polycarbonate resins, Since melt-kneading becomes difficult and the transparency of the resin composition and the molded product thereof is lowered, neither is preferable.

  Examples of the polycarbonate resin include those obtained by reacting a dihydric phenol and a carbonylating agent by an interfacial polycondensation method or a melt transesterification method; by polymerizing a carbonate prepolymer by a solid phase transesterification method or the like. What is obtained; those obtained by polymerizing a cyclic carbonate compound by a ring-opening polymerization method, and the like.

  Examples of the dihydric phenol include hydroquinone, resorcinol, 4,4′-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, bis {(4-hydroxy-3,5-dimethyl) phenyl} methane, 1,1- Bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 2,2-bis (4-hydroxyphenyl) propane (commonly called bisphenol A), 2,2-bis { (4-hydroxy-3-methyl) phenyl} propane, 2,2-bis {(4-hydroxy-3,5-dimethyl) phenyl} propane, 2,2-bis {(4-hydroxy-3,5-dibromo) ) Phenyl} propane, 2,2-bis {(3-isopropyl-4-hydroxy) phenyl} propane, 2,2-bis {(4 -Hydroxy-3-phenyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) ) -3,3-dimethylbutane, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 2,2-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxyphenyl)- 4-methylpentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -4-isopropylcyclohexane, 1,1-bis (4-hydroxyphenyl) -3,3 , 5-trimethylcyclohexane, 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis {(4-hydroxy 3-methyl) phenyl} fluorene, α, α′-bis (4-hydroxyphenyl) -o-diisopropylbenzene, α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene, α, α′-bis (4-hydroxyphenyl) -p-diisopropylbenzene, 1,3-bis (4-hydroxyphenyl) -5,7-dimethyladamantane, 4,4′-dihydroxydiphenylsulfone, 4,4′-dihydroxydiphenylsulfoxide, 4 , 4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl ketone, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl ester, etc., and if necessary, use two or more of them You can also.

  Among them, bisphenol A, 2,2-bis {(4-hydroxy-3-methyl) phenyl} propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) -3 -Methylbutane, 2,2-bis (4-hydroxyphenyl) -3,3-dimethylbutane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4-hydroxyphenyl) It is preferable to use one or more dihydric phenols selected from the group consisting of -3,3,5-trimethylcyclohexane and α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene. In particular, use of bisphenol A alone, bisphenol A, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 2,2-bis {(4-hydroxy-3-methyl) phenyl } Combination with one or more dihydric phenols selected from the group consisting of propane and α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene is preferred.

  Examples of the carbonylating agent include carbonyl halides such as phosgene, carbonate esters such as diphenyl carbonate, and haloformates such as dihaloformates of dihydric phenols, and two or more of them can be used as necessary.

  The polycarbonate resin includes a release agent, an ultraviolet absorber, a dye, a pigment, a polymerization inhibitor, an antioxidant, a flame retardant, a reinforcing agent and other additives, and polymers other than the polycarbonate resin. You may make it contain in the range which does not impair the effect.

<Resin composition>
The resin composition includes an acrylic resin and a polycarbonate resin, and the content ratio of the acrylic resin and the polycarbonate resin in the resin composition is 100 parts by weight of the total amount of the acrylic resin and the polycarbonate resin. In this case, the content of the acrylic resin is 50 to 95 parts by weight, preferably 50 to 80 parts by weight, and the content of the polycarbonate resin is 5 to 50 parts by weight, preferably 20 to 50 parts by weight. When the content of the polycarbonate-based resin is less than 5 parts by weight, the heat resistance is not sufficiently improved, and when it exceeds 50 parts by weight, the transparency of the resin composition and the molded product thereof is lowered, so that neither is preferable.

  The resin composition preferably has a ratio (ηA / ηB) of the melt viscosity (ηA) of the acrylic resin and the melt viscosity (ηB) of the polycarbonate resin at 240 ° C. of 0.4 to 3.0. When this ratio is within the predetermined range, the acrylic resin and the polycarbonate resin can be melted and kneaded more uniformly.

