JP2019189810A - Manufacturing method of polycarbonate resin composition pellet, and manufacturing method of molded article - Google Patents

Abstract

To provide a polycarbonate resin composition pellet suitable as a molding material of a light guide member and excellent in hue, and a molded article of the polycarbonate resin composition pellet.SOLUTION: There is provided a manufacturing method of a polycarbonate resin composition pellet by melting and mixing a polycarbonate resin composition containing 100 pts.mass of a polycarbonate resin (A), 0.05 to 3 pts.mass of alkyl alcohol having 4 to 16 carbon atoms (B), and 0.005 to 0.5 pts.mass of a phosphorus stabilizer (C), in which content of the alkyl alcohol (B) in the resulting pellet is 0.001 to 1.5 mass%.SELECTED DRAWING: None

Description

  The present invention relates to a method for producing a polycarbonate resin composition pellet and a method for producing a molded article. Specifically, the present invention relates to a method for producing a polycarbonate resin composition pellet excellent in hue, which is suitable as a molding material for a light guide member, and a method for producing a molded product by molding the polycarbonate resin composition pellet.

  In recent years, in Europe, North America, etc., daylighting of automobiles has been promoted to improve visibility from daytime pedestrians and oncoming vehicles by installing daylights that are always lit on the headlamps and rear lamps of automobiles. . The daylight generally includes a light guide member and a light source that causes light to enter the light guide member.

  Conventionally, it has been proposed to use an aromatic polycarbonate resin composition as a constituent material of the light guide member, but the aromatic polycarbonate resin composition deteriorates due to heat received in the molding process, The resulting molded product may be slightly yellowish. However, in the use of a light guide member incorporated in an automobile lighting device, for example, a 300 mm long YI value measured for a 300 mm long optical path molded product is small, and it is desirable to have an advanced hue. .

  In Patent Document 1, as an aromatic polycarbonate resin composition having an excellent hue suitable for use in a light guide member incorporated in an automotive lighting device, a polyalkylene together with a specific phosphorus-based stabilizer is added to an aromatic polycarbonate resin. The thing which blended glycol is proposed.

JP-A-2006-145325

  The aromatic polycarbonate resin composition of Patent Document 1 can provide a molded product having an excellent hue such that a 300 mm long YI value measured for a 300 mm long optical path molded product is 20 or less. In the use of a light guide member incorporated in the photographic material, further improvement in hue is desired.

  It is an object of the present invention to provide a polycarbonate resin composition pellet having a remarkably excellent hue, which is also suitable for use as a light guide member incorporated in an automobile lighting device, and a molded article of the polycarbonate resin composition pellet. To do.

  As a result of intensive studies on the components in the polycarbonate resin composition pellets, the present inventor has solved the above problems by using specific alkyl alcohols and phosphorus stabilizers at a predetermined ratio. Found to get.

  The present invention has been achieved based on such findings, and the gist thereof is as follows.

[1] 0.05 to 3 parts by mass of an alkyl alcohol (B) having 4 to 16 carbon atoms and 0.005 to 0.5 parts by mass of a phosphorus stabilizer (C) with respect to 100 parts by mass of the polycarbonate resin (A). And a polycarbonate resin composition pellet by melting and kneading a polycarbonate resin composition containing a part, wherein the content of the alkyl alcohol (B) in the obtained pellet is 0.001 to 1.5 mass%. A process for producing a polycarbonate resin composition pellet, wherein

[2] The method of producing a polycarbonate resin composition pellet according to [1], wherein the polycarbonate resin composition further contains 0.01 to 0.5 parts by mass of an epoxy compound (D).

[3] The method for producing a polycarbonate resin composition pellet according to [1] or [2], wherein the melt-kneading temperature is 240 to 320 ° C.

[4] A method for producing a molded product, comprising molding a pellet obtained by the method for producing a polycarbonate resin composition pellet according to any one of [1] to [3].

