This organopolysiloxane composition, when cured at room temperature by moisture in the atmosphere, provides a silicone rubber cured product having good self-adhesiveness to a magnesium alloy. The organopolysiloxane composition contains (A) an organopolysiloxane having a hydroxy group and/or a hydrolysable silyl group at both ends of the molecular chain, (B) an organic silicon compound other than (A) and (C), having at least three hydrolysable groups bonded to a silicon atom per molecule, and/or a partial hydrolysis-condensation product thereof, and (C) a silane coupling agent having a specific molecular structure having a carboxylic acid silyl ester bond. Furthermore, a novel compound, having an alkoxysilyl group and a carboxylic acid silyl ester group per molecule, can have improved adhesiveness/bonding properties with respect to a base material due to the effect of carboxylic acid after hydrolysis thereof.

A resin composition including a silicon-containing resin component and a solvent, the silicon-containing resin component includes (I) mentioned below, the solvent including at least one of a terpene compound having at least one of a hydroxy group and an acetoxy group, and a cyclic skeleton-containing acetate compound (excluding the terpene compound): (I) a polysilane-polysiloxane resin having a polysilane structure and a polysiloxane structure.

A resin composition including a silicon-containing resin component and a solvent, the silicon-containing resin component includes (I) mentioned below, the solvent including at least one of a terpene compound having at least one of a hydroxy group and an acetoxy group, and a cyclic skeleton-containing acetate compound (excluding the terpene compound): (I) a polysilane-polysiloxane resin having a polysilane structure and a polysiloxane structure.

The present invention relates to new coating compositions for the preparation of functional surface coatings on various base material substrates. The coating compositions are based on a silazane-containing polymer and a non-polymeric phenolic compound comprising at least two and not more than four aromatic units in its molecular structure. The coating compositions provide improved physical and chemical surface properties and may be applied by user-friendly coating methods.

To provide a new silicon-containing polymer making it possible to form a cured film has features that its residual stress is small and crack resistance is high. A polycarbosilazane having particular cyclic structures.

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.

To provide an amorphous silicon forming composition, which has high affinity with a substrate, is excellent in filling properties, and is capable of forming a thick film. [Means for Solution] An amorphous silicon forming composition comprising: (a) a block copolymer comprising a linear and/or cyclic block A having a polysilane skeleton comprising 5 or more silicon and a block B having a polysilazane skeleton comprising 20 or more silicon, wherein at least one silicon in the block A and at least one silicon in the block B are connected by a single bond and/or a crosslinking group comprising silicon, and (b) a solvent.

The present invention provides a method for producing a novel amorphous silicon sacrifice film and an amorphous silicon forming composition capable of filling trenches having a high aspect ratio to form an amorphous silicon sacrifice film that is excellent in affinity with a substrate. A method for producing an amorphous silicon sacrifice film, comprising (i) polymerizing a cyclic polysilane comprising 5 or more silicon or a composition comprising the cyclic polysilane by light irradiation and/or heating to form a polymer having a polysilane skeleton, (ii) applying an amorphous silicon forming composition comprising said polymer having a polysilane skeleton, polysilazane and a solvent above a substrate to form a coating film, and (iii) heating the coating film in a non-oxidizing atmosphere.

Provided herein is a method for coating a surface. The method comprises providing a towelette moistened with a mixture of constituents to form a non-aqueous silicon-based composition comprising 7% to 80% (w/w of the total composition) polysilazane, 1% to 10% (w/w of the total composition) polysilane, 0.2% to 1% (w/w of the total composition) polysiloxane, and 20% to 70% (w/w of the total composition) at least one organic solvent; wherein polysilazane is present in a 10:1 to 110:1 weight ratio to polysiloxane; and wherein the polysilane is of a formula (R.sub.1R.sub.2Si).sub.n, wherein n is greater than 1, and wherein R.sub.1 and R.sub.2 are the same or different and are chosen from alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl. The mixture from the towelette to form a coating on a surface and the coating is cured ambiently without additional heat. Also provided are towelettes containing the mixture.