TWI688605B - Polycarbonate resin composition and molded optical product - Google Patents

Abstract

A polycarbonate resin composition comprises: 100 parts by weight of a polycarbonate resin (A); 0.005-3.0 parts by weight of a melt viscosity modifier (B); and 0.005-1.0 parts by weight of a phosphite ester compound. When a melt viscosity measured at 220℃ and at a shear rate of 10sec^-1 is expressed by η, a ratio η1/η2, that is a ratio of a melt viscosity η1 of the polycarbonate resin composition to a melt viscosity η2 of the polycarbonate resin (A) satisfies 0.45 ≦ η1/η2 ≦ 0.95.

Description

Polycarbonate resin composition and optical molded product

The present invention relates to a polycarbonate resin composition and an optical molded product.

Since polycarbonate resin is excellent in impact resistance, heat resistance, transparency, etc., it is conventionally used for molded products such as light guide plates, various lenses, and nameplates. For example, Patent Literature 1 discloses an aromatic polycarbonate resin composition for a light guide plate, in which the ratio of weight average molecular weight to number average molecular weight is specified in an aromatic polycarbonate resin with a specific range, and a stabilizer is blended And release agent. Patent Document 2 discloses a polycarbonate resin composition for optical moldings, in which polycarbonate resin is blended with polystyrene and one phosphorus-based antioxidant. Others, for example, as disclosed in Patent Documents 3 to 6, various resin compositions have been proposed, which use polycarbonate resins that can obtain excellent light transmittance and improve the brightness of optical members in combination with other materials. However, the polycarbonate resin compositions disclosed in Patent Documents 3 to 6 cannot fully meet the requirements of materials for light guide plates in recent years (especially, when thin-wall molding is performed at high temperatures for forming processing, no penetration occurs. Requirements such as reduction of light rate). [Prior Art Literature] [Patent Literature] [Patent Literature 1] Japanese Patent Laid-Open No. 2007-204737 [Patent Literature 2] Japanese Patent Laid-Open No. 09-020860 [Patent Literature 3] Japanese Patent Laid-Open No. 2011-133647 Gazette [Patent Document 4] Japanese Patent Laid-Open No. 11-158364 [Patent Document 5] Japanese Patent Laid-Open No. 2001-215336 [Patent Document 6] Japanese Patent Laid-Open No. 2004-051700

(Problems to be solved by the invention) The present invention provides a polycarbonate resin composition which does not impair the inherent heat resistance and mechanical strength characteristics of the polycarbonate resin, has excellent thermal stability, and has high light transmittance. Moreover, the light transmittance is also excellent when the molding process is performed at a high temperature. (Technical Means for Solving the Problem) The inventors of the present invention conducted intensive research to solve the related problems, and found that the composition of the polycarbonate resin prepared by blending the melt viscosity modifier (B) in the polycarbonate resin (A) It can be obtained by molding at a high temperature by making the ratio of the melt viscosity of the polycarbonate resin composition to the melt viscosity of the polycarbonate resin (A) contained within a specific range within a certain range The polycarbonate resin composition having no decrease in light transmittance, good color tone, and brightness does not occur, and the present invention has been completed. That is, the present invention provides a polycarbonate resin composition and a molded article for optics obtained by molding the polycarbonate resin composition with respect to 100 parts by weight of the polycarbonate resin (A), and a melt viscosity modifier is blended (B) 0.005 to 3.0 parts by weight, which is characterized in that when the melt viscosity at the measurement temperature of 220°C and the shear rate of 10 sec ^-1 is η, the melt viscosity of the polycarbonate resin composition η1 and The ratio η1/η2 of the melt viscosity η2 of the polycarbonate resin (A) satisfies 0.45≦η1/η2≦0.95. (Comparison with the effect of the prior art) The polycarbonate resin composition of the present invention does not impair the inherent heat resistance and mechanical strength of the polycarbonate resin, has excellent thermal stability and weather resistance, and is carried out at high temperatures In the case of forming, the light transmittance is also excellent. Therefore, for example, even if it is a thin light guide plate with a thickness of about 0.3 mm, the appearance changes or the resin itself deteriorates due to the change in color tone, and the use of industrialization is extremely high.

、二哌啶基對苯二酚、間苯二酚、4,4'-二羥基二苯基等。 進而，亦可混合使用上述二羥基二芳基化合物、及例如以下所示之3價以上之苯酚化合物。 作為上述3價以上之苯酚化合物，例如可列舉間苯三酚、4,6-二甲基-2,4,6-三-(4-羥基苯基)-庚烯、2,4,6-二甲基-2,4,6-三-(4-羥基苯基)-庚烷、1,3,5-三-(4-羥基苯基)-苯、1,1,1-三-(4-羥基苯基)-乙烷及2,2-雙-[4,4-(4,4二羥基二苯基)-環己基]-丙烷等。 聚碳酸酯樹脂(A)之黏度平均分子量較佳為10000～100000，更佳為12000～30000。再者，於製造此種聚碳酸酯樹脂(A)時，能夠視需要使用分子量調節劑、觸媒等。 本發明所使用之熔融黏度調整劑(B)係意指對聚碳酸酯樹脂組成物進行成形加工時，藉由如某種滑劑般作用而降低聚碳酸酯樹脂之剪切黏度(剪切黏度)，抑制產生不必要之剪切發熱，甚至具備能夠減少或者抑制聚碳酸酯樹脂中之發熱之作用者。 作為熔融黏度調整劑(B)，若係於將測定溫度220℃、剪切速度10sec^-1 中之熔融黏度設為η時，能夠以聚碳酸酯樹脂組成物之熔融黏度η1與聚碳酸酯樹脂(A)之熔融黏度η2之比η1/η2滿足0.45≦η1/η2≦0.95之方式進行調整者，則無特別限制，代表性而言，可列舉由下述通式(1)所表示之聚醚衍生物等。其他亦可列舉矽酮系化合物、甘油系化合物、季戊四醇系化合物等。 通式(1)： RO-(X-O)m(Y-O)n-R’ (1) （式中，R及R'分別獨立地表示氫原子或者碳數1～30之烷基；X表示碳數2～4之伸烷基；Y表示碳數3～5之分枝伸烷基；m及n分別獨立表示3～60之整數；m+n表示8～90之整數）。 作為由通式(1)表示之聚醚衍生物，能夠商業性地獲取包含四亞甲基二醇單元與1-乙基乙二醇單元之改質乙二醇(例如，HO-(CH₂ CH₂ CH₂ CH₂ O)₂₄ (CH₂ CH(C₂ H₅ )O)₁₃ -H等)，例如，日油(股)製造之DCD-2000(重量平均分子量2000)等。以通式(1)表示之聚醚衍生物之重量平均分子量較佳為1000～4000。 又，作為聚醚衍生物，由通式(1)表示之聚醚衍生物之中，由下述通式(2)、通式(3)或通式(4)表示之聚醚衍生物較佳。 通式(2)： HO-(CH₂ CH₂ CH₂ CH₂ O)m(CH₂ CH₂ CH(CH₃ )CH₂ O)n-H (2) （式中，m及n分別獨立地表示3～60之整數；m+n表示8～90之整數）。 作為由通式(2)所表示之聚醚衍生物，可列舉包含四亞甲基二醇單元與2-甲基四亞甲基二醇單元之改質乙二醇(例如，HO-(CH₂ CH₂ CH₂ CH₂ O)₂₂ (CH₂ CH₂ CH(CH₃ )CH₂ O)₅ -H等)，例如，能夠商業性地獲取保土谷化學工業(股)製造之PTG-L1000(重量平均分子量1000)、PTG-L2000(重量平均分子量2000)、或PTG-L3000(重量平均分子量3000)等。較佳為由通式(2)表示之聚醚衍生物之重量平均分子量為1000～4000者。 通式(3)： C₄ H₉ O-(CH₂ CH₂ O)m(CH₂ CH(CH₃ )O)n-H (3) （式中，m及n分別獨立地表示3～60之整數；m+n表示8～90之整數）。 作為由通式(3)表示之聚醚衍生物，較佳為包含乙二醇單元與丙二醇單元之改質乙二醇(例如，C₄ H₉ O-(CH₂ CH₂ O)₂₁ (CH₂ CH(CH₃ )O)₁₄ -H或C₄ H₉ O-(CH₂ CH₂ O)₃₀ (CH₂ CH(CH₃ )O)₃₀ -H等)，例如，能夠商業性地獲取Unilube 60MB-26I(重量平均分子量1700)或者Unilube 50MB-72(重量平均分子量3000)等。較佳為由通式(3)所表示之聚醚衍生物之重量平均分子量為1000～4000。 通式(4)： HO-(CH₂ CH₂ O)m(CH₂ CH(CH₃ )O)n-H (4) （式中，m及n分別獨立地表示3～60之整數；m+n表示8～90之整數）。 作為由通式(4)所表示之聚醚衍生物，較佳為包含乙二醇單元與丙二醇單元之改質乙二醇(例如，HO-(CH₂ CH₂ O)₁₇ (CH₂ CH(CH₃ )O)₁₇ -H)，例如，能夠商業性地獲得Unilube 5ODE-25（重量平均分子量1750）等。較佳為由通式(4)所表示之聚醚衍生物之重量平均分子量為1000～4000。 至今，儘管一直嘗試添加直鏈之聚氧伸烷基二醇以提高聚碳酸酯樹脂之透光率，但由於該聚氧伸烷基二醇之耐熱性不充分，故而於高溫下使調配該聚氧伸烷基二醇而得之聚碳酸酯樹脂組成物成形時，成形品之亮度或者透光率降低。與此相對，如由上述通式(1)所表示之聚醚衍生物般之熔融黏度調整劑係2官能性之無規共聚合體，耐熱性較高，於高溫下使調配由該通式(1)所表示之特定之聚醚衍生物而成之聚碳酸酯樹脂組成物成形而得之成形品，其亮度或透光率較高。 又，由於本發明所使用之熔融黏度調整劑(B)具有適度之親油性，與聚碳酸酯樹脂(A)之相容性亦優異，故而自對該熔融黏度調整劑(B)進行調配而得之聚碳酸酯樹脂組成物而獲得之成形品之透明性亦提高。較佳為用於該種熔融黏度調整劑(B)之聚醚衍生物之重量平均分子量為1000～4000，進而較佳為2000～3000。於聚醚衍生物之重量平均分子量為1000～4000之情形時，可期待透光率之充分之提昇效果，且霧化率不上升，亦無透光率降低之虞。 聚醚衍生物之量係相對於聚碳酸酯樹脂(A)100重量份，為0.005～3.0重量份，較佳為0.1～1.5重量份，進而較佳為0.3～1.2重量份。於聚醚衍生物之量未滿0.005重量份之情形時，透光率及色調之提昇效果不充分。相反地，於聚醚衍生物之量超過3.0重量份之情形時，導致霧化率上升且透光率降低。 本發明所使用之熔融黏度調整劑(B)係意指對聚碳酸酯樹脂組成物進行成形加工時，藉由如某種滑劑般作用而降低聚碳酸酯樹脂之剪切黏度(剪切黏度)，抑制產生不必要之剪切發熱，甚至具備能夠減少或者抑制聚碳酸酯樹脂中之發熱之作用者。 於本發明中之聚碳酸酯樹脂組成物中，與特定之聚醚衍生物等之熔融黏度調整劑(B)一起調配有亞磷酸酯系化合物(C)。如此，藉由同時調配對熔融黏度調整劑(B)與亞磷酸酯系化合物(C)，能夠防止極力產生聚碳酸酯樹脂組成物之剪切熱，不損及聚碳酸酯樹脂(A)原本所具有之耐熱性、機械強度等之特性，即使於高溫成形之情形時亦能夠獲得透光率提高之聚碳酸酯樹脂組成物。 作為於本發明之所使用之亞磷酸酯系化合物(C)，例如，由下述通式(5)表示之化合物尤其適合。