According to the present invention, a polycarbonate resin composition pellet capable of obtaining a molded article having a remarkably good hue satisfying a YI value of 300 mm length measured for a 300 mm long optical path molded article of about 16.5 or less is produced. Can do.
For this reason, the light guide member which can obtain high light transmission efficiency can be manufactured even if it is long or thick using the polycarbonate resin composition pellet manufactured by this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

[Production method of polycarbonate resin composition pellets]
The manufacturing method of the polycarbonate resin composition pellets of the present invention comprises 0.05 to 3 parts by mass of an alkyl alcohol (B) having 4 to 16 carbon atoms and 100 parts by mass of a phosphorus stabilizer (A). C) Polycarbonate resin composition containing 0.005 to 0.5 parts by mass (hereinafter sometimes referred to as “the polycarbonate resin composition of the present invention”) is melt-kneaded to produce polycarbonate resin composition pellets. The content of the alkyl alcohol (B) in the obtained pellet (hereinafter sometimes referred to as “the pellet of the present invention”) is 0.001 to 1.5 mass%. The polycarbonate resin composition of the present invention may further contain 0.01 to 0.5 parts by mass of the epoxy compound (D).
In addition, content of the alkyl alcohol (B) in the pellet of this invention is the value measured by the method as described in the term of the below-mentioned Example.

<Polycarbonate resin (A)>
Any conventionally known polycarbonate resin can be used as the polycarbonate resin (A). Examples of the polycarbonate resin (A) include aromatic polycarbonate resins, aliphatic polycarbonate resins, and aromatic-aliphatic polycarbonate resins, and aromatic polycarbonate resins are preferable.

  An aromatic polycarbonate resin is an aromatic polycarbonate polymer obtained by reacting an aromatic hydroxy compound with a diester of phosgene or carbonic acid. The aromatic polycarbonate polymer may have a branch. The method for producing the aromatic polycarbonate resin is not particularly limited, and may be a conventional method such as a phosgene method (interfacial polymerization method) or a melting method (transesterification method).

  Typical examples of the aromatic dihydroxy compound include bis (4-hydroxyphenyl) methane, 2,2-bis (4-hydroxyphenyl) propane, and 2,2-bis (4-hydroxy-3-methylphenyl). ) Propane, 2,2-bis (4-hydroxy-3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4-hydroxy) -3,5-dibromophenyl) propane, 4,4-bis (4-hydroxyphenyl) heptane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 4,4'-dihydroxybiphenyl, 3,3 ', 5 , 5′-tetramethyl-4,4′-dihydroxybiphenyl, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) Le) sulfide, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) ketone.

Among the aromatic dihydroxy compounds, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) is particularly preferable.
The aromatic dihydroxy compounds may be used alone or in combination of two or more.

  In producing the aromatic polycarbonate resin, a small amount of polyhydric phenol having 3 or more hydroxy groups in the molecule may be added in addition to the aromatic dihydroxy compound. In this case, the aromatic polycarbonate resin has a branch.

  Examples of the polyhydric phenol having three or more hydroxy groups include phloroglucin, 4,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4. , 6-tris (4-hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-3, 1,3,5-tris (4-hydroxyphenyl) benzene, Polyhydroxy compounds such as 1,1,1-tris (4-hydroxyphenyl) ethane, or 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol), 5-chlorouisatin, 5,7-dichloroisatin , 5-bromoisatin and the like. Among these, 1,1,1-tris (4-hydroxylphenyl) ethane or 1,3,5-tris (4-hydroxyphenyl) benzene is preferable. The amount of the polyhydric phenol used is preferably an amount of 0.01 to 10 mol%, more preferably 0.1 to 2 mol%, based on the aromatic dihydroxy compound (100 mol%). It is.

  In the polymerization by the transesterification method, a carbonic acid diester is used as a monomer instead of phosgene. Representative examples of the carbonic acid diester include substituted diaryl carbonates typified by diphenyl carbonate and ditolyl carbonate, and dialkyl carbonates typified by dimethyl carbonate, diethyl carbonate, and di-tert-butyl carbonate. These carbonic acid diesters can be used alone or in combination of two or more. Among these, diphenyl carbonate and substituted diphenyl carbonate are preferable.

  The carbonic acid diester may preferably be substituted with dicarboxylic acid or dicarboxylic acid ester in an amount of 50 mol% or less, more preferably 30 mol% or less. Representative dicarboxylic acids or dicarboxylic acid esters include terephthalic acid, isophthalic acid, diphenyl terephthalate, and diphenyl isophthalate. When a part of the carbonic acid diester is substituted with such a dicarboxylic acid or dicarboxylic acid ester, a polyester carbonate is obtained.

