Production method for fluoropolymer, surfactant for polymerization, and use of surfactant
US-2021108008-A1 · Apr 15, 2021 · US
Method for producing fluoropolymer powder
US12503560B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12503560-B2 |
| Application number | US-202017602448-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 16, 2020 |
| Priority date | Apr 16, 2019 |
| Publication date | Dec 23, 2025 |
| Grant date | Dec 23, 2025 |
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Abstract
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A method for producing a fluoropolymer powder including (A1) adding, to a fluoropolymer aqueous dispersion obtained by polymerization using a carboxylic acid type hydrocarbon surfactant, and an acid to adjust a pH to 4.0 or less and cause coagulation to thereby obtain a wet fluoropolymer powder containing a fluorine-containing compound represented by the following general formula (1A), and (B1) heat-treating the wet fluoropolymer powder at a temperature higher than 150° C. and lower than 240° C.: General Formula (1A): H—(CF2)m—COOH wherein m is 3 to 19.
First claim
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The invention claimed is: 1 . A method for producing a fluoropolymer powder, comprising: (A1) adjusting a pH of a fluoropolymer aqueous dispersion, obtained by polymerization using a carboxylic acid hydrocarbon surfactant, to 4.0 or less by adding an acid and to cause coagulation to thereby obtain a wet fluoropolymer powder containing a fluorine-containing compound represented by the following formula (1A); H—(CF 2 ) m —COOH, Formula (1A): wherein m is 3 to 19; and (B1) heat-treating the wet fluoropolymer powder at a temperature higher than 150° C. and lower than 240° C. in hot air circulation, thereby reducing an amount of the fluorine-containing compound in the fluoropolymer powder. 2 . The method according to claim 1 , wherein the wet fluoropolymer powder contains two or more fluorine-containing compounds represented by the general formula (1A). 3 . The method according to claim 1 , wherein the wet fluoropolymer powder is substantially free from a salt of a fluorine-containing compound represented by the general formula (1A). 4 . The method according to claim 1 , wherein the fluoropolymer is a polytetrafluoroethylene. 5 . A method for producing a fluoropolymer powder, comprising: (A2) adjusting a pH of a fluoropolymer aqueous dispersion, obtained by polymerization using an aliphatic carboxylic acid hydrocarbon surfactant, to 4.0 or less by adding an acid and to cause coagulation to thereby obtain a wet fluoropolymer powder containing a fluorine-containing compound represented by the following formula (1A): H—(CF 2 ) m —COOH Formula (1A): wherein m is 3 to 19; and (B2) heat-treating the wet fluoropolymer powder at a temperature higher than 100° C. in hot air circulation, thereby reducing an amount of the fluorine-containing compound in the fluoropolymer powder. 6 . The method according to claim 5 , wherein the temperature of the heat treatment is higher than 150° C. and lower than 240° C. 7 . The method according to claim 5 , wherein the wet fluoropolymer powder contains two or more fluorine-containing compounds represented by the general formula (1A). 8 . The method according to claim 5 , wherein the wet fluoropolymer powder is substantially free from a salt of a fluorine-containing compound represented by the general formula (1A). 9 . The method according to claim 5 , wherein the fluoropolymer is a polytetrafluoroethylene.
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Classifications
Homopolymers or copolymers of tetrafluoroethylene · CPC title
Tetrafluoroethene · CPC title
Aqueous solvent · CPC title
Purification · CPC title
Homopolymers or copolymers of tetrafluoroethylene · CPC title
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- What does patent US12503560B2 cover?
- A method for producing a fluoropolymer powder including (A1) adding, to a fluoropolymer aqueous dispersion obtained by polymerization using a carboxylic acid type hydrocarbon surfactant, and an acid to adjust a pH to 4.0 or less and cause coagulation to thereby obtain a wet fluoropolymer powder containing a fluorine-containing compound represented by the following general formula (1A), and (B1)…
- Who is the assignee on this patent?
- Daikin Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08J3/12. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 23 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).