Recycled polyester raw materials and recycled polyester film
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MITSUBISHI CHEM CORP
- Filing Date
- 2022-05-11
- Publication Date
- 2026-06-09
AI Technical Summary
【0016】 本発明によれば、積層ポリエステルフィルムの機能層を十分に除去して得られる再生ポリエステル原料を提供することができる。 本発明の再生ポリエステル原料は、機能層が十分に除去されているため、フィルムとした場合には、異物の少ない再生ポリエステルフィルムを得ることができる。 したがって、本発明の再生ポリエステル原料及び再生ポリエステルフィルムは、ポリエステルフィルムのリサイクル性を向上させ得るだけでなく、新たな異物形成を抑制し、異物管理が極めて厳しいディスプレイ用途等にも適用可能である。
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Abstract
Claims
1. A recycled polyethylene furanoate raw material obtained by removing a functional layer, wherein the intrinsic viscosity (IV) is 0.66 dL / g or more and 1.00 dL / g or less, and the spin-spin relaxation time of the ¹H nucleus obtained by evaluating the data obtained by pulse NMR under the conditions of 40°C, observation frequency 20 MHz, 90° pulse width 2.74 μs, pulse repetition time 2.0 s, and pulse mode Solid Echo method is 0.0109 ms or more, and the spin-spin relaxation time of the ¹H nucleus obtained by evaluating the data obtained by the exponential single relaxation model of formula (1) below satisfies formula (2) below. [Math 1] (In equation (1), M represents the magnetization intensity (%), y₀ represents the initial value of the magnetization intensity (%), Al is a constant, x is the measurement time, and T₂ represents the relaxation time.) T 1 / T 2 = 1.01 to 1.30 (2) T1: Relaxation time of the film after removal of the functional layer T2: Relaxation time of the film before removal of the functional layer
2. The recycled polyethylene furanoate raw material according to claim 1, wherein the relaxation time is 0.0150 ms or less.
3. The recycled polyethylene furanoate raw material according to claim 1 or 2, wherein the total amount of titanium content and antimony content is 50 to 450 ppm.
4. The recycled polyethylene furanoate raw material according to claim 3, wherein the antimony content is 450 ppm or less.
5. A recycled polyester film comprising a polyester layer containing the recycled polyethylene furanoate raw material described in claim 1 or 2.
6. The recycled polyester film according to claim 5, comprising a laminated structure of at least two or more layers.
7. The recycled polyester film according to claim 5, wherein the thickness of the polyester layer containing the recycled polyethylene furanoate raw material is 50% or more of the total thickness of the recycled polyester film.
8. A method for producing recycled polyester raw material, comprising removing a functional layer from a laminated polyester film having a functional layer on the surface of a polyester film using a cleaning agent, wherein the spin-spin relaxation time of the 1H nucleus obtained by evaluating the data obtained by pulse NMR under the conditions of 40°C, observation frequency of 20MHz, 90° pulse width of 2.74μs, pulse repetition time of 2.0s, and pulse mode Solid Echo method, using the following formula (1) as an indicator, satisfies the following formula (2). [Math 2] (In equation (1), M represents the magnetization intensity (%), y₀ represents the initial value of the magnetization intensity (%), Al is a constant, x is the measurement time, and T₂ represents the relaxation time.) T 1 / T 2 = 1.01 to 1.30 (2) T1: Relaxation time of the film after removal of the functional layer T2: Relaxation time of the film before removal of the functional layer