  When an aromatic polycarbonate resin is produced by a transesterification method, a catalyst is usually used. Although there is no restriction | limiting in a catalyst seed | species, Generally basic compounds, such as an alkali metal compound, an alkaline-earth metal compound, a basic boron compound, a basic phosphorus compound, a basic ammonium compound, an amine compound, are used. Of these, alkali metal compounds and / or alkaline earth metal compounds are particularly preferred. These may be used individually by 1 type and may be used in combination of 2 or more types. In the transesterification method, the catalyst is generally deactivated with p-toluenesulfonic acid ester or the like.

  The aromatic polycarbonate resin can be copolymerized with a polymer or oligomer having a siloxane structure for the purpose of imparting flame retardancy and the like.

The viscosity average molecular weight of the polycarbonate resin (A) is preferably 10,000 to 22,000. When the viscosity average molecular weight of the polycarbonate resin (A) is less than 10,000, the molded product obtained may have insufficient mechanical strength, and it may not be possible to obtain a product having sufficient mechanical strength. Further, when the viscosity average molecular weight of the polycarbonate resin (A) exceeds 22,000, the melt viscosity of the polycarbonate resin (A) becomes large. For example, the pellet of the present invention is molded by a method such as injection molding to guide the light guide member. It has excellent hue as a result of not being able to obtain excellent fluidity when producing a long shaped article such as, etc., and increasing the amount of heat generated by the shearing of the resin and degrading the resin by thermal decomposition. There are cases where a molded product cannot be obtained.
The viscosity average molecular weight of the polycarbonate resin (A) is more preferably 12,000 to 18,000, and further preferably 14,000 to 17,000.

  Here, the viscosity average molecular weight is calculated from the solution viscosity measured at a temperature of 20 ° C. using methylene chloride as a solvent.

  The polycarbonate resin (A) may be a mixture of two or more kinds of polycarbonate resins having different viscosity average molecular weights, or a polycarbonate resin having a viscosity average molecular weight outside the above range is mixed to the above range of viscosity average molecular weights. It may be inside.

<Alkyl alcohol (B)>
The alkyl alcohol (B) used in the present invention is an alkyl alcohol having 4 to 12 carbon atoms.
By including the alkyl alcohol (B) in the pellet of the present invention, an excellent hue improving effect can be obtained.

The alkyl alcohol having 4 to 16 carbon atoms (B) is an alcohol having an alkyl group having 4 to 16 carbon atoms, and the alkyl group may be a linear alkyl group or a branched one. May be a cycloalkyl group, but is preferably a linear alkyl group or a branched alkyl group, more preferably a linear alkyl group, and the alkyl group preferably has 4 to 14 carbon atoms, and more preferably Is 4-12.
The alkyl alcohol (B) is preferably a primary alcohol in which a hydroxyl group is bonded to the end of a linear alkyl chain.

  Specific examples of the alkyl alcohol (B) include butanol (n-butanol, isobutanol, tert-butanol), pentanol, hexanol, heptanol, octanol, nonanol, decanol, undecanol, and dodecanol.

  These alkyl alcohols (B) may be used alone or in combination of two or more.

Content of the alkyl alcohol (B) in the pellet of this invention is 0.001-1.5 mass%, Preferably it is 0.10-1.25 mass%.
If the content of the alkyl alcohol (B) in the pellet is excessively large, the molded product may become cloudy or the durability against heat and light may deteriorate. For this reason, the pellet of this invention shall contain alkyl alcohol (B) in the said range.

  Moreover, in order to make the alkyl alcohol (B) content in the pellets of the present invention within the above range, the polycarbonate resin composition of the present invention comprises the alkyl alcohol (B) with respect to 100 parts by mass of the polycarbonate resin (A). 0.05-3 mass parts is included, Preferably this content is 0.1-2.5 mass parts, More preferably, it is 0.3-2.2 mass parts.

<Phosphorus stabilizer (C)>
The phosphorus stabilizer (C) is preferably a phosphite stabilizer (CI) having a spiro ring skeleton (hereinafter sometimes simply referred to as “phosphite stabilizer (CI)”). ) And a phosphite stabilizer (C-II) represented by the following general formula (II) (hereinafter sometimes simply referred to as “phosphite stabilizer (C-II)”). One or more of these can be used, and it is particularly preferable to use a phosphite stabilizer (CI) and a phosphite stabilizer (C-II) in combination.

