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Narrow-arranged poly-phosphinodifluoro-ethylene reversible and electrocontrollable transparent film, its making mehtod, product and composition therefrom

A technology of polyvinylidene fluoride and vinylidene fluoride, which is applied in the field of reversible and electrically controllable light-transmitting films, and can solve problems such as low solubility and lack of

Inactive Publication Date: 2002-05-22
ATOCHEM OF NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] While various references disclose the use of polyvinylidene fluoride in the manufacture of RECLT devices, these commercial grade resins do not possess the low solubility, high thermal stability, and strength, or are required for the manufacture of high quality RECLT devices, especially electrochromic devices. required optical clarity

Method used

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  • Narrow-arranged poly-phosphinodifluoro-ethylene reversible and electrocontrollable transparent film, its making mehtod, product and composition therefrom
  • Narrow-arranged poly-phosphinodifluoro-ethylene reversible and electrocontrollable transparent film, its making mehtod, product and composition therefrom
  • Narrow-arranged poly-phosphinodifluoro-ethylene reversible and electrocontrollable transparent film, its making mehtod, product and composition therefrom

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Experimental program
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preparation example Construction

[0087] In preparation for NMR analysis, VDF / HFP copolymer samples were dissolved in 5 mm diameter NMR tubes. Samples with HFP less than 10 wt% were dissolved in DSMO-d6 at 80°C, while samples with HFP greater than 10 wt% were dissolved in acetone-d6 at 50°C. A quantity of 2-4 mg of polymer is placed in a test tube and enough solvent is added to fill the test tube to 5.5 cm (approximately 0.75 mL of solvent). A heating element is used to warm the sample. Samples were heated continuously for at least 1 hr until the solids were dissolved and no colloids were present, but in the case of DMSO-d6 no longer than 8 hrs to avoid degradation. Then invert the tube to check for colloids.

[0088] Spectra were acquired on a Bruker DMX or Varian Mercury 300 spectrometer at 80°C in the case of DMSO-d6 or 50°C in the case of acetone-d6 solvent. The determined parameters of the instrument are as follows:

[0089] Bruker DMX Varian Mercury 300

[0090] ″F signal freque...

Embodiment 1

[0138] 10% by weight of KYNAR FLEX2801 solution (broad distribution VF containing about 10% by weight of HFP on average 2 - HFP (vinylidene fluoride-hexafluoropropylene) copolymer), dissolved in n-methylpyrrolidone at 60° C. for 1 hour. The solution was then poured onto the glass and dried in a conventional oven at 165°C for 30 minutes. The resulting dry film was about 15 microns thick. Peel off from the substrate and measure its transmittance with a BYK-Gardner haze-gard plus instrument. The transmittance was found to be 94.9%.

Embodiment 2

[0140] A narrow composition distribution VF containing about 7% by weight HFP on average 2 - A 10% by weight solution of the HFP copolymer (copolymer 1) was dissolved in n-methylpyrrolidone at 60° C. for 1 hour. The solution was then poured onto the glass and dried in a conventional oven at 165°C for 30 minutes. The resulting dry film was about 15 microns thick. Peel off from the substrate and measure its transmittance with a BYK-Gardner haze-gard plus instrument. The transmittance was found to be 97.8%.

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Abstract

The disclosure relates to a reversible, electrically controllable light transmission (RECLT) film, article of manufacture composition, process and product produced by the process, comprising a conductive narrow composition distribution polyvinylidene fluoride copolymer in combination with an electrolyte and an RECLT material. The narrow composition distribution polyvinylidene fluoride copolymer has low solubility, high thermal stability and strength, and very high optical clarity. The polyvinylidene fluoride copolymer comprises a nonporous or porous copolymer of vinylidene fluoride preferably with either hexafluoropropylene or tetrafluoroethylene or chlorotrifluoroethylene, or vinyl acetate, or combinations thereof. The RECLT material includes organic or inorganic compounds known in the art. Typical RECLT materials include electrochromic materials, reversible metal electrodeposition materials, liquid crystal materials and dispersed particle materials.

Description

field of invention [0001] The present invention relates to a reversible electrically controllable light transmission (RECLT) film, a finished product, a composition and a method of making the same. Electrochromic, reversible metal electrodeposition, liquid crystal and dispersed particle system displays contain some RECLT phenomena. [0002] Electrochromic materials change color by inducing an electrochemical reaction by applying an electric current through the material. Unlike reversible metal electrodeposition compositions and dimming methods, electrochromic methods do not require electrodeposition to produce dimming effects. Reversible metal electrodeposition for dimming relies on deposition and demetallization on substrates to control light transmission. In contrast, liquid crystal systems switch between transmissive and non-transmissive light-scattering states by applying an electric current, but require considerable voltages to maintain light transmittance. [0003] An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B32B7/02B32B27/30C09K11/06G02B5/30G02F1/1334G02F1/1516
CPCG02F1/1334G02F1/15G02F1/172C09K11/06G02F1/1508G02F1/1525Y10T428/261G02F1/1516C09K2323/0271C09K2323/04C09K2323/02
Inventor M·T·伯奇尔M·M·德斯波托波罗
Owner ATOCHEM OF NORTH AMERICA INC
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