(式中，R¹ 表示碳數1～20之烷基，a表示0～3之整數) 於上述通式(5)中，R¹ 係碳數1～20之烷基，進而，較佳為碳數1～10之烷基。 作為以通式(5)表示之化合物，例如可列舉亞磷酸三苯酯、亞磷酸三甲苯酯、參(2,4-二-第三丁基苯基)亞磷酸酯、亞磷酸參(壬基苯酯)等。該等之中，尤其參(2,4-二-第三丁基苯基)亞磷酸酯較為適合，例如，能夠商業性地獲取巴斯夫公司製造之Irgafos168(「Irgafos」為BASF Societas-Europeae之註冊商標)。 作為上述亞磷酸酯系化合物，除了由上述通式(5)所表示之化合物之外，例如亦可列舉由下述通式(6)所表示之化合物。 [化2]

(式中，R² 、R³ 、R⁵ 及R⁶ 分別獨立地表示氫原子、碳數1～8之烷基、碳數5～8之環烷基、碳數6～12之烷基環烷基、碳數7～12之芳烷基或苯基；R⁴ 表示氫原子或碳數1～8之烷基；X表示單鍵、硫原子或由式：-CHR⁷ -(其中，R⁷ 表示氫原子、碳數1～8之烷基或碳數5～8之環烷基)所表示之基；A表示碳數1～8之伸烷基或由式：＊-COR⁸ -(其中，R⁸ 表示單鍵或碳數1～8之伸烷基；＊表示氧側之鍵結鍵)所表示之基；Y及Z之任一個表示羥基、碳數1～8之烷氧基或碳數7～12之芳烷氧基，另一個表示氫原子或碳數1～8之烷基)。 於通式(6)中，R² 、R³ 、R⁵ 及R⁶ 分別獨立地表示氫原子、碳數1～8之烷基、碳數5～8之環烷基、碳數6～12之烷基環烷基、碳數7～12之芳烷基或苯基。 其中，作為碳數1～8之烷基，例如可列舉甲基、乙基、正丙基、異丙基、正丁基、異丁基、第二丁基、第三丁基、第三戊基、異辛基、第三辛基、2-乙基己基等。作為碳數5～8之環烷基，例如可列舉環戊基、環己基、環庚基、環辛基等。作為碳數6～12之烷基環烷基，例如可列舉1-甲基環戊基、1-甲基環己基、1-甲基-4-異丙基環己基等。作為碳數7～12之芳烷基，例如可列舉苄基、α-甲基苄基、α,α-二甲基苄基等。 上述R² 、R³ 及R⁵ 較佳係分別獨立為碳數1～8之烷基、碳數5～8之環烷基或碳數6～12之烷基環烷基。更佳係R² 及R⁵ 分別獨立為第三丁基、第三戊基、第三辛基等之第三烷基、環己基或1-甲基環己基。特佳係R³ 為甲基、乙基、正丙基、異丙基、正丁基、異丁基、第二丁基、第三丁基、第三戊基等之碳數1～5之烷基，更佳為甲基、第三丁基或第三戊基。 上述R⁶ 較佳係氫原子、碳數1～8之烷基或碳數5～8之環烷基，更佳為氫原子、甲基、乙基、正丙基、異丙基、正丁基、異丁基、第二丁基、第三丁基、第三戊基等碳數1～5之烷基。 於通式(6)中，R⁴ 表示氫原子或碳數1～8之烷基。作為碳數1～8之烷基，例如可列舉於上述R² 、R³ 、R⁵ 及R⁶ 之說明中所例示之烷基。尤其，較佳係R⁴ 為氫原子或碳數1～5之烷基，更佳為氫原子或甲基。 於通式(6)中，X表示單鍵、硫原子或以式：-CHR⁷ -所表示之基。其中，式：-CHR⁷ -中之R⁷ 表示氫原子、碳數1～8之烷基或碳數5～8之環烷基。作為碳數1～8之烷基及碳數5～8之環烷基，例如可列舉分別於上述R² 、R³ 、R⁵ 及R⁶ 之說明中所例示之烷基及環烷基。尤其，較佳係X為藉由單鍵、亞甲基、或甲基、乙基、正丙基、異丙基、正丁基、異丁基、第三丁基等取代之亞甲基，更佳為單鍵。 於通式(6)中，A表示碳數1～8之伸烷基或以式：＊-COR⁸ -表示之基。作為碳數1～8之伸烷基，例如可列舉亞甲基、伸乙基、伸丙基、伸丁基、五亞甲基、六亞甲基、八亞甲基、2,2-二甲基-1,3-伸丙基等，較佳為伸丙基。又，式：＊-COR⁸ -中之R⁸ 表示單鍵或碳數1～8之伸烷基。作為表示R⁸ 之碳數1～8之伸烷基，例如可列舉於上述A之說明中所例示之伸烷基。較佳係R⁸ 為單鍵或伸乙基。又，式：＊-COR⁸ -中之＊係氧側之鍵結鍵，表示羰基與亞磷酸酯基之氧原子相結合。 於通式(6)中，Y及Z之任一個表示羥基、碳數1～8之烷氧基或碳數7～12之芳烷氧基，另一個表示氫原子或碳數1～8之烷基。作為碳數1～8之烷氧基，例如可列舉甲氧基、乙氧基、丙氧基、第三丁氧基、戊氧基等。作為碳數7～12之芳烷氧基，例如可列舉苄氧基、α-甲基苄氧基、α,α-二甲基苄氧基等。作為碳數1～8之烷基，例如，可列舉於上述R² 、R³ 、R⁵ 及R⁶ 之說明中所例示之烷基。 作為以通式(6)表示之化合物，例如可列舉2,4,8,10-四-第三丁基-6-〔3-(3-甲基-4-羥基-5-第三丁基苯基)丙氧基〕二苯并〔d,f〕〔1,3,2〕二氧雜磷雜環庚三烯(dioxaphosphepin)、6-[3-(3,5-二-第三丁基-4-羥基苯基)丙氧基]-2,4,8,10-四-第三丁基二苯并[d,f][1,3,2]二氧雜磷雜環庚三烯、6-[3-(3,5-二-第三丁基-4-羥基苯基)丙氧基]-4,8-二-第三丁基-2,10-二甲基-12H-二苯并[d,g][1,3,2]二氧磷雜八環、6-[3-(3,5-二-第三丁基-4-羥基苯基)丙醯氧基]-4,8-二-第三丁基-2,10-二甲基-12H-二苯并[d,g][1,3,2]二氧磷雜八環等。該等之中，尤其於要求光學特性之領域，於使用所獲得之聚碳酸酯樹脂組成物之情形時，較佳為2,4,8,10-四-第三丁基-6-〔3-(3-甲基-4-羥基-5-第三丁基苯基)丙氧基〕二苯并〔d,f〕〔1,3,2〕二氧雜磷雜環庚三烯，例如，能夠商業性地獲得住友化學(股)製造之Sumilizer GP(「Sumilizer」為註冊商標)。 作為上述亞磷酸酯系化合物(C)，除了由上述通式(5)表示之化合物及由上述通式(6)表示之化合物之外，例如可適合使用以通式(7)表示之化合物。 [化3]

