CN107418181B - Polycarbonate resin composition and optical molded article - Google Patents

Polycarbonate resin composition and optical molded article Download PDF

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CN107418181B
CN107418181B CN201710695849.9A CN201710695849A CN107418181B CN 107418181 B CN107418181 B CN 107418181B CN 201710695849 A CN201710695849 A CN 201710695849A CN 107418181 B CN107418181 B CN 107418181B
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polycarbonate resin
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榊阳一郎
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Sumika Polycarbonate Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C08L71/02—Polyalkylene oxides
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/10—Transparent films; Clear coatings; Transparent materials

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Abstract

The present invention provides a polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.005 to 3.0 parts by weight of a melt viscosity modifier (B) and 0.005 to 1.0 part by weight of a phosphite ester compound (C), wherein the polycarbonate resin composition is prepared by mixing the polycarbonate resin composition at a measurement temperature of 220 ℃ and a shear rate of 10sec‑1When the melt viscosity is η, the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.95.

Description

Polycarbonate resin composition and optical molded article
The application is application number: 201680007204.5, PCT application number: PCT/JP2016/001711, filing date: a divisional application of the present invention entitled "polycarbonate resin composition and optical molded article" on 24/3/2016.
Technical Field
The present invention relates to a polycarbonate resin composition and an optical molded article.
Background
Polycarbonate resins have been used for molded articles such as light guide plates, various lenses, and labels because of their excellent impact resistance, heat resistance, transparency, and the like.
For example, patent document 1 discloses an aromatic polycarbonate resin composition for a light guide plate, which is obtained by blending a stabilizer and a release agent into an aromatic polycarbonate resin having a ratio of a weight average molecular weight to a number average molecular weight defined in a specific range.
Patent document 2 discloses a polycarbonate resin composition for optical moldings, which is obtained by blending a polycarbonate resin with polystyrene and 1 phosphorus antioxidant.
Further, as disclosed in, for example, patent documents 3 to 6, various resin compositions using a polycarbonate resin and other materials in combination for obtaining excellent light transmittance and improving the luminance of an optical member have been proposed.
However, the polycarbonate resin compositions disclosed in patent documents 3 to 6 do not sufficiently satisfy the recent requirements as a material for light guide plates (particularly, requirements such as no reduction in light transmittance even when molding is performed at high temperatures for thin-wall molding).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2007-Asn 204737
Patent document 2: japanese laid-open patent publication No. H09-020860
Patent document 3: japanese patent laid-open publication No. 2011-133647
Patent document 4: japanese laid-open patent publication No. 11-158364
Patent document 5: japanese patent laid-open publication No. 2001-215336
Patent document 6: japanese patent laid-open publication No. 2004-051700
Disclosure of Invention
Problems to be solved by the invention
The present invention provides a polycarbonate resin composition which does not damage the original characteristics of polycarbonate resin such as heat resistance and mechanical strength, has excellent thermal stability and high light transmittance, and has excellent light transmittance even when the polycarbonate resin is molded at high temperature.
Means for solving the problems
The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that: in a polycarbonate resin composition in which a polycarbonate resin (A) is blended with a melt viscosity modifier (B) and a phosphite ester compound (C), a polycarbonate resin composition having good color tone and brightness and no reduction in light transmittance even when molded at high temperatures can be obtained by satisfying a specific range of value of the ratio of the melt viscosity of the polycarbonate resin composition to the melt viscosity of the polycarbonate resin (A) contained therein.
That is, the present invention provides a polycarbonate resin composition and an optical molded article obtained by molding the same, and a polycarbonate resin compositionThe polycarbonate resin composition is characterized in that the polycarbonate resin composition is prepared by mixing 0.005-3.0 parts by weight of a melt viscosity regulator (B) and 0.005-1.0 part by weight of a phosphite ester compound (C) with 100 parts by weight of a polycarbonate resin (A), and the temperature of the polycarbonate resin composition is 220 ℃ and the shear rate is 10sec-1When the melt viscosity is η, the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.95.
Effects of the invention
The polycarbonate resin composition of the present invention is excellent in thermal stability and weather resistance without impairing the properties such as heat resistance and mechanical strength inherent in polycarbonate resins, and is also excellent in light transmittance even when subjected to molding at high temperatures. Therefore, even in a thin light guide plate having a thickness of, for example, about 0.3mm, the deterioration of appearance due to a change in color tone and the deterioration of the resin itself due to high-temperature molding are less likely to occur, and the industrial value is extremely high.
Detailed Description
The embodiments are described in detail below. However, the above detailed description may be omitted. For example, detailed descriptions of known matters and repetitive descriptions of substantially the same structure may be omitted. This is to avoid over-verbose explanation for the purpose of making it readily understandable to those skilled in the art.
The present inventors have provided the following description in order to enable those skilled in the art to sufficiently understand the present invention, but it is not intended to limit the subject matter described in the claims by these descriptions.
The polycarbonate resin composition used in the present invention is a polycarbonate resin obtained by blending a polycarbonate resin (a), a melt viscosity modifier (B), and a phosphite compound (C). The polycarbonate resin composition used in the present invention may contain other components as needed.
The polycarbonate resin (a) used in the present invention is a polymer obtained by a phosgene method in which various dihydroxy diaryl compounds are reacted with phosgene or a transesterification method in which a dihydroxy diaryl compound is reacted with a carbonate ester such as diphenyl carbonate. As a representative example, a polycarbonate resin produced from 2, 2-bis (4-hydroxyphenyl) propane (bisphenol a) is cited.
