METHOD OF RETURNING CROSSLINKING SITE OF CROSSLINKED ELASTOMER TO NON-CROSSLINKED STATE
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United States of America Patent
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Issued Date -
Sep 12, 2024
app pub date -
Jun 30, 2022
filing date -
Aug 5, 2021
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Abstract
Provided is a method by which a crosslinking site of a crosslinked elastomer can easily be returned to a non-crosslinked state. The method of returning a crosslinking site of a crosslinked elastomer to a non-crosslinked state includes a step of causing contact of a crosslinked elastomer including a diboronic acid ester skeleton unit represented by a specific general formula (1) at a crosslinking site with a monoboronic acid compound represented by a specific general formula (3) in the presence of an organic solvent having an SP value (solubility parameter) of not less than 7 (cal/cm3)1/2 and not more than 10 (cal/cm3)1/2. In this step, a molar abundance ratio of the monoboronic acid compound relative to the diboronic acid ester skeleton unit (monoboronic acid compound/diboronic acid ester skeleton unit) is set as more than 2 and not more than 5.
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