Method for producing low-molecular-weight polytetrafluoroethylene
JPWO2023224043A5Active Publication Date: 2025-03-27DAIKIN INDUSTRIES LTD +2
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Patent Information
- Application Number
- JP2024521946
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-03-27
- Estimated Expiration
- 2043-05-16
AI Technical Summary
Technical Problem
Conventional methods for producing low molecular weight polytetrafluoroethylene (PTFE) result in significant variations in molecular weight due to uneven radiation absorption during irradiation, leading to inconsistent product quality.
Method used
Irradiating high molecular weight PTFE with a controlled dose rate ratio of 1.55 or less, using electron beams, gamma rays, or X-rays, and maintaining the irradiation in the absence of oxygen to achieve consistent low molecular weight PTFE production.
Benefits of technology
This method ensures a low molecular weight PTFE with minimal variations, enhancing its chemical stability and surface properties, suitable for applications in coatings, inks, and greases by maintaining a consistent molecular weight range.
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Abstract
The present invention provides a method for producing a low-molecular-weight polytetrafluoroethylene which has a small variation in the molecular weight. The present invention provides a method for producing a low-molecular-weight polytetrafluoroethylene, the method comprising a step (1) in which a low-molecular-weight polytetrafluoroethylene that has a melt viscosity of 1.0 × 102 Pa∙s to 7.0 × 105 Pa∙s at 380°C is obtained by irradiating a high-molecular-weight polytetrafluoroethylene with radiation such that the ratio (maximum dose) / (minimum dose) of the maximum dose to the minimum dose is 1.55 or less.
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