Examples of the dihydroxy diaryl compound include, in addition to bisphenol a: bis (hydroxyaryl) alkanes such as bis (4-hydroxyphenyl) methane, 1-bis (4-hydroxyphenyl) ethane, 2-bis (4-hydroxyphenyl) butane, 2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1-bis (4-hydroxy-3-tert-butylphenyl) propane, 2-bis (4-hydroxy-3-bromophenyl) propane, 2-bis (4-hydroxy-3, 5-dibromophenyl) propane and 2, 2-bis (4-hydroxy-3, 5-dichlorophenyl) propane; bis (hydroxyaryl) cycloalkanes such as 1, 1-bis (4-hydroxyphenyl) cyclopentane and 1, 1-bis (4-hydroxyphenyl) cyclohexane; dihydroxydiaryl ethers such as 4,4 ' -dihydroxydiphenyl ether and 4,4 ' -dihydroxy-3, 3 ' -dimethyldiphenyl ether; dihydroxy diaryl sulfides such as 4, 4' -dihydroxy diphenyl sulfide; dihydroxydiaryl sulfoxides such as 4,4 ' -dihydroxydiphenyl sulfoxide and 4,4 ' -dihydroxy-3, 3 ' -dimethyldiphenyl sulfoxide; dihydroxy diaryl sulfones such as 4,4 ' -dihydroxy diphenyl sulfone and 4,4 ' -dihydroxy-3, 3 ' -dimethyl diphenyl sulfone, and these compounds may be used alone or in admixture of 2 or more. In addition to these compounds, piperazine, dipiperidinohydroquinone, resorcinol, 4' -dihydroxybiphenyl, and the like may be used in combination.
Further, the dihydroxy diaryl compound may be used in combination with a 3-membered or higher phenol compound shown below, for example.
Examples of the above-mentioned ternary or higher phenol compound include phloroglucinol, 4, 6-dimethyl-2, 4, 6-tris- (4-hydroxyphenyl) heptene, 2,4, 6-dimethyl-2, 4, 6-tris- (4-hydroxyphenyl) heptane, 1,3, 5-tris- (4-hydroxyphenyl) crude benzene (benzole), 1,1, 1-tris- (4-hydroxyphenyl) ethane, and 2, 2-bis- [4,4- (4, 4' -dihydroxydiphenyl) cyclohexyl ] propane.
The viscosity average molecular weight of the polycarbonate resin (A) is preferably 10000 to 100000, more preferably 12000 to 30000. When producing such a polycarbonate resin (a), a molecular weight modifier, a catalyst, and the like may be used as necessary.
The melt viscosity modifier (B) used in the present invention is a melt viscosity modifier that acts like a lubricant to reduce the shear viscosity (shear viscosity) of the polycarbonate resin when the polycarbonate resin composition is molded, thereby suppressing the generation of shear heat more than necessary and further reducing or suppressing the generation of heat in the polycarbonate resin.
The melt viscosity modifier (B) is selected so that the shear rate is 10sec at a measurement temperature of 220 ℃ and a measurement temperature of 10sec-1The melt viscosity at this time is η, and it can be adjusted so that the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (a) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.95, and there are no particular limitations thereon, and examples thereof include a polyether derivative represented by the following general formula (1), and further, a silicone compound, a glycerin compound, a pentaerythritol compound, and the like.
General formula (1):
RO-(X-O)m(Y-O)n-R’ (1)
(wherein R and R' independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents an alkylene group having 2 to 4 carbon atoms, Y represents a branched alkylene group having 3 to 5 carbon atoms, m and n independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90.)
As the polyether derivative represented by the general formula (1), a modified diol comprising a tetramethylene glycol unit and a 1-ethylglycol unit (for example, HO- (CH) is commercially available2CH2CH2CH2O)24(CH2CH(C2H5)O)13H, etc.), for example, DCD-2000 (weight average molecular weight 2000) manufactured by Nichisu oil Co. The weight average molecular weight of the polyether derivative represented by the general formula (1) is preferably 1000 to 4000.
Among the polyether derivatives represented by the general formula (1), polyether derivatives represented by the following general formula (2), general formula (3) or general formula (4) are preferable as the polyether derivatives.
General formula (2):
HO-(CH2CH2CH2CH2O)m(CH2CH2CH(CH3)CH2O)n-H (2)
(wherein m and n independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90.)
Examples of the polyether derivative represented by the general formula (2) include modified diols (for example, HO- (CH) and the like) containing tetramethylene glycol units and 2-methyltetramethylene glycol units2CH2CH2CH2O)22(CH2CH2CH(CH3)CH2O)5-H, etc.), for example, commercially available in the form of PTG-L1000 (weight average molecular weight 1000), PTG-L2000 (weight average molecular weight 2000), PTG-L3000 (weight average molecular weight 3000), etc., manufactured by Sakuwa chemical industries, Ltd. The weight average molecular weight of the polyether derivative represented by the general formula (2) is preferably 1000 to 4000.
General formula (3):
C4H9O-(CH2CH2)m(CH2CH(CH3)O)n-H (3)
(wherein m and n independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90.)
As the polyether derivative represented by the general formula (3), a modified diol (e.g., C) containing ethylene glycol units and propylene glycol units4H9O-(CH2CH2O)21(CH2CH(CH3)O)14-H、C4H9O-(CH2CH2O)30(CH2CH(CH3)O)30H, etc.) are preferable, and for example, UNILUB 60MB-26I (weight average molecular weight 1700), UNILUB 50MB-72 (weight average molecular weight 3000), etc. are commercially available. The weight average molecular weight of the polyether derivative represented by the general formula (3) is preferably 1000 to 4000.
General formula (4):
HO-(CH2CH2O)m(CH2CH(CH3)O)n-H (4)
(wherein m and n independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90.)
