Patent ID: 7816437

Claim:
A polyimide resin composition modified with bismalemide and cyanate, which comprises (a) polyimide resin, (b) cyanate, (c) bismaleimide, and (d) nanometer filler, wherein (a) polyimide resin is contained in an amount of from 75 to 80% by weight, (b) cyanate is contained in an amount of 0.1 to 10% by weight, (c) bismaleimide is contained in an amount of 0.1 to 10% by weight, and (d) nanometer filler is contained in an amount of 1 to 40% by weight, all based on the total weight of the composition; wherein the polyimide resin (a) is obtained from reacting a diamine represented by the formula (I): H 2 N—R 1 —NH 2 (I) wherein R 1 represents (i) a direct bond; (ii) C 2-12 aliphatic divalent group; (iii) C 4-30 alicyclic divalent group; (iv) C 6-30 aromatic divalent group; (v) a group of the formula —Ph—O—R 2 —O—Ph— (wherein R 2 represents a phenylene group (—Ph—) or a group of the formula —Ph—X—Ph— in which X represents a direct bond, a C1-4 alkylene group which may be substituted with halogen, a group of —O—Ph—O—, —O—, —CO—, —S—, —SO—, or —SO 2 —); or (v) a group of the formula —R 3 —(SiR 4 2 —O) m SiR 4 2 —R 3 — (wherein R 3 represents —(CH 2 ) s —, —(CH 2 ) s —Ph—, —(CH 2 ) s —O—Ph— or —Ph—, in which s represents an integer number of from 1 to 4); R 4 represents a C 1-6 alkyl group, a phenyl group, or a C 1-6 alkylphenyl; and m represents an integer number of from 1 to 100; with a dianhydride represented by formula (II): wherein Y is a aliphatic tetravalent group containing 2 to 12 carbon atoms; a cycloaliphatic tetravalent group containing 4 to 8 carbon atoms; tetravalent monocyclic or polycyclic C 6-14 aryl; a group of the formula >Ph—X—Ph< wherein X represents a direct bond, C 1-4 alkylene which may be substituted with a halogen(s), —O—Ph—O—, —O—, —CO—, —S—, —SO—, or —SO 2 —; the cyanate (b) is represented by the following formula (III): R 5 O—C≡N) n (III) wherein n is a number of at least 2 and not more than 5, and R 5 may be: (i) residues having a valence of at least 2 and derived from C 6-16 aromatic hydrocarbon; (ii) organic groups represented by the following formula (1): wherein o is zero (0) or one (1) and R 6 is a divalent aliphatic, aromatic or araliphatic hydrocarbon group, an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group, a sulfinyl group, an alkyleneoxyalkylene group, an imino group; (iii) groups derived from novolac-type phenol resins; and the bismaleimide (c) is represented by the following formula (IV): wherein R 7 is (i) divalent aromatic or aliphatic organic group containing 6 to 16 carbon atoms, and (ii) organic group represented by the following formula (1): wherein o is zero (0) or one (1) and R 6 is a divalent aliphatic, aromatic or araliphatic hydrocarbon group, an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group, a sulfinyl group, an alkyleneoxyalkylene group, an imino group, (iii) groups derived from novolac-type phenol resins.