Polytrimethylene terephthalate
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United States of America Patent
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Issued Date -
Jan 26, 2006
app pub date -
Jul 19, 2005
filing date -
Jul 20, 2004
priority date (Note) -
Abandoned
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Abstract
Polytrimethylene terephthalate which has a low content of a cyclic dimer and hardly produces the cyclic dimer when it is melt molded and a fiber made from the polytrimethylene terephthalate. Polytrimethylene terephthalate (A) is essentially composed of a trimethylene terephthalate unit, has an intrinsic viscosity of 0.5 to 1.6 dl/g and contains 0.01 to 0.5 wt % of a compound represented by the following formula (I) or (II): (R.sub.1, R.sub.2 and R.sub.3 are the same or different hydrocarbon groups having 1 to 10 carbon atoms, n is an integer of 1 to 5, M is an alkali metal atom or alkali earth metal atom, and m is 1 when M is an alkali metal atom and 2 when M is an alkali earth metal atom), (R.sub.4 and R.sub.5 are the same or different and each a hydrogen atom or hydrocarbon group having 1 to 10 carbon atoms).
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