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Liquid crystalline polyester compositions containing carbon black

A technology of liquid crystal polyester, molding composition, applied in liquid crystal materials, chemical instruments and methods, printed circuit parts, etc., can solve the problem of not mentioning liquid crystal polyester, etc.

Inactive Publication Date: 2004-09-08
TICONA LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reference does not mention the liquid crystal polyester issue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example C-1

[0026] Using the melt polymerization method, using terephthalic acid, 2,6-naphthalene dicarboxylic acid, p-diacetoxybenzene and p-acetoxybenzoic acid as raw materials, prepared from 8.6 mol% terephthalic acid residues, 20 mol% 2, A liquid crystal polyester composed of 6-naphthalene dicarboxylic acid residues, 28.6 mol% hydroquinone residues and 42.8 mol% p-hydroxybenzoic acid residues and having an I.V. of about 6.0 dL / g. This LCP was then blended with Owens Corning OC492A glass fibers to prepare a liquid crystalline polyester molding composition containing 30 wt% glass fibers (Comparative Example C-1). The same LCP was blended with carbon black and Owens Corning OC492A glass fibers to make a liquid crystalline polyester molding composition containing 1.0 wt% carbon black and 30 wt% glass fibers (Example 1). 13 mm x 125 mm x 0.8 mm thick test strips were prepared from the two molding compositions and the flammability characteristics of the two strips were determined according ...

Embodiment 2 and 3 and comparative example C-2

[0029] Using terephthalic acid, 2,6-naphthalene dicarboxylic acid, p-diacetoxybenzene and p-acetoxybenzoic acid as raw materials, prepare 8.6 mol% terephthalic acid residues, 20 mol% 2,6-naphthalene dicarboxylic acid residues, 28.6 mol% hydroquinone residues and 42.8 mol% p-hydroxybenzoic acid residues, and a liquid crystal polyester with I.V. of about 6.2 dL / g was further polymerized by solid state polymerization. The LCP was blended with Owens Corning OC408BC glass fibers to prepare a liquid crystalline polyester molding composition containing 30 wt% glass fibers (Comparative Example C-2). This same LCP was blended with carbon black and Owens Corning OC408BC glass fibers to produce a liquid crystalline polyester molding composition containing 1.0 wt% carbon black and 30 wt% glass fibers (Example 2) and 2.0 wt% and 30 wt% Liquid-crystalline polyester molding composition of glass fibers (Example 3). Several test specimens of 13 mm x 125 mm x 0.8 mm thick (1 / 2 inch x 5 inch x ...

Embodiment

[0033] C-2 2 3

[0034] HDT 296 297 296

[0035] Tensile Strength 18,169 19,859 19,325

[0036] Elongation at break 1.5 1.7 1.8

[0037] Notched cantilever impact strength 2.1 1.9 1.9

[0038] UL-94 rating V2 / 42 V0 / 32 V0 / 36

[0039] The comparative C-2 molding composition received a V2 evaluation rating because one of the five test bars was drip-melted and ignited the cotton. The flame out time for this composition was 42 seconds, which was below the 50 second flame out time allowed for a V-0 rating.

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Abstract

Disclosed are liquid crystalline polyester molding compositions which are capable of being molded into an article having a thickness of less than 1.5 mm and a flammability classification of 94V-O as determined by the UL-94 20 mm Vertical Burning Test (ASTM D 3801) which are comprised of (i) certain all-aromatic, liquid crystal polyester consisting essentially of terephthalic acid residues, 2,6-naphthalenedicarboxylic acid residues, hydroquinone residues, and p-hydroxybenzoic acid residues; and (ii) about 0.1 to 10 weight percent, based on the total weight of the liquid crystalline polyester molding composition, carbon black. Theses liquid crystalline polyester molding compositions also may contain glass fiber. The disclosed molding compositions are particularly useful for manufacturing circuit boards and electrical connectors for use in various electronic devices.

Description

[0001] Citations to related applications [0002] This application claims the benefit of US Provisional Application No. 60 / 048,830, filed June 6,1997. field of invention [0003] The present invention relates to novel liquid crystalline polyester compositions derived from terephthalic acid, 2,6-naphthalene dicarboxylic acid, hydroquinone and p-hydroxybenzoic acid and containing about 0.1 to 10% by weight of carbon black. These new compositions can be molded into very thin articles and have a flammability rating of 94V-0 as measured by the UL-94 flammability test method. The liquid crystal composition also has excellent mechanical properties, excellent temperature resistance and excellent flame retardancy. The composition is particularly useful when blended with glass fibers and injection molded into thin products, and can be used as a support for circuit boards and / or electrical connectors, and can be used in electrical / electronic fields such as computers. Background of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/00C08G63/60C08K3/04H05K1/03
CPCC08G63/605H05K1/0373C08K3/04C08L67/02
Inventor G·M·斯塔克小T·R·瓦尔克
Owner TICONA LLC