Polyester and process for preparing polyester

The present invention relates to a novel polyester and to a process for preparing a polyester. More particularly, the invention relates to a novel polyester having excellent gas barrier properties, transparency and heat resistance and hardly generate acetaldehyde and to a process for preparing such...

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Main Author Nakamachi, Koji
Format Patent
LanguageEnglish
Published 12.03.2002
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Abstract The present invention relates to a novel polyester and to a process for preparing a polyester. More particularly, the invention relates to a novel polyester having excellent gas barrier properties, transparency and heat resistance and hardly generate acetaldehyde and to a process for preparing such a polyester. A process for preparing a polyester comprising the steps of blending (A) polyethylene terephthalate before solid phase polymerization having an intrinsic viscosity of 0.3 to 0.8 dl/g in an amount of 40 to 99% by weight, with (B) polyethylene naphthalate before solid phase polymerization having an intrinsic viscosity of 0.3 to 0.7 dl/g in an amount of 1 to 60% by weight, and subjecting the blend to solid phase polymerization. The process of the invention can provide a polyester having excellent gas barrier properties, transparency and heat resistance and hardly generating acetaldehyde.
AbstractList The present invention relates to a novel polyester and to a process for preparing a polyester. More particularly, the invention relates to a novel polyester having excellent gas barrier properties, transparency and heat resistance and hardly generate acetaldehyde and to a process for preparing such a polyester. A process for preparing a polyester comprising the steps of blending (A) polyethylene terephthalate before solid phase polymerization having an intrinsic viscosity of 0.3 to 0.8 dl/g in an amount of 40 to 99% by weight, with (B) polyethylene naphthalate before solid phase polymerization having an intrinsic viscosity of 0.3 to 0.7 dl/g in an amount of 1 to 60% by weight, and subjecting the blend to solid phase polymerization. The process of the invention can provide a polyester having excellent gas barrier properties, transparency and heat resistance and hardly generating acetaldehyde.
Author Nakamachi, Koji
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Snippet The present invention relates to a novel polyester and to a process for preparing a polyester. More particularly, the invention relates to a novel polyester...
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