(In formula (II), R ^{21 to} R ²⁵ each independently represents a hydrogen atom, an aryl group having 6 to 20 carbon atoms, or an alkyl group having 1 to 20 carbon atoms.)

<Phosphite stabilizer (CI)>
The phosphite stabilizer (CI) is not particularly limited as long as it is a phosphite compound having a spiro ring skeleton, and for example, those represented by the following general formula (I) are preferable.

(In formula (I), R ^10A and R ^10B each independently represent an alkyl group having 1 to 30 carbon atoms or an aryl group having 6 to 30 carbon atoms.)

In the general formula (I), the alkyl groups represented by R ^10A and R ^10B are preferably each independently a linear or branched alkyl group having 1 to 10 carbon atoms. When R ^10A and R ^10B are aryl groups, an aryl group represented by any of the following general formulas (I-1), (I-2), or (I-3) is preferable.

(In formula (I-1), R ^A represents an alkyl group having 1 to 10 carbon atoms. In formula (I-2), R ^B represents an alkyl group having 1 to 10 carbon atoms.)

  Examples of the phosphite stabilizer (CI) include bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite represented by the following structural formula (IA). Can be mentioned.

  Preferred examples of the phosphite stabilizer (CI) include compounds represented by the following general formula (IB).

(In formula (IB), R ^{11 to} R ¹⁸ each independently represents a hydrogen atom or an alkyl group, and R ^{19 to} R ²² each independently represents an alkyl group, an aryl group, or an aralkyl group, a to d each independently represents an integer of 0 to 3.)

In the general formula (IB), R ^{11 to} R ¹⁸ are each independently preferably an alkyl group having 1 to 5 carbon atoms, preferably a methyl group, and a to d are 0 is preferred.

  As the compound represented by the general formula (IB), bis (2,4-dicumylphenyl) pentaerythritol diphosphite represented by the following structural formula (Ib) is preferable.

  The phosphite stabilizer (CI) may be used alone or in combination of two or more.

<Phosphite stabilizer (C-II)>
The phosphite stabilizer (C-II) is represented by the general formula (II).

In the general formula (II), examples of the alkyl group represented by R ^{21 to} R ²⁵ include a methyl group, an ethyl group, a propyl group, an n-propyl group, an n-butyl group, a tert-butyl group, a hexyl group, and An octyl group etc. are mentioned.

  As the phosphite stabilizer (C-II), (tris (2,4-di-tert-butylphenyl) phosphite represented by the following structural formula (II-A) is particularly preferable.

  The phosphite stabilizer (C-II) may be used alone or in combination of two or more.

<Content of phosphorus stabilizer (C)>
In the polycarbonate resin composition of the present invention, the content of the phosphorus stabilizer (C) is 0.005 to 0.5 parts by mass, preferably 0.01 to 100 parts by mass with respect to 100 parts by mass of the polycarbonate resin (A). 0.4 mass part, More preferably, it is 0.03-0.3 mass part. When the content of the phosphorus stabilizer (C) in the polycarbonate resin composition is less than the above lower limit, the effect of improving the hue due to the inclusion of the phosphorus stabilizer (C) cannot be obtained, and when the content exceeds the above upper limit. On the contrary, there is a possibility that the hue is lowered, and there is a possibility that the light transmittance of the obtained molded product is lowered because the gas at the time of molding increases or a transfer defect due to mold deposit occurs.

  When the phosphite stabilizer (CI) and the phosphite stabilizer (C-II) are used in combination, for the same reason, the phosphite stabilizer (CI) of the polycarbonate resin composition of the present invention is used. The content is preferably 0.001 to 0.5 parts by mass, more preferably 0.003 to 0.3% by mass, and still more preferably 0.005 to 0.2% with respect to 100 parts by mass of the polycarbonate resin (A). The content of the mass% and the phosphite stabilizer (C-II) is preferably 0.001 to 0.5 mass%, more preferably 0.003 to 0.3 mass%, and further preferably 0.005 to 0. .2% by mass, and the total of these is preferably within the above range.

