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US4950728A Thermally stable (imide/amide)/(urea/siloxane) block copolymers 失效
热稳定(酰亚胺/酰胺)/(脲/硅氧烷)嵌段共聚物

Thermally stable (imide/amide)/(urea/siloxane) block copolymers
摘要:
Thermally stable block copolymers, well adapted for the production of coating films, include recurring imide/amide blocks of the formula: ##STR1## and recurring urea/siloxane blocks of the formula:--NH--CO--NH--A--NH--CO--NH-- (II)wherein A is a divalent diorganosiloxane radical of the formula ##STR2##
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