The resin composition can be obtained, for example, by melt-kneading a resin mixture containing an acrylic resin and a polycarbonate resin. As the temperature and shear rate at the time of melt kneading of the resin mixture, the temperature is usually from 180 to 320 ° C., preferably from 200 to 300 ° C., and the shear rate is usually from 10 to 10 ° C. from the point of uniformly melting and kneading these resins. 300 sec ⁻¹ , preferably 30 to 150 sec ⁻¹ . As an apparatus used for melt kneading, an ordinary mixer or kneader can be used. Specifically, a uniaxial kneading extruder, a biaxial kneading extruder, a ribbon blender, a Henschel mixer, a Banbury mixer, a drum tumbler, and the like can be used, and among these, a biaxial kneading extruder is preferable. Further, the melt-kneading can be performed in an atmosphere of an inert gas such as nitrogen gas, argon gas, helium gas, if necessary.

  The resin composition of the present invention includes a compatibilizer, a stabilizer, an antioxidant, a light stabilizer, a colorant, a foaming agent, and a lubricant as long as the object of the present invention is not impaired, in addition to the acrylic resin and the polycarbonate resin. Conventional additives such as mold release agents, antistatic agents, flame retardants, flame retardant aids, and diffusing agents may be blended. Moreover, you may add a small amount of other thermoplastic resins. These additives and other thermoplastic resins may be added during the melt kneading of the resin mixture containing the acrylic resin and the polycarbonate resin, or may be added before or after the melt kneading. The total content of the acrylic resin and the polycarbonate resin with respect to the total amount of the resin composition is preferably 70 to 99.995% by weight.

  Thus, the resin composition of the present invention having excellent transparency can be obtained. The resin composition is excellent in transparency, so that it can be used as a raw material for optical members, cover materials, resin glazing materials, etc., and among them, an optical member that requires particularly excellent transparency, particularly a raw material for a light guide plate Can be preferably used.

<Molded body>
By molding the resin composition, a molded body having excellent transparency can be obtained. This molded body is excellent in transparency, and can be used, for example, as an optical member, a cover material, a resin glazing material, etc. Among them, it is particularly suitable as an optical member that requires particularly excellent transparency, particularly as a light guide plate. It can be used.

  Molding of the resin composition of the present invention may be performed by molding the resin mixture previously melt-kneaded by the above-described production method using the melt-kneader as it is, and the obtained resin composition is pelletized. After that, melt molding may be performed in the molding machine using a molding machine such as an injection molding machine, a hydraulic press, or extrusion molding.

  Hereinafter, although a reference example, an example, and a comparative example are given and the present invention is explained still more concretely, the present invention is not limited by these examples. In addition, the measurement and evaluation of various physical properties of the acrylic resin, the polycarbonate resin, the obtained resin composition, and the molded body were performed by the following methods.

<Melt Mass Flow Rate (MFR)>
The obtained pellet-shaped acrylic resin was measured at a temperature of 230 ° C. and a load of 3.8 kg in accordance with JIS K7210.

<Melt volume flow rate (MVR)>
The polycarbonate resin was measured at a temperature of 300 ° C. and a load of 1.2 kg in accordance with ISO 1133.

<Appearance>
The obtained resin composition was visually observed to evaluate the appearance.

<Total light transmittance>
The obtained molded body was cut into a width of 50 mm and a length of 50 mm to obtain a test piece. About the obtained test piece, the total light transmittance was measured based on JISK7361-1 using the transmittance meter ("HR-100" by Murakami Color Research Laboratory Co., Ltd.).

<Long light path total light transmittance>
The obtained molded body was cut into a width of 5 mm and a length of 200 mm to obtain a test piece. About the obtained test piece, the total light transmittance in optical path length 200mm was measured using the spectrophotometer ("Hitachi spectrophotometer U-4000" by Hitachi High-Tech Fielding Co., Ltd.).