  Further, in order to more effectively obtain the effect of the combined use of the phosphite stabilizer (CI) and the phosphite stabilizer (C-II), the phosphite contained in the polycarbonate resin composition of the present invention. The content ratio of the system stabilizer (CI) and the phosphite stabilizer (C-II) is 1: 1 to 15, particularly 1: 1.5 to 10, especially 1: 2 to 5 It is preferable that

<Epoxy compound (D)>
As the epoxy compound (D), a compound having one or more epoxy groups in one molecule is used. Specifically, phenyl glycidyl ether, allyl glycidyl ether, t-butylphenyl glycidyl ether, 3,4-epoxycyclohexylmethyl-3 ′, 4′-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl -3 ', 4'-epoxy-6'-methylcyclohexyl carboxylate, 2,3-epoxycyclohexylmethyl-3', 4'-epoxycyclohexyl carboxylate, 4- (3,4-epoxy-5-methylcyclohexyl) Butyl-3 ′, 4′-epoxycyclohexylcarboxylate, 3,4-epoxycyclohexylethylene oxide, cyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl- '-Methylsiloxyl carboxylate, bisphenol-A diglycidyl ether, tetrabromobisphenol-A glycidyl ether, diglycidyl ester of phthalic acid, diglycidyl ester of hexahydrophthalic acid, bis-epoxy dicyclopentadienyl ether, bis -Epoxyethylene glycol, bis-epoxycyclohexyl adipate, butadiene diepoxide, tetraphenylethylene epoxide, octyl epoxytalate, epoxidized polybutadiene, 3,4-dimethyl-1,2-epoxycyclohexane, 3,5-dimethyl-1, 2-epoxycyclohexane, 3-methyl-5-t-butyl-1,2-epoxycyclohexane, octadecyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxyl , N-butyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxylate, cyclohexyl-2-methyl-3,4-epoxycyclohexyl carboxylate, N-butyl-2-isopropyl-3,4-epoxy 5-methylcyclohexyl carboxylate, octadecyl-3,4-epoxycyclohexyl carboxylate, 2-ethylhexyl-3 ′, 4′-epoxycyclohexyl carboxylate, 4,6-dimethyl-2,3-epoxycyclohexyl-3 ′, 4 '-Epoxycyclohexylcarboxylate, 4,5-epoxytetrahydrophthalic anhydride, 3-t-butyl-4,5-epoxytetrahydrophthalic anhydride, diethyl 4,5-epoxy-cis-1,2-cyclohexyldicarboxylate , Di-n- Chill -3-t-butyl-4,5-epoxy - cis-1,2-cyclohexyl dicarboxylate, epoxidized soybean oil, can be preferably exemplified such as epoxidized linseed oil. Of these, alicyclic epoxy compounds having two or more epoxy groups in one molecule are particularly preferable.
An epoxy compound (D) may be used individually by 1 type, or may be used in combination of 2 or more type.

  When the polycarbonate resin composition of the present invention contains an epoxy compound (D), the content thereof is preferably 0.01 to 0.5 parts by mass, more preferably 0.00 with respect to 100 parts by mass of the polycarbonate resin (A). It is 003-0.3 mass%, Most preferably, it is 0.005-0.2 mass%. When the content of the epoxy compound (D) is less than the above lower limit, the effect of improving the hue due to the inclusion of the epoxy compound (D) cannot be sufficiently obtained, and when the upper limit is exceeded, the hue is lowered. Wet heat stability also tends to decrease.

<Other ingredients>
The polycarbonate resin composition of the present invention includes, as optional components, an antioxidant, a release agent, an ultraviolet absorber, a fluorescent whitening agent, a dye / pigment, a flame retardant, and an impact resistance improvement as long as the object of the present invention is not impaired. An agent, an antistatic agent, a lubricant, a plasticizer, a compatibilizing agent, a filler and the like may be blended.

