Coating composition and laminate
US-2024093052-A1 · Mar 21, 2024 · US
Process for producing polytetrafluoroethylene molding powder and process for producing polytetrafluoroethylene agglomerated product
US9718930B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9718930-B2 |
| Application number | US-201514797282-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 13, 2015 |
| Priority date | Feb 5, 2013 |
| Publication date | Aug 1, 2017 |
| Grant date | Aug 1, 2017 |
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Abstract
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To provide a process for producing a PTFE molding powder having a high bulk density from granular polymer particles without using an emulsifying agent having problems of bioaccumulation and toxicity. A process for producing a polytetrafluoroethylene molding powder, which comprises a step of suspension-polymerizing a monomer containing at least 99.8 mass % of tetrafluoroethylene in an aqueous medium to produce granular polymer particles and a step of milling the granular polymer particles, wherein the aqueous medium contains a compound represented by R F (OCF(X 1 )CF 2 ) k-1 OCF(X 2 )COO − M + , at a concentration of from 0.5 to 2,000 ppm. R F is a perfluorinated C 1-10 monovalent organic group, X 1 and X 2 are fluorine atoms, etc., and M + is an ammonium ion or the like.
First claim
Opening claim text (preview).
What is claimed is: 1. A process for producing a polytetrafluoroethylene molding powder, which comprises: suspension-polymerizing a monomer consisting of tetrafluoroethylene in an aqueous medium to produce granular polymer particles and milling the granular polymer particles to form the polytetrafluoroethylene molding powder, wherein the aqueous medium contains a compound represented by the following formula (1) at a concentration of from 0.5 to 2,000 ppm: R F (OCF(X 1 )CF…
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Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
- C08F114/26Primary
Chemistry & Metallurgy · mapped topic
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- What does patent US9718930B2 cover?
- To provide a process for producing a PTFE molding powder having a high bulk density from granular polymer particles without using an emulsifying agent having problems of bioaccumulation and toxicity. A process for producing a polytetrafluoroethylene molding powder, which comprises a step of suspension-polymerizing a monomer containing at least 99.8 mass % of tetrafluoroethylene in an aqueous me…
- Who is the assignee on this patent?
- Asahi Glass Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08F114/26. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 01 2017 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).