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 | |
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| Format | Patent |
| Language | English |
| Published |
12.03.2002
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| Online Access | Get full text |
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| Summary: | 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. |
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