<Production method of polycarbonate resin composition pellet>
Examples of the method for producing the pellets of the present invention include a method in which the respective components are blended in a batch or divided, melt kneaded and pelletized. Here, the compounding amount of each component is within the above-mentioned range. Among these, for the alkyl alcohol (B), the content of the alkyl alcohol (B) in the obtained pellet is within the range of the present invention described above. It adjusts so that it may become a suitable range. That is, when the polycarbonate resin composition is melt-kneaded, depending on the melt-kneading temperature, the blended alkyl alcohol (B) may be partially reduced and the amount may be reduced. It does not correspond to the amount of alkyl alcohol (B) formulated for the preparation of the polycarbonate resin composition. Therefore, in the present invention, after preparing the above-described polycarbonate resin composition of the present invention, the blending amount, melt kneading temperature, etc., so that the content of the alkyl alcohol (B) in the obtained pellet becomes the above-mentioned content. To control.

  Examples of the method of blending each component include a method using a tumbler, a Henschel mixer, etc., and a method of quantitatively feeding to a hopper of an extruder with a feeder and mixing.

For melt-kneading, it is preferable to use, for example, a single-screw kneading extruder, a twin-screw kneading extruder, and the strand of the aromatic polycarbonate resin composition extruded from the discharge nozzle at the tip of the extruder is taken up by a take-off roller, After conveying and cooling in the water tank, the pellets of the aromatic polycarbonate resin composition can be obtained by cutting into a predetermined size with a pelletizer.
The melt-kneading temperature is preferably in the range of 240 to 320 ° C, particularly 250 to 300 ° C, so that the amount of the alkyl alcohol (B) in the obtained pellets is within the target range.

[Production method of molded products]
The manufacturing method of the molded article of the present invention is to mold the above-described pellet of the present invention.

  Although there is no restriction | limiting in particular in the shaping | molding method of the pellet of this invention, For example, an injection molding method, a compression molding method, an injection compression molding method etc. are mentioned, Preferably it is an injection molding method.

  In addition, in order to suppress the thermal deterioration of the resin at the time of shaping | molding and to obtain the thing excellent in the hue, when shape | molding the pellet of this invention, it is preferable to shape | mold in inert gas atmosphere, such as nitrogen.

  The molded product obtained by molding the pellets of the present invention has a significantly better hue than the conventional product. Therefore, the heat generated from the light guide member of the lighting device, particularly from the incandescent lamp as well as the light source of daylight Can be suitably used as a light guide member of an automotive lighting device that is exposed to heating conditions, and by its excellent hue, the light transmission efficiency of the light guide member is maintained high over a long period of time. The replacement frequency can be greatly reduced.

[YI value]
The pellets of the present invention are remarkably excellent in hue, and are measured for 300 mm long optical path molded products obtained by injection molding using the pellets of the present invention according to the method described in the Examples section below. The YI value is usually about 16.5 or less, preferably 15 or less, more preferably 14 or less, and exhibits a remarkably excellent hue not found in conventional products.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist.

  The materials used in the examples and comparative examples are as follows.

<Polycarbonate resin (A)>
A1: "Iupilon (registered trademark) H-4000F" manufactured by Mitsubishi Engineering Plastics Co., Ltd .: Bisphenol A type aromatic polycarbonate resin produced by an interfacial polymerization method (viscosity average molecular weight 15,000)

<Alkyl alcohol (B)>
B1: “n-butanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B2: “Isobutanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B3: “tert-butanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B4: “n-pentanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B5: “n-hexanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B6: “n-heptanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B7: “n-octanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B8: “n-nonanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B9: “n-decanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B10: “n-Undecanol” manufactured by Tokyo Chemical Industry Co., Ltd.
B11: “n-Dodecanol” manufactured by Tokyo Chemical Industry Co., Ltd.

<Phosphorus stabilizer (C)>
<Phosphite stabilizer (CI)>
C1: “Doverphos S-9228” manufactured by Properties & Characteristics: bis (2,4-dicumylphenyl) pentaerythritol diphosphite
<Phosphite stabilizer (C-II)>
C2: “ADEKA STAB AS2112” manufactured by ADEKA: Tris (2,4-di-tert-butylphenyl) phosphite

<Polyalkylene glycol (X)>
X1: “PEG # 1000” manufactured by Wako Pure Chemical Industries, Ltd .: Polyethylene glycol (number average molecular weight 600)
X2: “Uniol D-2000” manufactured by NOF Corporation: Polypropylene glycol (number average molecular weight 2000)
X3: “Uniol PB-700” manufactured by NOF Corporation: Polybutylene glycol (number average molecular weight 700)