As the polyether derivative represented by the general formula (4), a modified diol comprising ethylene glycol units and propylene glycol units (for example, HO- (CH)2CH2O)17(CH2CH(CH3)O)17-H) is preferred, and for example, UNILUB 50DE-25 (weight average molecular weight 1750) and the like are commercially available. The weight average molecular weight of the polyether derivative represented by the general formula (4) is preferably 1000 to 4000.
Although attempts have been made to improve the light transmittance of polycarbonate resins by adding a linear polyoxyalkylene glycol, the heat resistance of the polyoxyalkylene glycol is insufficient, and therefore, when a polycarbonate resin composition containing the polyoxyalkylene glycol is molded at a high temperature, the luminance and light transmittance of the molded article are reduced. On the other hand, a melt viscosity modifier such as the polyether derivative represented by the above general formula (1) is a 2-functional random copolymer and has high heat resistance, and a polycarbonate resin composition containing the specific polyether derivative represented by the above general formula (1) is molded at high temperature to obtain a molded article having high brightness and light transmittance.
Further, since the melt viscosity modifier (B) used in the present invention has appropriate lipophilicity, it is also excellent in compatibility with the polycarbonate resin (a), and thus the transparency of a molded article obtained from a polycarbonate resin composition containing the melt viscosity modifier (B) is also improved. The weight average molecular weight of the polyether derivative used in the melt viscosity modifier (B) is preferably 1000 to 4000, more preferably 2000 to 3000. When the weight average molecular weight of the polyether derivative is 1000 to 4000, an effect of sufficiently improving the light transmittance can be expected, and there is no risk of the light transmittance being lowered without increasing the fogging rate.
The amount of the polyether derivative is 0.005 to 3.0 parts by weight, preferably 0.1 to 1.5 parts by weight, and more preferably 0.3 to 1.2 parts by weight, based on 100 parts by weight of the polycarbonate resin (A). When the amount of the polyether derivative is less than 0.005 parts by weight, the effect of improving light transmittance and color tone is insufficient. In contrast, in the case where the amount of the polyether derivative exceeds 3.0 parts by weight, the fogging rate increases, resulting in a decrease in light transmittance.
The polycarbonate resin composition of the present invention contains a specific melt viscosity modifier (B) such as a polyether derivative and a phosphite ester compound (C). By blending the melt viscosity modifier (B) and the phosphite ester compound (C) together in this way, it is possible to prevent the polycarbonate resin composition from generating shear heat as much as possible, and it is possible to obtain a polycarbonate resin composition having improved light transmittance even when molded at high temperature without impairing the properties such as heat resistance and mechanical strength which the polycarbonate resin (a) originally has.
The phosphite ester compound (C) used in the present invention is particularly preferably a compound represented by the following general formula (5).
Figure BDA0001379147500000071
(in the formula, R1Represents an alkyl group having 1 to 20 carbon atoms, and a represents an integer of 0 to 3)
In the above general formula (5), R1Preferably an alkyl group having 1 to 20 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms.
Examples of the compound represented by the general formula (5) include triphenyl phosphite, tricresyl phosphite, tris (2, 4-di-t-butylphenyl) phosphite, tris (nonylphenyl) phosphite, and the like. Among these, tris (2, 4-di-t-butylphenyl) phosphite is particularly suitable, and is commercially available, for example, as Irgafos168 (Irgafos, a registered trademark of BASFSocitas Europaea) available from BASF corporation.
The phosphite ester compound may be, for example, a compound represented by the following general formula (6) in addition to the compound represented by the general formula (5).
Figure BDA0001379147500000072
(in the formula, R2、R3、R5And R6Each independently represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, or an alkylcycloalkyl group having 7 to 12 carbon atomsAralkyl or phenyl. R4Represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. X represents a single bond, a sulfur atom or formula: -CHR7- (wherein, R)7Represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms) and A represents an alkylene group having 1 to 8 carbon atoms or a group represented by the formula ＊ -COR8- (wherein, R)8Represents a single bond or an alkylene group having 1 to 8 carbon atoms, ＊ represents a bonding bond on the oxygen side), one of Y and Z represents a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.)
In the general formula (6), R2、R3、R5And R6Each independently represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group.
Examples of the alkyl group having 1 to 8 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-pentyl, isooctyl, tert-octyl, and 2-ethylhexyl groups, examples of the cycloalkyl group having 5 to 8 carbon atoms include cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl groups, examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include 1-methylcyclopentyl, 1-methylcyclohexyl, and 1-methyl-4-isopropylcyclohexyl groups, and examples of the aralkyl group having 7 to 12 carbon atoms include benzyl, α -methylbenzyl, and α -dimethylbenzyl groups.
R is as defined above2、R3And R5Each independently preferably an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms or an alkylcycloalkyl group having 6 to 12 carbon atoms. In particular, R2And R5Each independently preferably represents a tertiary alkyl group such as a tertiary butyl group, a tertiary amyl group, a tertiary octyl group or the like, a cyclohexyl group or a 1-methylcyclohexyl group. In particular, R3Preferably an alkyl group having 1 to 5 carbon atoms such as a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-pentyl group and the like, and more preferably a methyl group, a tert-butyl group or a tert-pentyl group.
R is as defined above6Preferably a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms, and furtherPreferably an alkyl group having 1 to 5 carbon atoms such as a hydrogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-pentyl group and the like.
In the general formula (6), R4Represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the C1-8 alkyl group include the above-mentioned R2、R3、R5And R6The alkyl group exemplified in the description of (1). In particular, R4Preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, more preferably a hydrogen atom or a methyl group.
