Dow Corning Corporation

Other

Zhongtao Li

Bizhong Zhu

Frederick J McGarry

Dimitris Elias Katsoulis

John Robert Keryk

Duane R Bujalski

Kai Su

Ronald Paul Boisvert

Brian Harkness

Bianxiao Zhong

Kermit S Kwan

Debora F Bergstrom

Bihn Thanh Nguyen

A silicone resin containing boron, aluminum, and/or titanium, and having silicon-bonded branched alkoxy groups; a silicone composition containing a silicone resin; and a method of preparing a coated substrate comprising applying a silicone composition on a substrate to form a film and pyrolyzing the silicone resin of the film.

Silicone resin and silicone composition

Herein is disclosed a resin solution, comprising (a) about 0.1 solids wt % to about 50 solids wt % of an organosiloxane resin comprising the formula (RSiO ) (R&prime;SiO ) , wherein R is selected from the group consisting of C -C alkyl, C -C alkenyl, C -C alkoxy, C -C alkenoxy, and C -C substituted hydrocarbon; R&prime; is selected from the group consisting of &mdash;H, C -C unsubstituted hydrocarbon, and C -C substituted hydrocarbon; x is from about 5 mole % to about 75 mole %; y is from about 10 mole % to about 95 mole %; and x&plus;y is at least about 40 mole %; and (b) about 50 solids wt % to about 99.9 solids wt % of a resin comprising at least about 90 mole % of the formula HSiO . Also disclosed herein is a method of preparing such a resin solution, as well as a method of preparing a solid coating, comprising (i) coating the resin solution on a surface; (ii) removing the solvent from the resin solution; (iii) removing R groups from the organosiloxane resin; and (iv) curing the resin solution, to form the solid coating. Coatings prepared from the resins disclosed herein have relatively low dielectric constants and also have relatively low SiH content and relatively high modulus.

Hydrosilsesquioxane resin compositions having improved thin film properties

A hydrosilylation reaction curable composition that includes a silsesquioxane polymer, a mixture of silanes or siloxanes as a cross-linking compound and a hydrosilylation reaction catalyst. The curable composition is cured to form a cured resin having high fracture toughness and strength without the loss of elastic modulus.

High fracture toughness hydrosilyation cured silicone resin

A hydrosilylation reaction curable composition including a silsesquioxane polymer, a cross-linking compound, a hydrosilylation reaction catalyst and colloidal silica having a surface coating formed thereon. The curable composition is cured to form a cured resin having high fracture toughness and strength without the loss of elastic modulus and glass transition temperature.

Hydrosilyation cured silicone resin containing colloidal silica and a process for producing the same

A process for producing a cured silsesquioxane resin. The process includes fractionating the silsesquioxane resin a plurality of times utilizing an organic solvent in combination with an organic non-solvent. The fractionated resin is then stripped of excess solvent. The stripped resin is then mixed with a cross-linking compound to form a curable composition. The curable composition is cured to form a cured resin having high fracture toughness and strength without the loss of elastic modulus.

Hydrosilyation cured silicone resins obtained by fractionation

A cured silsesquioxane resin and method for its preparation are disclosed. By using a silyl-terminated hydrocarbon in the hydrosilylation reaction curable composition used to prepare the cured silsesquioxane resin, the cured silsesquioxane resin has improved strength and toughness without significant loss of modulus. A typical silyl-terminated hydrocarbon useful in this invention is silphenylene.

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Midland, MI, United States of America

Zhongtao Li