[Examples 1 to 22 and Comparative Examples 1 to 4]
<Manufacture of polycarbonate resin composition pellets>
The components shown in Tables 1 and 2 were blended in the proportions shown in Tables 1 and 2 and mixed uniformly with a tumbler mixer to obtain a mixture. This mixture is supplied to a single screw extruder (“VS-40” manufactured by Isuzu Chemical Industries Ltd.) equipped with a full flight screw and a vent, and the screw rotation speed is 80 rpm, the discharge rate is 20 kg / hour, and the barrel temperature is 250 ° C. Kneaded and extruded in a strand form from the tip of the extrusion nozzle. The extrudate was quenched in a water bath and cut and pelletized using a pelletizer to obtain polycarbonate resin composition pellets.
The following analysis and evaluation were performed on the obtained pellets.

<Analysis of content of each component in pellet>
The content of the alkyl alcohol (B) in the pellet was determined by the following GC measurement. Moreover, content of polyalkylene glycol (X) in a pellet was calculated | required by the following NMR measurement.

<GC measurement>
A dichloromethane solution of the pellet was prepared, and acetone was added dropwise thereto to reprecipitate the polymer component, followed by filtration. The concentrated filtrate was dissolved in 5 ml of dichloromethane. This dichloromethane solution was analyzed by gas chromatography (“GC-2010” manufactured by Shimadzu Corporation) equipped with a capillary column (UA-1). The inlet temperature of the gas chromatography was 275 ° C., the detector temperature was 350 ° C., the column temperature was raised from 50 ° C. to 350 ° C., and held at the final temperature for 5 minutes. Using a calibration curve prepared from a standard material prepared separately, the content in the pellet was calculated from the above measurement results.

<NMR measurement>
The pellet was dissolved in deuterated tetrachloroethane, sealed in a special sample tube, and ¹ H NMR spectrum measurement was performed using a nuclear magnetic resonance apparatus (“AVANCE III 500” manufactured by BRUKER). Based on the integration ratio, The content was calculated.

<Evaluation of Hue (YI)>
The pellets were dried with a hot air circulation dryer at 120 ° C. for 4 to 8 hours, and then 300 mm long optical path molded product (6 mm × 4 mm × 300 mm) at a temperature of 280 ° C. with an injection molding machine (“EC100” manufactured by Toshiba Machine Co., Ltd.). , L / d = 50). About this molded article, 300 mm length YI value was measured using the long optical path spectral transmission color meter ("ASA1" by Nippon Denshoku Industries Co., Ltd.).

  These results are shown in Tables 1 and 2.

Tables 1 and 2 show the following.
Even if it mix | blends phosphorus stabilizer (C), the comparative example 1 which does not mix | blend alkyl alcohol (B) is inferior in hue (YI).
Of Comparative Examples 2 to 4 in which polyalkylene glycol (X) was blended in place of alkyl alcohol (B), Comparative Examples 2 and 3 became cloudy, and transparency was impaired. Although the hue of Comparative Example 4 is slightly improved as compared with Comparative Example 1, it is insufficient.
On the other hand, the pellet of Examples 1-22 which mix | blends alkyl alcohol (B) and phosphorus stabilizer (C), and contains alkyl alcohol (B) in a predetermined ratio in a pellet is hue (YI). Is very good.

Claims (4)

  With respect to 100 parts by mass of the polycarbonate resin (A), 0.05 to 3 parts by mass of an alkyl alcohol (B) having 4 to 16 carbon atoms and 0.005 to 0.5 parts by mass of a phosphorus-based stabilizer (C) A method for producing a polycarbonate resin composition pellet by melting and kneading a polycarbonate resin composition to be contained, wherein the content of the alkyl alcohol (B) in the obtained pellet is 0.001 to 1.5 mass%. A process for producing a polycarbonate resin composition pellet.   The said polycarbonate resin composition contains 0.01-0.5 mass part of epoxy compounds (D) further, The manufacturing method of the polycarbonate resin composition pellet of Claim 1 characterized by the above-mentioned.   The method for producing a polycarbonate resin composition pellet according to claim 1 or 2, wherein the melt kneading temperature is 240 to 320 ° C.   The manufacturing method of the molded article characterized by shape | molding the pellet obtained by the manufacturing method of the polycarbonate resin composition pellet of any one of Claim 1 thru | or 3.