<Vicat softening temperature>
The obtained molded body was cut into a size of 20 mm × 20 mm to obtain a test piece. About the obtained test piece, based on JIS K7206 B50 method, Vicat softening temperature (VST) was measured on condition of load 50N and temperature increase rate of 50 degreeC / hour.

<Water absorption rate>
The obtained molded body was cut into a width of 30 mm and a length of 30 mm to obtain a test piece. The obtained test piece was vacuum-dried at 90 ° C. for 48 hours, and further allowed to stand in an environment of 23 ° C. and 55% humidity for 24 hours. The weight of the 24-hour standing specimen was W _0. Subsequently, the test piece was immersed in water for 3000 hours. The weight of the 3000-hour immersion is allowed specimens was W _1. From this _{W 0} and _{W 1,} wherein: water absorption _{(%) = (W 1 -W} 0) / W based on ₀ × 100, was calculated water absorption.

  In Examples and Comparative Examples, acrylic resins (A-1) and (A-2) were used. Acrylic resins (A-1) and (A-2) were prepared as follows.

Reference example 1
[Production of acrylic resin (A-1)]
79% by weight of methyl methacrylate (MMA), 20% by weight of cyclohexyl methacrylate (CHMA), 1% by weight of methyl acrylate (MA), 0.2% by weight of lauryl peroxide as an initiator based on the sum of MMA and CHMA, As a chain transfer agent, n-octyl mercaptan was mixed with 0.2% by weight based on the total amount of MMA and CHMA to obtain a mixture. Next, 100 parts by weight of the mixture, 285 parts by weight of ion-exchanged water, and 0.18 part by weight of a 1.2% by weight sodium polyacrylate aqueous solution as a suspension stabilizer were mixed, followed by suspension polymerization at 80 ° C. for 3 hours. It was. The obtained slurry-like reaction liquid was dehydrated and washed with a dehydrator and then dried to obtain a bead-shaped acrylic resin. Furthermore, the obtained bead-shaped acrylic resin was rotated at a rotational speed of 200 rpm (shear speed of 120 sec ⁻¹ ) and a cylinder temperature of 250 ° C. with a twin-screw kneader (TEX-30, manufactured by Nippon Steel Works). After melt-kneading, the melt was extruded into a strand shape, cooled, and then cut with a strand cutter to obtain a pellet-shaped acrylic resin (A-1). The obtained pellet-shaped acrylic resin (A-1) had a viscosity average molecular weight of 140,000 and an MFR of 1.6 g / 10 min.

Reference example 2
[Production of acrylic resin (A-2)]
A pellet-shaped acrylic resin (A-2) was obtained in the same manner as in Example 1 except that MMA was 84 wt% and CHMA was 15 wt%. The obtained pellet-shaped acrylic resin (A-2) had a viscosity average molecular weight of 140000 and an MFR of 1.3 g / 10 min.

[Production of acrylic resin (A-3)]
95% by weight of methyl methacrylate (MMA), 4% by weight of cyclohexyl methacrylate (CHMA), 1% by weight of methyl acrylate (MA), 0.2% by weight of lauryl peroxide as an initiator based on the total amount of MMA and CHMA, As a chain transfer agent, n-octyl mercaptan was mixed with 0.2% by weight based on the total amount of MMA and CHMA to obtain a mixture. Next, 100 parts by weight of the mixture, 285 parts by weight of ion-exchanged water, and 0.18 part by weight of a 1.2% by weight sodium polyacrylate aqueous solution as a suspension stabilizer were mixed, followed by suspension polymerization at 80 ° C. for 3 hours. It was. The obtained slurry-like reaction liquid was dehydrated and washed with a dehydrator and then dried to obtain a bead-shaped acrylic resin. Furthermore, the obtained bead-shaped acrylic resin was rotated at a rotational speed of 200 rpm (shear speed of 120 sec ⁻¹ ) and a cylinder temperature of 250 ° C. with a twin-screw kneader (TEX-30, manufactured by Nippon Steel Works). After melt-kneading, the melt was extruded into a strand shape, cooled, and then cut with a strand cutter to obtain a pellet-shaped acrylic resin (A-3). The viscosity average molecular weight of the obtained acrylic acrylic resin (A-3) was 140000.