(式中，R⁹ 及R¹⁰ 分別獨立地表示碳數1～20之烷基或亦可藉由烷基取代之芳基，b及c分別獨立地表示0～3之整數)。 作為通式(7)所表示之化合物，例如，能夠商業性地獲得ADEKA(股)製造之Adekastab PEP-36(「Adekastab」為註冊商標)。 亞磷酸酯系化合物(C)之量係相對於聚碳酸酯樹脂(A)100重量份，為0.005～1.0重量份，較佳為0.01～0.5重量份，更佳為0.02～0.1重量份。於亞磷酸酯系化合物(C)之量未滿0.005重量份之情形時，透光率及色調之提昇效果不充分。相反地，於亞磷酸酯系化合物(C)之量超過1.0重量份之情形時，透光率及色調之提昇效果亦不充分。 除了以上之成分以外，對於實施形態之聚碳酸酯樹脂組成物，例如可將屬於進一步提昇所得之聚碳酸酯樹脂組成物之耐候性之成分的紫外線吸附劑，配合使聚碳酸酯樹脂組成物成形而獲得之成形品之用途而適當使用。 作為紫外線吸附劑，能夠單獨或者組合2種以上使用例如苯并三唑系化合物、三

系化合物、二苯甲酮系化合物、草酸醯替苯胺系化合物等之通常調配於聚碳酸酯樹脂之紫外線吸附劑。 作為苯并三唑系化合物，例如可列舉2-(2-羥基-5-第三辛基苯基)苯并三唑、2-(3-第三丁基-2-羥基-5-甲苯基)-5-氯基-2H-苯并三唑、2-(3,5-二-第三戊基-2-羥苯基)-2H-苯并三唑、2-(2H-苯并三唑-2-基)-4-甲基-6-(3,4,5,6-四氫鄰苯二甲醯亞胺基甲基)酚、2-(2-羥基-4-辛氧基苯基)-2H-苯并三唑、2-(2-羥基-5-第三辛氧基苯基)-2H-苯并三唑、2-[2'-羥基-3,5-二(1,1-二甲基苄基)苯基]-2H-苯并三唑、2,2'-亞甲基雙[6-(2H-苯并三唑-2-基)4-(1,1,3,3-四甲基丁基)酚]等。其中，尤其2-(2-羥基-5-第三辛基苯基)苯并三唑等較為合適，例如，能夠商業性地獲取BASF公司製造之TINUVIN 329(TINUVIN為註冊商標)，Shipro Kasei(股)製造之SEESORB 709、Chemipro Kasei(股)製造之KEMISORB 79等。 作為三

系化合物，例如可列舉2,4-二苯基-6-(2-羥基苯基-4-己氧基苯基)1,3,5-三

、2-[4,6-雙(2,4-二甲基苯基)-1,3,5-三

-2-基]-5-(辛氧基)酚、2-(4,6-二苯基-1-3,5-三

-2-基-5-[(己基)氧基]酚等，例如，能夠商業性地獲取BASF公司製造之TINUVIN 1577等。 作為草醯替苯胺系化合物，例如，能夠商業性地獲取Clariant Japan(股)製造之Sanduvor VSU等。 作為二苯甲酮系化合物，例如可列舉2,4-二羥基二苯甲酮、2-羥基-4-正辛氧基二苯甲酮等。 紫外線吸附劑之量係相對於聚碳酸酯樹脂(A)100重量份為0～1.0重量份，較佳為0～0.5重量份。於紫外線吸附劑(D)之量超過1.0重量份之情形時，有所獲得之聚碳酸酯樹脂組成物之初始之色調下降之虞。又，尤其於紫外線吸附劑(D)之量為0.1重量份以上之情形時，進一步提昇聚碳酸酯樹脂組成物之耐候性之效果大幅度奏效。 進而，於實施形態之聚碳酸酯樹脂組成物中，於不損及本發明中之效果之範圍內，例如，亦可適當調配其他之抗氧化劑、著色劑、脫模劑、軟化劑、抗靜電劑、衝擊性改良劑等各種添加劑、聚碳酸酯樹脂(A)以外之聚合物等。 聚碳酸酯樹脂組成物之製造方法並無特別限制，可舉例如針對聚碳酸酯樹脂(A)、熔融黏度調整劑(B)、及亞磷酸酯系化合物(C)、視需要之上述各種添加劑或聚碳酸酯樹脂(A)以外之聚合物等，對各成分之種類及用量進行適當調整，將該等藉由例如滾筒、帶式混合機等眾所周知之混合機進行混合之方法，或藉由擠出機進行熔融混練之方法。藉由該等之方法，能夠容易獲得聚碳酸酯樹脂組成物之顆粒。 如上述而獲得之聚碳酸酯樹脂組成物之顆粒之形狀及尺寸並無特別限制，為一般之樹脂顆粒所具有之形狀及尺寸即可。例如，作為顆粒之形狀，可列舉橢圓柱狀、圓柱狀等。作為顆粒之尺寸，較佳係長度為2～8mm左右，於橢圓柱狀之情形時，較佳係截面橢圓之長徑為2～8mm左右，短徑為1～4mm左右，於圓柱狀之情形時，較佳係截面圓之直徑為1～6mm左右。再者，可使所獲得之每個顆粒均為此種尺寸，或形成顆粒集合體之全部顆粒為此種尺寸，或顆粒集合體之平均值為此種尺寸，並無特別限制。 本發明之聚碳酸酯樹脂組成物係使如上述所獲得之聚碳酸酯樹脂組成物成形而獲得者。 本發明之聚碳酸酯樹脂組成物之製造方法並無特別限制，例如可列舉藉由眾所周知之射出成形法、壓縮成形法等而使聚碳酸酯樹脂組成物成形之方法。 如以上所示，作為本發明之例示，對實施形態進行說明。然而，本發明中之技術並不限定於此，亦能應用於適宜進行變更、取代、加成、省略等實施形態。 [實施例] 以下，藉由實施例對本發明進行具體說明，但是本發明並不限定於該等之實施例。再者，如無特殊說明，「份」及「%」分別為重量標準。 使用以下者作為原料。 1.聚碳酸酯樹脂(A) 由聯苯A與碳醯氯合成而得之聚碳酸酯樹脂Calibre200-80(商品名稱，Sumika Styron Polycarbonate(股)製造、「Calibre」為Styron Europe GMBH之註冊商標，黏度平均分子量：15000，以下稱作「PC」)。 2.熔融黏度調整劑(B)(下式之聚醚衍生物)： 2-1.包含四亞甲基二醇單元與2-甲基四亞甲基二醇單元之改質乙二醇(聚醚衍生物)： HO-(CH₂ CH₂ CH₂ CH₂ O)₂₂ (CH₂ CH₂ CH(CH₃ )CH₂ O)₅ -H PTG-L2000 (商品名稱，保土谷化學工業(股)製造，重量平均分子量：2000，以下稱作「化合物B1」)。 2-2.包含四亞甲基二醇單元與1-乙基乙二醇單元之改質乙二醇(聚醚衍生物)： HO-(CH₂ CH₂ CH₂ CH₂ O)₂₄ (CH₂ CH(C₂ H₅ )O)₁₃ -H DCD-2000 (商品名稱，日油(股)製造，重量平均分子量：2000，以下「稱作化合物B2」)。 2-3.包含乙二醇單元與丙二醇單元之改質乙二醇(聚醚衍生物)： C₄ H₉ O-(CH₂ CH₂ O)₃₀ (CH₂ CH(CH₃ )O)₃₀ -H Unilube 50MB-72 (商品名稱，日油(股)製造，重量平均分子量：3000，以下稱作「化合物B3」)。 2-4.包含乙二醇單元與丙二醇單元之改質乙二醇(聚醚衍生物)： C₄ H₉ O-(CH₂ CH₂ O)₂₁ (CH₂ CH(CH₃ )O)₁₄ -H Unilube 60MB-26I (商品名稱，日油(股)製造，重量平均分子量：1700，以下稱作「化合物B4」)。 2-5.包含乙二醇單元與丙二醇單元之改質乙二醇(聚醚衍生物)： HO-(CH₂ CH₂ O)₁₇ (CH₂ CH(CH₃ )O)₁₇ -H Unilube50DE-25 (商品名稱，日油((股)製造，重量平均分子量：1750，以下稱作「化合物B5」)。 3.亞磷酸酯系化合物(C)： 3-1.由以下之式表示之參(2,4-二-第三丁基苯基)亞磷酸酯

