SiH-functional polyimide resin
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorHisataka Nakashima
Life of this patent
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Abstract
A polyimide resin having excellent storage stability which cures to give a highly adherent, highly heat-resistant, and highly moisture-resistant film is disclosed, said resin being prepared by reacting (A) a tetracarboxylic dianhydride and (B) a diamino-functional siloxane compound having the general formula ##STR1## in which each R.sup.1 is independently selected from C.sub.1 to C.sub.20 monovalent hydrocarbon radicals, each R.sup.2 is independently selected from C.sub.1 to C.sub.20 divalent hydrocarbon radicals, R.sup.3 is selected from the group consisting of hydrogen and --SiR.sup.1.sub.3 wherein R.sup.1 is defined as above, a is an integer from 1 to 20, b is an integer from 1 to 20, c is an integer from 0 to 20, and d is an integer from 1 to 20.
Claims16
A polyimide resin prepared by reacting
- (A) a tetracarboxylic dianhydride and
- (B) a diamino-functional siloxane compound having the general formula ##STR15## in which each R.sup.1 is independently selected from C.sub.1 to C.sub.20 monovalent hydrocarbon radicals, each R.sup.2 is independently selected from C.sub.1 to C.sub.20 divalent hydrocarbon radicals, R.sup.3 is selected from the group consisting of hydrogen and --SiR.sup.1.sup.3 wherein R.sup.1 is defined as above, a is an integer from 1 to 20, b is an integer from 1 to 20, c is an integer from 0 to 20, and d is an integer from 1 to 20.
A method for preparing a polyimide resin comprising:
- (I) reacting
- (A) a tetracarboxylic dianhydride and
- (B) a diamino-functional siloxane compound having the general formula ##STR18## in which each R.sup.1 is independently selected from C.sub.1 to C.sub.20 monovalent hydrocarbon radicals, each R.sup.2 is independently selected from C.sub.1 to C.sub.20 divalent hydrocarbon radicals, R.sup.3 is selected from the group consisting of hydrogen and --SiR.sup.1.sub.3 wherein R.sup.1 is defined as above, a is an integer from 1 to 20, b is an integer from 1 to 20, c is an integer from 0 to 20, and d is an integer from 1 to 20, wherein said component (A) and said component (B) is reacted in a molar ratio of 1:0.05 to 1:1.5, thereby forming a polyamic acid;
- and (II) reacting the polyamic acid from step (I) to form a polyimide.
Dependencies are inferred from the claim text.