Articles comprising copolyesters produced with germanium catalyst
US-2024376258-A1 · Nov 14, 2024 · US
Tube, method for producing tube, and method for storing tube
US12480605B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12480605-B2 |
| Application number | US-202217673374-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 16, 2022 |
| Priority date | Aug 21, 2019 |
| Publication date | Nov 25, 2025 |
| Grant date | Nov 25, 2025 |
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- Title
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Abstract
Official abstract text for this publication.
Provided is a tube comprising a tetrafluoroethylene/fluoroalkyl vinyl ether copolymer, wherein the tube inner surface has a surface roughness Ra of 5 nm or less measured by atomic force microscopy (AFM) with an evaluation length set to 3 μm, and the tube has an amount of metals eluted from the tube inner surface of 0.30 ng/cm 2 or less.
First claim
Opening claim text (preview).
The invention claimed is: 1 . A tube comprising a tetrafluoroethylene/fluoroalkyl vinyl ether copolymer, wherein the tube inner surface has a surface roughness Ra of 5 nm or less measured by atomic force microscopy (AFM) with an evaluation length set to 3 μm, and the tube has an amount of metals eluted from the tube inner surface of 0.30 ng/cm 2 or less. 2 . The tube according to claim 1 , wherein the tube inner surface has an average spherulite size of 1 to 150 μm. 3 . The tube according to claim 1 , wherein the tube inner surface has an average spherulite size of more than 15 μm. 4 . The tube according to claim 1 , wherein the fluoroalkyl vinyl ether is perfluoro(propyl vinyl ether). 5 . The tube according to claim 1 , wherein the tube is used for transporting a high-purity chemical solution for manufacturing a semiconductor device. 6 . The tube according to claim 1 , wherein the tube is obtained by extruding the tetrafluoroethylene/fluoroalkyl vinyl ether copolymer, while flowing a gas which has passed through a filter having a filtration accuracy of 5 nm or less into a hollow part of a tube extruded from the die equipped in an extruder. 7 . The tube according to claim 1 , wherein the content of a fluoroalkyl vinyl ether unit in the tetrafluoroethylene/fluoroalkyl vinyl ether copolymer is 1.0 to 8.0 mass % relative to the total monomer units. 8 . A method for producing the tube according to claim 1 , comprising, by using an extruder in which a die is equipped, extruding the tetrafluoroethylene/fluoroalkyl vinyl ether copolymer, while flowing a gas which has passed through a filter having a filtration accuracy of 5 nm or less into a hollow part of a tube extruded from the tip of the die. 9 . The production method according to claim 8 , wherein a resin temperature of the tetrafluoroethylene/fluoroalkyl vinyl ether copolymer at the tip of the die is 350 to 370° C. 10 . A method for storing the tube according to claim 1 , comprising storing the tube with a high-purity liquid filled inside the tube.
Assignees
Inventors
Classifications
Pipes; Pipe joints (pleated hoses B29D23/18) · CPC title
Die; Nozzle zone · CPC title
Temperature · CPC title
Heating · CPC title
Homopolymers or copolymers or tetrafluoroethene · CPC title
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Frequently asked questions
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- What does patent US12480605B2 cover?
- Provided is a tube comprising a tetrafluoroethylene/fluoroalkyl vinyl ether copolymer, wherein the tube inner surface has a surface roughness Ra of 5 nm or less measured by atomic force microscopy (AFM) with an evaluation length set to 3 μm, and the tube has an amount of metals eluted from the tube inner surface of 0.30 ng/cm 2 or less.
- Who is the assignee on this patent?
- Daikin Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification B29C48/022. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Nov 25 2025 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).