Polycarbonate and process for producing the same

A technology of polycarbonate and diester carbonate, which is applied in the field of polycarbonate and its preparation, can solve the problems of lack of heat resistance and achieve the effect of excellent heat resistance

Active Publication Date: 2006-07-19
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] These polycarbonates are block copolymers or random copolymers, and the glass transition point decreases with the growth of the respective aliphatic chains, observed at 65°C or 59°C, 26°C or 20°C, 12°C or 23°C, -1°C or 7°C, so lack of heat resistance
[0020] In addition, JP-A No. 2003-292603 published after the basic filing date of the present application describes a thermoplastic molding material containing a polycarbonate compound obtained from isosorbide, but even if its glass transition temperature is sufficiently higher than room temperature , but still need to further improve the heat resistance

Method used

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  • Polycarbonate and process for producing the same
  • Polycarbonate and process for producing the same
  • Polycarbonate and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] 29.23 parts by weight of isosorbide, 1.51 parts by weight of ethylene glycol and 49.48 parts by weight of diphenyl carbonate were added to the reactor, and 2×10 -3 Parts by weight polymerization catalyst tetramethylammonium hydroxide (relative to 1 mole of diol component is 1 * 10 -4 Mole) and 30×10 -4 Parts by weight 2,2-bis(4-hydroxyphenyl)propane disodium salt (relative to 1 mole of diol component is 0.5×10 -6 mol), melted at 180°C in a nitrogen atmosphere.

[0079] Under stirring, the pressure in the reaction tank was reduced to 13.3×10 -3 MPa, reacted for 20 minutes while distilling off the produced phenol. Then, after raising the temperature to 200°C, the pressure was reduced slowly, and the phenol was distilled off at 4.00×10 -3 The reaction was carried out at MPa for 25 minutes, and then the temperature was raised to 215° C. for 10 minutes.

[0080] Next, depressurize slowly, then at 2.67×10 -3 Reaction under MPa for 10 minutes, at 1.33×10 -3 The reaction...

Embodiment 2～5

[0083] The isosorbide, ethylene glycol and diphenyl carbonate of amount shown in table 1 are joined in the reactor, add polymerization catalyst tetramethyl ammonium hydroxide and 2,2-bis(4 -Hydroxyphenyl)propane disodium salt was melted at 180° C. under a nitrogen atmosphere, and polymerized in the same manner as in Example 1 to obtain a polymer. The reduced viscosity and glass transition temperature are listed in Table 1.

Embodiment 6～8

[0085] Isosorbide, 1,3-propylene glycol and diphenyl carbonate of amount shown in table 1 are joined in the reactor, add polymerization catalyst tetramethylammonium hydroxide and 2,2- with the same concentration ratio of Example 1 Bis(4-hydroxyphenyl)propane disodium salt was melted at 180°C under a nitrogen atmosphere.

[0086] This was polymerized in the same manner as in Example 1 to obtain a polymer. The reduced viscosity and glass transition temperature are listed in the table.

[0087] The polymer obtained in Example 6 was formed into a dumbbell-shaped molded sheet and a 120 mm×12 mm×3 mm plate-shaped molded sheet, and the formability thereof was evaluated. The results are listed in Table 3.

[0088] A film prepared from the polymer prepared in Example 6 was evaluated for biodegradability, and the weight loss rate was 15.9%.

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Abstract

A polycarbonate comprising ether diol residues which can be produced from a carbohydrate of the formula: (1) and comprising diol residues of the formula: -O-(CmH2m)-O- (2) (wherein m is an integer of 2 to 12), wherein the ratio of ether diol residues to all the diol residues is in the range of 65 to 98 wt.%, the polycarbonate having a glass transition temperature of 90 DEG C or higher.

Description

technical field [0001] The present invention relates to a polycarbonate having a moiety derivable from renewable resource sugars and having excellent heat resistance and a method for preparing the same. Background technique [0002] Polycarbonates are generally produced using raw materials obtained from petroleum resources, but there is a need for a method of producing polycarbonates using raw materials obtained from renewable resources such as plants due to concerns over the depletion of petroleum resources. [0003] In addition, the following formula (3) is known [0004] [0005] The ether diol shown can be easily prepared from renewable resources, such as sugars and starch, etc., and it has 3 stereoisomers, specifically the following formula (5) [0006] [0007] The shown 1,4:3,6-dianhydro-D-sorbitol (hereinafter referred to as "isosorbide" in this specification), the following formula (6) [0008] [0009] 1,4:3,6-dianhydro-D-mannitol (hereinafter referred t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/02
Inventor 大野文丰原清纲峰松宏昌影山裕一
Owner TEIJIN LTD
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