Polytetrafluoroethylene aqueous dispersion
US-2022275237-A1 · Sep 1, 2022 · US
Aqueous modified polytetrafluoroethylene dispersion
US12565580B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12565580-B2 |
| Application number | US-202318178918-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 6, 2023 |
| Priority date | Sep 7, 2020 |
| Publication date | Mar 3, 2026 |
| Grant date | Mar 3, 2026 |
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Abstract
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A modified polytetrafluoroethylene aqueous dispersion having low viscosity at high temperature. The modified polytetrafluoroethylene aqueous dispersion contains a modified polytetrafluoroethylene and a nonionic surfactant, has a modified polytetrafluoroethylene solid concentration of 50 to 70% by mass, is substantially free from a fluorine-containing surfactant, and has a viscosity at 55° C. of 80 mPa·s or lower, and the modified polytetrafluoroethylene contains 0.050% by mass or more and 1.00% by mass or less of a polymerized unit based on a modifying monomer.
First claim
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What is claimed is: 1 . A modified polytetrafluoroethylene aqueous dispersion comprising a modified polytetrafluoroethylene and a nonionic surfactant, the aqueous dispersion having a modified polytetrafluoroethylene solid concentration of 50 to 70% by mass, the aqueous dispersion being substantially free from a fluorine-containing surfactant, the aqueous dispersion having a viscosity at 55° C. of 80 mPa·s or lower, and the modified polytetrafluoroethylene containing 0.050% by mass or more and 1.00% by mass or less of a polymerized unit based on a modifying monomer. 2 . The aqueous dispersion according to claim 1 , wherein the fluorine-containing surfactant amounts to 100 ppb or more and 1.0 ppm or less. 3 . The aqueous dispersion according to claim 1 , wherein the aqueous dispersion has a ratio (viscosity at 55° C.)/(viscosity at 25° C.) of 4.00 or lower. 4 . The aqueous dispersion according to claim 1 , wherein the nonionic surfactant is contained in an amount of 4.0% by mass or more and 12.0% by mass or less relative to the modified polytetrafluoroethylene. 5 . The aqueous dispersion according to claim 1 , wherein the aqueous dispersion has a stability retention time at 60° C. of 20 minutes or longer. 6 . The aqueous dispersion according to claim 1 , wherein the nonionic surfactant contains a compound represented by the following formula (i): R 3 —O-A 1 -H (i) wherein R 3 is a C8-C18 linear or branched primary or secondary alkyl group; and A1 is a polyoxyalkylene chain. 7 . The aqueous dispersion according to claim 6 , wherein R 3 is an alkyl group represented by the following formula (i-1): CHR 31 R 32 — (i-1) wherein R 31 is a hydrogen atom or a C1-C16 alkyl group; R 32 is a C1-C17 alkyl group; and R 31 and R 32 have a total carbon number of 7 to 17. 8 . The aqueous dispersion according to claim 6 , wherein R 3 is a C8-C18 alkyl group having an average number of methyl groups of 2.0 or more. 9 . The aqueous dispersion according to claim 6 , wherein the nonionic surfactant is a mixture of compounds represented by the formula (i) with A1s having different average numbers of oxyethylene units.
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Classifications
Aqueous solutions or dispersions · CPC title
Homopolymers or copolymers or tetrafluoroethene · CPC title
non-ionic · CPC title
organic · CPC title
Dispersing agents (anti-settling agents C09D7/45) · CPC title
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Frequently asked questions
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- What does patent US12565580B2 cover?
- A modified polytetrafluoroethylene aqueous dispersion having low viscosity at high temperature. The modified polytetrafluoroethylene aqueous dispersion contains a modified polytetrafluoroethylene and a nonionic surfactant, has a modified polytetrafluoroethylene solid concentration of 50 to 70% by mass, is substantially free from a fluorine-containing surfactant, and has a viscosity at 55° C. of…
- Who is the assignee on this patent?
- Daikin Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08L27/24. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 03 2026 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).