SILOXANE POLYMER, SILOXANE POLYMER COMPOSITION, AND MOLDED ARTICLE
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United States of America Patent
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Sep 21, 2023
app pub date -
Jul 29, 2021
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Aug 6, 2020
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A siloxane polymer contains a silsesquioxane unit and a linear siloxane unit in its main chain and has a cage-type silsesquioxane structure in its side chain. A highly transparent and flexible film having a small linear thermal expansion coefficient is produced by utilizing the cohesion force (physical crosslinking) of the cage-type silsesquioxane in the side chain. The siloxane polymer has repeating units respectively represented by formulae (1) and (4), and has terminal groups respectively represented by formulae (5L) and (5R) at its right and left terminals, wherein A represents a structure shown below.
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