Degradable polymeric compositions and articles comprising same
US-2024425683-A1 · Dec 26, 2024 · US
Method for producing porous polytetrafluoroethylene film and porous polytetrafluoroethylene film
US9493619B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9493619-B2 |
| Application number | US-201414758625-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 23, 2014 |
| Priority date | Jul 1, 2013 |
| Publication date | Nov 15, 2016 |
| Grant date | Nov 15, 2016 |
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Abstract
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Provided is a method for producing a porous polytetrafluoroethylene film having good chemical resistance, good heat resistance, a high porosity, and good dimensional stability. The method for producing a porous polytetrafluoroethylene film includes a stretching step of stretching a sheet-like molded body composed of a fluororesin containing polytetrafluoroethylene as a main component in a longitudinal direction and/or a lateral direction at a temperature lower than a melting point of the fluororesin to make a porous fluororesin film, and, after the stretching step, an annealing step of holding the porous fluororesin film in a shape-fixed state, and maintaining the porous fluororesin film at a temperature lower than the melting point of the fluororesin but not lower than a temperature 30° C. lower than the melting point for 1 to 20 hours.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a porous polytetrafluoroethylene film, comprising a stretching step of stretching a sheet-like molded body composed of a fluororesin containing polytetrafluoroethylene as a main component in a longitudinal direction and/or a lateral direction at a temperature lower than a melting point of the fluororesin to make a porous fluororesin film; and, after the stretching step, an annealing step of holding the porous fluororesin film in a shape-fixed state, and maintaining the porous fluororesin film at a temperature lower than the melting point of the fluororesin but not lower than a temperature 30° C. lower than the melting point for 1 to 20 hours. 2. The method for producing a porous polytetrafluoroethylene film according to claim 1 , comprising, after the stretching step and before the annealing step, a step of sintering the porous fluororesin film until a melting point peak of the fluororesin becomes 333° C. or lower by maintaining the porous fluororesin film at a temperature equal to or higher than the melting point of the fluororesin for 20 seconds or less. 3. The method for producing a porous polytetrafluoroethylene film according to claim 1 , further comprising, after the annealing step, a shrinking step of shrinking the porous fluororesin film by 15% or more in the lateral direction by maintaining the porous fluororesin film at a temperature equal to or higher than 120° C. but lower than the melting point of the fluororesin in a state where the shape of the porous fluororesin film is not fixed. 4. The method for producing a porous polytetrafluoroethylene film according to claim 2 , further comprising, after the annealing step, a shrinking step of shrinking the porous fluororesin film by 15% or more in the lateral direction by maintaining the porous fluororesin film at a temperature equal to or higher than 120° C. but lower than the melting point of the fluororesin in a state where the shape of the porous fluororesin film is not fixed.
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Classifications
PTFE, i.e. polytetrafluoroethylene {, e.g. ePTFE, i.e. expanded polytetrafluoroethylene} · CPC title
Homopolymers or copolymers of tetrafluoroethylene · CPC title
Thermal shrinking · CPC title
by stretching · CPC title
Mechanical properties, e.g. strength · CPC title
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- What does patent US9493619B2 cover?
- Provided is a method for producing a porous polytetrafluoroethylene film having good chemical resistance, good heat resistance, a high porosity, and good dimensional stability. The method for producing a porous polytetrafluoroethylene film includes a stretching step of stretching a sheet-like molded body composed of a fluororesin containing polytetrafluoroethylene as a main component in a longi…
- Who is the assignee on this patent?
- Sumitomo Electric Fine Polymer Inc
- What technology area does this patent fall under?
- Primary CPC classification C08J5/18. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 15 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).