Solution or Suspension Containing Fluoropolymer, Method for Producing Same, and Use Thereof for Producing Piezoelectric and Pyroelectric Coatings
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United States of America Patent
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Issued Date -
Jun 20, 2013
app pub date -
Aug 12, 2011
filing date -
Aug 27, 2010
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Abandoned
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Abstract
The invention relates to a method for producing a homogenous solution of a fluoropolymer, selected from fluoropolymers and fluoro-copolymers and mixtures of various fluoro-homopolymers and/or fluoro-copolymers in a high boiling solvent, whereby (a) the fluoropolymer to be dissolved is dissolved in a mixture of at least two solvents, the first comprising a boiling point of less than 150° C., and/or a vapor pressure of over 5 hPa (at 20° C.), and the second being a high boiling solvent comprising a boiling point at least 50 K higher than the first solvent and/or the boiling point thereof being selected so that the solvent mixture comprises a separation factor α of ≧1, and subsequently (b) the first solvent is substantially or completely removed from the mixture. The invention further relates to a method for producing suspensions of inorganic particles of a piezoelectrically and pyroelectrically active or activatable oxide in such fluoropolymer solutions and to the product of said method. The colorless fluoropolymer solutions and opaque white suspensions are suitable for producing laminar piezoelectric and pyroelectric coatings, in particular using doctor blade or screen printing methods.
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