In the general formula (6), X represents a single bond, a sulfur atom or the formula: -CHR7-a group as shown. Wherein, the formula: -CHR7R in (A-C)7Represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms and the cycloalkyl group having 5 to 8 carbon atoms include those respectively represented by the above R2、R3、R5And R6The alkyl group and the cycloalkyl group are exemplified in the description of (1). In particular, X is preferably a single bond, a methylene group, or a methylene group substituted with a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, or the like, and more preferably a single bond.
In the general formula (6), A represents an alkylene group having 1 to 8 carbon atoms or a formula of ＊ -COR8Examples of the alkylene group having 1 to 8 carbon atoms include methylene, ethylene, propylene, butylene, pentamethylene, hexamethylene, octamethylene, 2-dimethyl-1, 3-propylene, etc., preferably propylene, and the formula is ＊ -COR8R in (A-C)8Represents a single bond or an alkylene group having 1 to 8 carbon atoms. As R8Examples of the alkylene group having 1 to 8 carbon atoms include alkylene groups exemplified in the description of A. R8Preferably a single bond or ethylene, and further, a compound of the formula ＊ -COR8＊ in (A-O) -is a bonding bond on the oxygen side and means that a carbonyl group is bonded to the oxygen atom of the phosphite group.
In the general formula (6), one of Y and Z represents a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the alkoxy group having 1 to 8 carbon atoms include methoxy group and ethoxy groupExamples of the aralkyloxy group having 7 to 12 carbon atoms include a benzyloxy group, α -methylbenzyloxy group, α -dimethylbenzyloxy group and the like, and examples of the alkyl group having 1 to 8 carbon atoms include the above-mentioned R2、R3、R5And R6The alkyl group exemplified in the description of (1).
Examples of the compound represented by the general formula (6) include 2,4,8, 10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] -1,3, 2] dioxaphosphepin (dioxaphosphepin), 6- [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propoxy ] -2,4,8, 10-tetra-tert-butylbenzo [ d, f ] [1,3,2] dioxaphosphepin, 6- [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propoxy ] -4, 8-di-tert-butyl-2, 10-dimethyl-12H-dibenzo [ d, g ] [1,3,2] dioxaphosphorinane tetraene (dioxaphosphocin), 6- [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyloxy ] -4, 8-di-tert-butyl-2, 10-dimethyl-12H-dibenzo [ d, g ] [1,3,2] dioxaphosphorinane tetraene, and the like. Among them, in the case of using the obtained polycarbonate resin composition in a field where optical characteristics are particularly required, 2,4,8, 10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] [1,3,2] dioxaphosphepin is suitable, and is commercially available, for example, in the form of a Sumilizer GP ("Sumilizer" is a registered trademark) manufactured by Sumitomo chemical Co.
The phosphite ester compound (C) may be a compound represented by the general formula (7) in addition to the compound represented by the general formula (5) and the compound represented by the general formula (6).
Figure BDA0001379147500000101
(in the formula, R9And R10Each independently represents an alkyl group having 1 to 20 carbon atoms or an aryl group which may be substituted with an alkyl group, and b and c each independently represent an integer of 0 to 3. )
As the compound represented by the general formula (7), for example, ADKSTAB PEP-36 (ADK STAB is a registered trademark) manufactured by ADEKA Corporation is commercially available.
The amount of the phosphite ester compound (C) is 0.005 to 1.0 part by weight, preferably 0.01 to 0.5 part by weight, and more preferably 0.02 to 0.1 part by weight, based on 100 parts by weight of the polycarbonate resin (A). When the amount of the phosphite compound (C) is less than 0.005 parts by weight, the effect of improving light transmittance and color tone is insufficient. On the other hand, when the amount of the phosphite compound (C) exceeds 1.0 part by weight, the effect of improving the light transmittance and color tone is insufficient.
In addition to the above components, in the polycarbonate resin composition of the embodiment, for example, an ultraviolet absorber which is a component for further improving the weather resistance of the obtained polycarbonate resin composition can be suitably used according to the use of the molded article obtained by molding the polycarbonate resin composition.
As the ultraviolet absorber, for example, ultraviolet absorbers usually blended in polycarbonate resins such as benzotriazole compounds, triazine compounds, benzophenone compounds, and oxanilide compounds can be used singly or in combination of 2 or more.
Examples of the benzotriazole compound include 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (3-tert-butyl-2-hydroxy-5-methylphenyl) -5-chloro-2H-benzotriazole, 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) -2H-benzotriazole, 2- (2H-benzotriazol-2-yl) -4-methyl-6- (3,4,5, 6-tetrahydrophthalimidomethyl) phenol, 2- (2-hydroxy-4-octyloxyphenyl) -2H-benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) -2H-benzotriazole, and benzotriazole compounds such as benzotriazole compounds 2- [2 '-hydroxy-3, 5-bis (1, 1-dimethylbenzyl) phenyl ] -2H-benzotriazole, 2' -methylenebis [6- (2H-benzotriazol-2-yl) 4- (1,1,3, 3-tetramethylbutyl) phenol ], and the like. Among them, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole and the like are preferable, and for example, TINUVIN 329(TINUVIN is a registered trademark) manufactured by BASF, Seesorb 709 manufactured by Shipro Kasei, Kemisorb 79 manufactured by Chemipro Kasei, and the like are commercially available.
Examples of the triazine compound include 2, 4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3, 5-triazine, 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol, 2- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -5- [ (hexyl) oxy ] phenol, and the like, and for example, TIVIN NU1577 manufactured by BASF corporation is commercially available.
Examples of the oxalanilide compound include Sanduvor VSU manufactured by Clariant JAPAN corporation.
Examples of the benzophenone-based compound include 2, 4-dihydroxybenzophenone and 2-hydroxy-4-n-octoxybenzophenone.
