Provided is a resin composition, a prepreg for a printed circuit and a metal-coated laminate. The resin composition includes: a silicone aryne resin, a polyphenylene ether resin with unsaturated bonds, and a butadiene polymer. The resin composition is used such that the prepared metal-coated laminate can have at least one of the following characteristics: a low dielectric loss factor, high heat resistance, and a low coefficient of thermal expansion.

Provided is a method for producing a cyclic polysilane compound simply and easily in a higher yield. The method for producing a cyclic polysilane compound according to an embodiment of the present invention comprising a reaction step of adding a silane monomer compound represented by Formula (I) below into a liquid mixture containing metallic sodium and a lithium salt and allowing them to react: ##STR00001##
where, R.sup.1 and R.sup.2 each independently represent a hydrogen atom, a hydrocarbon group, an alkoxy group, or a halogen atom, X.sup.1 and X.sup.2 each independently represent a halogen atom or an alkoxy group, and n.sub.1 is an integer that is greater than or equal to 1.

To provide a siliceous film manufacturing composition that can fill a narrow and a high aspect ratio trench and can produce a thick siliceous film. [Means for Solution] The present invention provides a siliceous film manufacturing composition that comprises, (a) a block copolymer having a linear and/or cyclic polysilane backbone block with or more silicon atoms and a polycarbosilane backbone block with or more silicon atoms, and (b) a solvent.

To provide a siliceous film manufacturing composition that can fill a narrow and a high aspect ratio trench and can produce a thick siliceous film. [Means for Solution] The present invention provides a siliceous film manufacturing composition that comprises, (a) a block copolymer having a linear and/or cyclic polysilane backbone block with or more silicon atoms and a polycarbosilane backbone block with or more silicon atoms, and (b) a solvent.

Disclosed is a modified preceramic polymer having a polymer backbone consisting of silicon or a combination of silicon and carbon; and a pendant modifier bonded to the backbone wherein the modifier includes silicon, boron, aluminum, a transition metal, a refractory metal, or a combination thereof. The modified preceramic polymer can be used to form a ceramic matrix composite.

Disclosed is a modified preceramic polymer having a polymer backbone consisting of silicon or a combination of silicon and carbon; and a pendant modifier bonded to the backbone wherein the modifier includes silicon, boron, aluminum, a transition metal, a refractory metal, or a combination thereof. The modified preceramic polymer can be used to form a ceramic matrix composite.

A method for producing a polycarbonate copolymer which has siloxane constituent units represented by any of formulae (1-1) to (1-4) and prescribed polycarbonate constituent units, the method having a polymerization step for polymerizing a silane-based compound selected from among a prescribed diaryloxysilane compound, a prescribed dialkoxysilane compound and a prescribed silicon compound, a carbonate compound and a diol compound such as an aromatic diol compound or an alicyclic diol compound in the presence of a transesterification catalyst. The polymerization step is carried out in a molten state under reduced pressure while removing alcohols derived from the carbonate compound.

##STR00001##

An energy-sensitive composition that yields a cured product with excellent crack resistance, a cured product of the composition, and a method of forming a cured product. The composition includes a polysilane and a thermal base generator, the thermal base generator including a compound represented by the following formula (b1),

##STR00001##

in which R.sup.b1 and R.sup.b2 each independently represents a halogen atom, a nitro group, an alkyl group, an aryl group, an arylalkyl group, or an alkoxy group, n1 represents an integer of 0 or more and 4 or less, n2 represents an integer of 0 or more and 3 or less, Z.sup.q+ represents a counter cation composed of an organic cation or a metal cation, and q represents an integer of 1 or more.

An energy-sensitive composition that yields a cured product with excellent crack resistance, a cured product of the composition, and a method of forming a cured product. The energy-sensitive composition includes a polysilane and a thermal base generator, in which the thermal base generator includes a compound represented by the following formula (b1):

##STR00001##

in which R.sup.b1 and R.sup.b2 each independently represents a hydrogen atom, a halogen atom, a nitro group, an alkyl group, an aryl group, an arylalkyl group, or an alkoxy group, R.sup.b3 represents a hydrogen atom or an alkyl group; n1 and n2 each independently represent an integer of 0 or more and 4 or less; Z.sup.q+ represents a q-valent organic cation composed of a base having a pKa of greater than 15; and q represents an integer of 1 or more.

An energy-sensitive composition that yields a cured product with excellent thermal resistance and crack resistance, a cured product of the composition, and a method of forming a cured product. The energy-sensitive composition includes a polysilane and a thermal base generator, in which the thermal base generator includes an ionic compound and a nonionic compound. An anion moiety in the ionic compound preferably includes at least one of an anion having an oxaxanthone skeleton, an anion having a ketoprofen skeleton, and an anion having a fluorenone skeleton.