Novel copolymer with cyclic halamine structure
US-2016297911-A1 · Oct 13, 2016 · US
Method for producing stabilized fluoropolymer
US9458255B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9458255-B2 |
| Application number | US-201013260907-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 29, 2010 |
| Priority date | Mar 31, 2009 |
| Publication date | Oct 4, 2016 |
| Grant date | Oct 4, 2016 |
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Abstract
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The present invention is aimed to provide a highly-productive method for producing a stabilized fluoropolymer. The present invention relates to a method for producing a stabilized fluoropolymer, comprising the step of bringing a fluoropolymer to be treated into contact with a fluorinating agent to produce a stabilized fluoropolymer, while maintaining the concentration of hydrogen fluoride present in a reaction vessel at not higher than 1.0% by volume.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a stabilized fluoropolymer, comprising the step of bringing a fluoropolymer to be treated into contact with a fluorinating agent in a stationary reactor to produce a stabilized fluoropolymer, while maintaining the concentration of hydrogen fluoride present in a reaction vessel at not higher than 1.0% by volume, wherein the contacting step is carried out at a temperature of 50° C. or higher and 185° C. or lower, and the fluoropolymer to be treated is in the form of a resin powder, a pellet, or a membrane obtained through molding, and the fluoropolymer to be treated is constituted by 50 to 100 mol % of an ethylenic fluoromonomer unit and 0 to 50 mol % of a fluorinated alkyl vinyl ether unit, and the fluoropolymer to be treated has an unstable group and the unstable group is at least one group selected from the group consisting of —CF 2 COF, —CF 2 COOH, —CF 2 CH 2 OH, —CF 2 COOCH 3 , and —COOCO—, wherein —CF 2 COF —CF 2 COOH, —CF 2 CH 2 OH and —CF 2 COOCH 3 are terminal groups and wherein —COOCO— represents a group formed by bonding two —CF 2 COOH terminal groups. 2. The method for producing a stabilized fluoropolymer according to claim 1 , wherein the fluorinating agent is at least one substance selected from the group consisting of F 2 , NF 3 , SF 4 , ClF, ClF 3 , BrF 3 , and IF 5 . 3. The method for producing a stabilized fluoropolymer according to claim 1 , wherein the fluorinating agent is F 2 . 4. The method for producing a stabilized fluoropolymer according to claim 1 , wherein the contacting step is carried out at a temperature of 50° or higher and 120° or lower.
Assignees
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Classifications
Monomers containing fluorine · CPC title
- C08F8/20Primary
Halogenation · CPC title
Monomers containing fluorine · CPC title
by reaction with free halogens · CPC title
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- What does patent US9458255B2 cover?
- The present invention is aimed to provide a highly-productive method for producing a stabilized fluoropolymer. The present invention relates to a method for producing a stabilized fluoropolymer, comprising the step of bringing a fluoropolymer to be treated into contact with a fluorinating agent to produce a stabilized fluoropolymer, while maintaining the concentration of hydrogen fluoride prese…
- Who is the assignee on this patent?
- Isogai Tomohiro, Suzuki Tatsuo, Ino Tadashi, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification C08F8/20. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 04 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).