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AssigneeTicona LLC
InventorsSteven D. Gray, Kamlesh P. Nair, Joseph J. Grenci
Estimating the term…
A thermotropic liquid crystalline polymer composition capable of exhibiting both a low melting temperature and good heat resistance without the use of conventional naphthenic acids is provided. The melting temperature may, for example, range from about 250° C. to about 400° C. Even at such low melting temperatures, the present inventors have surprisingly discovered that the ratio of the deflection temperature under load (“DTUL”), a measure of short term heat resistance, to the melting temperature may remain relatively high. The specific DTUL values may range from about 200° C. to about 300° C. The ability to form a polymer composition with the properties noted above may be achieved, at least in part, by the use of an aromatic amide oligomer.
A thermotropic liquid crystalline polymer composition that comprises a melt-polymerized liquid crystalline polymer, wherein the total amount of repeating units in the polymer derived from naphthenic hydroxcarboxylic or naphthenic dicarboxylic acids is no more than about 5 mol. %, and wherein the polymer composition has a melting temperature of from about 250° C. to about 400° C. and exhibits a deflection temperature under load such that the ratio of the deflection temperature under load to the melting temperature is from about 0.5 to about 1, the deflection temperature under load being determined in accordance ISO Test No. 75-2 at a load of 1.8 Megapascals.
A thermotropic liquid crystalline polymer composition that comprises a liquid crystalline polymer and an aromatic amide oligomer in an amount of from about 0.1 to about 5 parts by weight relative to 100 parts by weight of the polymer, wherein the polymer composition has a melting temperature of from about 250° C. to about 400° C. and exhibits a deflection temperature under load such that the ratio of the deflection temperature under load to the melting temperature is from about 0.5 to about 1, the deflection temperature under load being determined in accordance with ISO Test No. 75-2 at a load of 1.8 Megapascals.
Dependencies are inferred from the claim text.