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Copolycarbonate copolymer and process for producing the same, resin composition and shaping product

A polycarbonate and copolymer technology, used in the field of optical components, can solve the problems of low fluidity, yellowing, and large influence, and achieve the effect of reducing discoloration and yellowing

Inactive Publication Date: 2013-04-10
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a disadvantage that when this PC molded product is used for optical components such as lenses, light guide plates, and optical discs, satisfactory molded products cannot be obtained due to low fluidity
[0006] However, there is a problem that continuous production of the polycarbonate copolymer obtained by copolymerizing poly-1,4-butanediol-bis(4-hydroxybenzoate) described in the above-mentioned Patent Document 2 cannot be carried out at a high temperature exceeding 320° C. Yellowing occurs when using this copolymer under molding conditions
[0008] This kind of yellowing is also caused by the high molding temperature, but it is also greatly affected by the catalyst contained in the copolymer

Method used

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  • Copolycarbonate copolymer and process for producing the same, resin composition and shaping product
  • Copolycarbonate copolymer and process for producing the same, resin composition and shaping product
  • Copolycarbonate copolymer and process for producing the same, resin composition and shaping product

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Embodiment

[0129] The present invention will be further specifically described below through examples and comparative examples, but the present invention is not limited to these examples. In addition, the amount of impurities in each example was measured by the following method.

[0130] [Production Example 1 - Synthesis of poly-1,4-butanediol-bis(4-hydroxybenzoate)]

[0131] Nitrogen gas is introduced into a reaction vessel equipped with a stirrer, a thermometer, a reflux cooler, a raw material supply port, and a gas introduction pipe, and 100 parts by mass of poly-1,4-butanediol [PTMG, Mn (number average molecular weight)=2000 ], 15.8 parts by mass of methyl p-hydroxybenzoate, and 0.05 parts by mass of dibutyltin oxide as a tin-based catalyst were heated to 220° C., and transesterification was carried out while distilling off the generated methanol. After completion of the reaction, the inside of the reaction system was reduced in pressure, and excess methyl p-hydroxybenzoate was dist...

manufacture example 3

[0141] Except having used 1.0 mass % phosphoric acid aqueous solution instead of 3.5 mass % phosphoric acid aqueous solution, it carried out similarly to manufacture example 1, and obtained PTMG-BHB. By the following HPLC (high performance liquid chromatography) quantification, quantification of tin, and quantification of phosphate ions, it was confirmed that p-hydroxybenzoic acid in PTMG-BHB was less than 10 mass ppm, methyl p-hydroxybenzoate was 0.2 mass%, tin It is 10ppm, and phosphorus is less than 2ppm.

manufacture example 4

[0143] Except having made 5.0 mass % phosphoric acid aqueous solution instead of 3.5 mass % phosphoric acid aqueous solution, it carried out similarly to manufacture example 1, and obtained PTMG-BHB. By the following HPLC (high performance liquid chromatography) quantification, quantification of tin, and quantification of phosphate ions, it was confirmed that p-hydroxybenzoic acid was less than 10 mass ppm, methyl p-hydroxybenzoate was 0.2 mass%, tin was 5 ppm, and phosphorus was 4ppm.

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Abstract

The present invention provides a copolycarbonate copolymer and a resin composition which shaping products may be used for transparent optical devices, particularly optical devices such as lens, optical conductor, optical disc, etc., and methods for manufacturing the same. The copolycarbonate copolymer contains repeat units represented by general formulas (I) (II), tin content (as element) is lessthan 0.5ppm. In the general formula (I), R<1> and R<2> represent an alkyl having 1 to 6 carbon atom(s) separately. X is one of a single key, an alkylidene group (-CnH2n-) having 1 to 8 carbon atom(s), an alkylidene group (CnH2n=) having 2 to 8 carbon atoms, a cycle alkylidene group (-CnH(2n-2)-) having 5 to 15 carbon atoms, a cycle alkylidene group (CnH(2n-2)=) having 5 to 15 carbon atoms, -S-, -SO-, -SO2-, -O-, -CO- and a group represented by formula (III-1) or formula (III-2). R<3> and R<4> represent an alkyl having 1 to 3 carbon atom(s) separately. Y represents an alkylidene group (-CnH2n-) containing a straight chain having 2 to 15 carbon atoms or a branched chain. a to d is an integer from 0 to 4 separately, n is an integer from 2 to 200.

Description

technical field [0001] The present invention relates to a polycarbonate copolymer excellent in color tone and durability during high-temperature molding, a method for producing the same, a resin composition containing the copolymer, and a molded article which can be used for transparent optical parts, especially lenses and light guides , CD and other optical components. Background technique [0002] Polycarbonate (hereinafter sometimes referred to as PC) copolymer is mainly made of bisphenol A, and the improvement of various properties of PC copolymer has never stopped. PC produced from bisphenol A or the like is widely used in various applications because of its excellent transparency, heat resistance, and mechanical properties (especially impact resistance). However, there is a disadvantage that when the molded article of PC is used for optical components such as lenses, light guide plates, and optical disks, satisfactory molded articles cannot be obtained due to low flui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/06C08G64/08C08G64/38C08L69/00
CPCC08G64/04C08G64/20C08J5/00C08L69/00C08L2666/78
Inventor 石川康弘菅浩一藤冈亚起堀尾庆彦
Owner IDEMITSU KOSAN CO LTD