The amount of the ultraviolet absorber is 0 to 1.0 part by weight, preferably 0 to 0.5 part by weight, based on 100 parts by weight of the polycarbonate resin (A). In the case where the amount of the ultraviolet absorber (D) exceeds 1.0 part by weight, there is a risk of lowering the initial color tone of the resulting polycarbonate resin composition. In addition, when the amount of the ultraviolet absorber (D) is 0.1 part by weight or more, the effect of further improving the weather resistance of the polycarbonate resin composition is particularly exhibited remarkably.
Further, in the polycarbonate resin composition of the embodiment, various additives such as other antioxidant, colorant, mold release agent, softener, antistatic agent, impact modifier, and the like, polymers other than the polycarbonate resin (a), and the like may be appropriately blended within a range not to impair the effects of the present invention.
The method for producing the polycarbonate resin composition is not particularly limited, and examples thereof include: a method in which the types and amounts of the respective components are appropriately adjusted with respect to the polycarbonate resin (a), the melt viscosity modifier (B), and the phosphite ester compound (C), the various additives described above as necessary, and the polymer other than the polycarbonate resin (a), and these components are mixed by a known mixer such as a tumbler or a ribbon mixer, or a method in which these components are melt-kneaded by an extruder. By these methods, pellets of the polycarbonate resin composition can be easily obtained.
The shape and size of the pellets of the polycarbonate resin composition obtained as described above are not particularly limited, and may be any shape and size that are generally possessed by resin pellets. For example, the shape of the particles may be elliptic cylindrical or cylindrical. The particle size is preferably about 2 to 8mm in length, about 2 to 8mm in the long diameter and about 1 to 4mm in the short diameter of the cross-sectional ellipse in the case of an elliptic cylinder, and about 1 to 6mm in the diameter of the cross-sectional circle in the case of a cylindrical cylinder. The size of each particle obtained may be set to a specific one, the size of all particles forming the particle assembly may be set to a specific one, and the average value of the particle assemblies may be set to a specific one, and is not particularly limited.
The polycarbonate resin composition of the present invention is obtained by molding the polycarbonate resin composition obtained as described above.
The method for producing the polycarbonate resin composition of the present invention is not particularly limited, and examples thereof include a method of molding a polycarbonate resin composition by a known injection molding method, compression molding method, or the like.
As described above, the embodiments have been described as examples of the present invention. However, the technique of the present invention is not limited to this, and can be applied to an embodiment in which modifications, substitutions, additions, omissions, and the like are appropriately made.
Examples
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Unless otherwise specified, "part" and "%" are based on weight.
As the raw materials, the following were used.
1. Polycarbonate resin (a):
polycarbonate resin synthesized from bisphenol A and phosgene
Calibre 200-80
(trade name, manufactured by Sumika Styron Polycarbonate, "Calibre" is a registered trademark of Styron Europe GmbH, viscosity average molecular weight: 15000, hereinafter referred to as "PC")
2. Melt viscosity modifier (B) (polyether derivative of the formula):
2-1. modified diol (polyether derivative) comprising tetramethylene glycol units and 2-methyltetramethylene glycol units:
HO-(CH2CH2CH2CH2O)22(CH2CH2CH(CH3)CH2O)5-H
PTG-L2000
(trade name, manufactured by Baotu chemical Co., Ltd., weight average molecular weight: 2000, hereinafter referred to as "Compound B1")
2-2. modified diols (polyether derivatives) comprising tetramethylene glycol units and 1-ethylglycol units:
HO-(CH2CH2CH2CH2O)24(CH2CH(C2H5)O)13-H
DCD-2000
(trade name, manufactured by Nichikoku corporation, weight average molecular weight: 2000, hereinafter referred to as "Compound B2")
2-3. modified diols (polyether derivatives) comprising ethylene glycol units and propylene glycol units:
C4H9O-(CH2CH2O)30(CH2CH(CH3)O)30-H
UNILUB 50MB-72
(trade name, manufactured by Nichikoku corporation, weight average molecular weight: 3000, hereinafter referred to as "Compound B3")
2-4. modified diols (polyether derivatives) comprising ethylene glycol units and propylene glycol units:
C4H9O-(CH2CH2O)21(CH2CH(CH3)O)14-H
UNILUB 60MB-26I
(trade name, manufactured by Nichikoku corporation, weight average molecular weight: 1700, hereinafter referred to as "Compound B4")
2-5. modified diols (polyether derivatives) comprising ethylene glycol units and propylene glycol units:
HO-(CH2CH2O)17(CH2CH(CH3)O)17-H
UNILUB 50DE-25
(trade name, manufactured by Nichikoku K.K., weight average molecular weight: 1750, hereinafter referred to as "Compound B5")
3. Phosphite ester compound (C):
3-1 tris (2, 4-di-tert-butylphenyl) phosphite of the formula
Figure BDA0001379147500000141
Irgafos168
(trade name, manufactured by BASF corporation, hereinafter referred to as "Compound C1")
3-2.2A 2,4,8, 10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] -1,3, 2] dioxaphosphepin of the formula
Figure BDA0001379147500000142
Sumilizer GP
(trade name, product of Sumitomo chemical Co., Ltd., hereinafter referred to as "Compound C2")
3-3.3, 9-bis (2, 6-di-tert-butyl-4-methylphenoxy) -2,4,8, 10-tetraoxa-3, 9-diphosphaspiro [5,5] undecane of the formula
Figure BDA0001379147500000151
ADK STAB PEP-36
(trade name, manufactured by ADEKA Corporation, hereinafter referred to as "Compound C3")
(examples 1 to 17 and comparative examples 1 to 6)
The above raw materials were put together into a tumbler in the proportions shown in tables 1 and 2, and dry-mixed for 10 minutes, and then melt-kneaded at a melting temperature of 220 ℃ using a twin-screw extruder (TEX 30 α, manufactured by japan steel products, ltd.) to obtain pellets of a polycarbonate resin composition, wherein the pellets obtained in examples and comparative examples were substantially in the shape of an elliptical cylinder, and the average length of each of 100 pellets was about 5.1mm to about 5.4mm, the average major diameter of the cross-sectional ellipse was about 4.1mm to about 4.3mm, and the average minor diameter was about 2.2mm to about 2.3 mm.
