Method of making diglyme soluble siloxane-imide copolymers
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United States of America Patent
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Oct 20, 1987
Grant Date -
N/A
app pub date -
Oct 19, 1984
filing date -
Oct 19, 1984
priority date (Note) -
Expired
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Abstract
There is provided a process for making diglyme soluble siloxane-imide copolymers consisting essentially of (a) heating a mixture of diglyme, azeotropic solvent, organic diamine and bis-aminoalkyl-terminated polydiorganosiloxane to reflux and (b) adding to the refluxing mixture of (a) an organic dianhydride of the formula ##STR1## where Ar is an aromatic or aromatic containing group and Y is oxygen or sulfur. Block copolymers are obtained if the bis-aminoalkyl-terminated polydiorganosiloxane is not added to the reaction mass until after the reaction of the organic diamine and organic dianhydride has been completed.
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