发明名称 |
PROCESS FOR MAKING PEN/PET BLENDS AND TRANSPARENT ARTICLES THEREFROM |
摘要 |
Process for controlling the 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 alkylene 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 alkylene 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 alkylene glycol which enables substantial transesterification, without excessive increase in IV.
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申请公布号 |
WO9824844(A1) |
申请公布日期 |
1998.06.11 |
申请号 |
WO1997US22353 |
申请日期 |
1997.12.05 |
申请人 |
CONTINENTAL PET TECHNOLOGIES, INC.;SCHMIDT, STEVEN, L.;LYNCH, BRYAN;AGRAWAL, AMIT, SURESH |
发明人 |
SCHMIDT, STEVEN, L.;LYNCH, BRYAN;AGRAWAL, AMIT, SURESH |
分类号 |
C08G63/80;C08L67/02;(IPC1-7):C08L67/02 |
主分类号 |
C08G63/80 |
代理机构 |
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