Irgafos 168 (商品名稱，BASF公司製造，以下稱作「化合物C1」)。 3-2.由以下之式表示之2,4,8,10-四-第三丁基-6-〔3-(3-甲基-4-羥基-5-第三丁基苯基)丙氧基〕二苯并〔d,f〕〔1,3,2〕二氧雜磷雜環庚三烯

Sumilizer GP (商品名稱，住友化學(股)製造，以下稱作「化合物C2」)。 3-3.由以下之式表示之3,9-雙(2,6-二-第三丁基-4-甲基苯氧基)-2,4,8,10-四氧雜-3,9-二磷雜螺[5,5]十一烷

Adekastab PEP-36 (商品名稱，ADEKA(股)製造，以下稱作「化合物C3」)。 (實施例1～17及比較例1～6) 將上述各原料按照如表1及表2所示之比例一併投入滾筒中，進行10分鐘之乾式混合後，使用雙軸擠出機(日本製鋼所(股)製造，TEX 30α)，於熔融溫度220℃下進行熔融混練，獲得聚碳酸酯樹脂組成物之顆粒。再者，於實施例及比較例中所獲得之顆粒大致為橢圓柱狀，包含100個顆粒之集合體分別長度之平均值為約5.1mm～約5.4mm，截面橢圓之長徑之平均值為約4.1mm～約4.3mm，短徑之平均值為約2.2mm～約2.3mm。 使用所獲得之顆粒，按照以下之方法，製作各評價用試片而供評價使用。將其結果示於表1及表2。 (熔融黏度之測定方法) 將所獲得之顆粒及聚碳酸酯樹脂(A)之顆粒於120℃下乾燥4小時以上之後，使用毛細管流變儀(島津製作所(股)製造、流量測試法CFT-500)，於測定溫度220℃下，於剪切速度1sec^-1 ～100sec^-1 之範圍內測定熔融黏度。將剪切速度10sec^-1 中之聚碳酸酯樹脂組成物之熔融黏度設為η1，聚碳酸酯樹脂(A)之熔融黏度設為η2。 (試片之製作方法) 將所獲得之顆粒於120℃下乾燥4小時以上之後，使用射出成形機(FANUC(股)製造，ROBOSHOT S2000il00A)，於成形溫度360℃、模具溫度80℃下，製作由JIS K 7139「塑料-試片」規定之多用途試片A型(全長168mm×厚度4mm)。切削該試片之端面，針對切削端面，使用樹脂板端面鏡面機(MEGALO TECHNICA(股)製造，Pla-Beauty PB-500)進行鏡面加工。 (累計透過率之評價方法) 於分光光度計(日立製作所(股)製造，UH4150)設置長光程測定配套裝置，使用50W鹵素燈作為光源，於使用光源前遮罩5.6mm×2.8mm、試樣前遮罩6.0mm×2.8mm之狀態下，針對試片之全長方向，於波長380～780nm之區域內對每1nm之試片各自之分光透過率進行測定。累計測定之分光透過率，藉由對十位數進行四捨五入，求出各自之累計透過率。再者，累計透過率為30000以上則設為良好(表中，以○表示)，未滿30000則設為不良(表中，以×表示)。 (黃度之評價方法) 根據於上述累計透過率之評價方法中所測定之分光透過率，使用標準光源D65，藉由10度視野求出各自之黃度。再者，黃度為20以下則設為良好(表中，以○表示)，若超過20則設為不良(表中，以×表示)。

