| 发明名称 | Biaxially stretched polyester film and method for producing same | ||
| 摘要 | A biaxially stretched polyester film, being a biaxially stretched film including a modified polybutylene terephthalate (modified PBT) and polyethylene terephthalate (PET), wherein a mass ratio (modified PBT/PET) between the modified PBT and PET is 20/80 to 5/95, the modified PBT is a PBT containing 5 to 20% by mass of a polytetramethylene glycol unit having a molecular weight of 600 to 4,000, the amount of tetrahydrofuran (THF) generated by heat treating the biaxially stretched film in a helium gas atmosphere at 180° C. for 30 minutes is 50 μg/g or less, and the biaxially stretched film has tear linearity in a lengthwise direction thereof. | ||
| 申请公布号 | US9518195(B2) | 申请公布日期 | 2016.12.13 |
| 申请号 | US201214241525 | 申请日期 | 2012.09.03 |
| 申请人 | UNITIKA LTD. | 发明人 | Okuzu Takayoshi;Suzuki Tomoharu |
| 分类号 | B29C51/04;B29C55/12;C08J5/18;C08G63/183;C09D167/02;B29C47/00;B29K67/00;B29K105/00 | 主分类号 | B29C51/04 |
| 代理机构 | Fildes & Outland, P.C. | 代理人 | Fildes & Outland, P.C. |
| 主权项 | 1. A biaxially stretched polyester film, being a biaxially stretched film comprising a modified polybutylene terephthalate (modified PBT) and polyethylene terephthalate (PET), wherein a mass ratio (modified PBT/PET) between the modified PBT and PET is 20/80 to 5/95, the modified PBT is a PBT containing 5 to 20% by mass of a polytetramethylene glycol unit having a molecular weight of 600 to 4,000, an amount of tetrahydrofuran (THF) generated by heat treating the biaxially stretched film in a helium gas atmosphere at 180° C. for 30 minutes is 50 μg/g or less, and the biaxially stretched film has tear linearity in a lengthwise direction thereof. | ||
| 地址 | Hyogo JP | ||