Using the obtained pellets, test pieces for evaluation were produced by the following methods and subjected to evaluation. The results are shown in tables 1 and 2.
(method of measuring melt viscosity)
The obtained pellets and pellets of the polycarbonate resin (A) were dried at 120 ℃ for 4 hours or more, and then subjected to a measurement at a temperature of 220 ℃ and a shear rate of 1sec using a capillary rheometer (flow tester CFT-500, manufactured by Shimadzu corporation)-1～100sec-1The melt viscosity was measured in the range of (1). Shear rate 10sec-1The melt viscosity of the polycarbonate resin composition at this time was η 1, and the melt viscosity of the polycarbonate resin (a) was η 2.
(method of preparing test piece)
The obtained pellets were dried at 120 ℃ for 4 hours or more, and then a multi-mesh test piece type A (168 mm in length. times.4 mm in thickness) specified in JIS K7139 "Plastic-test piece" was prepared at a molding temperature of 360 ℃ and a mold temperature of 80 ℃ by using an injection molding machine (manufactured by Fanuc Ltd., ROBOSHOT S2000i 100A). The end face of the test piece was cut, and the cut end face was mirror-finished using a resin plate end face mirror machine (Pla-BeautyPB-500, manufactured by Megaro Technica).
(method of evaluating cumulative transmittance)
A spectrophotometer (UH 4150, manufactured by Hitachi, Ltd.) was equipped with a long light path measurement attachment, and a 50W halogen lamp was used as a light source, and spectral transmittances of test pieces of 1nm were measured over the entire length of the test piece in a region of wavelengths of 380 to 780nm in a state where a light source front mask was 5.6mm × 2.8mm and a sample front mask was 6.0mm × 2.8mm, and the measured spectral transmittances were integrated and rounded off for ten bits to determine respective cumulative transmittances, and it was stated that a cumulative transmittance of 30000 or more was good (represented by ○ in the table) and a cumulative transmittance of less than 30000 was poor (represented by X in the table).
(method of evaluating yellowness)
The yellowness index of each sample was determined to be good at a yellowness index of 20 or less (indicated by ○ in the table), and poor at a yellowness index exceeding 20 (indicated by x in the table), using a standard light source D65, based on the spectral transmittance measured in the cumulative transmittance evaluation method described above.
[ Table 1]
Figure BDA0001379147500000171
[ Table 2]
Figure BDA0001379147500000181
[ Table 3]
Figure BDA0001379147500000191
The polycarbonate resin compositions of examples 1 to 18 were prepared by blending a polycarbonate resin (A) with a melt viscosity modifier (B) such as a specific polyether derivative and a phosphite compound (C) at specific ratios. Therefore, the test piece molded from the polycarbonate resin composition has a high cumulative transmittance and a small yellow color.
Thus, the polycarbonate resin compositions of examples 1 to 18 have high light transmittance in the visible light region without impairing the heat resistance inherent in the polycarbonate resin (A), and have excellent light transmittance even when subjected to molding at high temperature. Further, a molded article obtained by molding such a polycarbonate resin composition has a small yellow color and an excellent color tone, and further has an excellent color tone even when molded at a high temperature.
In contrast, the polycarbonate resin composition of comparative example 1 had a low cumulative transmittance and a large yellowness because the amount of the specific melt viscosity modifier (compound B1) such as a polyether derivative was small. In this manner, the molded article obtained by molding the polycarbonate resin composition of comparative example 1 had a difference in brightness and hue.
The polycarbonate resin composition of comparative example 2 had a low cumulative transmittance and a large yellowness because the amount of the specific melt viscosity modifier (compound B1) was large. In this manner, the molded article obtained by molding the polycarbonate resin composition of comparative example 2 had a difference in brightness and hue.
The polycarbonate resin composition of comparative example 3 had a large yellowness of the test piece because the amount of the phosphite ester compound (C) was small. Thus, the molded article obtained by molding the polycarbonate resin composition of comparative example 3 had a hue difference.
The polycarbonate resin composition of comparative example 4 had a low cumulative transmittance and a large yellowness because the amount of the phosphite ester compound (C) was large. In this manner, the molded article obtained by molding the polycarbonate resin composition of comparative example 4 had a difference in brightness and hue.
The polycarbonate resin composition of comparative example 5 had a low cumulative transmittance and a large yellowness because the amount of the specific melt viscosity modifier (compound B5) was small. In this manner, the molded article obtained by molding the polycarbonate resin composition of comparative example 5 had a difference in brightness and hue.
The polycarbonate resin composition of comparative example 6 had a low cumulative transmittance and a large yellowness because the amount of the specific melt viscosity modifier (compound B5) was large. In this manner, the molded article obtained by molding the polycarbonate resin composition of comparative example 5 had a difference in brightness and hue.
As described above, the embodiments have been described as an example of the technique of the present invention. A detailed description is provided for this purpose.
Therefore, the components described in the detailed description include not only components necessary to solve the problem but also components not necessary to solve the problem in order to exemplify the above-described technology. Therefore, these unnecessary components should not be immediately identified as essential components based on the contents described in the detailed description of these unnecessary components.
Further, the above-described embodiments are intended to exemplify the technique of the present invention, and various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims and the equivalents thereof.