實施例1～18之聚碳酸酯樹脂組成物係於聚碳酸酯樹脂(A)中，將特定之聚醚衍生物等之熔融黏度調整劑(B)與亞磷酸酯系化合物(C)分別按照特定之比率調配而成者。因而，自該聚碳酸酯樹脂組成物而成形之試片之累計透過率較高，且黃度較小。 如此，實施例1～18之聚碳酸酯樹脂組成物未損及聚碳酸酯樹脂(A)原本所具有之耐熱性，可見區域中之透光率較高，而且於高溫下進行成形加工之情形時，透光率亦優異。並且，使該種聚碳酸酯樹脂組成物成形而得之成形品之黃度較小，色調優異，且於高溫下進行成形加工之情形時色調亦優異。 與此相對，比較例1之聚碳酸酯樹脂組成物由於特定之聚醚衍生物等之熔融黏度調整劑(化合物B1)之量較少，故而累計透過率較低，且黃度較大。如此，使比較例1之聚碳酸酯樹脂組成物成形而得之成形品之亮度及色調較差。 比較例2之聚碳酸酯樹脂組成物由於特定之熔融黏度調整劑(化合物B1)之量較多，故而累計透過率較低，且黃度較大。如此，使比較例2之聚碳酸酯樹脂組成物成形而得之成形品之亮度及色調較差。 比較例3之聚碳酸酯樹脂組成物由於亞磷酸酯系化合物(C)之量較少，故而試片之黃度較大。如此，使比較例3之聚碳酸酯樹脂組成物成形而得之成形品之色調較差。 比較例4之聚碳酸酯樹脂組成物由於亞磷酸酯系化合物(C)之量較多，故而累計透過率較低，且黃度較大。如此，使比較例4之聚碳酸酯樹脂組成物成形而得之成形品之亮度及色調較差。 比較例5之聚碳酸酯樹脂組成物由於特定之熔融黏度調整劑(化合物B5)之量較少，故而累計透過率較低，且黃度較大。如此，使比較例5之聚碳酸酯樹脂組成物成形而得之成形品之亮度及色調較差。 比較例6之聚碳酸酯樹脂組成物由於特定之熔融黏度調整劑(化合物B5)之量較多，故而累計透過率較低，且黃度較大。如此，使比較例5之聚碳酸酯樹脂組成物成形而得之成形品之亮度及色調較差。 如以上所示，以本發明中之技術之例示對實施形態進行了說明。因此，提供了詳細之說明。 因此，於詳細之說明所記載之構成要素之中，不僅包含用於解決問題所必須之構成要素，為了例示上述技術，亦可包含用於解決問題而非必須之構成要素。因此，不應該因為將該等之非必須之構成要素記載於詳細之說明，而直接將該等之非必須之構成要素認定為必須之構成要素。 又，上述之實施形態係用於例示本發明中之技術者，故而於專利申請範圍或者其均勻之範圍中能夠進行各種變更、取代、附加、省略等。 (產業上之可利用性) 本發明之聚碳酸酯樹脂組成物係不損及聚碳酸酯樹脂原本所具有之耐熱性、機械強度等之特性，熱穩定性以及耐候性優異，且於高溫下進行成形加工之情形時，透光率亦優異者。因此，例如即使為厚度0.3mm左右之薄型之導光板，色調變化而外觀下降、或者經由高溫成形而樹脂本身劣化之情況亦較少，工業上之利用價值極高。Hereinafter, the embodiment will be described in detail. However, there are cases where unnecessary detailed explanations are omitted. For example, there may be cases where detailed descriptions of well-known matters are omitted or substantially repeated descriptions of the same configuration. It is to avoid the following descriptions from becoming unnecessary redundant and easy to be understood by practitioners. In addition, the inventors and others provide the following explanations in order to fully understand the present invention, and it is not intended to limit the main contents described in the patent application scope by these. The polycarbonate resin composition used in the present invention is prepared by blending a polycarbonate resin (A) and a melt viscosity adjuster (B). In addition, in the polycarbonate resin composition used in the present invention, other components may be blended as necessary. The polycarbonate resin (A) used in the present invention is obtained by the phosgene method of reacting various dihydroxydiaryl compounds with carbamide, or the carbonic acid such as dihydroxydiaryl compounds and diphenyl carbonate A polymer obtained by the transesterification method of ester reaction. As a representative example, a polycarbonate resin produced from 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) can be cited. As the dihydroxydiaryl compound, in addition to bisphenol A, for example, bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis( 4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, bis(4-hydroxyphenyl)phenylmethane, 2,2-bis(4-hydroxyphenyl-3- Methylphenyl) propane, 1,1-bis(4-hydroxy-3-t-butylphenyl)propane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 2,2- Bis(hydroxyaryl)alkanes such as bis(4-hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane; 1, Bis(hydroxyaryl)cycloalkanes such as 1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane; 4,4'-dihydroxydiphenyl Dihydroxydiaryl ethers such as alkyl ether, 4,4dihydroxy-3,3'-dimethyldiphenyl ether; dihydroxydiaryl sulfide such as 4,4'-dihydroxydiphenyl sulfide Species; 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide and other dihydroxydiaryl sulfoxide; 4, 4'-dihydroxy diphenyl satin, 4,4'-dihydroxy-3, 3 dimethyl diphenyl satin and other dihydroxy diaryl satins, these can be used alone or in combination of two or more types. In addition to these, piper

, Dipiperidyl hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, etc. Furthermore, the above dihydroxydiaryl compound and, for example, a trivalent or higher phenol compound shown below may be used in combination. Examples of the above-mentioned trivalent or higher phenol compounds include resorcinol, 4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)-heptene, and 2,4,6- Dimethyl-2,4,6-tri-(4-hydroxyphenyl)-heptane, 1,3,5-tri-(4-hydroxyphenyl)-benzene, 1,1,1-tri-( 4-hydroxyphenyl)-ethane and 2,2-bis-[4,4-(4,4dihydroxydiphenyl)-cyclohexyl]-propane, etc. The viscosity average molecular weight of the polycarbonate resin (A) is preferably 10,000 to 100,000, and more preferably 12,000 to 30,000. In addition, when manufacturing such a polycarbonate resin (A), a molecular weight modifier, a catalyst, etc. can be used as needed. The melt viscosity modifier (B) used in the present invention means that when the polycarbonate resin composition is molded, the shear viscosity (shear viscosity) of the polycarbonate resin is reduced by acting like a certain kind of lubricant ), to suppress the generation of unnecessary shear heat, even with the role of reducing or suppressing heat in polycarbonate resin. As the melt viscosity adjuster (B), if the melt viscosity at the measurement temperature of 220° C. and the shear rate of 10 sec ^-1 is η, the melt viscosity of the polycarbonate resin composition η1 and the polycarbonate resin can be used (A) The ratio of the melt viscosity η2 η1/η2 is adjusted so that it satisfies 0.45≦η1/η2≦0.95, and is not particularly limited. Typically, the polymer represented by the following general formula (1) can be cited Ether derivatives, etc. Other examples include silicone-based compounds, glycerin-based compounds, and pentaerythritol-based compounds. General formula (1): RO-(XO)m(YO)nR' (1) (wherein R and R'independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms; X represents a carbon number of 2 to 2) 4 alkylene; Y represents branched alkylene having 3 to 5 carbon atoms; m and n independently represent integers of 3 to 60; m+n represents integers of 8 to 90). As the polyether derivative represented by the general formula (1), it is possible to commercially obtain modified ethylene glycol containing tetramethylene glycol units and 1-ethyl ethylene glycol units (for example, HO-(CH ₂ CH ₂ CH ₂ CH ₂ O) ₂₄ (CH ₂ CH(C ₂ H ₅ )O) ₁₃ -H, etc.), for example, DCD-2000 (weight average molecular weight 2000) manufactured by NOF Corporation. The weight average molecular weight of the polyether derivative represented by the general formula (1) is preferably 1,000 to 4,000. Also, as the polyether derivative, among the polyether derivatives represented by the general formula (1), the polyether derivatives represented by the following general formula (2), general formula (3) or general formula (4) are good. General formula (2): HO-(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH ₂ CH(CH ₃ )CH ₂ O)nH (2) (In the formula, m and n independently represent 3 ～60 integer; m+n means 8～90 integer). Examples of the polyether derivative represented by the general formula (2) include modified ethylene glycol containing tetramethylene glycol units and 2-methyltetramethylene glycol units (for example, HO-(CH ₂ CH ₂ CH ₂ CH ₂ O) ₂₂ (CH ₂ CH ₂ CH(CH ₃ )CH ₂ O) ₅ -H, etc.), for example, PTG-L1000 (made by Hodogaya Chemical Industry Co., Ltd.) can be obtained commercially Weight average molecular weight 1000), PTG-L2000 (weight average molecular weight 2000), or PTG-L3000 (weight average molecular weight 3000), etc. It is preferable that the polyether derivative represented by the general formula (2) has a weight average molecular weight of 1,000 to 4,000. General formula (3): C ₄ H ₉ O-(CH ₂ CH ₂ O)m(CH ₂ CH(CH ₃ )O)nH (3) (In the formula, m and n independently represent integers of 3-60 ; M+n represents an integer from 8 to 90). The polyether derivative represented by the general formula (3) is preferably modified ethylene glycol containing ethylene glycol units and propylene glycol units (for example, C ₄ H ₉ O-(CH ₂ CH ₂ O) ₂₁ (CH ₂ CH(CH ₃ )O) ₁₄ -H or C ₄ H ₉ O-(CH ₂ CH ₂ O) ₃₀ (CH ₂ CH(CH ₃ )O) ₃₀ -H, etc.), for example, Unilube can be obtained commercially 60MB-26I (weight average molecular weight 1700) or Unilube 50MB-72 (weight average molecular weight 3000) and so on. It is preferable that the polyether derivative represented by the general formula (3) has a weight average molecular weight of 1,000 to 4,000. General formula (4): HO-(CH ₂ CH ₂ O)m(CH ₂ CH(CH ₃ )O)nH (4) (wherein m and n independently represent integers of 3 to 60; m+n Indicates an integer from 8 to 90). As the polyether derivative represented by the general formula (4), modified ethylene glycol containing ethylene glycol units and propylene glycol units (for example, HO-(CH ₂ CH ₂ O) ₁₇ (CH ₂ CH( CH ₃ )O) ₁₇ -H), for example, Unilube 5ODE-25 (weight average molecular weight 1750) can be obtained commercially. It is preferable that the polyether derivative represented by the general formula (4) has a weight average molecular weight of 1,000 to 4,000. So far, although attempts have been made to add linear polyoxyalkylene glycols to improve the light transmittance of polycarbonate resins, the heat resistance of the polyoxyalkylene glycols is insufficient, so the blending of the polyoxyalkylene glycols at high temperatures When the polycarbonate resin composition obtained by polyoxyalkylene glycol is molded, the brightness or light transmittance of the molded product decreases. On the other hand, melt viscosity modifiers such as polyether derivatives represented by the above general formula (1) are 2-functional random copolymers that have high heat resistance and are formulated at the high temperature by the general formula ( 1) The molded product obtained by molding the polycarbonate resin composition of the specified polyether derivative has high brightness or light transmittance. In addition, since the melt viscosity adjuster (B) used in the present invention has moderate lipophilicity and excellent compatibility with the polycarbonate resin (A), the melt viscosity adjuster (B) is formulated from The transparency of the molded product obtained from the obtained polycarbonate resin composition is also improved. The weight average molecular weight of the polyether derivative used for the melt viscosity modifier (B) is preferably 1,000 to 4,000, and more preferably 2,000 to 3,000. In the case where the weight average molecular weight of the polyether derivative is 1000 to 4000, a sufficient improvement effect of the light transmittance can be expected, and the atomization rate does not increase, and there is no possibility that the light transmittance decreases. 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 with respect to 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 the light transmittance and color tone is insufficient. Conversely, when the amount of the polyether derivative exceeds 3.0 parts by weight, the fogging rate increases and the light transmittance decreases. The melt viscosity modifier (B) used in the present invention means that when the polycarbonate resin composition is molded, the shear viscosity (shear viscosity) of the polycarbonate resin is reduced by acting like a certain kind of lubricant ), to suppress the generation of unnecessary shear heat, even with the role of reducing or suppressing heat in polycarbonate resin. In the polycarbonate resin composition of the present invention, a phosphite-based compound (C) is blended together with a melt viscosity adjuster (B) such as a specific polyether derivative. In this way, by simultaneously blending the melt viscosity modifier (B) and the phosphite compound (C), it is possible to prevent the shear heat of the polycarbonate resin composition from being generated as much as possible, without damaging the original polycarbonate resin (A) The heat resistance, mechanical strength and other characteristics of the polycarbonate resin composition can improve the light transmittance even in the case of high temperature molding. As the phosphite compound (C) used in the present invention, for example, a compound represented by the following general formula (5) is particularly suitable.

