| 摘要 |
PURPOSE:The title copolymer excellent in low-temperature flexibility, hydrolysis resistance, heat resistance, water absorption resistance, etc., obtained by polymerizing an aromatic dicarboxylic acid component, a diol component and a specified polyorganosiloxane component via esterification. CONSTITUTION:An aromatic dicarboxylic acid such as phthalic acid of formula I or its (1-4C) alkyl ester is reacted by heating or polycondensed with a diol component of formula II (wherein R'' is a lower alkylene) and a polyorganosiloxane diol of formula III (wherein l is 2-25, m is 1-6, Q is O or a valence bond, R' is H, CH3 or phenyl and R is a bivalent organic group) at 170-280 deg.C in the presence of an esterification catalyst (e.g., tetraalkyl titan ate) in a stream of normal-pressure inert gas, then in a vacuum of 10-15mmHg, and finally in a high vacuum to obtain the title copolymer comprising 40-99wt% units of formula IV and 60-1wt% units of formula V and having a J-value of 10-300ml/g.
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