Industrial applicability
The polycarbonate resin composition of the present invention is excellent in thermal stability and weather resistance without impairing the properties such as heat resistance and mechanical strength inherent in polycarbonate resins, and is also excellent in light transmittance even when subjected to molding at high temperatures. Therefore, even in a thin light guide plate having a thickness of, for example, about 0.3mm, the deterioration of appearance due to a change in color tone and the deterioration of the resin itself due to high-temperature molding are less likely to occur, and the industrial value is extremely high.

Claims (10)

1. A polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.005 to 3.0 parts by weight of a melt viscosity modifier (B) and 0.005 to 1.0 part by weight of a phosphite compound (C),
the shear rate is 10sec at a measurement temperature of 220 DEG C-1When the melt viscosity is η, the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.95,
the melt viscosity modifier (B) is a polyether derivative represented by the following general formula (1), the weight average molecular weight of the polyether derivative is 1000-4000,
general formula (1):
RO-(X-O)m(Y-O)n-R’ (1)
in the formula (1), R and R' independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents an alkylene group having 2 to 3 carbon atoms, Y represents a branched alkylene group having 3 to 5 carbon atoms, m and n independently represent an integer of 3 to 60, m + n represents an integer of 8 to 90,
the polycarbonate resin composition does not include a resin composition,
with respect to 100 parts by weight of a bisphenol A polycarbonate having a viscosity average molecular weight of 14500, a resin composition of 0.4 parts by weight of polyoxyethylene glycol-polyoxypropylene glycol, 0.05 parts by weight of bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 0.05 parts by weight of a polyorganosiloxane compound and 0.02 parts by weight of 3, 4-epoxycyclohexenylmethyl 3 ', 4' -epoxycyclohexenylcarboxylate was used;
with respect to 100 parts by weight of a bisphenol A polycarbonate having a viscosity average molecular weight of 14500, a resin composition of 0.4 parts by weight of polyoxyethylene glycol-polyoxypropylene glycol, 0.1 parts by weight of bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 0.05 parts by weight of a polyorganosiloxane compound and 0.02 parts by weight of 3, 4-epoxycyclohexenylmethyl 3 ', 4' -epoxycyclohexenylcarboxylate was used;
with respect to 100 parts by weight of a bisphenol A polycarbonate having a viscosity average molecular weight of 14500, a resin composition using 0.2 parts by weight of polyoxyethylene glycol-polyoxypropylene glycol, 0.05 parts by weight of bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 0.05 parts by weight of a polyorganosiloxane compound, and 0.02 parts by weight of 3, 4-epoxycyclohexenylmethyl 3 ', 4' -epoxycyclohexenylcarboxylate was used;
with respect to 100 parts by weight of bisphenol A polycarbonate having a viscosity average molecular weight of 11500, a resin composition of 0.4 parts by weight of polyoxyethylene glycol-polyoxypropylene glycol, 0.05 parts by weight of bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 0.05 parts by weight of a polyorganosiloxane compound and 0.02 parts by weight of 3, 4-epoxycyclohexenylmethyl 3 ', 4' -epoxycyclohexenylcarboxylate was used.
2. A polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.005 to 3.0 parts by weight of a melt viscosity modifier (B) and 0.005 to 1.0 part by weight of a phosphite compound (C),
the shear rate is 10sec at a measurement temperature of 220 DEG C-1When the melt viscosity is η, the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.80,
the melt viscosity modifier (B) is a polyether derivative represented by the following general formula (1), the weight average molecular weight of the polyether derivative is 1000-4000,
general formula (1):
RO-(X-O)m(Y-O)n-R’ (1)
in the formula (1), R and R' independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents an alkylene group having 2 to 3 carbon atoms, Y represents a branched alkylene group having 3 to 5 carbon atoms, m and n independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90.
3. A polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.005 to 3.0 parts by weight of a melt viscosity modifier (B) and 0.005 to 1.0 part by weight of a phosphite compound (C),
the shear rate is 10sec at a measurement temperature of 220 DEG C-1When the melt viscosity is η, the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.95,
the melt viscosity modifier (B) is a polyether derivative represented by the following general formula (1), the weight average molecular weight of the polyether derivative is 1000-4000,
a test piece obtained by injection molding the polycarbonate resin composition at a molding temperature of 360 ℃ has a cumulative transmittance of 30000 or more in a wavelength region of 380nm to 780nm, wherein the test piece has a total length of 168mm and a thickness of 4mm,
general formula (1):
RO-(X-O)m(Y-O)n-R’ (1)
in the formula (1), R and R' independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents an alkylene group having 2 to 3 carbon atoms, Y represents a branched alkylene group having 3 to 5 carbon atoms, m and n independently represent an integer of 3 to 60, m + n represents an integer of 8 to 90,
the polycarbonate resin composition does not include a resin composition,
with respect to 100 parts by weight of a bisphenol A polycarbonate having a viscosity average molecular weight of 14500, a resin composition of 0.4 parts by weight of polyoxyethylene glycol-polyoxypropylene glycol, 0.05 parts by weight of bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 0.05 parts by weight of a polyorganosiloxane compound and 0.02 parts by weight of 3, 4-epoxycyclohexenylmethyl 3 ', 4' -epoxycyclohexenylcarboxylate was used;
with respect to 100 parts by weight of a bisphenol A polycarbonate having a viscosity average molecular weight of 14500, a resin composition of 0.4 parts by weight of polyoxyethylene glycol-polyoxypropylene glycol, 0.1 parts by weight of bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 0.05 parts by weight of a polyorganosiloxane compound and 0.02 parts by weight of 3, 4-epoxycyclohexenylmethyl 3 ', 4' -epoxycyclohexenylcarboxylate was used;
with respect to 100 parts by weight of a bisphenol A polycarbonate having a viscosity average molecular weight of 14500, a resin composition using 0.2 parts by weight of polyoxyethylene glycol-polyoxypropylene glycol, 0.05 parts by weight of bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 0.05 parts by weight of a polyorganosiloxane compound, and 0.02 parts by weight of 3, 4-epoxycyclohexenylmethyl 3 ', 4' -epoxycyclohexenylcarboxylate was used;
with respect to 100 parts by weight of bisphenol A polycarbonate having a viscosity average molecular weight of 11500, a resin composition of 0.4 parts by weight of polyoxyethylene glycol-polyoxypropylene glycol, 0.05 parts by weight of bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, 0.05 parts by weight of a polyorganosiloxane compound and 0.02 parts by weight of 3, 4-epoxycyclohexenylmethyl 3 ', 4' -epoxycyclohexenylcarboxylate was used.