(In the formula, R ¹ represents an alkyl group having 1 to 20 carbon atoms, and a represents an integer of 0 to 3) In the above general formula (5), R ¹ is an alkyl group having 1 to 20 carbon atoms, and more preferably C1-C10 alkyl. Examples of the compound represented by the general formula (5) include triphenyl phosphite, tricresyl phosphite, ginseng (2,4-di-tert-butylphenyl) phosphite, and ginseng phosphite (nonyl Phenyl ester) etc. Among these, especially (2,4-di-tert-butylphenyl) phosphite is more suitable, for example, Irgafos168 manufactured by BASF ("Irgafos" is registered by BASF Societas-Europeae can be obtained commercially trademark). Examples of the phosphite-based compound include compounds represented by the following general formula (6) in addition to the compounds represented by the above general formula (5). [Chem 2]

(In the formula, R ² , R ³ , R ⁵ and R ⁶ each independently represent a hydrogen atom, a C 1-8 alkyl group, a C 5-8 cycloalkyl group, and a C 6-12 alkyl ring Alkyl group, aralkyl group having 7 to 12 carbon atoms or phenyl group; R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; X represents a single bond, a sulfur atom or is represented by the formula: -CHR ⁷ -(wherein, R ⁷ represents 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 by the formula: *-COR ⁸ -( Where R ⁸ represents a single bond or an alkylene group having 1 to 8 carbon atoms; * represents a group represented by a bonding bond on the oxygen side); either of Y and Z represents a hydroxyl group, and 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), R ² , R ³ , R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, and 6 to 12 carbon atoms Alkylcycloalkyl, aralkyl having 7 to 12 carbons or phenyl. Among them, examples of the alkyl group having 1 to 8 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, second butyl, third butyl, and third pentane. Group, iso-octyl group, third octyl group, 2-ethylhexyl group, etc. Examples of the cycloalkyl group having 5 to 8 carbon atoms include cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl and the like. Examples of the alkylcycloalkyl having 6 to 12 carbon atoms include 1-methylcyclopentyl, 1-methylcyclohexyl, 1-methyl-4-isopropylcyclohexyl and the like. Examples of the aralkyl group having 7 to 12 carbon atoms include benzyl, α-methylbenzyl, α,α-dimethylbenzyl and the like. Preferably, R ² , R ³ and R ⁵ are independently C 1-8 alkyl, C 5-8 cycloalkyl or C6-12 alkyl cycloalkyl. More preferably, R ² and R ⁵ are independently a third alkyl group such as a third butyl group, a third pentyl group, a third octyl group, a cyclohexyl group, or a 1-methylcyclohexyl group. Particularly good R ³ is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, second butyl, third butyl, third pentyl, etc. The alkyl group is more preferably a methyl group, a third butyl group or a third pentyl group. The above R ^{6 is} preferably a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms, more preferably a hydrogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group The alkyl group having 1 to 5 carbons such as a group, isobutyl group, second butyl group, third butyl group, and third pentyl group. In the general formula (6), R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms include the alkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ above. In particular, R ⁴ is preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and more preferably a hydrogen atom or a methyl group. In the general formula (6), X represents a single bond, a sulfur atom, or a group represented by the formula: -CHR ⁷ -. Wherein, R ⁷ in the formula: -CHR ⁷ -represents 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 the alkyl groups and cycloalkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ above. In particular, X is preferably a methylene group substituted with a single bond, methylene group, or methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, tertiary butyl group, etc., More preferably, it is a single key. In the general formula (6), A represents an alkylene group having 1 to 8 carbon atoms or a group represented by the formula: *-COR ⁸ -. Examples of the alkylene group having 1 to 8 carbon atoms include methylene, ethylidene, propylidene, butylidene, pentamethylene, hexamethylene, octamethylene, and 2,2-diethylene. Methyl-1,3-propylene etc., preferably propylene. In addition, R ⁸ in the formula: *-COR ⁸ -represents a single bond or an alkylene group having 1 to 8 carbon atoms. Examples of the alkylene group having 1 to 8 carbon atoms representing R ⁸ include the alkylene groups exemplified in the description of A above. Preferably, R ⁸ is a single bond or ethylidene. In addition, the formula: * in COR ⁸ -is a bonding bond on the oxygen side, which means that the carbonyl group is bonded to the oxygen atom of the phosphite group. In the general formula (6), any one of Y and Z represents a hydroxyl group, a C 1-8 alkoxy group or a C 7-12 aralkoxy group, and the other represents a hydrogen atom or a C 1-8 alkyl. Examples of the alkoxy group having 1 to 8 carbon atoms include methoxy, ethoxy, propoxy, third butoxy, and pentoxy. Examples of the aralkyloxy group having 7 to 12 carbon atoms include benzyloxy, α-methylbenzyloxy, α,α-dimethylbenzyloxy and the like. Examples of the alkyl group having 1 to 8 carbon atoms include the alkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ above. As the compound represented by the general formula (6), for example, 2,4,8,10-tetra-tert-butyl-6-[3-(3-methyl-4-hydroxy-5-tert-butyl Phenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphosphepin, 6-[3-(3,5-di-third-butane 4-hydroxyphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphorane Ene, 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]dioxaphosphorane, 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]dioxaphosphorane, etc. Among these, especially in the field requiring optical properties, when using the obtained polycarbonate resin composition, it is preferably 2,4,8,10-tetra-tert-butyl-6-[3 -(3-methyl-4-hydroxy-5-t-butylphenyl)propoxy]dibenzo[d,f][1,3,2]dioxaphospholane, for example , Can commercially obtain Sumilizer GP manufactured by Sumitomo Chemical Co., Ltd. ("Sumilizer" is a registered trademark). As the phosphite-based compound (C), in addition to the compound represented by the general formula (5) and the compound represented by the general formula (6), for example, a compound represented by the general formula (7) can be suitably used. [Chemical 3]

(In the formula, R ⁹ and R ¹⁰ each independently represent 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, Adekastab PEP-36 ("Adekastab" is a registered trademark) manufactured by ADEKA Corporation is commercially available. The amount of the phosphite 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 with respect to 100 parts by weight of the polycarbonate resin (A). When the amount of the phosphite-based compound (C) is less than 0.005 parts by weight, the effect of improving the light transmittance and color tone is insufficient. Conversely, when the amount of the phosphite-based compound (C) exceeds 1.0 part by weight, the effect of improving light transmittance and color tone is insufficient. In addition to the above components, for the polycarbonate resin composition of the embodiment, for example, an ultraviolet absorbent that is a component that further improves the weather resistance of the polycarbonate resin composition obtained can be blended to form the polycarbonate resin composition The obtained molded product is used appropriately. As the ultraviolet absorbent, for example, a benzotriazole-based compound, three

