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Wholly aromatic polyester, polyester resin composition, and polyester molded article

A technology of wholly aromatic polyester and polyester resin, applied in the direction of one-component polyester rayon, one-component copolyester rayon, etc. Problems such as cracks and insufficient heat resistance occur, resulting in less warpage deformation, good formability, and excellent flatness

Active Publication Date: 2016-08-31
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the copolyesters proposed in Patent Documents 1 to 3 have the following problems: low toughness, cracks in molded products during molding, or high toughness but insufficient heat resistance
[0010] However, in the invention described in Patent Document 5, cracks (cracks) after molding may occur in the mesh part due to variations in the production of polymers and changes in fine manufacturing conditions such as molding conditions, and sufficient crack resistance cannot be obtained. performance

Method used

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  • Wholly aromatic polyester, polyester resin composition, and polyester molded article
  • Wholly aromatic polyester, polyester resin composition, and polyester molded article
  • Wholly aromatic polyester, polyester resin composition, and polyester molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] The following raw material monomers, a metal catalyst, and an acylating agent were put into a polymerization vessel equipped with a stirrer, a reflux column, a monomer inlet, a nitrogen inlet, and a decompression / outflow line, and nitrogen replacement was started.

[0168] (1) 4-hydroxybenzoic acid: 145g (48 mol%) (HBA)

[0169] (II) 6-hydroxy-2-naphthoic acid: 12g (3 mol%) (HNA)

[0170] (III) Terephthalic acid: 89g (24.7 mol%) (TA)

[0171] (IV) Resorcinol: 8g (3.5 mol%) (RES)

[0172] (V) 4,4'-Dihydroxybiphenyl 85g (20.8 mol%) (BP)

[0173] Potassium acetate catalyst: 15mg

[0174] Acetic anhydride: 229g

[0175] After feeding the raw materials, the temperature of the reaction system was raised to 140° C. and reacted at 140° C. for 3 hours. Then, the temperature was raised to 360° C. over 5.5 hours, and then the pressure was reduced to 10 Torr (that is, 1330 Pa) over 20 minutes, and melt polymerization was carried out while distilling acetic acid, excess acetic ...

Embodiment 2～3

[0179] Except that the kinds and charging ratios of the raw material monomers were as shown in Table 1, polymerization was carried out in the same manner as in Example 1, and the polymer was discharged from the lower part of the polymerization vessel. Table 1 shows the results of physical property measurements of the obtained polymers.

Embodiment 4

[0187] The following raw material monomers, a metal catalyst, and an acylating agent were put into a polymerization vessel equipped with a stirrer, a reflux column, a monomer inlet, a nitrogen inlet, and a decompression / outflow line, and nitrogen replacement was started.

[0188] (1) 4-hydroxybenzoic acid: 1061g (48 mol%) (HBA)

[0189] (II) 6-hydroxy-2-naphthoic acid: 90g (3 mol%) (HNA)

[0190] (III) Terephthalic acid: 657g (24.7 mol%) (TA)

[0191] (IV) Resorcinol: 62g (3.5 mol%) (RES)

[0192] (V) 4,4'-dihydroxybiphenyl 620g (20.8 mol%) (BP)

[0193] Potassium acetate catalyst: 110mg

[0194] Acetic anhydride: 1676g

[0195] After feeding the raw materials, the temperature of the reaction system was raised to 140° C. and reacted at 140° C. for 3 hours. Then, the temperature was raised to 360° C. over 5.5 hours, and then the pressure was reduced to 5 Torr (ie, 667 Pa) over 20 minutes, and melt polymerization was carried out while distilling acetic acid, excess acetic a...

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Abstract

Provides wholly aromatic polyesters that are excellent in heat resistance and toughness, and exhibit optical anisotropy when melted, and a composition thereof. A wholly aromatic polyester showing optical anisotropy during melting, characterized in that the wholly aromatic polyester comprises the following general formulas (I), (II), (III), (IV) and ( The structural unit shown in V) is an essential constituent, and the structural unit of (I) is 35 to 75 mol%, the structural unit of (II) is 2 to 8 mol%, and the structure of (III) is 8.5 to 31.5 mol% of units, 2 to 8 mol% of structural units of (IV), 0.5 to 29.5 mol% of structural units of (V), 4 to 10 mol% of structural units of (II)+(IV) and a polyester resin composition in which 120 parts by mass of an inorganic filler or an organic filler is blended with respect to 100 parts by mass of the wholly aromatic polyester.

Description

technical field [0001] The present invention relates to a wholly aromatic polyester and a polyester resin composition which are excellent in heat resistance and toughness and can be produced by a normal polymerization apparatus, and polyester molded articles obtained by molding them. Background technique [0002] As a wholly aromatic polyester, the currently commercially available wholly aromatic polyester contains 4-hydroxybenzoic acid as a main component. However, since the melting point of the homopolymer of 4-hydroxybenzoic acid is higher than the decomposition point, it is necessary to lower the melting point by copolymerizing various components. [0003] The melting point of wholly aromatic polyesters using terephthalic acid, hydroquinone, 4,4'-dihydroxybiphenyl, etc. as copolymerization components is as high as 350°C or higher, which is too high for melt processing with conventional equipment. Furthermore, various methods have been tried in order to lower the melting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/60C08K3/34C08K7/14C08L67/03D01F6/62
CPCC08K7/14C08G63/605D01F6/84C08K3/346C08K3/34C08K3/013C08L67/03
Inventor 横田俊明
Owner POLYPLASTICS CO LTD