4. A polycarbonate resin composition comprising a polycarbonate resin (A), a melt viscosity modifier (B) and a phosphite ester compound (C), wherein the polycarbonate resin composition is prepared by mixing 0.005 to 3.0 parts by weight of the melt viscosity modifier (B) and 0.005 to 1.0 part by weight of the phosphite ester compound (C) per 100 parts by weight of the polycarbonate resin (A),
the shear rate is 10sec at a measurement temperature of 220 DEG C-1When the melt viscosity is η, the ratio η 1 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) is η%η 2 satisfies 0.45- η 1/η 2-0.95,
the melt viscosity modifier (B) is a polyether derivative represented by the following general formula (1), the weight average molecular weight of the polyether derivative is 1000-4000,
general formula (1):
RO-(X-O)m(Y-O)n-R’ (1)
in the formula (1), R and R' independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents an alkylene group having 2 to 3 carbon atoms, Y represents a branched alkylene group having 3 to 5 carbon atoms, m and n independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90.
5. The polycarbonate resin composition according to claim 4, wherein the phosphite-based compound (C) is 3, 9-bis (2, 6-di-tert-butyl-4-methylphenoxy) -2,4,8, 10-tetraoxa-3, 9-diphosphaspiro [5,5] undecane.
6. A polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.005 to 3.0 parts by weight of a melt viscosity modifier (B) and 0.005 to 1.0 part by weight of a phosphite compound (C),
the shear rate is 10sec at a measurement temperature of 220 DEG C-1When the melt viscosity is η, the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.80,
the melt viscosity modifier (B) is a polyether derivative represented by the following general formula (1), the weight average molecular weight of the polyether derivative is 1000-4000,
the phosphite ester compound (C) is at least 1 compound selected from the compounds shown in the following general formulas (5) and (6),
general formula (1):
RO-(X-O)m(Y-O)n-R’ (1)
in the formula (1), R and R' independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X represents an alkylene group having 2 to 3 carbon atoms, Y represents a branched alkylene group having 3 to 5 carbon atoms, m and n independently represent an integer of 3 to 60, m + n represents an integer of 8 to 90,
general formula (5):
Figure FDA0002207150410000051
in the formula (5), R1Represents an alkyl group having 1 to 20 carbon atoms or an aryl group optionally substituted with an alkyl group, a represents an integer of 0 to 3,
general formula (6):
Figure FDA0002207150410000052
in the formula (6), R2、R3、R5And R6Each independently represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group, R4Represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and X represents a single bond, a sulfur atom or a group represented by the formula-CHR7-a group represented by (a) wherein R7Represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms, A represents an alkylene group having 1 to 8 carbon atoms or a formula of ＊ -COR8-a group represented by (a) wherein R8Represents a single bond or an alkylene group having 1 to 8 carbon atoms, ＊ represents a bonding bond on the oxygen side, one of Y and Z represents a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.
7. A polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.005 to 3.0 parts by weight of a melt viscosity modifier (B) and 0.005 to 1.0 part by weight of a phosphite compound (C),
the shear rate is 10sec at a measurement temperature of 220 DEG C-1When the melt viscosity is η, the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.95,
the melt viscosity modifier (B) is a polyether derivative represented by the following general formula (4), the weight average molecular weight of the polyether derivative is 1000-4000,
general formula (4):
HO-(CH2CH2O)m(CH2CH(CH3)O)n-H (4)
in the formula (4), m and n independently represent an integer of 3 to 60, m + n represents an integer of 8 to 90,
the phosphite ester compound (C) is tris (2, 4-di-tert-butylphenyl) phosphite.
8. A polycarbonate resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.005 to 3.0 parts by weight of a melt viscosity modifier (B) and 0.005 to 1.0 part by weight of a phosphite compound (C),
the shear rate is 10sec at a measurement temperature of 220 DEG C-1When the melt viscosity is η, the ratio η 1/η 2 of the melt viscosity η 1 of the polycarbonate resin composition to the melt viscosity η 2 of the polycarbonate resin (A) satisfies 0.45. ltoreq. η 1/η 2. ltoreq.0.95,
the melt viscosity modifier (B) is a polyether derivative represented by the following general formula (4), the weight average molecular weight of the polyether derivative is 1000-4000,
general formula (4):
HO-(CH2CH2O)m(CH2CH(CH3)O)n-H (4)
in the formula (4), m and n independently represent an integer of 3 to 60, m + n represents an integer of 8 to 90,
the phosphite ester compound (C) is 2,4,8, 10-tetra-tert-butyl-6- [3- (3-methyl-4-hydroxy-5-tert-butylphenyl) propoxy ] dibenzo [ d, f ] [1,3,2] dioxaphosphepin.
9. An optical molded article comprising the polycarbonate resin composition according to any one of claims 1 to 8.
10. The optical molded article according to claim 9, wherein the molded article is a light guide plate.
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