Compound, benzophenone compound, oxanilate aniline compound, etc. are usually formulated in the ultraviolet absorbent of polycarbonate resin. Examples of the benzotriazole-based compound include 2-(2-hydroxy-5-third-octylphenyl)benzotriazole and 2-(3-third-butyl-2-hydroxy-5-tolyl )-5-chloro-2H-benzotriazole, 2-(3,5-di-third pentyl-2-hydroxyphenyl)-2H-benzotriazole, 2-(2H-benzotriazole Oxazol-2-yl)-4-methyl-6-(3,4,5,6-tetrahydrophthalimidomethyl)phenol, 2-(2-hydroxy-4-octyloxy Phenyl)-2H-benzotriazole, 2-(2-hydroxy-5-third octyloxyphenyl)-2H-benzotriazole, 2-(2'-hydroxy-3,5-bis( 1,1-dimethylbenzyl)phenyl]-2H-benzotriazole, 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)4-(1, 1,3,3-tetramethylbutyl)phenol] etc. Among them, 2-(2-hydroxy-5-third octylphenyl) benzotriazole is particularly suitable. For example, TINUVIN 329 (TINUVIN is a registered trademark) manufactured by BASF can be obtained commercially, and Shipro Kasei ( Shares) manufactured by SEESORB 709, Chemipro Kasei (shares) manufactured by KEMISORB 79 and so on. As three

Compound, for example, 2,4-diphenyl-6-(2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-tri

, 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-tri

-2-yl)-5-(octyloxy)phenol, 2-(4,6-diphenyl-1-3,5-tri

2-yl-5-[(hexyl)oxy]phenol, etc., for example, TINUVIN 1577 manufactured by BASF, etc. can be obtained commercially. As the oxanilide-based compound, for example, Sanduvor VSU manufactured by Clariant Japan Co., Ltd. and the like can be obtained commercially. Examples of the benzophenone-based compound include 2,4-dihydroxybenzophenone and 2-hydroxy-4-n-octyloxybenzophenone. The amount of the ultraviolet absorbing agent is 0 to 1.0 part by weight, preferably 0 to 0.5 part by weight with respect to 100 parts by weight of the polycarbonate resin (A). When the amount of the ultraviolet adsorbent (D) exceeds 1.0 part by weight, there is a possibility that the initial color tone of the polycarbonate resin composition obtained may decrease. Moreover, especially in the case where the amount of the ultraviolet absorbent (D) is 0.1 parts by weight or more, the effect of further improving the weather resistance of the polycarbonate resin composition is greatly effective. Furthermore, in the polycarbonate resin composition of the embodiment, other antioxidants, colorants, mold release agents, softeners, antistatic agents may be appropriately blended as long as the effects of the present invention are not impaired Agents, impact modifiers and other additives, polymers other than polycarbonate resin (A), etc. The production method of the polycarbonate resin composition is not particularly limited, and examples thereof include polycarbonate resin (A), melt viscosity modifier (B), and phosphite-based compound (C), and various additives as required. Or polymers other than polycarbonate resin (A), adjust the type and amount of each component appropriately, and mix these by a well-known mixer such as a roller or belt mixer, or by The method of melt-kneading the extruder. By these methods, the particles of the polycarbonate resin composition can be easily obtained. The shape and size of the particles of the polycarbonate resin composition obtained as described above are not particularly limited, and may be the shape and size of general resin particles. For example, as the shape of the particles, an elliptic cylindrical shape, a cylindrical shape, etc. may be mentioned. As the size of the particles, the length is preferably about 2 to 8 mm. In the case of an elliptical cylinder, the long diameter of the cross-section ellipse is preferably about 2 to 8 mm, and the short diameter is about 1 to 4 mm. In the case of a cylinder In this case, the diameter of the cross-section circle is preferably about 1 to 6 mm. Furthermore, each particle obtained can be of this size, or all the particles forming the aggregate of particles can be of this size, or the average value of the aggregate of particles can be of this size, and there is no particular limitation. 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 methods for molding the polycarbonate resin composition by well-known injection molding methods, compression molding methods, and the like. As described above, the embodiment will be described as an example of the present invention. However, the technology in the present invention is not limited to this, and can also be applied to an embodiment in which changes, substitutions, additions, omissions, etc. are suitable. [Examples] Hereinafter, the present invention will be specifically described by examples, but the present invention is not limited to these examples. Furthermore, unless otherwise specified, "parts" and "%" are weight standards. Use the following as raw materials. 1. Polycarbonate resin (A) Polycarbonate resin Calibre200-80 (trade name, manufactured by Sumika Styron Polycarbonate (share)) made from the synthesis of biphenyl A and carbamide chloride, "Calibre" is a registered trademark of Styron Europe GMBH , Average molecular weight of viscosity: 15000, hereinafter referred to as "PC"). 2. Melt viscosity modifier (B) (polyether derivative of the following formula): 2-1. Modified ethylene glycol containing tetramethylene glycol units and 2-methyltetramethylene glycol units ( Polyether derivatives): HO-(CH ₂ CH ₂ CH ₂ CH ₂ O) ₂₂ (CH ₂ CH ₂ CH(CH ₃ )CH ₂ O) ₅ -H PTG-L2000 (trade name, Hodogaya Chemical Industry Co., Ltd. ) Manufacturing, weight average molecular weight: 2000, hereinafter referred to as "compound B1"). 2-2. Modified ethylene glycol (polyether derivative) containing tetramethylene glycol units and 1-ethyl ethylene glycol units: HO-(CH ₂ CH ₂ CH ₂ CH ₂ O) ₂₄ (CH ₂ CH(C ₂ H ₅ )O) ₁₃ -H DCD-2000 (trade name, manufactured by NOF Corporation, weight average molecular weight: 2000, hereinafter referred to as "compound B2"). 2-3. Modified ethylene glycol (polyether derivative) containing ethylene glycol unit and propylene glycol unit: C ₄ H ₉ O-(CH ₂ CH ₂ O) ₃₀ (CH ₂ CH(CH ₃ )O) ₃₀ -H Unilube 50MB-72 (trade name, manufactured by NOF Corporation, weight average molecular weight: 3000, hereinafter referred to as "compound B3"). 2-4. Modified ethylene glycol (polyether derivative) containing ethylene glycol unit and propylene glycol unit: C ₄ H ₉ O-(CH ₂ CH ₂ O) ₂₁ (CH ₂ CH(CH ₃ )O) ₁₄ -H Unilube 60MB-26I (trade name, manufactured by NOF Corporation, weight average molecular weight: 1700, hereinafter referred to as "compound B4"). 2-5. Modified ethylene glycol (polyether derivative) containing ethylene glycol unit and propylene glycol unit: HO-(CH ₂ CH ₂ O) ₁₇ (CH ₂ CH(CH ₃ )O) ₁₇ -H Unilube50DE- 25 (trade name, manufactured by Nippon Oil Co., Ltd., weight-average molecular weight: 1750, hereinafter referred to as "compound B5"). 3. Phosphite-based compound (C): 3-1. Parameter represented by the following formula (2,4-di-tert-butylphenyl) phosphite

Irgafos 168 (trade name, manufactured by BASF Corporation, hereinafter referred to as "Compound C1"). 3-2. 2,4,8,10-tetra-tert-butyl-6-[3-(3-methyl-4-hydroxy-5-tert-butylphenyl)propane expressed by the following formula Oxy]dibenzo〔d,f〕〔1,3,2〕dioxaphosphorane

Sumilizer GP (trade name, manufactured by 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, represented by the following formula 9-Diphosphaspiro[5,5]undecane

