A highly dielectric addition type curable composition is provided comprising (A) an organopolysiloxane containing a cyanoalkyl group and a monovalent hydrocarbon group having an aliphatic unsaturated bond, (B) an organohydrogenpolysiloxane containing a cyanoalkyl group, and (C) a platinum group metal catalyst. The composition is easy to handle because of liquid despite solvent-free, less hygroscopic and effectively curable, and has a film-forming ability. The cured composition has excellent diel...

A dispersion comprises at least 30 per cent by weight of particles of a metal oxide having an average primary particle size of less than 200 nm dispersed in a siloxane fluid dispersing medium and a dispersing agent wherein said metal oxide particles are hydrophoobic, and the dispersing agent is polylkylene oxide/polyalkylsiloxane block copolymer comprising at least 30 per cent by weight of the copolymer of polyalkylsiloxane. The dispersion is particularly suitable for use as an ingredient in sun...

Method is provided for controlling the stereo chemistry of functionalities or X groups to exo or endo positions on a polyhedral oligomeric silsesquioxane (POSS) compound by adding certain reagents to said X groups to change one or more positions thereof to endo or exo. Also provided are the POSS species formed by the above inventive method. Method is also provided for inserting a ring substituent into a POSS compound. Also provided are the POSS species formed by such inventive method.

A water repellent silicone coating agent composition comprising (A) a diorganopolysiloxane having a viscosity of 20 to 20,000 mPa.multidot.s at 25.degree. C. in which the terminal ends of the molecular chain are blocked by silanol groups or silicon-bonded hydrolyzable groups, (B) a cross-linking agent represented by general formula R.sub.a SiX.sub.4-a, in which R is a monovalent hydrocarbon group comprising 1 to 10 carbon atoms, X is a hydrolyzable group, and subscript a is an integer of 0 to 2,...

A polyimide silicone resin composition comprising a polyimide silicone resin having recurring units of formula (1), a (meth)acrylic compound, and a polymerization initiator has fluidity at 25.degree. C. despite the substantially absence of a solvent. In formula (1), X is a tetravalent organic group, Y is a divalent organic group, Z is a divalent organic group having an organosiloxane structure, p and q are positive numbers. The composition using the reactive (meth)acrylic compound as a diluent f...

A coating composition comprising the reaction product of a benzotriazole compound having a polymerizable vinyl group and a hydroxyl group with a silane compound and/or a (partial) hydrolyzate thereof is applied to plastic substrates, typically polycarbonate resin substrates to form transparent coatings having improved mar, weather and chemical resistance.

Disclosed herein are siloxane-based resins prepared by hydrolyzing and polycondensing cyclic and/or cage-shape siloxane compounds, optionally with at least one silane compound, in an organic solvent in the presence of a catalyst and water. Also, disclosed herein are methods for forming insulating film between interconnect layers in semiconductor devices by using the siloxane-based resins thus prepared as low dielectric insulating materials.

A method for preparing a thermoplastic elastomer is disclosed, said method comprising (I) mixing (A) a rheologically stable polyamide resin having a melting point or glass transition temperature of 25.degree. C. to 275.degree. C., (B) a silicone base comprising (B') 100 parts by weight of a diorganopolysiloxane gum having a plasticity of at least 30 and having an average of at least 2 alkenyl groups in its molecule and (B") 5 to 200 parts by weight of a reinforcing filler, the weight ratio of sa...

Coatings composed of (A) a copolymer prepared by copolymerizing (1) a silicone macromer having a double bond at one end of the molecule, (2) an unsaturated monomer having on the molecule both a carboxyl or acid anhydride group and a double bond, (3) an unsaturated silane monomer having on the molecule both a hydrolyzable silyl group and a double bond, (4) an unsaturated monomer having on the molecule both an amide, imide, carbamate or urea group and a double bond and, optionally, (5) another cop...

The present invention provides a process for preparing a filled halobutyl elastomer, which comprises mixing a halobutyl elastomer, mineral filler and a silazane compound or mixture of a silazane compound and an additive which contains at least one hydroxyl group and at least one substituents which bears a basic amine group, and curing the filled elastomer with sulfur or other curative systems. The present invention has the advantages of (a) not evolving alcohol either during the manufacture or s...