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Wholly aromatic polyester and polyester resin composition

A technology of wholly aromatic polyester and polyester resin, applied in the field of polyester resin composition and wholly aromatic polyester, can solve the problems of inability to maintain mechanical strength and high melt processing, and achieve less production of sublimed products, Foreign body reduction effect

Pending Publication Date: 2021-11-26
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The melting point of wholly aromatic polyester using 1,4-phthalic acid, 1,4-dihydroxybenzene, 4,4'-dihydroxybiphenyl, etc. as copolymerization components is as high as 350°C or higher, and it is carried out in a general-purpose device too high for melt processing
Or, in order to lower the melting point of such a high-melting substance to a temperature that can be processed by general-purpose melting processing equipment, various methods have been tried, and the lowering of the melting point has been achieved to some extent, but on the other hand, there is a problem that the high temperature cannot be maintained ( The problem of mechanical strength at around the melting point)

Method used

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  • Wholly aromatic polyester and polyester resin composition
  • Wholly aromatic polyester and polyester resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] Examples are shown below to describe the present invention more specifically, but the present invention is not limited to these Examples.

[0102]

[0103] Into a polymerization vessel equipped with a stirrer, a reflux column, a monomer input port, a nitrogen gas inlet, and a decompression / outflow line, the following raw material monomers, fatty acid metal salt catalyst, and acylating agent were charged, and nitrogen replacement was started.

[0104] (I) 0.883 mol (48 mol%) of 6-hydroxy-2-naphthoic acid (HNA)

[0105] (II) 0.037 mol (2 mol%) of 4-hydroxybenzoic acid (HBA)

[0106] (III) 0.46 mol (25 mol%) of 1,4-phthalic acid (TA)

[0107] (IV) 0.46 mol (25 mol%) of 4,4'-dihydroxybiphenyl (BP)

[0108] Potassium acetate catalyst 150ppm

[0109] Tris(2,4-pentanedione)cobalt(III) catalyst 150ppm

[0110] 1.91 moles of acetic anhydride (1.04 times the total hydroxyl equivalent of HNA, HBA, and BP)

[0111] After feeding the raw materials, the temperature of the reac...

Embodiment 2～4

[0124]

[0125] A polymer was obtained in the same manner as in Example 1, except that the type, amount (mol%), and temperature increase rate of the raw material monomers were as shown in Table 1 and Table 2. In addition, the same evaluation as in Example 1 was performed (the melt viscosity of Example 4 and Comparative Example 4 was measured at a temperature of 350° C.). The evaluation results are shown in Table 1 and Table 2.

[0126] [Table 1]

[0127]

[0128] [Table 2]

[0129]

[0130] In addition, as shown in Table 2, in Comparative Example 8 in which the rate of temperature increase from 140° C. to 200° C. was 0.30° C. / minute, and in Comparative Example 9 in which the rate of temperature increase was 0.89° C. / minute, foreign matter was generated. In addition, as shown in Tables 1 and 2, in Comparative Example 2 in which the temperature increase rate from 200°C to 270°C was 0.60°C / min, in Comparative Example 5 at 0.69°C / min, and in Comparative Example 6 at 1.30...

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Abstract

To provide: a wholly aromatic polyester which produces less sublimates during a polymerization reaction, and includes less foreign substances; and this polyester resin composition. The above-described problem is solved by a wholly aromatic polyester which is characterized by containing, as essential constituents, the constituent units (I), (II), (III) and (IV) described below so that: the content of the constituent unit (I) relative to all constituent units is 40-75% by mole; the content of the constituent unit (II) relative to all constituent units is 0.5-7.5% by mole; the content of the constituent unit (III) relative to all constituent units is 8.5-30% by mole; the content of the constituent unit (IV) relative to all constituent units is 8.5-30% by mole; the total content of the constituent units (I), (II), (III) and (IV) relative to all constituent units is 100% by mole; and the difference between the content of the constituent unit (III) and the content of the constituent unit (IV) is 0.150% by mole or less.

Description

technical field [0001] The present invention relates to a wholly aromatic polyester having less generation of sublimates and reduced foreign matter during polymerization, and a polyester resin composition thereof. Background technique [0002] Liquid crystalline resins such as wholly aromatic polyesters have excellent fluidity, mechanical strength, heat resistance, chemical resistance, electrical properties, etc. in a well-balanced manner, and are widely used as high-functional engineering plastics. [0003] Most of the currently commercially available wholly aromatic polyesters contain 4-hydroxybenzoic acid as the main component. However, since the melting point of the homopolymer of 4-hydroxybenzoic acid becomes higher than a decomposition point, it is necessary to lower a melting point by copolymerizing various components. [0004] The melting point of wholly aromatic polyester using 1,4-phthalic acid, 1,4-dihydroxybenzene, 4,4'-dihydroxybiphenyl, etc. as copolymerizatio...

Claims

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Application Information

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IPC IPC(8): C08G63/60
CPCC08G63/60C08G63/78C08L67/00C08L67/03
Inventor 横田俊明川原俊纪
Owner POLYPLASTICS CO LTD
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