Novel biobased polyester
US-2024327659-A1 · Oct 3, 2024 · US
Biaxially stretched polyester film and method for producing same
US9518195B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9518195-B2 |
| Application number | US-201214241525-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 3, 2012 |
| Priority date | Sep 6, 2011 |
| Publication date | Dec 13, 2016 |
| Grant date | Dec 13, 2016 |
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- Title
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Abstract
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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.
First claim
Opening claim text (preview).
The invention claimed is: 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. 2. A biaxially stretched polyester film, wherein at least on one side of the biaxially stretched polyester film according to claim 1 , at least one of aluminum, aluminum oxide and silicon oxide is vapor deposited, and the biaxially stretched polyester film has a gas barrier property and tear linearity. 3. A method for producing the biaxially stretched polyester film according to claim 1 , wherein a modified polybutylene terephthalate (modified PBT) including 5 to 20% by mass of a polytetramethylene glycol unit having a molecular weight of 600 to 4,000 and giving an amount of tetrahydrofuran (THF), generated by heat treating in a helium gas atmosphere at 180° C. for 30 minutes, of 800 μg/g or less and polyethylene terephthalate (PET) are mixed so as for a mass ratio (modified PBT/PET) between the modified PBT and PET to be 20/80 to 5/95, a film is formed from a resulting mixture and a formed film is stretched.
Assignees
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Classifications
combined with shaping by orienting, stretching or shrinking, e.g. film blowing (B29C48/0017 takes precedence) · CPC title
Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.] · CPC title
PBT, i.e. polybutylene terephthalate · CPC title
biaxial · CPC title
Combined thermoforming and prestretching, e.g. biaxial stretching · CPC title
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- What does patent US9518195B2 cover?
- 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, t…
- Who is the assignee on this patent?
- Okuzu Takayoshi, Suzuki Tomoharu, Unitika Ltd
- What technology area does this patent fall under?
- Primary CPC classification C09D167/02. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 13 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).