Patent ID: 7122591

Claim:
A polyphenylene ether-based resin composition comprising a polyphenylene ether-based resin and at least one member selected from the group consisting of a cage silsesquioxane and a partially cleaved structure of a cage silsesquioxane; wherein the cage silsesquioxane is a compound represented by the general formula (A) and the partially cleaved structure of the cage silsesquioxane is a compound represented by the general formula (B): [RSiO 3/2 ] n (A) (RSiO 3/2 ) l (RXSiO) k (B) wherein, in the general formulae (A) and (B), R is selected from a hydrogen atom, an alkoxyl group having 1 to 6 carbon atoms, an aryloxy group, a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, and a silicon atom-containing group having 1 to 10 silicon atoms, and a plurality of R's may be the same or different; in the general formula (B), X is a group selected from OR 1 (R 1 is a hydrogen atom, an alkyl group, an aryl group, a quaternary ammonium radical), halogen atom and groups defined in the above R, and a plurality of X's may be the same or different or a plurality of X's in (RXSiO) k may be connected to each other to form a connected structure; and n is an integer of 6 to 14, l is an integer of 2 to 12, and k is 2 or 3; and wherein the connected structure in the general formula (B) is a connected structure represented by the general formula (1): wherein Y and Z are selected from the group consisting of the same groups as those for X, and Y and Z may be the same or different.