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High flow liquid crystalline polymer composition

A technology for liquid crystal polymers and compositions, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as adversely affecting the thermal and mechanical properties of polymers

Inactive Publication Date: 2014-04-30
TICONA LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, especially when this additive is used in relatively high amounts, it can lead to the formation of volatile products due to decomposition during melt processing and / or use
This can in turn lead to the formation of air bubbles that can adversely affect the thermal and mechanical properties of the polymer and thus limit the usefulness of the polymer in certain applications

Method used

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  • High flow liquid crystalline polymer composition
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  • High flow liquid crystalline polymer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] Compound A was synthesized as described above and tested for its effect on the melt viscosity of a polymer commercially available from Ticona, LLC having the following monomer content: 63% 4-hydroxybenzoic acid ("HBA"), 5% 2,6-hydroxynaphthoic acid (“HNA”), 16% terephthalic acid (“TA”), 11% 4,4’-bisphenol (“BP”) and 5% paracetamol (“ APAP"). More specifically, the polymer was heated at 120°C and powder coated with pentaerythritol tetrastearate (PETS, commercial grade Lonza Glycolube P) at a loading of 0.3 wt.% based on polymer weight. Compound A was tested at various concentrations. The result is shown below.

[0148]

[0149] As shown, even a small amount of Compound A produces a significant decrease in melt viscosity.

Embodiment 2

[0151] Compound A was synthesized as described above and its effect on the melt viscosity of the commercial grade polymers and filler materials used in Example 1 was tested. More specifically, a control sample was synthesized by heating the polymer at 120 °C and powder-coating it with pentaerythritol tetrastearate (PETS, commercial grade Lonza Glycolube P) at a loading of 0.3 wt% (based on polymer). Cloth the polymer. The coated polymer was then compounded with glass and talc fillers in a 25-mm extruder. Another sample was prepared in a similar manner, except that it contained 1 wt.% of Compound A. The compositions and their respective properties are shown below.

[0152] combination

[0153] intrinsic viscosity

[0154] As shown, Compound A was able to reduce viscosity even in the presence of filler materials.

Embodiment 3

[0156] Compounds A, B, C, E, F2 and G2 were synthesized as described above and their effect on the melt viscosity of the commercial grade polymer used in Example 1 was tested. More specifically, the polymer was heated at 120°C and powder coated with pentaerythritol tetrastearate (PETS, commercial grade Lonza Glycolube P) at a loading of 0.3 wt.% based on polymer weight. The thermal pellets were then coated with 2 wt.% (based on polymer weight) of one of Compounds A, B, C, E, F2 and G2. A control sample was also formed which used 4,4'-bisphenol in an amount of 2 wt.% as flow additive. The mixture was then melt compounded using a Leistritz 18 mm co-rotating fully intermeshing twin screw extruder with 6 temperature control zones (including at the extrusion die) and a total L / D of 30. A general purpose screw design was used to compound the oligomers into the resin matrix. All materials were fed via volumetric feeders to the feed inlet in the first barrel. The material is melted...

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Abstract

A liquid crystalline polymer composition that contains a liquid crystalline polymer and an aromatic amide oligomer is provided. The oligomer can serve as a flow aid by altering intermolecular polymer chain interactions, thereby lowering the overall viscosity of the polymer matrix under shear. The oligomer is also not easily volatized or decomposed during compounding, molding, and / or use, which minimizes off-gassing and the formation of blisters that would otherwise impact the final mechanical properties of a part made from the polymer composition. While providing the benefits noted, the aromatic amide oligomer does not generally react with the polymer backbone of the liquid crystalline polymer to any appreciable extent so that the mechanical properties of the polymer are not adversely impacted.

Description

Background technique [0001] Electrical components, such as fine-pitch connectors, are often fabricated from thermotropic liquid crystal polymers ("LCPs"). One benefit of such polymers is that they can exhibit relatively high "flow," meaning that when the polymer is heated under shear, the polymer uniformly fills intricate parts at a rapid rate without excessive spillage or other disadvantages. Ability to process problems. In addition to accommodating complex part geometries, high polymer flow can also improve the final properties of molded parts. Most notably, parts produced from well-flowing polymers generally exhibit improved dimensional stability due to lower molding stresses, which makes the part more modifiable to downstream thermal processes that may be affected by the Detrimental effects of warpage and other polymer stress relaxation processes that occur in poorly formed materials. [0002] Current commercial LCPs, despite their relatively high flow capabilities, sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/22C09K19/30C09K19/32C09K19/34C09K19/38C09K19/48C08G69/44C08L77/12
CPCC09K19/322C09K19/3444C08L77/12C09K19/22C09K19/3086C09K19/3809C09K19/48C09K2019/0481
Inventor K·P·奈尔J·J·格伦西S·巴苏S·D·格雷
Owner TICONA LLC
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