In Examples and Comparative Examples, polycarbonate resins (B-1) and (B-2) were used. The polycarbonate resins (B-1) and (B-2) are as follows.
Polycarbonate resin (B-1): “Caliver 301-40” manufactured by Sumika Stylon Polycarbonate Co., Ltd. MVR is 40cm ³ / 10min.
Polycarbonate resin (B-2): “Caliver 200-80” manufactured by Sumika Stylon Polycarbonate Co., Ltd. MVR is 80cm ³ / 10min.

Examples 1-3, Comparative Examples 1-3
[Production of resin composition]
A type and weight of the acrylic resin and polycarbonate resin shown in Table 1 are mixed into a twin-screw kneading extruder (“TEX-30SS” manufactured by Nippon Steel Works, Ltd., screw length (L) and screw diameter (D ) And a ratio (L / D) = 41), the mixture was melt-kneaded at a rotation speed of 100 rpm (shear rate of 81 sec ⁻¹ ) and a cylinder temperature of 250 ° C. When the temperature of the melt immediately after being discharged from the die of the twin-screw kneading extruder was measured, it was in the range of 250 to 255 ° C. The melt was extruded into a strand shape, cooled, and then cut with a strand cutter to obtain a pellet-shaped resin composition.

[Production of molded body]
The pellet-shaped resin composition is melt-kneaded using a 40 mmφ single screw extruder (“VS40-28 type vent extruder” manufactured by Tanabe Plastics Machine Co., Ltd.) at a rotation speed of 60 rpm and a cylinder temperature of 250 ° C. Then, the melt was extruded into a plate shape to obtain a plate-like molded body having a thickness of 2 mm.

Table 2 summarizes the appearance of the resin composition, and the total light transmittance, long light path total light transmittance, Vicat softening temperature, and water absorption rate of the molded body.

Claims (6)

A resin composition comprising an acrylic resin and a polycarbonate resin,
The acrylic resin is a polymerized monomer component consisting of 50 to 95% by weight of methyl methacrylate , 5 to 50% by weight of ( meth) acrylic acid ester, and 0.1 to 20% by weight of other monofunctional monomers. Wherein the (meth) acrylic acid ester is selected from the group consisting of cyclohexyl methacrylate, phenyl methacrylate, naphthyl methacrylate, dicyclopentanyl methacrylate and dicyclopentenyl methacrylate. At least one, the total amount of methyl methacrylate, (meth) acrylic acid ester and other monofunctional monomers in the monomer component is 100% by weight,
Polycarbonate-based resin, temperature of 300 ° C., a melt volume flow rate measured under a load 1.2kg is 50~160cm ³ / 10min,
A resin composition in which the acrylic resin content is 50 to 95 parts by weight and the polycarbonate resin content is 5 to 50 parts by weight when the total amount of the acrylic resin and the polycarbonate resin is 100 parts by weight. The monofunctional monomer is methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, t-butyl acrylate, sec-butyl acrylate, isobutyl acrylate and acrylic acid. The resin composition according to claim 1, which is at least one selected from the group consisting of 2-ethylhexyl. The resin composition according to claim 1 or 2 , wherein the acrylic resin has a weight average molecular weight of 70,000 to 300,000. A method for producing the resin composition according to any one of claims 1 to 3 ,
A step of melt kneading a resin mixture containing an acrylic resin and a polycarbonate resin at a shear rate of 10 to 300 sec ⁻¹ at a temperature of 180 to 320 ° C .;
The manufacturing method of the resin composition containing this. The molded object obtained by shape | molding the resin composition in any one of Claims 1-3 . The light guide plate obtained by molding the resin composition according to any one of claims 1-3.