Adekastab 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 into a drum at the ratios shown in Table 1 and Table 2 together, and after 10 minutes of dry mixing, a twin-screw extruder (Japan Manufactured by a steel mill (unit), TEX 30α), melt-kneaded at a melting temperature of 220°C to obtain pellets of a polycarbonate resin composition. In addition, the particles obtained in the examples and comparative examples are substantially elliptical cylindrical, and the average length of the aggregate containing 100 particles is about 5.1 mm to about 5.4 mm, and the average value of the long diameter of the cross-section ellipse is It is about 4.1 mm to about 4.3 mm, and the average value of the short diameter is about 2.2 mm to about 2.3 mm. Using the obtained pellets, test pieces for each evaluation were prepared for evaluation by the following method. The results are shown in Table 1 and Table 2. (Measurement method of melt viscosity) After drying the obtained particles and the particles of the polycarbonate resin (A) at 120°C for 4 hours or more, a capillary rheometer (manufactured by Shimadzu Corporation, Inc., flow test method CFT- 500), at a measurement temperature of 220°C, the melt viscosity is measured within a range of shear rate ¹ sec ^-1 to 100 sec ^-1 . The melt viscosity of the polycarbonate resin composition at a shear rate of 10 sec ^-1 was set to η1, and the melt viscosity of the polycarbonate resin (A) was set to η2. (Production method of test piece) After drying the obtained pellets at 120°C for 4 hours or more, an injection molding machine (manufactured by FANUC Co., Ltd., ROBOSHOT S2000il00A) was used to produce at a molding temperature of 360°C and a mold temperature of 80°C. Multi-purpose test specimen type A (full length 168mm×thickness 4mm) specified by JIS K 7139 "Plastics-Test Specimens". The end surface of the test piece was cut, and the cut end surface was mirror-finished using a resin plate end mirror machine (manufactured by MEGALO TECHNICA Co., Ltd., Pla-Beauty PB-500). (Evaluation method of cumulative transmittance) A spectrophotometer (manufactured by Hitachi, Ltd., UH4150) is equipped with a long light path measurement supporting device, using a 50W halogen lamp as a light source, and masking 5.6mm x 2.8mm before using the light source. In the state of 6.0 mm × 2.8 mm before the sample, the spectral transmittance of each 1 nm test piece is measured in the region of wavelength 380 to 780 nm for the entire length of the test piece. The cumulative transmittance can be calculated by rounding off the ten-digit number for the cumulatively measured spectral transmittance. In addition, when the cumulative transmittance is 30,000 or more, it is regarded as good (indicated by ○ in the table), and when it is less than 30,000, it is regarded as defective (indicated by × in the table). (Evaluation method of yellowness) Based on the spectral transmittance measured in the above-mentioned evaluation method of cumulative transmittance, using standard light source D65, each yellowness was determined from a 10 degree visual field. In addition, if the yellowness is 20 or less, it is regarded as good (in the table, indicated by ○), and if it exceeds 20, it is regarded as poor (in the table, indicated by ×).

The polycarbonate resin compositions of Examples 1 to 18 are made of polycarbonate resin (A), and the melt viscosity modifiers (B) of specific polyether derivatives and the like and the phosphite compound (C) A person who has a specific ratio. Therefore, the cumulative transmittance of the test piece molded from the polycarbonate resin composition is high, and the yellowness is small. In this way, the polycarbonate resin compositions of Examples 1 to 18 do not impair the heat resistance originally possessed by the polycarbonate resin (A), the visible light transmittance is high, and the molding process is performed at a high temperature , The light transmittance is also excellent. In addition, the molded product obtained by molding this polycarbonate resin composition has a small yellowness and an excellent color tone, and the color tone is also excellent when the molding process is performed at a high temperature. In contrast, in the polycarbonate resin composition of Comparative Example 1, the amount of the melt viscosity modifier (compound B1) such as a specific polyether derivative is small, so the cumulative transmittance is low and the yellowness is large. In this way, the molded product obtained by molding the polycarbonate resin composition of Comparative Example 1 has poor brightness and hue. The polycarbonate resin composition of Comparative Example 2 has a large amount of a specific melt viscosity modifier (compound B1), so the cumulative transmittance is low and the yellowness is large. In this way, the molded product obtained by molding the polycarbonate resin composition of Comparative Example 2 has poor brightness and color tone. In the polycarbonate resin composition of Comparative Example 3, the amount of the phosphite-based compound (C) is small, so the yellowness of the test piece is large. In this way, the molded product obtained by molding the polycarbonate resin composition of Comparative Example 3 has a poor color tone. The polycarbonate resin composition of Comparative Example 4 has a large amount of phosphite-based compound (C), so the cumulative transmittance is low and the yellowness is large. In this way, the molded product obtained by molding the polycarbonate resin composition of Comparative Example 4 has poor brightness and color tone. In the polycarbonate resin composition of Comparative Example 5, since the amount of the specific melt viscosity modifier (compound B5) is small, the cumulative transmittance is low and the yellowness is large. In this way, the molded article obtained by molding the polycarbonate resin composition of Comparative Example 5 has poor brightness and color tone. The polycarbonate resin composition of Comparative Example 6 has a large amount of a specific melt viscosity modifier (compound B5), so the cumulative transmittance is low and the yellowness is large. In this way, the molded article obtained by molding the polycarbonate resin composition of Comparative Example 5 has poor brightness and hue. As described above, the embodiments have been described with examples of the technology in the present invention. Therefore, a detailed explanation is provided. Therefore, the components described in the detailed description include not only the components necessary for solving the problem, but also the components not necessary for solving the problem in order to exemplify the above technology. Therefore, it is not necessary to directly identify such non-essential components as essential components because they are included in the detailed description. In addition, the above-mentioned embodiment is for exemplifying the technology in the present invention, so various changes, substitutions, additions, omissions, etc. can be made within the scope of the patent application or its uniform scope. (Industrial Applicability) The polycarbonate resin composition of the present invention does not impair the inherent heat resistance and mechanical strength characteristics of the polycarbonate resin, has excellent thermal stability and weather resistance, and is at high temperature In the case of forming processing, the light transmittance is also excellent. Therefore, for example, even if it is a thin light guide plate with a thickness of about 0.3 mm, the appearance changes due to hue change, or the resin itself is deteriorated by high-temperature molding, and the industrial use value is extremely high.

Claims (8)

A polycarbonate resin composition comprising a polycarbonate resin (A) and a melt viscosity adjuster (B), which contains 0.005 to 3.0 parts by weight of the above-mentioned melt viscosity with respect to 100 parts by weight of the polycarbonate resin (A) The adjusting agent (B) has a melt viscosity of the polycarbonate resin composition η1 and a melt viscosity of the polycarbonate resin (A) η2 when the melt viscosity at a measurement temperature of 220° C. and a shear rate of 10 sec ^-1 is set to η. The ratio η1/η2 satisfies 0.45≦η1/η2≦0.95. The melt viscosity adjuster (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-(XO)m(YO)nR' (1) (wherein R and R'independently represent a hydrogen atom or an alkyl group having 1 to 30 carbon atoms; X represents a carbon number 4 alkylene; Y represents a branched alkylene having 3 to 5 carbon atoms; m and n independently represent integers of 3 to 60; m+n represents integers of 8 to 90). The polycarbonate resin composition according to claim 1, wherein the polyether derivative represented by the above general formula (1) is a polyether derivative represented by the following general formula (2), and the polyether derivative The weight average molecular weight is 1000~4000; general formula (2): HO-(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH ₂ CH(CH ₃ )CH ₂ O)nH (2) (where, m and n independently represent integers from 3 to 60; m+n represents integers from 8 to 90). The polycarbonate resin composition according to claim 1, wherein the polyether derivative represented by the above general formula (1) is a polyether derivative represented by the following general formula (8), and the polyether derivative The weight average molecular weight is 1000~4000; general formula (8): HO-(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH(CH ₃ )O)nH (8)(where m and n are respectively Independently represents an integer from 3 to 60; m+n represents an integer from 8 to 90). The polycarbonate resin composition according to claim 1, wherein the polyether derivative represented by the above general formula (1) is a polyether derivative represented by the following general formula (9), and the polyether derivative The weight average molecular weight is 1000~4000; general formula (9): HO-(CH ₂ CH ₂ CH ₂ CH ₂ O)m(CH ₂ CH(C ₂ H ₅ )O)nH (9) (where m and n independently represents an integer of 3~60; m+n represents an integer of 8~90). The polycarbonate resin composition according to any one of claims 1 to 4, which further contains any one of a stabilizer, an antioxidant, a colorant, a mold release agent, a softener, an antistatic agent, and an impact modifier. An optical molded article comprising the polycarbonate resin combination of any one of claims 1 to 5 Thing. The molded article for optics according to claim 6, wherein the molded article is a light guide plate. A method for manufacturing a molded article for optics, which comprises molding the polycarbonate resin composition according to any one of claims 1 to 5.