发明名称 |
Process for making PEN/PET blends and transparent articles therefrom |
摘要 |
Process for controlling the rate of change of intrinsic viscosity and transesterification during solid stating of a polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) blend, with an effective amount of an ethylene glycol compound. The process enables the production of a copolymer based on predefined initial and final IV's and final transesterification level, by varying the solid-stating time and/or effective amount of ethylene glycol. In one embodiment, a relatively greater amount of post-consumer PET (e.g., 70%) having an IV of on the order of 0.72-0.73, is incorporated in the blend to provide a final IV on the order of 0.80-0.85, and a moderate, controlled level of transesterification; the blend is used to injection mold a sleeve layer of a preform. In another embodiment, a substantially transparent neck finish for a preform is made from a PEN/PET blend having an amount of ethylene glycol which enables substantial transesterification, without excessive increase in IV.
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申请公布号 |
US5902539(A) |
申请公布日期 |
1999.05.11 |
申请号 |
US19960760918 |
申请日期 |
1996.12.06 |
申请人 |
CONTINENTAL PET TECHNOLOGIES, INC. |
发明人 |
SCHMIDT, STEVEN L.;LYNCH, BRYAN;AGRAWAL, AMIT SURESH |
分类号 |
C08G63/80;C08L67/02;(IPC1-7):B29C49/06;B29C49/22;B29K35/00 |
主分类号 |
C08G63/80 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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